The invention is related to a method for preparing 4-alkyl-2-hydroxy-3,5-dichlorobenzene sulphonic acids by sulphonating 4-chloro-3-alkylphenol and by chlorinating 4-alkyl-2-hydroxy-5-chlorobenzene sulphonic acid present in an acidic reaction mixture. According to the invention, chlorination is carried out by adding, to the acidic reaction mixture, salts of hypochlorous and/or chloric acids and, when needed, hydrochloric acid or its salt.
本发明涉及一种制备 4-烷基-2-羟基-
3,5-二氯苯磺酸的方法,该方法通过对 4-
氯-3-烷基
酚进行磺化,并对存在于酸性反应混合物中的 4-烷基-2-羟基-5-
氯苯磺酸进行
氯化。根据本发明,
氯化是通过在酸性反应混合物中加入
次氯酸和/或
氯酸的盐,必要时加入
盐酸或其盐来实现的。