Patent · US Expired

Ultrapurification of organic solvents

US6059857A · kind A · utility

14Cited by
33References
19Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 24, 1998
Grant dateMay 9, 2000
Priority date
Expiry dateNov 24, 2018

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB01D53/229
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A system for the ultrapurification of organic solvents comprising (1) a membrane-based vapor permeation step for selective removal of water vapor from the solvent, wherein a countercurrent sweep stream is used that has a particular partial pressure of water vapor, (2) a filtration step for selective removal of particulates, and (3) an ion exchange step for selective removal of ionic species.

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