Patent · US Expired

Process for separating and purifying substances by crystallization from the melt under high pressure

US5447541A · kind A · utility

1Cited by

1References

2Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Rudolf Steiner · Bassersdorf, CH
Axel Konig · Wemmel, BE
Siegbert Rittner · Mörfelden, DE

Key dates

Filing date	Apr 20, 1994
Grant date	Sep 5, 1995
Priority date	—
Expiry date	Apr 20, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/392
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Process for separating and purifying substances by crystallization from the melt under high pressures In the process for separating or purifying substances by crystallization from melts or highly concentrated solutions under high pressures, gas is dissolved in the melt to be crystallized and is expelled again after the crystallization with reduction in the pressure. Still adhering or occluded impurities are thus removed.

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