Patent · US Expired

Generation of sulphur trioxide from oleum

US4663142A · kind A · utility

6Cited by
5References
5Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 21, 1985
Grant dateMay 5, 1987
Priority date—
Expiry dateNov 21, 2005

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC01B17/74
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A continuous process for the generation of sulphur trioxide from oleum suitable for use in the sulphonation of organic compounds which comprises continuously introducing oleum feed to a sulphur trioxide desorption tower; continuously introducing a recycled dry feed air stream to said desorption tower, whereby a gaseous mixture of sulphur trioxide in air is produced; collecting spent oleum from said desorption tower; introducing said gaseous mixture to a sulphonation reactor; and recycling spent gaseous mixture from said reactor to said desorption tower as said feed air stream. The process offers reduced environmental pollution and operating costs.

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