公开(公告)号：WO2021191414A1

公开(公告)日：2021-09-30

申请号：PCT/EP2021/057894

申请日：2021-03-26

Applicant: BASF SE

Inventor： KARPOV, Andrey ,  WALSDORFF, Christian ,  JOHANN, Thorsten ,  ALMER, Christian ,  RIECK, Daniela ,  BARTOSCH, Christian ,  GROBYS, Mauricio ,  WEINLAND, Tobias ,  BORCHERT, Holger

IPC: B01J23/68 ,  B01J23/50 ,  B01J37/02 ,  B01J37/16 ,  B01J37/14 ,  C07D301/00 ,  B01J23/688 ,  B01J37/0203 ,  B01J37/0205

Abstract: A process for producing a silver-based epoxidation catalyst, comprising i) impregnating a particulate porous refractory support with a first aqueous silver impregnation solution comprising silver ions and an aminic complexing agent selected from amines, alkanolamines and amino acids; ii) converting at least part of the silver ions impregnated on the refractory support to metallic silver by heating while directing a stream of a first gas over the impregnated refractory support to obtain an intermediate catalyst, wherein the first gas comprises at least 5 vol.-% oxygen; iii) impregnating the intermediate catalyst with a second aqueous silver impregnation solution comprising silver ions, an aminic complexing agent selected from amines, alkanolamines and amino acids, and one or more transition metal promoters, in particular rhenium; and iv) converting at least part of the silver ions impregnated on the intermediate catalyst to metallic silver by heating while directing a stream of a second gas over the impregnated intermediate catalyst to obtain the epoxidation catalyst, wherein the second gas comprises at most 2.0 vol.-% oxygen, wherein the impregnated refractory support and the impregnated intermediate catalyst are each heated to a temperature of 200 to 800 °C. The process of the invention surprisingly allows for obtaining a catalyst with high selectivity in a cost-efficient manner. The invention also relates to a silver-based epoxidation catalyst obtainable by such a process, and to a process for producing an alkylene oxide by gas-phase oxidation of an alkylene, comprising reacting an alkylene and oxygen in the presence of a silver-based epoxidation catalyst obtainable by the above process.

公开(公告)号：WO2022161924A1

公开(公告)日：2022-08-04

申请号：PCT/EP2022/051551

申请日：2022-01-25

Applicant: BASF SE

Inventor： KARPOV, Andrey ,  ALMER, Christian ,  WALSDORFF, Christian ,  LEHR, Andreas ,  NIKOLAY, Michael ,  BARTOSCH, Christian ,  GROBYS, Mauricio

IPC: B01J23/68 ,  B01J37/02 ,  B01J21/04 ,  B01J35/02 ,  B01J35/10 ,  C07D301/10

Abstract: An epoxidation catalyst comprising silver, cesium, rhenium and tungsten deposited on an alumina support, wherein the catalyst comprises 20 to 50 wt.-% of silver, relative to the weight of the catalyst, an amount of cesium Ccs of at least 7.5 mmol per kg of catalyst, and an amount of rhenium CR6 and an amount of tungsten Cw so as to meet the following requirements: CRe ≥ 6.7 mmol per kg of catalyst; and CRe + (2 χ cw) ≥ 13.2 mmol per kg of catalyst. The epoxidation catalyst allows for a more efficient conversion of ethylene oxide by gas-phase oxidation of ethylene, particularly displaying high selectivity and high activity. The invention also relates to a process for preparing an epoxidation catalyst as defined in above, comprising i) impregnating an alumina support with a silver impregnation solution; and ii) subjecting the impregnated refractory support to a calcination process; wherein steps i) and ii) are optionally repeated, and at least one silver impregnation solution comprises rhenium, tungsten and cesium. The invention moreover relates to a process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising reacting ethylene and oxygen in the presence of an epoxidation catalyst according to any one of the preceding claims.

公开(公告)号：WO2021038027A1

公开(公告)日：2021-03-04

申请号：PCT/EP2020/074057

申请日：2020-08-28

Applicant: BASF SE

Inventor： KARPOV, Andrey ,  RUETTINGER, Wolfgang ,  WALSDORFF, Christian ,  BARTOSCH, Christian ,  GROBYS, Mauricio

IPC: B01J21/04 ,  B01J23/50 ,  B01J23/68 ,  B01J35/00 ,  B01J35/02 ,  B01J35/04 ,  B01J35/10 ,  B01J37/00 ,  B01J37/02

Abstract: A process for preparing a catalyst for producing ethylene oxide by gas-phase oxidation of ethylene comprises i) impregnating a porous alumina support having a packed tube density in the range of 100 to 450 g/L; a Log differential pore volume distribution curve, 5 as measured by mercury porosimetry, having at least one peak in a pore diameter range of 0.01 to 5.0 µm; and a BET surface area in the range of 1.5 to 30.0 m2/g; with a silver impregnation solution, preferably under reduced pressure; and optionally subjecting the impregnated porous alumina support to drying; and ii) subjecting the impregnated porous alumina support to a calcination process; wherein steps i) and ii) are optionally repeated, 10 to yield a catalyst comprising at least 25 wt.-% of silver, relative to the total weight of the catalyst. The catalyst shows high activity and selectivity. The invention further relates to a catalyst for producing ethylene oxide by gas-phase oxidation of ethylene, obtainable by a process as defined above. The invention also relates to a catalyst for producing ethylene oxide by gas-phase oxidation of ethylene, comprising at least 25 wt.-% of silver, 15 relative to the total weight of the catalyst, deposited on a porous alumina support, the support having i) a packed tube density in the range of 100 to 450 g/L, preferably 150 to 450 g/L, more preferably 200 to 400 g/L; ii) a Log differential pore volume distribution curve, as measured by mercury porosimetry, having at least one peak in a pore diameter range of 0.01 to 5.0 µm; and iii) a BET surface area in the range of 1.5 to 30.0 m2/g, 20 preferably 1.5 to 20.0 m2/g, more preferably 2.0 to 10.0 m2/g, most preferably 2.5 to 8.0 m2/g, in particular 3.0 to 7.0 m2/g. The invention further relates to a process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising reacting ethylene and oxygen in the presence of a catalyst as defined above.