申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0581613A1
公开(公告)日:1994-02-02
A process for preparing an N,O-dialkylhydroxycarbamic acid ester, which comprises reacting hydroxylamine or a salt thereof with a dihydrocarbyl carbonate in the presence of a base to prepare hydroxycarbamic acid ester, and subsequently alkylating this compound with an alkylating agent; a process for recovering an N,O-dialkylhydroxycarbamic acid ester, which comprises azeotropically distilling the ester with water from a solution containing the ester; a process for preparing an N,O-dialkylhydroxylamine, which comprises hydrolyzing an N,O-dialkylhydroxycarbamic acid ester in an aqueous solvent in the presence of an alkali ; a process for purifying an N,O-dialkylhydroxylamine hydrochloride, which comprises adding an aldehyde or a ketone to a solution of an N,O-dialkylhydroxylamine hydrochloride containing an O-alkylhydroxylamine hydrochloride as an impurity to convert the O-alkylhydroxylamine hydrochloride into O-alkyl aldoxime or O-alkyl ketoxime, and subsequently separating the N,O-dialkylhydroxylamine hydroxhloride from the reaction system ; and a process for separating a N,O-dialkylhydroxylamine hydrochloride, which comprises (i) adding benzene or alkylated benzene to an aqueous solution containing the N,O-dialkylhydroxylamine hydrochloride, azeotropically removing water or a hydrochloride solution, and subsequently (ii) adding an alcohol to obtain the N,O-dialkylhydroxylamine hydrochloride in crystal form.
一种制备 N,O-二烷基羟基氨基甲酸酯的工艺,包括在碱存在下使羟胺或其盐与二氢羰基碳酸酯反应制备羟基氨基甲酸酯,然后用烷基化剂使该化合物烷基化;一种回收 N,O-二烷基羟基氨基甲酸酯的工艺,包括从含有该酯的溶液中用水共沸蒸馏该酯; 一种制备 N,O-二烷基羟基胺的工艺,包括在碱存在下在水性溶剂中水解 N,O-二烷基羟基氨基甲酸酯;一种提纯 N,O-二烷基羟胺盐酸盐的工艺,包括向含有 O-烷基羟胺盐酸盐作为杂质的 N,O-二烷基羟胺盐酸盐溶液中加入醛或酮,将 O-烷基羟胺盐酸盐转化为 O-烷基醛肟或 O-烷基酮肟,然后将 N,O-二烷基羟胺盐酸盐从反应体系中分离出来;以及一种分离 N,O-二烷基羟胺盐酸盐的工艺,包括(i)向含有 N,O-二烷基羟胺盐酸盐的水溶液中加入苯或烷基化苯,共沸除去水或盐酸盐溶液,然后(ii)加入醇,以获得晶体状的 N,O-二烷基羟胺盐酸盐。