PROCESS FOR THE PREPARATION OF VERY PURE MONOSULFONIC ACIDS OF TRIPHENYL-METHANE DYESTUFFS,申请号USD3671553-传众专利搜索

PROCESS FOR THE PREPARATION OF VERY PURE MONOSULFONIC ACIDS OF TRIPHENYL-METHANE DYESTUFFS

申请公布号：US3671553(A)

申请号：USD3671553

申请日期：1970.04.13

申请公布日期：1972.06.20

申请人：

FARBWERKE HOECHST AG. VORMALS MEISTER LUCIUS & BRUNING

发明人：THEODOR PAPENFUSS;ERNST SPIETSCHKA

分类号：C09B11/00;C09B11/12;(IPC1-7):C09B11/12

主分类号：C09B11/00

摘要：Process for the preparation of very pure monosulfonic acids of triphenyl-methane dyestuffs by treating a solution of the appropriate color base with aqueous sulfuric acid, filtering the suspension obtained, treating the filter residue with an inert less polar organic solvent which is not miscible with water, and isolating the color base sulfate or diluting the solution of the color base with an inert less polar organic solvent that is not miscible with water, and then treating it with dilute sulfuric acid, filtering the suspension obtained, treating the filter residue consisting substantially of color base sulfate and amine sulfate, and isolating the color base sulfate.