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1. 发明授权

US4178309A Manufacture of symmetrical dialkylureas 失效
标题翻译：对称二烷基脲的制造
公开(公告)号：US4178309A
公开(公告)日：1979-12-11
申请号：US930160
申请日：1978-08-02
申请人： Dietrich Luetzow , Norbert Neth , Ulrich Wagner , Klaus Volkamer
发明人： Dietrich Luetzow , Norbert Neth , Ulrich Wagner , Klaus Volkamer
IPC分类号： C07C275/06 , C07C67/00 , C07C239/00 , C07C273/18 , C07C127/15
CPC分类号： C07C273/189
摘要： A process for the manufacture of symmetrical dialkylureas by reacting monoalkylamines with CO.sub.2 at an elevated temperature and under superatmospheric pressure, in which the unconverted starting materials, water and the by-products formed in the reaction zone, as well as alkylamine alkylcarbamate, after thermal decomposition into monoalkylamine, CO.sub.2 and water, are separated from the dialkylurea formed, and thereafter a part of the unconverted starting materials plus by-products, with or without water, may or may not be recycled to the reaction zone, before isolating an aqueous solution, containing monoalkylamines, CO.sub.2 and other by-products, which solution is treated with alkali metal hydroxide solution in a column, the monoalkylamine, after separation from carbon dioxide and water, being recycled to the reaction zone. The dialkylureas obtained contain not more than 1% of monoalkylurea and 1% of trialkylurea, and may be used as starting materials for various syntheses.
摘要翻译：在高温和超大气压下使单烷基胺与CO 2反应制备对称二烷基脲的方法，其中未转化的原料，反应区中形成的水和副产物以及烷基氨基甲酸烷基胺在热分解后分离成单烷基胺，二氧化碳和水，与形成的二烷基脲分离，然后在分离水溶液之前，将一部分未转化的原料加副产物（含或不含水）再循环至反应区，或不再循环至反应区，含有单烷基胺，CO 2和其它副产物，该溶液用柱中的碱金属氢氧化物溶液处理，单烷基胺在与二氧化碳和水分离后再循环至反应区。得到的二烷基脲含有不多于1％的单烷基脲和1％的三烷基脲，可用作各种合成的起始原料。

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