公开(公告)号：US20220314181A1

公开(公告)日：2022-10-06

申请号：US17289352

申请日：2020-10-28

Applicant: SHOWA DENKO K.K.

Inventor： Yasuhiro IWAMA ,  Maiko IKUSHIMA ,  Kazuki UMEHARA ,  Mitsuru TANAKA ,  Toshiyuki MAKI

IPC: B01J8/06 ,  B01J8/00 ,  C07C67/05

Abstract: A fixed-bed multi-tubular reactor for producing an alkenyl acetate by a gas phase catalytic oxidation reaction of a lower olefin, acetic acid and oxygen including a plurality of reaction tubes, a thermometer protection tube inserted into at least one of the plurality of reaction tubes, a thermometer inserted into the thermometer protection tube, and a shield disposed above the reaction tube into which the thermometer protection tube is inserted and attached to the thermometer protection tube, wherein an effective projection region of the shield entirely covers the inlet opening of the reaction tube into which the thermometer protection tube is inserted.

公开(公告)号：US20230398523A1

公开(公告)日：2023-12-14

申请号：US18035824

申请日：2021-08-03

Applicant: SHOWA DENKO K.K.

Inventor： Kazuhiro KITAGAWA ,  Yasuhiro HOSOGI ,  Yasuhiro IWAMA ,  Kazuki UMEHARA

IPC: B01J23/89 ,  B01J31/04 ,  B01J37/02 ,  B01J37/16 ,  C07C67/055

CPC classification number: B01J23/8926 ,  B01J31/04 ,  B01J37/024 ,  B01J37/0205 ,  B01J37/0207 ,  B01J37/16 ,  B01J37/0219 ,  B01J37/0217 ,  C07C67/055

Abstract: A method for producing a vinyl acetate production catalyst containing a carrier, copper, palladium, gold, and an acetate, the method including in the following order: step 1) a step for impregnating the carrier with an alkaline solution; step 2) a step for contact-impregnating the carrier with a solution containing a compound containing copper, a compound containing palladium, and a compound containing gold; step 3) a step for performing reduction treatment; and step 4) a step for causing the carrier to carry the acetate.