发明名称 |
PROCESS FOR THE MANUFACTURE OF PREPARATIONS OF WATER SOLUBLE ORGANIC DYES |
摘要 |
A process for the preparation of formulations of water-soluble organic dyes starting from an aqueous salt-containing suspension of the untreated dye and using membrane separation methods, which process comprises substantially freeing the aqueous suspension of the untreated dye from by-products and reducing the salt concentration by more than half in a first membrane separation treatment, then diluting the dye suspension in a further optional step and effecting deionization and concentration in a second membrane separation treatment and converting the concentrate so obtained into a liquid or solid commercial formulation. This multi-step membrane separation process, e.g. ultrafiltration combined with hyperfiltration, results in a high rate of permeation through the membrane and avoids operating problems caused by membrane clogging. |
申请公布号 |
EP0197006(B1) |
申请公布日期 |
1991.12.11 |
申请号 |
EP19860810136 |
申请日期 |
1986.03.21 |
申请人 |
CIBA-GEIGY AG |
发明人 |
FOERTSCH, BRUNO, DR.;RABASSA, ALBERTO;BRUTTEL, BEAT, DR. |
分类号 |
C09B67/54;D06L3/12 |
主分类号 |
C09B67/54 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|