Patent · US Expired

Reduction of the phosphate content in waste water from the preparation of metal salts of ascorbic acid 2-monophosphate

US5582739A · kind A · utility

3Cited by

10References

6Claims

0Family size

Assignee

BASF SE

Inventors

Klaus Kaiser · Neustadt, DE
Joachim Paust · Schifferstadt, DE

Key dates

Filing date	Sep 27, 1993
Grant date	Dec 10, 1996
Priority date	—
Expiry date	Sep 27, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/906
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for reducing the phosphate content in waste water from the preparation of salts of ascorbic acid 2-monophosphate comprises A. treating the waste water from the crystallization of the metal salts of ascorbic acid 2-monophosphate with an alkali metal or alkaline earth metal hypochlorite, chlorine or H.sub.2 O.sub.2, and B. precipitating, at a pH of 9-12, the inorganic phosphate which has been produced from organically bound phosphorus and/or was present in the waste water, especially as calcium phosphate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.