Available online wwwjocprcom Journal of Chemical and Pharmaceutical Research, 2015, 7(8):885-896 Research Article ISSN : 0975-7384 CODEN(USA) : JCPRC5 Excess parameters of binary liquid mixtures of ethyl benzoate with o-xylene, p-xylene and o-chlorotoulene at different temperatures G Lakshmana Rao, P B Sandhya Sri, G R Satyanarayana, K A K Raj Kumar and C Rambabu * Department of Chemistry, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India ABSTRACT Densities, ultrasonic velocities and viscosities of binary liquid mixtures of ethyl benzoate with o-xylene(ox), p- xylene(px) and o-chlorotoulene(oct) have been measured at,, and temperatures over the entire composition range of mole fractions These components are selected to study the effect of substituent and effect of certain positions on different thermodynamic parameters of the mixtures Using these experimental values, excess molar volume (V E ), deviation in adiabatic compressibility (Δβ ad ), excess free length(l f E ) and deviation in viscosities(δη) are calculated These excess parameters are fitted to Redlich-Kister type polynomial equation The values of parameters obtained are calculated along with the standard deviation (σ) Key words: Densities, ultrasonic velocities, viscosities, excess molar volume, deviation in adiabatic compressibility, excess free length and deviation in viscosity and molecular interaction INTRODUCTION The knowledge of physical and chemical properties of non-aqueous binary liquid mixtures has relevance in theoretical and applied areas of research The binary mixtures of aromatic hydrocarbons are very useful because they find many applications in the studies of preferential interaction of polymers and polymer phase diagrams and in mixed solvents [1, 2] Esters are one of the special kinds of chemicals with sweet odor and less toxic nature They have many industrial applications in perfumes, cosmetics etc Aromatic hydrocarbons like xylenes are frequently used as octane enhancers in vehicle fuels Hence it is very interesting to study the effect of xylenes on the physical and chemical properties of ethyl benzoate by mixing them in different proportions at different temperatures The excess properties of binary liquid mixtures have proved to be very useful indicator of the existence of significant effects resulting from intermolecular interactions [3, 4] The advantage of in-depth and wide study of this inter-relationship is twofold: first, it provides experimental background to develop, test and improve thermo dynamical models for calculating and predicting fluid phase equilibria; second, it offers a wide range of possibilities for continuous adjustment of physical properties of a given solvent [5] The detailed survey of literature indicated that some work regarding determination of excess parameters of xylenes has been done with different combinations at different temperatures But with ethyl benzoate combination, this type of work has been done at only 30315 and temperatures and also not found with ultrasonic studies With a view to understand the nature of interactions between ethylbonzoate and xylenes by taking the ultrasonic velocities 885
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 into consideration and its related parameters, We selected this sytem for our study As mentioned earlier, ethyl benzoate has several industrial applications and xylenes are also aromatic compounds o-chlorotoulene is similar compound but with a difference in one substitute Because of these aspects, We chose two xylenes and o- chlorotoulene for comparative study of molecular interactions with ethyl benzoate Experimental techniques and materials used Ethyl benzoate, o-cresol, p-cresol and o-chlorotoulene obtained from Merck were purified as described in the literature [6, 7] The purity of the samples was checked by comparing the measured densities with those reported in the literature [8-11] and these are given in Table 1 The density was measured with a pycnometer having a bulb volume of about 25 cm 3 and an internal capillary diameter of about 1 mm