申请人:NICCA CHEMICAL CO., LTD.
公开号:EP0627415A1
公开(公告)日:1994-12-07
A method of producing a high purity 2,4'-dihydroxydiphenylsulfone comprises producing a crude 2,4'-dihydroxydiphenylsulfone by mixing and heating one or more kinds of phenol and sulfuric acid to bring them into reaction with each other in the presence of at least one kind of catalyst selected from phosphonic acid, phosphinic acid and salts thereof in the absence of a solvent or in the presence of an aromatic hydrocarbon solvent having a boiling point at atmospheric pressure of 130 to 200°C and purifying the crude 2,4'-dihydroxydiphenylsulfone thus produced using (1) a mixed solvent containing 5 to 20 weight % of at least one kind selected from lower aliphatic alcohols and 95 to 80 weight % of at least one kind selected from aromatic hydrocarbons not containing halogen, (2) a mixed solvent containing 10 to 40 weight % of at least one kind selected from ketones and 90 to 60 weight % of at least one kind selected from aromatic hydrocarbons not containing halogen or (3) a mixed solvent containing 10 to 40 weight % of at least one kind selected from esters of acetic acid and 90 to 60 weight % of at least one kind selected from aromatic hydrocarbons not containing halogen. According to the method, 2,4'-dihydroxydiphenylsulfone useful as developer for thermal recording paper can be produced efficiently with high selectivity and a high purity product can be obtained efficiently.
一种生产高纯度 2,4'-二羟基二苯砜的方法,包括将一种或多种苯酚和硫酸混合并加热,使其在至少一种选自膦酸的催化剂存在下相互反应,从而生产出粗 2,4'-二羟基二苯砜、膦酸及其盐类中选出的至少一种催化剂的存在下,在无溶剂或有常压下沸点为 130 至 200°C 的芳香烃溶剂存在的情况下,使它们相互反应,然后提纯粗 2、(1) 一种混合溶剂,其中含有 5 至 20 重量%的至少一种选自低脂醇和 95 至 80 重量%的至少一种选自不含卤素的芳香烃、(2) 一种混合溶剂,含有 10 至 40 重量%的至少一种选自酮的物质和 90 至 60 重量%的至少一种选自不含卤素的芳香烃的物质,或 (3) 一种混合溶剂,含有 10 至 40 重量%的至少一种选自醋酸酯的物质和 90 至 60 重量%的至少一种选自不含卤素的芳香烃的物质。根据该方法,可高效、高选择性地生产用作热敏记录纸显影剂的 2,4'-二羟基二苯砜,并可高效地获得高纯度产品。