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Method for synthetizing 2,3-butanediol

A technology of butanediol and butanol, applied in the chemical industry, can solve the problems of long fermentation period, low selectivity and complicated process of biological method technology, and achieve the effects of broad industrial application prospect, simple process and high selectivity.

Active Publication Date: 2013-07-10
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, biological technology has defects such as long fermentation period, complicated process, low yield, high cost and low selectivity, which seriously restrict the popularization and application of 2,3-butanediol synthesis technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ① Take 20% of A1 2 o 3 Mix the two evenly with 80% titanium-silicon molecular sieve catalyst, extrude, dry at 100 °C for 4 h, and roast at 500 °C for 4 h to obtain a titanium-silicon molecular sieve catalyst modified by aluminum oxide.

[0018] ② Dilute 15g of the catalyst prepared in step ① with 10g of quartz sand and put it in a fixed-bed reactor. The molar ratio of methanol, mixed C4 hydrocarbons and hydrogen peroxide is 40:1:1. Methanol and hydrogen peroxide are injected into the reactor with a metering pump, and the mixed C4 hydrocarbons are injected into the reactor through a metering pump. The three reactants are in contact with the modified titanium-silicon molecular sieve catalyst. Reaction, synthesis of 2,3-butanediol. Reaction conditions: reaction temperature 0 ℃, reaction pressure 0.5 Mpa, reaction bed liquid space velocity 60 h －1 . The obtained product was analyzed by chromatography, and the selectivity of 2,3-butanediol was 40.5%, and the conversion r...

Embodiment 2

[0020] Catalyst preparation is as shown in step ① of Example 1.

[0021] The catalyst is loaded in the slurry bed reactor, the total liquid volume is 3 liters, and the catalyst loading accounts for 5% of the total liquid volume. The molar ratio of ethanol, mixed C4 hydrocarbons and hydrogen peroxide is 40:10:1, reaction conditions: reaction temperature 60 ℃, reaction pressure 8.5 MPa, reaction bed liquid space velocity 10 h －1 , other steps are as in embodiment 1. The obtained product was analyzed by chromatography, and the selectivity of 2,3-butanediol was 41.8%, and the conversion rate of hydrogen peroxide was 99.5%.

Embodiment 3

[0023] Catalyst preparation is as shown in step ① of Example 1.

[0024] 10g of the prepared catalyst was diluted with 20g of quartz sand and placed in a continuous tube reactor. Reaction conditions: reaction temperature 80 ℃, reaction pressure 2.1 MPa, molar ratio of propanol, mixed C4 hydrocarbons and hydrogen peroxide is 1:1:1, reaction bed liquid space velocity 0.1 h －1 , other steps are with embodiment 1. The obtained product was analyzed by chromatography, and the selectivity of 2,3-butanediol was 39.5%, and the conversion rate of hydrogen peroxide was 99.1%.

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PUM

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Abstract

The invention discloses a method for synthetizing 2,3-butanediol. Alcohol, mixed C4 hydrocarbon and hydrogen peroxide are loaded in a reactor with a catalyst, the mixed C4 hydrocarbon and the hydrogen peroxide react so as to generate the 2,3-butanediol. The method is simple and has short cycle, the percent conversion of the hydrogen peroxide is high, and the selectivity of the 2,3-butanediol is high; and the whole process is easy to realize, the cost is low, and the industrialization application prospect is wide.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for synthesizing 2,3-butanediol. Background technique [0002] 2,3-Butanediol (CH 3 CHOHCHOHCH 3 , 2,3-butanediol, BD) is also known as 2,3-bishydroxybutane, dimethylene glycol, its molecule contains 2 chiral carbon atoms, and there are 3 optical isomers, which are D- (-)-2,3-Butanediol, L-(+)-2,3-Butanediol and meso-2,3-Butanediol. 2,3-Butanediol is an important chemical raw material and liquid fuel, widely used in chemical industry, food, aerospace fuel and other fields. Its high calorific value can be used as a fuel additive, and can also be used to prepare inks, perfumes, fumigants, moisturizers, softeners, plasticizers, explosives, and pharmaceutical chiral carriers. In my country, 2,3-butanediol is also added to liquor to improve the flavor of liquor. In addition, methyl ethyl ketone, the dehydration product of 2,3-butanediol, can be used as a solvent for ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/48
Inventor 李华王伟林榕伟包建国伍小驹阳清何驰剑高计皂
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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