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부가결정화를 이용하여 납사분해유의 C9 방향족 혼합물로부터 Pseudocumene분리
Separation of Pseudocumene from C9 Aromatic Raffinate by Adductive Crystallization
HWAHAK KONGHAK, December 1992, 30(6), 673-680(8), NONE
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Abstract
부가결정화 기술을 이용하여 납사분해센타에서 부생되는 C9 방향족 혼합물로부터 pseudocumene을 분리하였다. 원료투입비, 결정화온도, 용매비, 냉각속도 등을 변수로 하여 thiourea 부가특성을 조사하였으며, pesudocu-mene을 분리할 수 있는 최적조건을 조사하였다. Pseudocumene은 C9 방향족 혼합물로부터 4단계 부가결정화 조작에 의해서 99.7wt%의 순도로 분리될 수 있었다. Trimethylbenzene 이성체에 대하여 thiourea에 부가되는 경향은 pseudocumene>hemimellitene>>mesitylene의 순이었다. C9 방향족 화합물의 이성분계에 대한 부가결정화의 분리도를 추출결정화 및 증류의 분리도와 비교하였다. 이들 이성분계에 대하여 부가결정화에 의한 분리정도(extent of separation)는 한 이론 증류단수의 최대분리정도 보다 5.4-24배 컸으며, 추출결정화에 비해 1.9배 컸다. 또한 부가결정화의 한 단(stage)에서 분리할 수 있는 thiourea의 포획도는 추출결정화에 비해 6배 정도 컸다.
The separation of pseudocumene from the C9 aromatic raffinate found in naphtha cracker was studied using adductive crystallization with thiourea. The charactristics of thiourea adduction are investigated on the bariables of feed ratio, temperature, solvent ratio and cooling rate, and optimum conditions on the separation of pseudocumene are investigated on these variables. Pseudocumene can be separated by four stages adductive crystallization from C9 aromatics as a purity of 99.7wt%. With the trimethylbenzene isomers, the tendency for thiourea adduction is pseudocumene>hemimellitene>>mesitylene. The separation capacities of adductive crystallization for two binary mixtures of C9 aromatics were compared with those of distillation and extractive crystallization. The extent of separation by one adduction is approximately 5.4 to 24.0 times greater than maximum separation that could be obtained by one theoretical distillation stage. The entrapping capacity is approximately 6.0times greater than the entrapping capacity that could be obtained by extractive crystallization.
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