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4-氨基萘-1-磺酸

4-氨基萘-1-磺酸

CAS号:84-86-6
英文名:naphthionic acid
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化合物简介
Naphthionic acid is an organic compound with the formula C10H6(SO3H)(NH2). It is one of several aminonaphthalenesulfonic acids, derivatives of naphthalene containing both amine and sulfonic acid functional groups. It is a white solid, although commercial samples can appear gray. It is used in the synthesis of azo dyes such as Rocceline (a. k. a. Solid Red A), during which the amino group of the acid (in the form of a salt) is diazotated and then coupled with, in the case mentioned, β-naphthol. It is prepared by treating 1-aminonaphthalene with sulfuric acid.
基本信息
编号系统
物化性质
安全信息
生产方法及用途
生产方法
萘胺磺化得4-氨基-1-萘磺酸,经中和而得钠盐。磺化反应在溶剂三氯苯中进行,反应温度185-190℃,控制真空度2.67-5.33kPa,保温反应3.5h,取样检查终点。合格后降温到150℃,加碱水中和,控制pH=8-9。在70-80℃,将中和液加石炭酸和硫化碱,升温至90-95℃后静置,分层。上层料液经浓缩、冷却、结晶、离心甩干即为钠盐成品。收率83%。下层三氯苯经水洗回收套用。
用途
用作偶氮染料中间体,也用于食用色素