公开(公告)号：US4415750A

公开(公告)日：1983-11-15

申请号：US358314

申请日：1982-03-15

申请人： Heinrich Volk ,  Theodor Papenfahs

发明人： Heinrich Volk ,  Theodor Papenfahs

IPC分类号： C07C51/42 ,  C07C51/00 ,  C07C51/15 ,  C07C51/47 ,  C07C65/11 ,  C07C67/00 ,  C07C51/43

CPC分类号： C07C51/47

摘要： In the carboxylation of 2-alkali metal naphtholates under pressure and at temperatures of above 200.degree. C., apart from the alkali metal salt of 2-naphthol-3-carboxylic acid and free 2-naphthol considerable amounts of resinous by-products are obtained which according to the hitherto known processes have to be separated and removed in a very expensive manner. According to this invention, the alkali-soluble acidic resins are separated from this carboxylation melt after its solution in water during the work-up of the carboxylation product by means of a cationic quaternary ammonium compound. These surface-active compounds precipitate the alkali-soluble acidic resins in such a manner that they can be easily removed from the alkali metal salts of 2-hydroxynaphthalene-3-carboxylic acid dissolved in water.

摘要翻译： 在加压和200℃以上的2-碱金属萘酚化合物中，除了2-萘酚-3-羧酸的碱金属盐和游离的2-萘酚之外，得到相当量的树脂副产物 根据迄今已知的方法必须以非常昂贵的方式分离和去除。 根据本发明，通过阳离子季铵化合物在羧化产物的后处理中，将碱溶性酸性树脂与该羧化熔体在其溶于水后分离。 这些表面活性化合物使碱溶性酸性树脂以易于从溶解于水中的2-羟基萘-3-羧酸的碱金属盐中除去的方式析出。