Method for producing sec-butyl alcohol through continuous hydrolysis
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A technology for catalyzed hydrolysis of sec-butanol, applied in hydrolysis preparation, separation methods, chemical instruments and methods, etc., can solve the problem of low conversion rate
Active Publication Date: 2018-04-13
FUZHOU UNIV
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[0005] Aiming at the problem of low conversion rate in the existing technology for preparing sec-butanol by hydrolysis of sec-butyl acetate, the present invention provides a method for producing sec-butanol by continuous hydrolysis
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Embodiment 1
[0029] The feed molar ratio of sec-butyl acetate to water in the reactive distillation column is 2, the reflux ratio is 2, the operating pressure is 0.2MPa, and the temperature is 100°C; the operating pressure in the vacuum distillation column is 5kPa, and the reflux ratio is 2 , The operating pressure in the pressurized rectification tower is 0.6MPa, and the reflux ratio is 2.
[0030] In this example, the hydrolysis conversion rate of sec-butyl acetate was 43.17%, the purity of sec-butanol was 99.97%, and the yield of sec-butanol was 90.82%.
Embodiment 2
[0032] The feed molar ratio of sec-butyl acetate to water in the reactive distillation column is 5, the reflux ratio is 8, the operating pressure is 0.3MPa, and the temperature is 110°C; the operating pressure in the vacuum distillation column is 10kPa, and the reflux ratio is 5 , The operating pressure in the pressurized rectification tower is 1.0MPa, and the reflux ratio is 5.
[0033] In this example, the hydrolysis conversion rate of sec-butyl acetate was 66.53%, the purity of sec-butanol was 99.97%, and the yield of sec-butanol was 94.40%.
Embodiment 3
[0035] The feed molar ratio of sec-butyl acetate to water in the reactive distillation column is 5, the reflux ratio is 10, the operating pressure is 0.5MPa, and the temperature is 120°C; the operating pressure in the vacuum distillation column is 50kPa, and the reflux ratio is 8 , The operating pressure in the pressurized rectification tower is 1.3MPa, and the reflux ratio is 8.
[0036] In this example, the hydrolysis conversion rate of sec-butyl acetate was 70.88%, the purity of sec-butanol was 99.93%, and the yield of sec-butanol was 95.07%.
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Abstract
The invention discloses a method for producing sec-butyl alcohol through continuous hydrolysis, and belongs to the field of chemical reactions and separation. The method takes the sec-butyl acetate asa main material, the sec-butyl acetate is subjected to catalytic hydrolysis in a reaction section of a reactive distillation column through a catalyst, and the high-purity sec-butyl alcohol is obtained through the oil water separation and the three-step pressure swing distillation comprising pressure reduction, pressurization and pressure reduction. The reaction rectification-pressure swing distillation coupling process is adopted to hydrolyze the sec-butyl acetate, the conversion rate of hydrolysis is high, the purity of the sec-butyl alcohol is high, and the operation condition of the reaction is mild.
Description
technical field [0001] The invention belongs to the field of chemical reaction and separation, in particular to a method for producing sec-butanol by continuous hydrolysis. Background technique [0002] S-butanol is an important chemical organic intermediate, which is mostly used as a raw material for the preparation of methyl ethyl ketone. In addition, s-butanol can also be used as a surfactant, antioxidant, herbicide, etc. At present, the industrial production method of sec-butanol is mainly n-butene catalytic hydration method, but the catalytic hydration method has problems such as large environmental pollution, low single-pass conversion rate, high energy consumption and high equipment requirements. Other methods of producing sec-butanol include hydrogenation, transesterification, hydrolysis, etc. The hydrogenation method is to use butanone or sec-butyl acetate as raw materials to prepare sec-butanol under the catalysis of supported noble metal solid catalysts, etc., bu...
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