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:
Jan. 31, 1978
Filed:
Dec. 12, 1969
Floyd E Bentley, Austin, TX (US);
Texaco Development Corporation, New York, NY (US);
Abstract
A predetermined 2,4'-isomer content in a polyamine reaction mixture resulting from the aniline/formaldehyde condensation reaction can be achieved. Aniline and formaldehyde can be condensed in the presence of solid acidic catalysts to form a mixture of the following amines: ##STR1## WHERE N IS AN INTEGER OF FROM 1 TO 3. The amount of 2,4'-isomer can be varied between 30 and 95 wt. % of the diamine component of the mixture by conducting the condensation reaction in the presence of an acid activated clay catalyst at a reaction temperature of about 80.degree. to about 300.degree. C. When the reaction is conducted in the presence of a silica-alumina cracking catalyst or a silica-magnesia catalyst, the 2,4'-isomer content can be varied from about 15 to about 50 wt. %. In using the latter class of catalyst it is possible to prevent formation of a secondary amine by conducting the condensation reaction at a lower temperature and then digesting at a temperature of from about 175.degree. to about 220.degree. C. for from about 1 to about 5 hours, depending upon the temperature used.