Highly concentrated aqueous solutions of n,n-dialkyl-glycines and process for preparation thereof
申请人:——
公开号:US20040238786A1
公开(公告)日:2004-12-02
An aqueous high-concentration solution of N,N-dialkylglycine, economical, easy to handle, and useful for subsequent organic chemical reactions, is provided. Also is provided a process for production thereof. The aqueous high-concentration solution of N,N-dialkylglycine which contains the N,N-dialkylglycine at a concentration of 30-80% by mass, and a metal-mineral acid salt at a content of 0.3-3% by mass can be produced industrially from an aqueous N,N-dialkylglycine alkali metal salt as the source material by the steps of
(i) neutralizing an aqueous solution of an N,N-dialkylglycine alkali metal salt with a mineral acid,
(ii) condensing the obtained aqueous solution by removal of water, and
(iii) separating by solid-liquid separation the deposited alkali metal-mineral acid salt from the resulting slurry of the aqueous N,N-dialkylglycine solution and the alkali metal-mineral acid salt.
提供了一种水溶性高浓度的N,N-二烷基甘氨酸溶液,经济实用,易于操作,并可用于随后的有机化学反应。同时提供了其生产工艺。该水溶性高浓度的N,N-二烷基甘氨酸溶液含有30-80%的N,N-二烷基甘氨酸质量浓度和0.3-3%的金属-矿物酸盐含量,可以从水溶性N,N-二烷基甘氨酸碱金属盐作为原料进行工业生产,其步骤包括(i)用矿物酸中和水溶性N,N-二烷基甘氨酸碱金属盐的水溶液,(ii)通过去除水来浓缩所得的水溶液,(iii)将沉淀的碱金属-矿物酸盐从所得的水溶性N,N-二烷基甘氨酸溶液和碱金属-矿物酸盐的混合物中通过固液分离分离出来。