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CN101500972A 1，2-二氯乙烷的生产方法 失效 - 权利终止

1，2-二氯乙烷的生产方法
摘要：
从一个乙烷流开始生产1，2－二氯乙烷的方法，根据该方法：a)使该乙烷流经受一种催化的氧化脱氢作用产生一个包含乙烯、未转化的乙烷、水和一些二级组分的气体混合物；b)任选将所述气体混合物洗涤并且干燥，由此产生一个干燥的气体混合物；c)在一个可任选的额外的纯化步骤之后，使包含在步骤e)中分离的从氯化反应器R2得来的产品流的所述干燥的气体混合物经受一种吸收作用A，该吸收作用包括将所述气体混合物分离成一个馏分(馏分A)，该馏分富含比乙烯轻的化合物且包含一些乙烯，以及分离成一个馏分F1；d)将馏分A传送到一个氯化反应器R1，其中存在于馏分A中的大部分乙烯被转化成1，2－二氯乙烷并且将所获得的1，2－二氯乙烷从来自氯化反应器R1的产品流中分离；e)使馏分F1经受一种解吸作用D1，该解吸作用包括将馏分F1分离成除去了比乙烯轻的化合物的一个乙烯馏分(馏分C)以及一个馏分F2，该乙烯馏分被传送到一个氯化反应器R2，得自这个反应器的产品流在已经可任选地提取了所形成的1，2－二氯乙烷之后被加入到经受了步骤c)的干燥的气体混合物中；f)使馏分F2经受一种解吸作用D2，该解吸作用包括将馏分F2分离成一个富含乙烯的馏分(馏分B)以及一个馏分F3，该馏分F3可任选地包含在氯化反应器R2中形成然后被提取的1，2－二氯乙烷(如果它没有在此前已经被提取的话)，该馏分被再循环至吸收作用A，可任选地在一个额外的处理之后，该处理旨在减少馏分F3中比乙烷重的化合物的浓度；g)将馏分B传送到一个氧氯化反应器，其中存在于馏分B中的大部分乙烯被转化成1，2－二氯乙烷，所获得的1，2－二氯乙烷从来自该氧氯化反应器的产品流中分离并且可任选地加入到在氯化反应器R1中形成的1，2－二氯乙烷并且可任选地加入到在氯化反应器R2中形成的1，2－二氯乙烷；并且h)来自该氧氯化反应器的产品流(从该产品流中已经提取了1，2－二氯乙烷)可任选地包含先前在步骤b)至g)之一中引入的一个额外的乙烷流，该产品流在已被可任选地吹扫了气体之后和/或在为了消除其中所含的氯化产物的一个可任选的处理之后被可任选地循环至步骤a)。
摘要（英）：

Process for the manufacture of 1,2-dichloroethane starting from a stream of ethane according to which: a) the stream of ethane is subjected to a catalytic oxydehydrogenation producing a gas mixture containing ethylene, unconverted ethane, water and secondary constituents; b) said gas mixture is optionally washed and dried thus producing a dry gas mixture; c) after an optional additional purification step, said dry gas mixture comprising the stream of products derived from the chlorination reactor R2 separated in step e) is subjected to an absorption A which consists of separating said gas mixture into a fraction enriched with the compounds that are lighter than ethylene containing some of the ethylene (fraction A) and into a fraction F1; d) fraction A is conveyed to a chlorination reactorR1 in which most of the ethylene present in fraction A is converted into 1,2-dichloroethane and the 1,2-dichl oroethane obtained is separated from the stream of products derived from the chlorinationreactor R1; e) fraction F1 is subjected to a desorption D1 which consists of separating fraction F1 into an ethylene fraction depleted of the compounds that are lighter than ethylene (fraction C) which is conveyed to a chlorination reactor R2, the stream of products derived from this reactor being added to the dry gas mixture subjectedto step c) after having optionally extracted the 1,2- dichloroethane formed, and into a fraction F2; f) f raction F2 is subjected to a desorption D2 which consists of separating fraction F2 into a fraction enriched with ethylene (fraction B) and into a fract ionF3, optionally containing the 1,2-dichloroethane formed in the chlorination reactor R2 then extracted, if it has not previously been extracted, which is recycled to the absorption A, optionally afteran additional treatment intended to reduce the concentration, in fraction F3, of the compounds that are heavier than ethane.

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