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:
Sep. 10, 2013
Filed:
Nov. 13, 2006
Hirofumi Ito, Higashiibaraki-gun, JP;
Kazunori Honda, Higashiibaraki-gun, JP;
Koji Oyama, Yokohama, JP;
Nobuyasu Chikamatsu, Yokohama, JP;
Kazutaka Hiraoka, Higashiibaraki-gun, JP;
Atsushi Okita, Higashiibaraki-gun, JP;
Hirofumi Ito, Higashiibaraki-gun, JP;
Kazunori Honda, Higashiibaraki-gun, JP;
Koji Oyama, Yokohama, JP;
Nobuyasu Chikamatsu, Yokohama, JP;
Kazutaka Hiraoka, Higashiibaraki-gun, JP;
Atsushi Okita, Higashiibaraki-gun, JP;
JGC Corporation, Tokyo, JP;
Abstract
Disclosed is a method for production of lower olefins from a raw material containing dimethyl ether (DME), which can produce lower olefins (e.g. propylene) with good yield and in an economically advantageous manner by prolonging the time until the reversible deactivation of a zeolite catalyst and preventing the irreversible deactivation of the catalyst, can reduce the amount of water to be recycled to increase the thermal efficiency of the process, and can simplify the facilities and operations. Also disclosed is a method for improving the yield of propylene with good efficiency under practical operating conditions. A feed gas which comprises a DME-containing feedstock gas and an additive gas and further contains steam at a specific proportion is introduced into an olefin synthesis reactor to contact the feed gas with a zeolite catalyst, thereby producing a hydrocarbon product containing C2-C5 olefins. Propylene or the like is separated/collected from the hydrocarbon product, and at least a part of the remainder is used as at least a part of the additive gas.