A process for preparing a hydrazine hydrohalide comprising the steps of:
(a) oxiding a benzophenone-imine with molecular oxygen in the presence of a copper halide catalyst to produce benzophenone-azine;
(b) contacting the oxidation reaction mixture with an aqueous solution containing a hydrohalic acid thereby hydrolyzing the benzophenone-azines to produce a hydrazine hydrohalide and, simultaneously extracting and removing the catalyst with the hydrohalide acid-containing aqueous solution to obtain an aqueous solution containing the hydrazine hydrohalide and the catalyst;
(c) separating the aqueous solution and adjusting the solution to a pH of from 3 to 7 with an alkali;
(d) contacting the aqueous solution with a benzophenone-imine to extract the catalyst;
(e) separating the catalyst-containing benzophenone-imines solution from the aqueous solution containing the hydrazine hydrohalide to recover the hydrazine hydrohalide and to recycle the catalyst-containing benzophenone-imine solution to step (a).
The process is advantageous in that the catalyst is easily recovered for reuse.
一种制备氢卤化
肼的工艺,包括以下步骤
(a) 在卤化
铜催化剂存在下,用分子氧氧化
二苯甲酮亚胺,生成
二苯甲酮嗪;
(b) 将氧化反应混合物与含有氢卤酸的
水溶液接触,从而
水解
二苯甲酮嗪,生成氢卤化
肼,同时用含有氢卤酸的
水溶液萃取并除去催化剂,得到含有氢卤化
肼和催化剂的
水溶液;
(c) 分离
水溶液,并用碱将溶液的 pH 值调节至 3 至 7;
(d) 将
水溶液与
二苯甲酮亚胺接触以提取催化剂;
(e) 将含催化剂的
二苯甲酮-
亚胺溶液与含
肼氢卤化物的
水溶液分离,以回收
肼氢卤化物,并将含催化剂的
二苯甲酮-
亚胺溶液循环至步骤(a)。
该工艺的优点是催化剂易于回收再利用。