Patent · US Expired

Process for preparing trioxane, polyoxymethylene and polyoxymethylene copolymers

US6653487B2 · kind B2 · utility

7Cited by

4References

4Claims

0Family size

Assignee

Ticona LLC · US

Inventors

Elke Schweers · Bad Soden, DE
Rolf Schulz · Dinslaken, DE
Thomas Kaiser · Kelkheim, DE
Uwe Dingerdissen · Seeheim-Jugenheim, DE

Key dates

Filing date	Jun 21, 2002
Grant date	Nov 25, 2003
Priority date	—
Expiry date	Jun 21, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2/10
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for preparing trioxane by converting methanol to formaldehyde by dehydrogenation at a temperature of 300 to 1000° C., in the presence of a catalyst, wherein the catalyst is generated physically separately from the reactor and at a temperature above the dehydrogenation temperature, and trimerizing the formaldehyde prepared in this way to give trioxane. Also described is a process for preparing polyoxymethylene and polyoxymethylene copolymers from the formaldehyde.

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