The density was then determined from the mass of the sample and the volume of pycnometer is used to determine the density Uncertainties in density measurements were estimated to be within ± 00001 g cm -3 The viscosity was measured using a commercial Ubbelohde capillary viscometer of 055 mm diameter calibrated with double distilled water at temperatures of 30315, 30815, 31315 and Table-1: Comparison of experimental densities (ρ), viscosities (η) and velocities (U) with literature values at,, and Liquid Density10-3 (kgm -3 ) Viscosity (mpa s) Velocity (m s -1 ) Exp Lit Exp Lit Exp Lit Ethyl benzoate (EB) 30315 K 10392 1042 a 17512 17495 a 13462 13454 a o-xylene (OXL) 30315 K 08705 08707 b 0728 0705 c 13362 113875 b p-xylene (PXL) 30315 K 08528 08528 b 0579 05782 c 12863 128843 b o-chlorotoluene (OCT) 30315 K 10728 10725 d 0870 0885 d 12838 12838 d a Ref [8], b Ref [9], c Ref [10], d Ref [11] Theoretical Considerations: Assuming that ultrasonic absorption is negligible, adiabatic compressibilities can be obtained from the densities and ultrasonic sound velocities using the relation β ad = (ρu 2 ) -1 (2) The molar volumes of the binary mixtures were calculated using the equation V = ( M 1 +X 2 M 2 ) / ρ (3) Intermolecular free length (L f ) has been evaluated by Jacobson s formula L f = K/ uρ 1/2 (4) where K is the temperature dependent Jacobson constant and T is the absolute temperature The strength of interaction between the component molecules of binary mixtures is well reflected in the deviation of the excess functions from ideality Thermodynamic excess functions are found to be very sensitive towards mutual interactions between component molecules of liquid mixtures The sign and extent of deviation of these functions from ideality depends on the strength of interaction between unlike molecules The excess properties such as β ad,, V E E, η and L f have been calculated using the equation Y E = Y mix - ( Y 1 +X 2 Y 2 ) (5) where Y E is β ad or V E or η or L f E, and X represent mole fraction of the component and subscripts 1 and 2 stand for the components1and 2 These excess functions were fitted to Redlich - Kister type polynomial equation [12] Y cal E = X 2 Σ a j-1 (X 2 - ) j-1 (6) The values of coefficient a j-1 evaluated by the method of least squares with all points weighed equally with the standard deviations are listed in Table 3 and are calculated as σ (Y E ) = (Y ob E -Y cal E )/ (m-n )) ½ (7) 886
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 where m is the number of experimental data points and n is the number of coefficients considered ( n = 5 in the present calculation) RESULTS AND DISCUSSION Computed values of V E, β ad, L f E, and η along with the experimental values of U, ρ and η are presented in the Tables 2-4 Variations of excess parameters with the mole fraction of EB are represented in the figures 1(a) 3(d) The sign of V E of a system depends upon the relative magnitude of expansion and contraction of the two liquids due to mixing [12] The factors that are responsible for expansion of volume on mixing of the components are: (1) Steric hindrance due to branching of chains (2) Formation of weaker solute-solvent bond than solute-solute and solvent-solvent bonds and (3)Dissociation of one component or all components The factors that lead to contraction in volume on mixing are: (a) Strong specific interaction usually a kind of chemical interaction (b)strong physical interaction such as dipole-dipole or dipole-induced dipole interactions(c) Occupation of void spaces of one component by the other may be due to when the molecular sizes of the components differ by a large magnitude The sign and magnitude of excess molar volume would depend on the relative magnitude of contractive and expansive effect which arises on mixing of liquid components The negative deviations in excess molar volume (V E ) are observed for these three systems These are caused by some strong interactions between unlike molecules In EB molecules two polar bonds viz >C=O, C-O-C bonds are present But there is no scope for either