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:
Feb. 14, 2012
Filed:
Jun. 13, 2008
Hyun-kuk Noh, Daejeon, KR;
Hyun-jong Shin, Gwangju, KR;
Won-ho Lee, Daejeon, KR;
Byung-yul Choi, Naju-si, KR;
Gyo-hyun Hwang, Daejeon, KR;
Ju-yeon Park, Gwangju, KR;
Duk-ki Kim, Gwangju, KR;
Young-hyun Choe, Naju-si, KR;
Min-ho Kil, Daejeon, KR;
Min-suk Kim, Daejeon, KR;
Young-jin Cho, Naju-si, KR;
Sung-chul Lim, Daejeon, KR;
Hyun-Kuk Noh, Daejeon, KR;
Hyun-jong Shin, Gwangju, KR;
Won-ho Lee, Daejeon, KR;
Byung-yul Choi, Naju-si, KR;
Gyo-hyun Hwang, Daejeon, KR;
Ju-yeon Park, Gwangju, KR;
Duk-ki Kim, Gwangju, KR;
Young-hyun Choe, Naju-si, KR;
Min-ho Kil, Daejeon, KR;
Min-suk Kim, Daejeon, KR;
Young-jin Cho, Naju-si, KR;
Sung-chul Lim, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
The present invention relates to a method of preparing a heteropoly acid catalyst used for the production of methacrylic acid by gas phase oxidation of methacrolein, more precisely a method of preparing a heteropoly acid catalyst comprising the steps of preparing a slurry by adding metal precursors and ammonium salt to protonic acid Keggin-type heteropoly acid aqueous solution and stirring thereof; and drying, molding and firing the slurry to give a catalyst. The present invention provides a method of preparing a heteropoly acid catalyst exhibiting high methacrolein conversion rate and methacrylic acid selectivity without pre-firing process by using high purity protonic acid Keggin-type heteropoly acid and ammonium salt.