申请人:Nippon Shokubai Kagaku Kogyo Co., Ltd.
公开号:US04840749A1
公开(公告)日:1989-06-20
A process for producing 1-aminoanthraquinone, which comprises (a) a step of oxidizing 1-nitronaphthalene in the liquid phase with an acidic aqueous solution containing a ceric ion as an oxidizing agent and separating crystals containing 5-nitro-1,4-naphthoquinone and the acidic aqueous solution containing a cerium ion from the resulting reaction mixture, (b) a step of subjecting the 5-nitro-1,4-naphthoquinone obtained in step (a) to Diels-Alder reaction with 1,3-butadiene in a solvent, precipitating crystals containing the resulting 5-nitro-1,4,4a,9a-tetrahydroanthraquinone, separating them by filtration, separating and recovering the unreacted 1-nitronaphthalene and the solvent in the filtrate in a separation tower, and recycling 1-nitronaphthalene to step (a) for use as the starting material and re-using the recovered solvent for the Diels-Alder reaction, (c) a step of reducing 5-nitro-1,4,4a,9a-tetrahydroanthraquinone obtained in step (b), separating crystals containing 1-aminoanthraquinone and purifying them, and (d) a step of electrolytically oxidizing the acidic aqueous solution containing a cerium ion separated in step (a) to convert the cerous ion in the acidic aqueous solution to a ceric ion and recycling the resulting acidic aqueous solution containing a ceric ion to step (a) for re-use as the oxidizing agent.
一种制备1-氨基蒽醌的方法,包括以下步骤:(a)将1-硝基萘在含有铈离子的酸性水溶液中液相氧化为5-硝基-1,4-萘醌,将含有5-硝基-1,4-萘醌晶体和含有铈离子的酸性水溶液从反应混合物中分离出来;(b)将步骤(a)中得到的5-硝基-1,4-萘醌与1,3-丁二烯在溶剂中进行Diels-Alder反应,沉淀含有所得的5-硝基-1,4,4a,9a-四氢蒽醌的晶体,通过过滤将其分离出来,将未反应的1-硝基萘和溶剂从滤液中分离和回收,在分离塔中回收1-硝基萘并将其回收到步骤(a)中用作起始物质,并将回收的溶剂用于Diels-Alder反应;(c)将步骤(b)中得到的5-硝基-1,4,4a,9a-四氢蒽醌还原,分离含有1-氨基蒽醌的晶体并纯化;(d)电解氧化步骤(a)中分离的含有铈离子的酸性水溶液,将其中的铈离子转化为铈离子,并将含有铈离子的酸性水溶液回收到步骤(a)中再次用作氧化剂。