公开(公告)号：US20210121856A1

公开(公告)日：2021-04-29

申请号：US17252884

申请日：2019-06-20

Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

Inventor： Kirk W. Limbach ,  Christopher D. Frick ,  Dmitry A. Krapchetov ,  Wen -Sheng Lee ,  Victor J. Sussman ,  Jeffrey A. Herron

IPC: B01J23/52 ,  B01J21/04 ,  B01J21/08 ,  B01J35/00 ,  C07C67/39

Abstract: A heterogeneous catalyst comprising a support and gold, wherein: (i) said support comprises alumina, (ii) said catalyst comprises from 0.1 to 5 wt % of gold, (iii) at least 90 wt % of the gold is in the outer 60% of catalyst volume, and (iv) particles of the catalyst have an average diameter from 200 microns to 30 mm; wherein weight percentages are based on weight of the catalyst.

公开(公告)号：US10745341B2

公开(公告)日：2020-08-18

申请号：US16634752

申请日：2018-06-25

Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

Inventor： Dmitry A. Krapchetov ,  Kirk W. Limbach ,  Daniel A. Hickman ,  Jeffrey Herron ,  Kurt W. Olson ,  D. Wayne Blaylock

IPC: C07C67/44 ,  B01J35/02 ,  B01J23/52 ,  B01J23/44 ,  B01J8/06 ,  B01J8/04 ,  C07C45/75 ,  C07C69/54

Abstract: A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a tubular reactor having at least four zones a mixture comprising methacrolein, methanol, oxygen and a base with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein reaction zones comprising catalyst beds alternate with mixing zones not comprising catalyst beds.

公开(公告)号：US20200148620A1

公开(公告)日：2020-05-14

申请号：US16632939

申请日：2018-06-25

Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

Inventor： Kirk W. Limbach ,  Dmitry A. Krapchetov ,  Christopher D. Frick ,  Daniel A. Hickman

IPC: C07C67/39

Abstract: A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein said catalyst has an average diameter of at least 200 microns, wherein oxygen concentration at a reactor outlet is from 0.5 to 7.5 mol % and wherein the reactor comprises a partition with the catalyst bed on a first side of the partition and with flow through the catalyst bed in a first direction and flow on a second side of the partition in an opposite direction.