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    PROCESS FOR METHACRYLIC ACID PRODUCTION
    1.
    发明公开
    PROCESS FOR METHACRYLIC ACID PRODUCTION 审中-公开

    公开(公告)号：US20240327327A1

    公开(公告)日：2024-10-03

    申请号：US18698840

    申请日：2022-10-05

    Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

    Inventor： Daniel A. Bors ,  Reetam Chakrabarti ,  Kirk W. Limbach

    IPC: C07C51/235 ,  B01J23/52

    CPC classification number: C07C51/235 ,  B01J23/52

    Abstract: A process for producing methacrylic acid comprising: a) producing methacrolein from propionaldehyde and formaldehyde; b) producing methacrylic acid in an oxidative reaction from the methacrolein produced in step a) and water. Step b) is performed at a pressure above 1 bar. Step c) is performed in a reactor system in a liquid phase reaction in the presence of a heterogeneous noble metal-containing catalyst, where the reactor system comprises an oxygen-containing gas. An average concentration of methacrolein in step b) is less than 40 wt % based on the total weight of water and methacrolein. The reactor system of step b) has an average ratio of water to methacrolein less than 40:1 based on an average amount of water and methacrolein entering and exiting the system.

    ALDEHYDE BYPRODUCT REDUCTION IN ACRYLIC ACID PRODUCTION USING HIGHLY ACTIVE AND ELECTIVE CATALYSTS
    2.
    发明申请
    ALDEHYDE BYPRODUCT REDUCTION IN ACRYLIC ACID PRODUCTION USING HIGHLY ACTIVE AND ELECTIVE CATALYSTS 有权

    公开(公告)号：US20220193640A1

    公开(公告)日：2022-06-23

    申请号：US17601751

    申请日：2020-04-20

    Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

    Inventor： Jinsuo Xu ,  Nelson I. Quiros ,  Daniel A. Bors ,  Joseph F. Dewilde

    IPC: B01J23/652 ,  B01J23/00 ,  B01J23/28 ,  C07C51/16 ,  C07C45/28

    Abstract: A catalyst composition comprises an acrolein-oxidizing catalyst comprising a mixed metal oxide catalyst of general formula (1): MoVaA1bA2cA3dOm  (I) in which A1 comprises at least one element selected from the group consisting of W and Cu; A2 comprises at least one element selected from the group consisting of Sb, Fe, and Nb; A3 comprises at least one element selected from the group consisting of Y, Ti, Zr, Hf, Ta, Cr, Mn, Re, Ru, Co, Rh, Ir, Ni, Pd, Pt, Ag, Au, Zn, B, Al, Ga, In, Ge, Sn, Si, Te, Pb, P, As, Bi, Se, rare earth elements, alkaline elements, and alkaline earth elements; a ranges from 0.01 to 1.0; b ranges from 0.01 to 1.5; c ranges from 0 to 1.5; d ranges from 0 to 1.0; and m is dependent on the oxidation state of the other elements. The catalyst composition further comprises a finishing catalyst comprising a mixed metal oxide catalyst of general formula (II): MoVwNbxX1yX2zOn  (II) in which X1 comprises at least one element selected from the group consisting of Te and Sb; X2 comprises at least one an element selected from the group consisting of Y, Ti, Zr, Hf, Nb, Ta, Cr, Mn, Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Ag, Au, Zn, B, Al, Ga, In, Ge, Sn, Pb, P, As, Bi, Se, rare earth elements and alkaline earth elements; w ranges from 0.01 to 1.0; x ranges from 0.01 to 1.0; y ranges from 0.01 to 1.0; z ranges from 0 to 1.0; and n is depended on the oxidation state of the other elements. The finishing catalyst does not contain W or Cu, and has an X-ray diffraction pattern showing an orthorhombic phase as the major crystal phase with main peaks with 2θ at 6.7°, 7.8°, 22.1°, and 27.2°. The acrolein-oxidizing catalyst has a different chemical composition than the finishing catalyst. A process for producing acrylic acid is also disclosed.

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