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    • 5. 发明授权
    • Process for the preparation of dialkyl carbonates
    • 制备碳酸二甲酯的方法
    • US5142087A
    • 1992-08-25
    • US564324
    • 1990-08-08
    • Klaus JoergFranz-Josef MuellerWolfgang HarderRudolf Kummer
    • Klaus JoergFranz-Josef MuellerWolfgang HarderRudolf Kummer
    • B01J27/122B01J31/02C07B61/00C07C68/00C07C69/96
    • C07C68/005
    • A process for the continuous synthesis of dialkyl carbonates of the general formula I ##STR1## in which R denotes C.sub.1 -C.sub.4 -alkyl, by reaction of C.sub.1 -C.sub.4 -alkanols with carbon monoxide and oxygen at elevated temperature and pressure and in the presence of a copper-containing catalyst dissolved or suspended in the reaction medium, whereina) a gas stream containing carbon monoxide and oxygen is bubbled through the alkanol/catalyst mixture present in the reactor at a rate of from 1 to 100 liters per hours per gram of copper present in the reactor, part of which gas stream reacts with the alkanol to form dialkyl carbonate and water, which components are continuously entrained, together with alkanol, as a gaseous mixture, from the reaction mixture by means of the remaining, unreacted portion of the carbon monoxide/oxygen gas stream, whereuponb) the resulting gaseous mixture is separated, in a separator, into gaseous and liquid phases, the gaseous phase being recycled to the reactor if desired, andc) the liquid phase, which essentially consists of dialkyl carbonate, water and alkanol, is separated into its components, the dialkyl carbonate being isolated and the alkanol, if desired, recycled to the reactor, andd) the liquid in the reactor is replenished by adding fresh or recycled alkanol at the rate at which the alkanol is consumed and discharged.
    • 通过在升高的温度和压力下将C1-C4-链烷醇与一氧化碳和氧气反应,连续合成通式I的二烷基碳酸酯的方法,其中R表示C 1 -C 4 - 烷基, 溶解或悬浮在反应介质中的含铜催化剂的存在,其中a)含有一氧化碳和氧气的气流以1至100升/小时的速率通过反应器中存在的链烷醇/催化剂混合物 存在于反应器中的每克铜,其中一部分气流与链烷醇反应以形成碳酸二烷基酯和水,该组分与来自反应混合物的烷醇作为气态混合物一起通过剩余的, 一氧化碳/氧气流的未反应部分,然后b)将所得气体混合物在分离器中分离成气相和液相,如果需要,将气相再循环至反应器 ,和c)基本上由碳酸二烷基酯,水和链烷醇组成的液相被分离成其组分,分离出碳酸二烷基酯,如果需要,链烷醇再循环到反应器中,和d)反应器中的液体 通过以消耗和排出链烷醇的速率加入新鲜或回收的链烷醇来补充。