냉동 증류 공정을 이용한 벤젠-시크로헥산계의 고순도 분리

이동구; 박상언; 이영길

HWAHAK KONGHAK, Vol.28, No.6, 617-623, December, 1990

Export Citation

냉동 증류 공정을 이용한 벤젠-시크로헥산계의 고순도 분리

Application of Distillative Freezing Process to Separate Benzene-Cyclohexane System

이동구, 박상언, 이영길

초록

최소 공비 혼합물을 형성하는 벤젠-시크로헥산계에 냉동 증류 공정을 적용하여 고순도의 벤젠 혹은 시크로헥산을 얻기 위한 조사를 행하였다. 분리 목적물을 벤젠으로 하였을 때 초기농도가 50% 이상이면 고순도 벤젠을 얻을 수 있었고, 분리 목적물을 시크로헥산으로 하였을 때는 초기농도가 90% 이상으로 높아야만 고순도 시크로헥산을 얻을 수 있었다. 불순물의 농도가 증가할수록 결정이 처음 생성될 때의 온도 및 압력은 감소하고, 결정이 처음 생성되는 시간과 dry-out 시간은 증가한다. 또한 결정이 생성될 때까지의 온도 profile을 살펴보면, 액체 표면의 온도와 액체표면 위의 기체 온도는 sample holding tray에 있는 액체 온도보다 더 낮음을 알 수 있다.

A distillative freezing method was applied to get high-pure benzene or cyclohexane from benzene-cy-clohexane mixture, which forms a minimum azeotrope. Over 50% of the initial concentration of benzene in the mix-ture, very high-pure benzene could be separated by this distillative freezing technique. However, when the object pro-duct is cyclohexane, the concentration of cyclohexane in the mixture should be over 90%. The temperature and pres-sure condition for the initial crystal formation are reversely related on the initial concentration of the impure material in feed. The time needed for the crystal formation and dry-out was found to be longer as the concentration of impurity in feed increased. Just before the freezing occurs, temperature profiles revealed that the temperature of the liquid sur-face as well as of the vapor just above the liquid surface were lower than that of the liquid itself on the sample holding tray.

[References]

Billet R, "Distillation Engineering," Chemical Publishing Co., New York, NY (1979)
Jost W, Chem. Ing. Tech., 3, 64 (1951)
Dunn CL, Miller RW, Am. Inst. Chem. Eng., 41, 631 (1945)
Kita Y, Matsumodo S, Yonezawa D, J. Colloid Interface Sci., 62(1), 87 (1977)
Kataoka T, Konada D, Eguchi W, Kag. Kog. Jpn., 41(4), 179 (1977)
Park HS, Yu JH, HWAHAK KONGHAK, 20(3), 171 (1982)
Chang BM, Chung TS, HWAHAK KONGHAK, 25(3), 209 (1987)
Cheng CY, Cheng SW, U.S. Patent, 4,218,898 (1980)
Cheng CY, Berry DL, Proceedings of the Second World Congress of Chem. Eng., Montreal, Canada (1981)
Cheng CY, Cheng SW, U.S. Patent, 4,378,984 (1983)
Reid RC, Prausnitz JM, Sherwood TK, "The Properties of Gases and Liquids," 4th ed., McGraw-Hill, New York, NY (1977)
Raznjevic K, "Handbook of Thermodynamic Tables and Charts," McGraw-Hill, New York, NY (1976)
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Yaws CL, "Physical Properties," Chem. Eng., McGraw-Hill, New York, NY (1981)
Cho DH, Park SE, Lee YK, HWAHAK KONGHAK, 28(3), 342 (1990)
Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," John Wiley & Sons, Inc., New York, NY (1960)

[1] Billet R, "Distillation Engineering," Chemical Publishing Co., New York, NY (1979)

[2] Jost W, Chem. Ing. Tech., 3, 64 (1951)

[3] Dunn CL, Miller RW, Am. Inst. Chem. Eng., 41, 631 (1945)

[4] Kita Y, Matsumodo S, Yonezawa D, J. Colloid Interface Sci., 62(1), 87 (1977)

[5] Kataoka T, Konada D, Eguchi W, Kag. Kog. Jpn., 41(4), 179 (1977)

[6] Park HS, Yu JH, HWAHAK KONGHAK, 20(3), 171 (1982)

[7] Chang BM, Chung TS, HWAHAK KONGHAK, 25(3), 209 (1987)

[8] Cheng CY, Cheng SW, U.S. Patent, 4,218,898 (1980)

[9] Cheng CY, Berry DL, Proceedings of the Second World Congress of Chem. Eng., Montreal, Canada (1981)

[10] Cheng CY, Cheng SW, U.S. Patent, 4,378,984 (1983)

[11] Reid RC, Prausnitz JM, Sherwood TK, "The Properties of Gases and Liquids," 4th ed., McGraw-Hill, New York, NY (1977)

[12] Raznjevic K, "Handbook of Thermodynamic Tables and Charts," McGraw-Hill, New York, NY (1976)

[13] Weast RC, "CRC Handbook of Chemistry and Physics," 68th ed., CRC Press, Boca Raton, FL (1987)

[14] Yaws CL, "Physical Properties," Chem. Eng., McGraw-Hill, New York, NY (1981)

[15] Cho DH, Park SE, Lee YK, HWAHAK KONGHAK, 28(3), 342 (1990)

[16] Bird RB, Stewart WE, Lightfoot EN, "Transport Phenomena," John Wiley & Sons, Inc., New York, NY (1960)