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. 02, 1990
Filed:
Jul. 19, 1989
David R Brackenridge, Baton Rouge, LA (US);
Ethyl Corporation, Richmond, VA (US);
Abstract
ar-Bromoaromatics having an alkenyl side chain on the aromatic nucleus are formed by feeding a beta-bromoalkyl-ar-bromoaromatic compound, together with a substantial excess of water, into a thermal dehydrobromination zone held at or above 475.degree. C., and maintaining a very short residence time (5 seconds or less) in the dehydrobromination zone. Very little extraneous co-products are formed. For example dibromostyrene was produced by co-feeding bromoethyldibromobenzene (BEDB) and excess amounts of water (using nitrogen as a carrier gas) into a Vycor tube packed with glass beads at 500.degree. C. By suitable controlling residence times, the amount of undesired coproducts formed was kept below 1.5 G. C. area %, and the percentage of BEDB conversion was in the range of 84.1% up to 99.1%.