Process for the preparation of alkali metal diphenylates and free
hydroxydiphenyls
    1.
    发明授权
    Process for the preparation of alkali metal diphenylates and free hydroxydiphenyls 失效
    制备碱金属二苯基酯和游离羟基二苯基的方法

    公开(公告)号:US4467123A

    公开(公告)日:1984-08-21

    申请号:US459738

    申请日:1983-01-20

    CPC分类号: C07C37/04

    摘要: Hydroxydiphenyls can be prepared by reacting diphenylsulphonic acids or their alkali metal salts with an alkali metal hydroxide at elevated temperature and elevated pressure, in the presence of water. For this purpose, the diphenylsulphonic acids or their alkali metal salts are reacted, at a temperature between 280.degree. and 330.degree. C. and a pressure of up to 120 bar, with an amount of aqueous alkali metal hydroxide having a concentration of at least 50% by weight, such that, after all acidic groups have been neutralized, 3 to 25 mols of alkali metal hydroxide per equivalent of sulphonate group are present in the reaction mixture. Mineral acids are added to the alkaline reaction mixture, after it has been cooled and diluted with water, until the pH value is less than 8, and the precipitated hydroxydiphenyl is isolated at a temperature from -5.degree. C. to +100.degree. C.

    摘要翻译: 羟基二苯可以通过使二苯基磺酸或其碱金属盐与碱金属氢氧化物在高温和高压下,在水的存在下反应来制备。 为此,二苯基磺酸或其碱金属盐在280-330℃的温度和至多120巴的压力下反应,一定量的碱金属氢氧化物水溶液的浓度至少为50 重量%,使得在所有酸性基团被中和后,每当量磺酸盐基团中存在3至25摩尔碱金属氢氧化物基团。 将矿物酸加入到碱性反应混合物中,冷却并用水稀释,直到pH值小于8,沉淀的羟基二苯在-5℃至+ 100℃的温度下分离。