Method for producing tetrahydrofuran
A technology of tetrahydrofuran and one-step method, which is applied in the field of one-step preparation of tetrahydrofuran, can solve the problems of weak dehydration ability and low selectivity of tetrahydrofuran, and achieve the effects of increasing productivity, high conversion rate and selectivity, and reducing production costs
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Embodiment 1
[0038] First, prepare 1mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a water bath at 80°C Add the mixed solution dropwise to the sodium carbonate solution, stir, stop the dropwise addition when the pH value is 7 to 8, add a certain amount of β molecular sieve (making the content of the molecular sieve be 10% of the total weight of the catalyst), aging for 12h, filter, Washing, drying at 110° C. for 12 hours, and calcining at 450° C. for 4 hours to obtain a CuO-ZnO / β molecular sieve catalyst (the content ratio of each component of the catalyst is 45 / 45 / 10).
[0039] Fill the CuO-ZnO / β molecular sieve catalyst prepared above in a fixed-bed reactor, and use dimethyl maleate as a raw material to carry out gas-phase hydrogenation reaction; the process conditions are: temperature 190°C, pressure 4.0MPa, hydrogen / The ester molar ratio is 100:1,...
Embodiment 2
[0041] First, prepare 1mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a water bath at 80°C The mixed solution was added dropwise to the sodium carbonate solution, stirred, and the dropwise addition was stopped when the pH value was 7 to 8, and a certain amount of Y molecular sieve was added (the content of Y molecular sieve was 10% of the total weight of the catalyst), aged for 12h, filtered, and washed , dried at 110°C for 12h, and calcined at 450°C for 4h to obtain a CuO-ZnO / Y molecular sieve catalyst (the content ratio of each component is 45 / 45 / 10).
[0042] Fill the CuO-ZnO / Y catalyst prepared above in a fixed-bed reactor, and use dimethyl maleate as a raw material to carry out gas-phase hydrogenation reaction; the process conditions are: temperature 190°C, pressure 4.0MPa, hydrogen / ester The molar ratio is 100:1, and the liquid weigh...
Embodiment 3
[0044] First, prepare 1mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a water bath at 80°C The mixed solution is added dropwise to the sodium carbonate solution, stirred, and the dropwise addition is stopped when the pH value is 7 to 8, and a certain amount of Y molecular sieve is added (the content of Y molecular sieve is 20% of the total weight of the catalyst), aged for 12h, filtered, and washed , dried at 110°C for 12h, and calcined at 450°C for 4h to obtain a CuO-ZnO / Y molecular sieve catalyst (the content ratio of each component is 40 / 40 / 20).
[0045] Fill the CuO-ZnO / Y catalyst prepared above in a fixed-bed reactor, and use dimethyl maleate as a raw material to carry out gas-phase hydrogenation reaction; the process conditions are: temperature 190°C, pressure 4.0MPa, hydrogen / ester The molar ratio is 100:1, and the liquid weight spa...
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