of the hydrogen bonding between EB molecules There are two +I (methyl ) groups on in xylenes and one +I (methyl ) group and one weak I ( Cl ) in o-chlorotoulene molecules Due to presence of +I (methyl) groups, xylene molecules are induced with partial charges (Though para xylene dipole moment is zero) This facilitates for dipole induced dipole interactions between EB molecules and xylene molecules But in case of o- xylene molecules, the presence of two methyl groups on adjacent positions hinders the approachment (steric hindrance) of other molecules (EB) towards them Hence weak interaction than in case of p-xylene molecules is possible The same trend is observed in the present study Also the same trend was reported by Anil Kumar Nain etal [14] and Nandibatla V Sasty etal [13] The observations are again supported by the trends observed for excess acoustic impedance (Z E ) and excess ultrasonic velocity (U E ) The π-electron density in derivatives of benzene ring depends upon the group that is attached to it There may be some n π interactions between the pair of electrons on carbonyl oxygen of ester and π electron clouds of benzene ring in p-xylene and ortho chlorotoulene molecules This was supported by CYang, WXu, and PMa [15] In case of ortho chlorotoulene molecules, one strong +I (methyl) group and one weak I (Cl) group are present on benzene ring at adjacent positions Hence less polarization is observed So weak interactions between orthochlorotoulene molecules and EB molecules are expected The same is observed in the present study For this system a little deviation is observed in all parameters This can be explained by the following aspects Almost similar sizes of EB and OCT molecules According to Fort and Moore [16] molecules with equal size do not mix thoroughly Due to the presence of one +I and one I, there is a little possibility for OCT molecules to be polarised Hence very weak associative forces may be present In general, the deviation [17] in adiabatic compressibility can be explained by taking into consideration of the following factors:2 (a) Loss of dipolar association and difference in size and shape of component molecules which lead to decrease in velocity and increase in compressibility (b) Dipole-Dipole interaction or hydrogen bonded complex formation between unlike molecules which lead to increase in sound velocity and decrease of compressibility 887
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 TABLE-2 System-I : Ethylbenzoate() + o-xylene(x 2) Ultrasonic velocities, Densities, Viscosities and related excess parameters Mole fraction 00857 01742 02656 03601 04577 05587 06632 07715 08837 10000 00857 01742 02656 03601 04577 05587 06632 07715 08837 10000 00857 01742 02656 03601 04577 05587 06632 07715 08837 10000 00857 01742 02656 03601 04577 05587 06632 07715 08837 10000 Velocity U m/s 13362 13384 13403 13418 13430 13440 13448 13454 13458 13461 13462 13121 13146 13172 13195 13217 13236 13254 13272 13288 13302 13319 12932 12958 12983 13008 13032 13055 13077 13098 13118 13138 13160 12732 12757 12784 12810 12836 12862 12888 12913 12938 12964 12990 Density ρ( kg/m 3 ) 8705 8890 9074 9255 9433 9607 9776 9941 10099 10249 10392 8694 8879 9061 9240 9415 9586 9754 9915 10069 10212 10348 8677 8864 9046 9222 9397 9566 9730 9887 10036 10174 10306 8658 8845 9025 9201 9373 9540 9700 9854 10001 10136 10260 Viscosity η cp V E cm 3 mol -1 Δβ ad 10-12 0728 0808 0892 0980 1072 1170 1275 1384 1500 1623 1751 0656 0726 0801 0881 0965 1055 1150 1252 1360 1475 1596 0620 0681 0746 0816 0891 0971 1056 1147 1244 1347 1455 0588 0641 0699 0762 0829 0901 0977 1059 1147 1241 1343-02272 -04384-06069 -07336-08055 -08093-07589 -06127-03558 -02677-04929 -06767-08063 -08824-09190 -08613-07086 -04039-03276 -05852-07606 -09241-10073 -10244-09475 -07620-04238 -03627-06279 -08396-09987 -10921-10923 -10128-08387 -04979 m 2 N -1-00973 -01780-02410 -02838-03023 -02951-02649 -02066-01166 -01106-01907 -02530-02904 -03093-03066 -02730-02146 -01254-01190 -02099-02693 -03114-03268 -03187-02841 -02221-01261 -01286-02177 -02837-03248 -03402-03273 -02915-02291 -01302 E L f (Ǻ) -00019-00036 -00049-00058 -00062-00061 -00055-00043 -00024-00023 -00040-00053 -00062-00066 -00066-00059 -00047-00027 -00026-00045 -00058-00068 -00072-00070 -00063-00050 -00028-00028 -00048-00063 -00073-00076 -00074-00066 -00052-00030 η cp -00080-00140 -00200-00240 -00260-00250 -00220-00170 -00090-00110 -00190-00250 -00290-00310 -00310-00270 -00210-00120 -00110-00190 -00260-00300 -00310-00310 -00270-00200 -00110-00120 -00210-00270 -00310-00330 -00330-00300 -00230-00140 The strength of the interaction between the components increases/decreases when excess values tend to become increasingly negative/decreasingly positive This may be qualitatively explained in terms of closer approach of unlike molecules leading to reductions in compressibility and volume The negative L f E values indicate that sound wave has to travel a shorter distance It is due to dominant nature of interactions between unlike molecules The β ad and L f E minima occur at the same concentrations further strengthens the occurrence of molecular associations The interdependence of intermolecular free length and ultrasonic velocity was evolved from a model for sound propagation proposed by Eyring & Kincaid [18] The variation of ultrasonic velocity in a solution depends upon the increase or decrease of intermolecular free length after mixing the components The ultrasonic velocity should decrease if the intermolecular free length increases or vice versa as a result of mixing of components This fact is observed in the present investigation for Ethyl benzoate (EB) + p-xylene > Ethyl benzoate (EB) + o-xylene > Ethyl benzoate (EB) + o-chlorotoulene systems It is also observed that velocity decreases with increase in 888
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 temperature at any concentration The ultrasonic velocity values decrease with increase of temperature due to breaking of hetero and homo molecular clusters at high temperatures [19] Mole fraction Velocity U m/s TABLE-3 System-II : Ethylbenzoate() + p-xylene(x 2) Ultrasonic velocities, Densities, Viscosities and related excess parameters Density ρ ( kg/m 3 ) Viscosity η cp V E cm 3 mol -1 Δβ ad 10-12 m 2 N -1 12863 8528 0579 00874 12934 8759 0669-06428 -01311-00029 -00120 01772 12999 8983 0766-11717 -02425-00054 -00210 02697 13062 9199 0867-15786 -03251-00072 -00280 03648 13124 9406 0975-18552 -03739-00083 -00320 04628 13186 9603 1088-19918 -03874-00087 -00330 05638 13246 9789 1206-19779 -03713-00084 -00340 06678 13304 9962 1331-17879 -03238-00073 -00310 07751 13359 10122 1464-14219 -02492-00057 -00230 08858 13412 10265 1604-08230 -01394-00032 -00130 10000 13462 10392 1751 12742 8467 0551 00874 12804 8701 0628-06778 -01561-00035 -00140 01772 12864 8927 0713-12227 -02780-00062 -00230 02697 12925 9146 0803-16558 -03619-00081 -00300 03648 12985 9355 0898-19407 -04104-00092 -00340 04628 13044 9554 0999-20822 -04259-00096 -00360 05638 13101 9742 1104-20701 -04115-00093 -00360 06678 13158 9916 1216-18650 -03582-00082 -00330 07751 13213 10077 1335-14810 -02752-00063 -00260 08858 13267 10221 1461-08610 -01544-00035 -00160 10000 13319 10348 1596 12516 8429 0507 00874 12581 8664 0574-07054 -01603-00036 -00160 01772 12645 8892 0650-12901 -02872-00065 -00250 02697 12710 9111 0729-17324 -03739-00086 -00340 03648 12775 9320 0816-20248 -04244-00098 -00370 04628 12840 9519 0906-21726 -04411-00102 -00400 05638 12905 9706 1002-21514 -04226-00098 -00390 06678 12969 9880 1105-19496 -03720-00087 -00350 07751 13033 10039 1214-15396 -02848-00067 -00280 08858 13097 10182 1331-09055 -01612-00038 -00160 10000 13160 10306 1455 12335 8373 0482 00874 12398 8611 0542-07498 -01706-00039 -00160 01772 12462 8840 0609-13451 -02980-00069 -00260 02697 12527 9061 0681-18089 -03877-00090 -00350 03648 12591 9272 0758-21194 -04443-00104 -00400 04628 12657 9473 0841-22820 -04621-00108 -00420 05638 12723 9661 0928-22587 -04436-00104 -00420 06678 12789 9835 1022-20380 -03893-00092 -00380 07751 12856 9994 1122-16063 -02969-00070 -00310 08858 12923 10137 1229-09476 -01688-00040 -00200 10000 12990 