Patent · US Expired

Process for the removal of ammonium sulphate from tarrich waste streams from the production of (meth) acrylonitrile

US5141732A · kind A · utility

3Cited by

2References

9Claims

0Family size

Assignee

EC Erdolchemie GmbH · DE

Inventors

Hans-Jurgen Haardt · Pulheim, DE
Jens Herwig · Cologne, DE
Ernst-Friedrich Neeb · Dormagen, DE

Key dates

Filing date	Apr 4, 1991
Grant date	Aug 25, 1992
Priority date	—
Expiry date	Apr 4, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C253/34
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The ammonium sulphate contained in tar-rich waste streams from the production of (meth)acrylonitrile can be precipitated out by adding 1 to 30 times the amount by weight of methanol, relative to the water content of the waste stream, and additionally 0.05 to 10% the amount by weight of ammonia, relative to methanol, to such a waste stream at 10.degree.-60.degree. C. and separating off the ammonium sulphate which precipitates out. The waste stream remaining after separating off the ammonium sulphate can, for example, be disposed of as low-sulphur waste-fuel in a combustion chamber.

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