Title:
PROCESS FOR PREPARING SOLUTIONS OF ANIONIC ORGANIC COMPOUNDS
Document Type and Number:
WIPO Patent Application WO2001090257
Kind Code:
A3
Abstract:
Described is a process for preparing concentrated solutions or suspensions of anionic organic compounds which comprises a) acidifying an aqueous solution or suspension of an anionic organic compound containing salts and/or impurities to a pH of 4.5 or less, if the pH is above this value, so that b) the anionic organic compound is water-insoluble and precipitates in the form of the free acid, c) bringing the suspension to a salt content below 2 % by weight, based on the total weight of the retentate, by means of ultrafiltration with a membrane having pore diameters of from 0.001 to 0.02 mu m, and d) optionally washing out the salts with water having a pH below 4,5, e) optionally carrying out acid-free washing with water thereafter, and then f) concentrating, so that the amount of anionic organic compound is 5-50 % by weight, and g) if desired, bringing the anionic organic compound into solution by adding an appropriate base.
Inventors:
MALISZ JACEK (DE)
KAESER ADOLF (CH)
KAUFEL RAINER (DE)
LAUTENBACH HOLGER (DE)
POLLEY ELKE (DE)
HOFFMANN MARTINA (DE)
KAESER ADOLF (CH)
KAUFEL RAINER (DE)
LAUTENBACH HOLGER (DE)
POLLEY ELKE (DE)
HOFFMANN MARTINA (DE)
Application Number:
PCT/EP2001/005796
Publication Date:
April 04, 2002
Filing Date:
May 21, 2001
Export Citation:
Assignee:
CIBA SC HOLDING AG (CH)
MALISZ JACEK (DE)
KAESER ADOLF (CH)
KAUFEL RAINER (DE)
LAUTENBACH HOLGER (DE)
POLLEY ELKE (DE)
HOFFMANN MARTINA (DE)
MALISZ JACEK (DE)
KAESER ADOLF (CH)
KAUFEL RAINER (DE)
LAUTENBACH HOLGER (DE)
POLLEY ELKE (DE)
HOFFMANN MARTINA (DE)
International Classes:
C09B29/045; C09B29/52; C09B57/00; C09B67/00; C09B67/26; C09B67/44; C09B67/54; D21H21/30; (IPC1-7): C09B67/54
Domestic Patent References:
| WO2001032786A1 | 2001-05-10 |
Foreign References:
| EP0652044A1 | 1995-05-10 | |||
| EP0992547A2 | 2000-04-12 | |||
| EP0802240A2 | 1997-10-22 | |||
| EP0278320A2 | 1988-08-17 | |||
| EP0197006A2 | 1986-10-08 | |||
| EP0049802A1 | 1982-04-21 | |||
| EP0302015A2 | 1989-02-01 | |||
| DE4108596A1 | 1991-09-26 | |||
| EP0287515A1 | 1988-10-19 | |||
| DE4116522A1 | 1991-11-28 | |||
| EP0505870A1 | 1992-09-30 |
Download PDF:
Previous Patent: IMPREGNATION SEALANTS UTILIZING HYDROSILATION CHEMISTRY
Next Patent: POLYAMIDE BASED ANTIBACTERIAL POWDER PAINT COMPOSITION
Next Patent: POLYAMIDE BASED ANTIBACTERIAL POWDER PAINT COMPOSITION