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1,1,1-삼염화에탄의 합성공정개발
Process Development of 1, 1, 1-Trichloroethane Synthesis
HWAHAK KONGHAK, June 1976, 14(3), 169-180(12), NONE
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Abstract
염화비닐 합성공정의 부산물로 생산되고 있는 1,1,2-삼염화에탄을 접촉분해하여 염화비닐리덴을 만들고 이 과정에서 생산되는 염화수소 가스를 이용하여 염화비닐리덴으로부터 1,1,1-삼염화에탄을 합성하는 공정에 대하여 연구하였다. 1,1,2-삼염화에탄의 분해에 사용된 촉매는 활성탄에 담지시킨 염화바륨 및 염화동으로서 20∼30 % 염화바륨 담지촉매가 염화비닐리덴의 선택도에 가장 좋은 결과를 보여주었다. 반응온도 400∼500 ℃ 범위에서 염화비닐리덴의 선택도는 최고 35 %까지 얻을 수 있었다. 1,1,1-삼염화에탄의 합성에는 Friedel-Craft촉매를 사용하였으며 1,1,1-삼염화에탄의 합성반응은 염화수소 가스를 계속해서 과잉으로 공급할 때 염화비닐리덴의 농도에 대하여 일차반응이며 0.6 %의 촉매농도 범위에서 촉매농도에 비례하는 것을 확인하였다.
A process is developed for the synthesis of 1,1,1-trichloroethane from 1,1,2-trichloroethane, a byproduct produced in the vinyl chloride process. Catalytic dehydrochlorination of the 1,1,2-trichloroethane produces vinylidene chloride, 1,2-dichloroethylene and hydrogen chloride, of these vinylidene chloride and hydrogen chloride react subsequently to form the 1,1,1-trichloroethane in a Friedel-Craft catalytic process. Barium chloride or copper chloride of 5 to 30 percent by weight supported on the activated carbon is used as catalyst. The selectivity for vinylidene chloride is attained up to 35 percent in the reaction temperature range of 400 ℃ to 500 ℃ using 20 to 30 percent barium chloride catalyst. It is also confirmed that the synthesis of 1,1,1-trichloroethane is a first order reaction with respect to the concentration of vinylidene chloride when excess hydrogen chloride gas is bubbled continuously into the catalytic slurry reactor, and its rate is linearly proportional to the concentration of anhydrous aluminum chloride catalyst.