申请人:Huntsman Pertochemical Corporation
公开号:US05912382A1
公开(公告)日:1999-06-15
High purity hydroxyalkyl carbamates having alkyl groups with two, or three or more carbon atoms may be produced from anhydrous ammonia and alkylene carbonates at relatively low pressures, such as in a low pressure conventional kettle process. In this method, a reactor vessel is typically evacuated prior to reaction and anhydrous ammonia and alkylene carbonates are typically reacted in the presence of an initiator. Using this method, hydroxypropyl carbamate products having a purity greater than about 97%, and hydroxybutyl carbamate products having a purity greater than about 95% may be produced. Hydroxybutyl carbamate compositions comprising mixtures of 2-hydroxylbutyl carbamate and 1-hydroxymethyl propyl carbamate may also be produced.
高纯度的羟基烷基氨基甲酸酯可通过在相对较低压力下,例如在低压常规釜工艺中,从无水氨和烷基碳酸酯生产出具有两个、三个或更多碳原子的烷基基团。在这种方法中,反应前通常将反应器容器抽空,然后在引发剂的存在下,通常将无水氨和烷基碳酸酯反应。使用这种方法,可生产出纯度大约高于97%的羟丙基氨基甲酸酯产品,以及纯度大约高于95%的羟丁基氨基甲酸酯产品。还可以生产出含有2-羟基丁基氨基甲酸酯和1-羟甲基丙基氨基甲酸酯混合物的羟丁基氨基甲酸酯组合物。