Patent · US Expired

Process for separating and purifying substances by crystallization from the melt

US5447542A · kind A · utility

1Cited by

1References

3Claims

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

In the process for separating and purifying substances by crystallization from the melt under pressure, the melt is subjected to pressure under an inert gas atmosphere and then cooled, whereupon it crystallizes. The residual melt is separated from the resulting crystals, after which the crystals are degassed by reducing the pressure and are caused to sweat, and the sweat oil is separated off.

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