Catalytic hydrogenation synthesis method for prenyl alcohol
A technology of isopentenol and hydrogenation catalysis, which is applied in the direction of chemical instruments and methods, isomerization preparation, hydroxyl compound preparation, etc., can solve the problems of shortening reaction time, reducing production cost, pollution, etc., and achieves shortening reaction time, The effect of reducing production cost and increasing reaction yield
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Embodiment 1
[0026] The invention provides a hydrogenation catalytic synthesis method of prenol, which comprises the following steps:
[0027] a. Under the action of a solid base catalyst, add paraformaldehyde with a concentration of 93%-97% and tert-butanol as a solvent to the reactor, and then inject nitrogen into the reactor to replace the air in the reactor, and then to the reactor Isobutylene is added to the mixture, after stirring, the reaction temperature is controlled at 180°C to 220°C, the reaction is continued for 3 to 5 hours, and then the cooling discharge distillation is performed;
[0028] b. Collect the prenol obtained by distillation;
[0029] c. Add the 3-methyl-3-butene-l-alcohol obtained by distillation into a fixed bed reactor, and at a temperature of 50℃~100℃, use Se and Ce promoted silica gel supported Pd catalyst to add Hydrogen catalyzed reaction to produce prenol.
[0030] Preferably, the temperature in step c is 70°C.
[0031] Preferably, the reaction kettle is a stainles...
Embodiment 2
[0038] Under the action of a solid catalyst, 95% paraformaldehyde and tert-butanol as a solvent are added to the reactor, nitrogen is injected into the reactor to replace the air in the reactor, and isobutylene is added to the reactor. When the reaction temperature is controlled at 200°C, the reaction is continued for 3 hours to 5 hours, and then the cooling discharge distillation is performed; the isopentenol obtained by the distillation is collected; the 3-methyl-3-butene obtained by the distillation is collected -l-alcohol is added to a fixed-bed reactor, and at a temperature of 50°C, a silica gel supported Pd catalyst promoted by Se and Ce is used to perform a hydrogenation catalytic reaction to obtain prenol.
[0039] Prenol is prepared by the above method. The 3-methyl-3-butene-1-alcohol obtained by distillation is added to a fixed bed reactor. At a temperature of 50°C, the reaction yield is 60%. The enol selectivity is 90%. The reaction yield and the selectivity of prenol...
Embodiment 3
[0041] Under the action of a solid catalyst, 95% paraformaldehyde and tert-butanol as a solvent are added to the reactor, nitrogen is injected into the reactor to replace the air in the reactor, and isobutylene is added to the reactor. When the reaction temperature is controlled at 200°C, the reaction is continued for 3 hours to 5 hours, and then the cooling discharge distillation is performed; the isopentenol obtained by the distillation is collected; the 3-methyl-3-butene obtained by the distillation is collected -l-alcohol is added to a fixed-bed reactor, and at a temperature of 100°C, a silica gel supported Pd catalyst promoted by Se and Ce is used to carry out a hydrogenation catalytic reaction to obtain prenol.
[0042] Prenol is prepared by the above method, and 3-methyl-3-butene-1-alcohol obtained by distillation is added to a fixed bed reactor. At a temperature of 100°C, the reaction yield is 58%. The enol selectivity is 88%. The reaction yield and the selectivity of pr...
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