Preparation method of catalyst for methyl difluoroacetate hydrogenation to produce difluoroethanol

[0019] A preparation method of a catalyst for preparing difluoroethanol by hydrogenating methyl difluoroacetate, comprising the following steps:

[0020] Step 1, by weight components, 2 parts of vanadium pentoxide (particle size 100 μm) and 2 parts of NbCl 3 Add it into a sodium hydroxide solution with a mass percentage of 6%, heat it to 30°C, then add 0.8 parts of polypropylene glycol and 1 part of tetraethyl orthosilicate under stirring, continue stirring for 20 minutes after the addition, and then remove the precipitate Filter, rinse with deionized water, and dry;

[0021] Step 2, in terms of weight components, add the dried solids in step 1 together with 2 parts of potassium oxide, 0.5 parts of calcium tungstate (particle size 100 μm), 1 part of zinc oxide and 6 parts of zeolite powder (particle size 500 μm) In 10 parts of calcium chloride saturated solution, stir and mix evenly, heat up to 50°C, add 1 part of potassium permanganate solution with a concentration of 7%, stir

[0023] A preparation method of a catalyst for preparing difluoroethanol by hydrogenating methyl difluoroacetate, comprising the following steps:

[0024] Step 1, by weight components, 3 parts of vanadium pentoxide (particle size 200 μm) and 3 parts of NbCl 3 Add it into a 7% potassium hydroxide solution by mass, heat it to 33°C, then add 1 part of polypropylene glycol and 2 parts of tetraethyl orthosilicate while stirring, continue stirring for 25 minutes after the addition, and then remove the precipitate Filter, rinse with deionized water, and dry;

[0025] Step 2, in terms of weight components, add the dried solids in step 1 together with 4 parts of potassium oxide, 0.6 parts of calcium tungstate (particle size 150 μm), 3 parts of zinc oxide and 8 parts of zeolite powder (particle size 600 μm) In 12 parts of calcium chloride saturated solution, stir and mix evenly, heat up to 52°C, add 1 part of potassium permanganate solution with a concentration of 5%, stir for 1 hour, cool

[0027] A preparation method of a catalyst for preparing difluoroethanol by hydrogenating methyl difluoroacetate, comprising the following steps:

[0028] Step 1, by weight components, 4 parts of vanadium pentoxide (particle size 100 μm) and 3 parts of NbCl 3 Add it into the sodium hydroxide solution with a mass percentage of 8%, heat it to 36°C, then add 1.5 parts of polypropylene glycol and 3 parts of tetraethyl orthosilicate under stirring, continue stirring for 30 minutes after the addition, and then remove the precipitate Filter, rinse with deionized water, and dry;

[0029] Step 2, in terms of weight components, add the dried solids in step 1 together with 5 parts of potassium oxide, 0.8 parts of calcium tungstate (particle size 100 μm), 5 parts of zinc oxide and 12 parts of zeolite powder (particle size 700 μm) In 18 parts of calcium chloride saturated solution, stir and mix evenly, heat up to 60°C, add 2 parts of potassium permanganate solution with a concentration of 6%,