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:
Aug. 04, 2020
Filed:
Sep. 21, 2017
Lg Chem, Ltd., Seoul, KR;
Myung Ji Suh, Daejeon, KR;
Dong Hyun Ko, Daejeon, KR;
Jun Han Kang, Daejeon, KR;
Kyong Yong Cha, Daejeon, KR;
Ye Seul Hwang, Daejeon, KR;
Jun Kyu Han, Daejeon, KR;
Sang Jin Han, Daejeon, KR;
LG CHEM, LTD., Seoul, KR;
Abstract
A method of preparing butadiene that includes supplying butene, oxygen, nitrogen, and steam into a reactor filled with a metal oxide catalyst, and performing an oxidative dehydrogenation reaction at a temperature of 300 to 450° C. as a reaction step; after the reaction step, maintaining supplying the butene, oxygen, nitrogen, and steam within a range within which the flow rate change of the butene, oxygen, nitrogen, and steam is less than ±40%, or stopping supplying the butene, and cooling the reactor to a temperature range of 200° C. or lower and higher than 70° C. as a first cooling step; and after the first cooling step, stopping supplying the butene, oxygen, nitrogen, and steam or stopping at least supplying the butene, and cooling the reactor to a temperature of 70° C. or lower as a second cooling step.