10260 1348 The viscosity deviations depend on strength of interactions between like and unlike molecules The dependence of η on composition for the mixtures under study may be explained in terms of physical and chemical factors [20,21] The positive values of η signify strong intermolecular interactions and negative η values are represents weaker interaction between unlike molecules Specific chemical interactions involving hydrogen bond formation and dipole-dipole interactions between various components of liquids mixtures making the structure more compact and result in positive viscosity deviations The sign and magnitude of η also varies with structural characteristics of liquid components arising from geometrical fitting of one component into the structure of other component due to difference in molecular size and E L f (Ǻ) η cp 889
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 shape of components The negative values of η for all the three systems can be explained by the molecular sizes, as explained in the previous discussion Mole fraction Velocity U m/s TABLE-4 System-III : Ethylbenzoate() + o-chlorotoulene(x 2) Ultrasonic velocities, Densities, Viscosities and related excess parameters Density ρ gm/cm 3 Viscosity η cp V E cm 3 mol -1 Δβ ad 10-12 m 2 N -1 12838 10726 0870 00832 12894 10703 0939-01168 -00048-00040 01695 12951 10679 1009-02271 -00109-00100 02592 13009 10652 1083-03071 -00157-00001 -00150 03525 13069 10623 1162-03668 -00183-00001 -00190 04495 13131 10592 1245-04047 -00191-00001 -00210 05505 13194 10558 1334-04069 -00190-00001 -00210 06558 13259 10522 1430-03834 -00174-00001 -00180 07656 13326 10482 1531-03061 -00113-00130 08802 13394 10439 1638-01841 -00051-00070 10000 13462 10392 1751 12657 10680 0776 00832 12715 10658 0836-01268 -00092-00001 -00080 01695 12774 10635 0899-02475 -00200-00003 -00160 02592 12835 10609 0967-03380 -00274-00003 -00220 03525 12898 10580 1040-03964 -00315-00004 -00250 04495 12963 10550 1118-04451 -00353-00004 -00270 05505 13030 10516 1201-04456 -00347-00004 -00260 06558 13099 10480 1290-04203 -00328-00004 -00240 07656 13171 10440 1385-03405 -00242-00003 -00190 08802 13244 10395 1487-01884 -00125-00001 -00110 10000 13319 10348 1596 12445 10623 0732 00832 12506 10604 0783-01449 -00154-00002 -00090 01695 12569 10583 0838-02726 -00290-00005 -00170 02592 12634 10559 0897-03701 -00394-00006 -00220 03525 12702 10533 0961-04477 -00460-00007 -00260 04495 12772 10505 1029-05040 -00513-00008 -00280 05505 12844 10473 1102-05121 -00525-00008 -00280 06558 12919 10437 1181-04686 -00473-00007 -00250 07656 12997 10397 1266-03694 -00356-00005 -00200 08802 13077 10353 1357-02101 -00201-00003 -00110 10000 13160 10306 1455 12281 10601 0704 00832 12341 10581 0748-01624 -00181-00003 -00090 01695 12403 10559 0795-03082 -00344-00006 -00170 02592 12467 10534 0846-04244 -00478-00008 -00240 03525 12534 10506 0902-05090 -00559-00010 -00270 04495 12603 10475 0962-05598 -00614-00011 -00290 05505 12675 10440 1027-05617 -00604-00010 -00290 06558 12749 10402 1097-05242 -00570-00010 -00260 07656 12826 10359 1172-04172 -00457-00008 -00210 08802 12906 10310 1254-02212 -00249-00004 -00120 10000 12990 10260 1343 E L f (Ǻ) η cp 890
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 TABLE-5 Values of coefficints and standard deviation (σ) Temp K A 0 A 1 A 2 A 3 A 4 σ System-I : ethylbenzoate() + o-xylene(x 2) Excess Molar Volume(V E ) -32755 03654-00809 -00538 03407 00041-36035 06359-07006 -05402 09545 00054-41082 05762 02468-09313 -03993 00108-44308 03559 01408-02413 -09561 00103 Deviation in Adiabatic compressibility(δβ ad) -12125-00674 00416-00033 00010 00010-12396 -00708-00648 -00625-00701 00017-13071 -01114-00332 -00974-00848 00017-13569 -01609-00162 -00904-01865 00022 Deviation in Viscosity ( η) -01043-00081 00316-00014 -00253 00004-01243 -00077 00076-00094 -00203 00003-01238 -00117-00173 -00164 00305 00006-01328 00001-00192 -00152 00032 00004 Excess free length( L E f ) -00249-00005 00011-00001 -00265-00007 -00014-00013 -00015-00287 -00016-00006 -00022-00019 -00305-00029 -00002-00020 -00043 