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:
May. 13, 1997
Filed:
May. 15, 1995
Mohamed W Hisham, Grand Island, NY (US);
Mohan S Saran, Grand Island, NY (US);
Occidental Chemical Corporation, Niagara Falls, NY (US);
Abstract
Disclosed is a method of selecting a gas oil feedstock for use in manufacturing olefins. The feedstock is analyzed for the presence of benzothiophenes and is used to manufacture olefins only if it contains less than 50 ppm (as sulfur) of benzothiophenes. The concentration of benzothiophenes can be reduced by distilling the feedstock and removing the fraction of the feedstock that boils between about 45.degree. and about 60.degree. C. under reduced pressure of about 0.05 to about 0.1 mmHg. The concentration of benzothiophenes can also be reduced by passing the feedstock through a benzothiophene adsorber such as activated alumina or activated carbon.