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:
Feb. 05, 1991
Filed:
Oct. 10, 1989
Applicant:
Inventor:
Barbara C Stahly, Baton Rouge, LA (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
570195 ; 570194 ;
Abstract
A monoalkylaromatic hydrocarbon is haloethylated to a 1-halo-1-arylethane with minimal co-formation of diarylalkane and acetaldehyde by-products by reacting it with hydrogen chloride or bromide and a stoichiometric deficit of acetaldehyde in the presence of sulfuric acid in an amount such as to provide at least two mols of hydrogen sulfate per mol of acetaldehyde and less than 1.5 mols of hydrogen sulfate per mol of the monoalkylaromatic hydrocarbon.