00001 System-II : ethylbenzoate() + p-xylene(x 2) Excess Molar Volume(V E ) -80167 00812-01586 -00491 00499 00045-83761 00272-01974 -00174-00070 00061-87378 00160-03952 00847 02131 00031-91806 00199 00709-00103 -06090 00030 Deviation in Adiabatic compressibility(δβ ad) -15384-02632 -00545 01382 01524 00009-16927 -02684-01177 -00018 00808 00014-17535 -02687-01265 00121 00961 00007-18396 -02538-00073 -00506-01224 00008 Deviation in Viscosity( η) -01329 00074-00599 -00368 00815 00009-01448 00028-00327 -00187-00006 00004-01599 -00120-00231 -00200-00085 00009-01684 -00046-00332 00096-00243 00006 Excess free length( L E f ) -00345-00052 -00009 00032 00034-00383 -00052-00024 00019-00406 -00054-00026 00004 00023-00431 -00051 00002-00011 -00029 System-III : ethylbenzoate() +o-chlorotoulene(x 2) Excess Molar Volume (V E ) -16481 01358-01046 -00157 01761 00036-18130 01528-01013 -01623 03877 00055-20579 01761 03453-01880 -02487 00033-22806 01849 00002-03872 04575 00042 Deviation in Adiabatic compressibility(δβ ad) -00764-00026 -00314-00211 01036 00007-01431 00058-00213 -00230 00945 00008-02081 00081 00014-00281 00306 00007-02488 00084-00232 -00210 00688 00007 Deviation in Viscosity( η) -00845-00073 00303 00200 00113 00003-01078 -00115-00216 00140 00399 00003-01128 -00043 00050-00069 -00024 00004-01157 -00114-00327 00102 00497 00004 Excess free length( L E f ) -00003-00001 -00008-00005 00026-00018 00001-00005 -00005 00024-00032 00001-00007 00008-00043 00001-00006 -00005 00017 891
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 00 00 02 04 06 08 10 V E cm 3 mol -1-02 -04-06 Fig1(a): Variation of excess molar volume with mole fraction of EB for the system EB + OX 000 00 02 04 06 08 10-002 β ad m 2 N -1-004 -006-008 Fig1(b) Variation of deviation in adiabatic compressibility with mole fraction of EB for the system EB+OX -00002 00 02 04 06 08 10 L f E / 10-10 m -00007-00012 Fig1(c): Variation of excess free length with mole fraction of EB for the system EB+OX 892
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 ηcp -002 000 00 02 04 06 08 10-001 -003-004 Fig1(d): Variation of deviation in viscosity with mole fraction of EB for the system EB+OX 00 00-05 02 04 06 08 10 V E cm 3 mol -1-10 -15-20 -25 Fig2(a): Variation of excess molar volume with mole fraction of EB for the system EB + PX 00 00-01 02 04 06 08 10 β ad m 2 N -1-02 -03-04 -05 Fig 2(b):Variation of deviation in adiabatic compressibility with mole fraction of EB for the system EB + PX 893
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 L f E / 10-10 m 0000 00 02 04 06 08 10-0003 -0006-0009 -0012 Fig 2(c): Variation of excess free length with mole fraction of EB for the system EB + PX 000 00-001 02 04 06 08 10 Δηcp -002-003 -004-005 Fig 2(d):Variation of excess viscosity with mole fraction of EB for the system EB + PX V E cm 3 mol -1 00 00-01 02 04 06 08 10-02 -03-04 -05-06 Fig3(a)Variation of excess molar volume with mole fraction of EB for the system EB +OCT 894
C Rambabu et al J Chem Pharm Res, 2015, 7(8):885-896 000 00 02 04 06 08 10-002 β ad m 2 N -1-004 -006-008 Fig 3(b):Variation of deviation in adiabatic compressibility with mole fraction of EB for the system EB + OCT 00002 L f E / 10-10 m -00001 00 02 04 06 08 10-00004 -00007-00010 -00013 Fig 3(c):Variation of excess free length with mole fraction of EB for the system EB + OCT Δηcp 0000 00 02 04 06 08 10-0010 -0020-0030 -0040 Fig 3(d): Variation of excess viscosity with mole fraction of EB for the system EB + OCT CONCLUSION Excess molar volumes (V E ), deviation in adiabatic compressibility ( β ad ), excess intermolecular free length (L f E ), deviation in viscosity ( η), are observed in negative trends The changes in values of all excess parameters are non linear and parabolic There is little deviations observed for almost all parameters for Ethyl benzoate (EB) + o- chlorotoulene system Acknowledgements The author conveys his thanks to Acharya Nagarjuna University REFERENCES [1] R Koningaveld, RFT Stepto, Macromolecules, 1977, 10, 1166-1169 895
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