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냉동증류공정을 이용한 고순도 P-크실렌의 제조
Preparation of Super-pure p-Xylene by using Distillative Freezing Method
HWAHAK KONGHAK, June 1990, 28(3), 342-349(8), NONE
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Abstract
냉동증류법을 이용하여 C8-방향족화합물의 여러 혼합물로부터 고순도의 P-크실렌을 분리하였다. 냉동증류의 과정 중 액상혼합물이 결정화되는 성분의 어느 점 이하로 과냉각되는 현상이 관찰되었으며 원료중의 p-크실렌 함량이 적을수록 수율이 감소하는 경향을 보였다. 그러나, 원료 중의 p-크시렌의 함량에 따른 제한이 있었으며 그 이하의 함량에서도 고순도 분리가 이루어지기 위하여서는 완전한 단열조건이 필요함을 알았다.
Super-pure p-xylene was obtained from the various combinations of C8-aromatics by the distillative freezing method. The super-cooling effect was observed during distillative freezing operation. As the concentration of impurities in feed increased, the yield of product decreased. However, it was found that the concentration of p-xylene at feed composition was limited to get super-pure p-xylene. And adiabatic conditions during experiment should be con-sidered as a great importance through distillative freezing operation.
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Cheng CY, Cheng SW, U.S. Patent, 4,378,984 (1983)
Ries HC, "Xylene Separation," SRI Report No. 25 (1967)
Terrill DL, Sylvestre LF, Doherty MF, Ind. Eng. Chem. Process Des. Dev., 24, 1062 (1985)
Berg L, Kober PJ, AIChE J., 26(5), 862 (1980)
Berg L, AIChE J., 29, 694 (1983)
Marchall EF, U.S. Patent, 3,798,282 (1972)
Oden EC, U.S. Patent, 3,788,819 (1974)
Benris AG, U.S. Patent, 3,798,283 (1974)
Egan CJ, Luthy RV, Ind. Eng. Chem., 47, 250 (1955)
Chen NY, U.S. Patent, 3,668,266 (1972)
Rosback DH, U.S. Patent, 3,943,184 (1976)
Stine LO, Broughton T, U.S. Patent, 3,707,550 (1972)
Rosset AJ, U.S. Patent, 3,665,046 (1972)
de Rosset AJ, Neuzil RW, Tajbl DG, Braband JM, Sep. Sci. Technol., 15, 637 (1980)
Rowlinson JS, "Liquid and Liquid Mixtures," p. 207, Butterworth, London (1969)
Wales CE, Chem. Eng., 16, 187 (1963)
Cheng CY, Lin KH, Berry DL, "Super Purification of Volatile Substances by the Distillative Freezing Process," Second World Congress of Chemical Engineering, Montreal, Canada, Oct. 4-9 (1981)
Knight CA, "The Freezing of Supercooled Liquids," Van Nostrand Company, Inc., Princeton, NJ (1967)
Pamplin BR, "Crystal Growth," Pergamon Press, Oxford, England (1975)
Prausnitz JM, "Molecular Thermodynamics of Fluid-Phase Equilibrium," Prentice-Hall Inc., Englewood Cliffs (1969)
Sandler SL, "Chemical and Engineering Thermodynamics," John Wiley & Sons, New York (1977)
McCabe WL, Smith JC, "Unit Operations of Chemical Engineering," McGraw-Hill Book Company, New York (1956)
Reid RC, Prausnitz JM, Sherwood TK, "The Properties of Gases and Liquids," 3rd ed., McGraw-Hill Book Company, New York (1977)
