The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 2002
Filed:
Apr. 27, 2001
Applicant:
Inventors:
Eckehard Danz, Ludwigshafen, DE;
Klaus Pandl, Hambrücken, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
B01J 1/000 ; C09K 1/506 ;
U.S. Cl.
CPC ...
B01J 1/000 ; C09K 1/506 ;
Abstract
The claimed invention relates to a process for preparing an aqueous formaldehyde solution comprising absorbing a formaldehyde-loaded gas stream, in an absorption zone, in an aqueous solution comprising from 0.000% to 0.01% by weight of a Bronsted base, based on the formaldehyde absorbed. The produced aqueous formaldehyde solution comprises: a) from 10 to 75% by weight of formaldehyde, b) from 0 to 500 ppm by weight of tetroxane, c) from 50 to 400 ppm by weight of formic acid, based on the formaldehyde absorbed, and d) from 0.2 to 5.0% by weight of methanol, based on the formaldehyde absorbed.