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. 04, 2000
Filed:
Oct. 01, 1997
Francisco Jose Freire, Wilmington, DE (US);
Bruce Arthur Kaiser, Wilmington, DE (US);
Vinci Martinez Felix, Kennett Square, PA (US);
Dennie Turin Mah, Wilmington, DE (US);
James Arthur Trainham, Greenville, DE (US);
Clarence Garlan Law, Jr, West Trenton, NJ (US);
John Scott Newman, Kensington, CA (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process and a system produces isocyanate and converts anhydrous hydrogen chloride, which is a by-product of isocyanate production, to chlorine gas in an electrochemical cell. The chlorine is recycled to the isocyanate process. Any unreacted anhydrous hydrogen chloride may be recycled to the electrochemical cell. By recycling the anhydrous hydrogen chloride and the chlorine, the process and system are able to reduce the cost of producing isocyanate. In addition, this process and system process eliminate or at least substantially minimize the problems associated with disposal of anhydrous hydrogen chloride by turning it into a useful starting material in the isocyanate process.