公开(公告)号：US20200157036A1

公开(公告)日：2020-05-21

申请号：US16632560

申请日：2018-06-25

Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

Inventor： Dmitry A. Krapchetov ,  James Elder ,  William G. Worley ,  Kirk W. Limbach ,  Daniel A. Hickman ,  Alexey Kirilin ,  Wen Sheng Lee ,  Victor Sussman

IPC: C07C67/44 ,  B01J37/02 ,  B01J35/08 ,  B01J21/04 ,  B01J35/00 ,  B01J21/06 ,  B01J23/52 ,  B01J35/02

Abstract: A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.

公开(公告)号：US10829435B2

公开(公告)日：2020-11-10

申请号：US16632560

申请日：2018-06-25

Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

Inventor： Dmitry A. Krapchetov ,  James Elder ,  William G. Worley ,  Kirk W. Limbach ,  Daniel A. Hickman ,  Alexey Kirilin ,  Wen Sheng Lee ,  Victor Sussman

IPC: C07C67/44 ,  B01J21/04 ,  B01J21/06 ,  B01J23/52 ,  B01J35/00 ,  B01J35/02 ,  B01J35/08 ,  B01J37/02

Abstract: A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.

公开(公告)号：US12098124B2

公开(公告)日：2024-09-24

申请号：US17600764

申请日：2020-04-02

Applicant: Rohm and Haas Company

Inventor： Reetam Chakrabarti ,  Minh N. Ngo ,  James Elder

IPC: C07C67/08 ,  B01D3/14 ,  B01J27/02 ,  B01J31/02 ,  C07C67/54 ,  C07C67/58 ,  C07C69/54

CPC classification number: C07C67/08 ,  B01D3/146 ,  B01J27/02 ,  B01J31/0225 ,  C07C67/54 ,  C07C67/58 ,  C07C69/54

Abstract: A method for preparing methyl acrylate comprises:



a) heating in a reaction zone a mixture comprising acrylic acid, methanol, and an acid catalyst to react and form a reaction product comprising methyl acrylate which is vaporized with other light components and then fed to a distillation zone, wherein a feed stream entering the reaction zone comprises methanol to acrylic acid in a molar ratio of greater than 1 and less than 2, and a residence time in the reaction zone ranges from 0.25 to 2 hours;
b) condensing and phase-separating a distillate from the distillation zone to form an organic phase comprising methyl acrylate and an aqueous phase;
c) returning a portion of the organic phase to the distillation zone as organic reflux; and
d) feeding the remainder of the organic phase and the aqueous phase of the distillation zone to an extraction column to form a methanol rich aqueous effluent and an organic effluent comprising methyl acrylate.

公开(公告)号：US12065403B2

公开(公告)日：2024-08-20

申请号：US17601094

申请日：2020-04-02

Applicant: Rohm and Haas Company

Inventor： Reetam Chakrabarti ,  Minh N. Ngo ,  James Elder

IPC: C07C67/08 ,  B01D3/14 ,  B01D3/40 ,  B01D5/00 ,  C07C67/54 ,  C07C67/58 ,  C07C69/54

CPC classification number: C07C67/08 ,  B01D3/146 ,  B01D3/40 ,  B01D5/006 ,  C07C67/54 ,  C07C67/58 ,  C07C69/54

Abstract: A method for preparing methyl acrylate comprises heating in a reaction zone a mixture comprising acrylic acid, methanol, and an acid catalyst to react and form a reaction product comprising methyl acrylate which is vaporized with other light components and then fed to a distillation zone. A feed stream entering the reaction zone comprises methanol and acrylic acid in a molar ratio of greater than 1 and less than 2, and a residence time in the reaction zone ranges from 0.25 to 2 hours. A distillate from the distillation zone is condensed and phase-separated to form an organic phase comprising methyl acrylate and an aqueous phase. A portion of the organic phase is returned to the distillation zone as organic reflux. The remainder of the organic phase and the aqueous phase of the distillation zone is fed to an extraction column to form a methanol rich aqueous effluent and an organic effluent comprising methyl acrylate. The organic effluent from the extraction column is purified in a single finishing column, wherein a light ends stream is removed from the top of the finishing column, a bottoms stream is removed from the bottom of the finishing column, and methyl acrylate is removed from a side draw stream.

公开(公告)号：US20220162149A1

公开(公告)日：2022-05-26

申请号：US17600764

申请日：2020-04-02

Applicant: Rohm and Haas Company

Inventor： Reetam Chakrabarti ,  Minh N. Ngo ,  James Elder

IPC: C07C67/08 ,  C07C67/54 ,  B01J31/02 ,  B01J27/02

Abstract: A method for preparing methyl acrylate comprises: a) heating in a reaction zone a mixture comprising acrylic acid, methanol, and an acid catalyst to react and form a reaction product comprising methyl acrylate which is vaporized with other light components and then fed to a distillation zone, wherein a feed stream entering the reaction zone comprises methanol to acrylic acid in a molar ratio of greater than 1 and less than 2, and a residence time in the reaction zone ranges from 0.25 to 2 hours; b) condensing and phase-separating a distillate from the distillation zone to form an organic phase comprising methyl acrylate and an aqueous phase; c) returning a portion of the organic phase to the distillation zone as organic reflux; and d) feeding the remainder of the organic phase and the aqueous phase of the distillation zone to an extraction column to form a methanol rich aqueous effluent and an organic effluent comprising methyl acrylate.

公开(公告)号：US20220153679A1

公开(公告)日：2022-05-19

申请号：US17601094

申请日：2020-04-02

Applicant: Rohm and Haas Company

Inventor： Reetam Chakrabarti ,  Minh N. Ngo ,  James Elder

IPC: C07C67/08 ,  C07C67/54 ,  B01D3/14 ,  B01D3/40 ,  B01D5/00

Abstract: A method for preparing methyl acrylate comprises heating in a reaction zone a mixture comprising acrylic acid, methanol, and an acid catalyst to react and form a reaction product comprising methyl acrylate which is vaporized with other light components and then fed to a distillation zone. A feed stream entering the reaction zone comprises methanol and acrylic acid in a molar ratio of greater than 1 and less than 2, and a residence time in the reaction zone ranges from 0.25 to 2 hours. A distillate from the distillation zone is condensed and phase-separated to form an organic phase comprising methyl acrylate and an aqueous phase. A portion of the organic phase is returned to the distillation zone as organic reflux. The remainder of the organic phase and the aqueous phase of the distillation zone is fed to an extraction column to form a methanol rich aqueous effluent and an organic effluent comprising methyl acrylate. The organic effluent from the extraction column is purified in a single finishing column, wherein a light ends stream is removed from the top of the finishing column, a bottoms stream is removed from the bottom of the finishing column, and methyl acrylate is removed from a side draw stream.