Patent · US Expired

Process for separating formaldehyde and trioxane

US5872263A · kind A · utility

1Cited by

2References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Michael Hoffmockel · Niedernhausen, DE
Karl-Friedrich Muck · Wiesbaden, DE
Gunter Sextro · Wiesbaden, DE

Key dates

Filing date	Apr 28, 1995
Grant date	Feb 16, 1999
Priority date	—
Expiry date	Apr 28, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C45/82
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for separating a gaseous reaction mixture in the preparation of trioxane is described, in which a) the gaseous mixture leaving the reactor is scrubbed in countercurrent with an organic solvent whose boiling point is above 135.degree. C. in which the trioxane predominantly dissolves and which leaves the formaldehyde predominantly in the gas phase which is returned to the reactor, b) the trioxane together with residual formaldehyde is stripped from the solvent by distillation via a column, the overhead product being partially condensed in the temperature range from 62.degree. to 100.degree. C. c) some of the resulting condensate is applied to the column as reflux and some is taken off as product and d) the non-condensed portion is returned to the scrubbing step a).

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