Patent · US Expired

Process for the recovery of dimethylacylamides

US4177111A · kind A · utility

8Cited by

8References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Christian Pieper · Neuss, DE
Surinder S. Sandhu · Dormagen, DE
Gunter Schummer · Pulheim, DE
Karlheinz Feltgen · Dormagen, DE

Key dates

Filing date	Jun 23, 1977
Grant date	Dec 4, 1979
Priority date	—
Expiry date	Jun 23, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/09
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The recovery of dimethylacylamides from solutions which are formed during the production of fibres is particularly economical if the solution is concentrated in a separating column to produce a sump product having a DMA content of 30 to 90% at pressures of more than 300 Torr, using the evaporation heat of the head product for heating the column, with the aid of a compressor and then separating the sump product which is concentrated in DMA by distillation.

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