Preparation method of catalyst for synthesizing propionic acid by ethanol carbonylation, and application thereof
A catalyst and chemical synthesis technology, applied in the field of ethanol carbonylation reaction to prepare propionic acid, can solve the problems of surface active species scouring, active species loss, affecting catalyst life and performance, etc.
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Embodiment 1
[0015] The preparation method of the copolymer rhodium catalyst of ethanol carbonylation propionic acid, the steps are as follows:
[0016] (1) Preparation of catalyst ligand
[0017] Weigh 0.2mol of 2-vinylpyridine monomer and 0.05mol of acrolein methyl ester monomer and mix with 1.19g of azobisisobutyronitrile, add to 70ml of benzene solvent, and react at 60°C for 24 hours under stirring , cooled to room temperature, and precipitated with petroleum ether to obtain the copolymer ligand PVA-1.
[0018] (2) Preparation of catalyst
[0019] The PVA-1 copolymer that takes 1 weight part is dissolved in the acetic acid of 50 weight parts, after stirring and dissolving, add dichlorotetracarbonyl dirhodium, the addition is 3% of multipolymer by rhodium weight, reacts after 30 minutes, Ethanol was added to dissolve the sodium tetraphenylborate solution equimolar to rhodium, and the stirring was continued for 10 minutes. Precipitated with ether, and the catalyst obtained by f...
Embodiment 2
[0022] (1) Preparation of catalyst ligand
[0023] Weigh 0.2mol of 2-vinylpyridine monomer and 0.02mol of acrolein methyl ester monomer and mix with 0.23g of azobisisobutyronitrile, add to 70ml of benzene solvent, and react at 70°C for 10 hours under stirring , cooled to room temperature, and precipitated with petroleum ether to obtain the copolymer ligand PVA-2.
[0024] (2) Preparation of catalyst
[0025] The PVA-2 multipolymer that takes 1 weight part is dissolved in the acetic acid of 50 weight parts, after stirring and dissolving, add dichlorotetracarbonyl dirhodium, the addition is 5% of multipolymer by rhodium weight, reacts after 30 minutes, Ethanol was added to dissolve the sodium tetraphenylborate solution equimolar to rhodium, and the stirring was continued for 10 minutes. Precipitation with ether, and the catalyst obtained by filtration were marked as PVA-2-Rh.
[0026] To prepare propionic acid by catalyzing the carbonylation reaction of ethanol, put 45ml o...
Embodiment 3
[0028] (1) Preparation of catalyst ligand
[0029] Weigh 0.2mol of 2-vinylpyridine monomer and 0.10mol of acrolein methyl ester monomer and mix with 0.75g of azobisisobutyronitrile, add to 70ml of benzene solvent, and react at 65°C for 18 hours under stirring , cooled to room temperature, and precipitated with petroleum ether to obtain the copolymer ligand PVA-3.
[0030] (2) Preparation of catalyst
[0031] The PVA-3 multipolymer that takes 1 weight part is dissolved in the acetic acid of 50 weight parts, after stirring and dissolving, add dichlorotetracarbonyl dirhodium, the addition is 10% of multipolymer by rhodium weight, reacts after 30 minutes, Ethanol was added to dissolve the sodium tetraphenylborate solution equimolar to rhodium, and the stirring was continued for 20 minutes, and the catalyst was precipitated with ether, and the catalyst obtained by filtration was marked as PVA-3-Rh.
[0032] To prepare propionic acid by catalyzing the carbonylation reaction of eth...
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