Mensuration And Study On Engineering Foundation Data Of 1, 2-cyclohexanediol Synthesis

O-dihydroxybenzene is a very important fine chemical product and it has a prosperous future in the field of medicine, presticine, spice and fine organic synthesis and so on. To prepare O-dihydroxybenzene, 1,2-cyclohexanediol is a very important intermediate. So the study of basal technical data for 1,2-cyclohexanediol is very insistent and necessary. On the basis of a lot of experiments, we have obtained much basal technical data for 1,2-cyclohexanediol.1. To get the chemical thermodynamic data, firstly , we measured the melting points and heats of fusion of pure 1,2-cyclohexanediol and our product by digital melting-point apparatus and pressure DSC technique. We found that the melting point of our product was similar with trans-1,2-cyclohexanediol, so it demonstrates that the product is trans-1,2-cyclohexanediol. Then , we measured the standard combustion enthalpy , and we can calculated to get the standard formation enthalpy and the standard reaction enthalpy .Lastly ,we measured the heat capaciticies of pure trans-l,2-cyclohexanediol both in the solid state and in the liquid state . The chemical thermodynamic data for 1,2-cyclohexanediol are reported first time.2. To S-L-E , firstly , we have designed a set of laser monitoring observation system and programmed heating apparatus which can measure the solubilities with a high speed . Secendly , we measured the solubilities of 1,2-cyclohexanediol in water ,methyl acetate , acetic ester , propyl acetate ,butyl acetate , methyl acrylate , ethyl acrylate , acetqacetic ester . And we also measured the solubilities both in the mixture of acetic ester and water and in the mixture of butyl acetate and water .There are 180 data points ,mass are reported first time . Then ,a modified UNIFAC model is set up by defining new functional groups , CHD and CH2=CHCOO . And ,group volume parameters , group surface-aera parameters and group interaction parameters are optimized by means of computer program .This new modified UNIFAC model can perfecdy predict the solubilities on the above systems .The mean relative error is 7.4842% , but the antitype UNIFAC model is 42.1446%,so the new modified UNIFAC model is obviously excellent to the antitype UNIFAC model. Lastly ,wepredicted the experimental solubilities of both in the mixture of acetic ester and water and in the mixture of butyl acetate and water with the new modified UNIFAC model ,the result is perfectly.In the basis of the experimental solubilities of the mixture of acetic ester and water , butyl acetate and water , we have gotten the S-L-E phase diagrams and offer theory basis for the rectify and purify of 1,2-cyclohexanediol.On basis of the work in this paper ,we have gotten the melting point, heat of fusions, standard combustion enthalpy, standard formation enthalpy, standard reaction enthalpy and heat capaciticies of 1,2-cyclohexanediol. Then , we measured the solubilities of 1,2-cyclohexanediol in different solvents and set up a new modified UNIFAC modle by which the predict result is perfectly . These works fill up the blankness of chemical thermodynamic data and offer both theory basis and experimental datas for the industrial production of 1,2-cyclohexanediol.