Patent · US Expired

Method for separating vaporous phthalic acid anhydride from a gas stream

US6368389B1 · kind B1 · utility

15Cited by

8References

8Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Gerhard Birke · Frankfurt am Main, DE
Martin Hirsch · Friedrichsdorf, DE
Volker Franz · Frankfurt am Main, DE

Key dates

Filing date	May 18, 2000
Grant date	Apr 9, 2002
Priority date	—
Expiry date	May 18, 2020

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2208/00274
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Phthalic acid anhydride is recovered from a gas stream containing phthalic acid anhydride vapors by passing the gas stream upwardly through a vertical tube so that the gases expand at the orifice at the upper end of the tube and mix with granules entrained above the tube by fluidizing gas of a fluidized bed of phthalic acid anhydride granules around the tube. The tube, kept free from phthalic acid anhydride granules and the fluidized bed, is indirectly cooled.

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