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Preparation method of 2-butyl alcohol

A technology of sec-butanol and sec-butyl acetate, which is applied in the field of preparation of sec-butanol, can solve the problems of poor high temperature resistance of resin catalysts, low per-pass conversion rate of n-butene, serious equipment corrosion, etc., and meet the requirements of low production equipment , Reduce equipment corrosion and environmental pollution, high conversion rate effect

Inactive Publication Date: 2013-03-27
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this process are that a large amount of dilute acid is produced in the production process, the equipment is seriously corroded, there are many three wastes, and the equipment investment is relatively large
However, the disadvantage of this process is that the raw material n-butene is required to be higher, and the n-butene content in the C4 fraction is generally required to be higher than 90%; moreover, the resin catalyst has poor high temperature resistance, short life, and is easy to deactivate. The conversion rate of ene per pass is low (usually below 10%)
However, the disadvantage of this process is that the single-pass conversion rate of n-butene is low, and the reaction needs to be carried out under high pressure and high temperature

Method used

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preparation example Construction

[0011] The preparation method of said sec-butanol according to the present invention comprises: in the presence of a transesterification catalyst, adding sec-butyl acetate and lower carbon alcohol into a catalytic rectification tower for transesterification, collecting sec-butyl alcohol from the tower bottom liquid Butanol, wherein the lower alcohol is C1-C3 alcohol.

[0012] According to the method of the present invention, in order to further improve the conversion rate of sec-butyl acetate and the selectivity of sec-butanol, the operation process of the transesterification reaction preferably comprises: the sec-butyl acetate, low-carbon The mixture of alcohol and transesterification catalyst is heated to boiling, and under the condition of full reflux, reacts to the tower top temperature and reaches the azeotropic point of the lower alcohol and the lower alcohol ester of acetate, and then in the reflux ratio of 2-5:1 Under conditions, the azeotrope of the lower alcohol and ...

Embodiment 1

[0024] This embodiment is used to illustrate the preparation method of the sec-butanol of the present invention.

[0025] Add sec-butyl acetate and methanol to the catalytic rectification column (the number of trays is 50 pieces) with molar ratio as 1:4, relative to the add-on amount of sec-butyl acetate of 100 parts by weight, add 2 parts by weight Sodium methoxide is used as a catalyst. Under normal pressure, the material in the catalytic rectification tower is fully refluxed under heating. After the top temperature reaches 54°C (the azeotropic point of methanol and methyl acetate), the extraction begins, and the reflux is controlled. The ratio is 5:1, so that the azeotrope of methanol and methyl acetate is distilled from the top of the tower; when the temperature of the top of the tower rises to 64 ° C (the boiling point of methanol), the liquid in the bottom of the tower is distilled and separated to collect sec-butanol .

[0026] It is known by calculation that the conve...

Embodiment 2

[0028] This embodiment is used to illustrate the preparation method of the sec-butanol of the present invention.

[0029] Add sec-butyl acetate and ethanol to the catalytic rectification column (the number of trays is 50) with molar ratio as 1:4, with respect to the add-on amount of sec-butyl acetate of 100 parts by weight, add 2 parts by weight therein The ZSM-5 molecular sieve (purchased from Nanjing Jicang Nano Technology Co., Ltd.) is used as a catalyst, under normal pressure, the material in the catalytic rectification tower is fully refluxed under heating, and the temperature at the top of the tower reaches 72 ° C (ethanol and acetic acid After the azeotropic point of ethyl acetate) start to withdraw, the control reflux ratio is 3: 1, so that the azeotrope of ethanol and ethyl acetate is distilled from the top of the tower; when the temperature of the top of the tower rises to 78 ° C (the boiling point of ethanol) , Distill and separate the tower bottom liquid to collect...

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Abstract

The invention relates to a preparation method of 2-butyl alcohol. The method comprises the following steps: carrying out an ester exchange reaction of 2-butyl acetate and low-carbon alcohol in a catalytic rectifying tower in the presence of an ester exchange catalyst, and collecting the 2-butyl alcohol from tower bottoms, wherein the low-carbon alcohol is C1-C3 alcohol. The method has the advantages of high 2-butyl acetate conversion rate and high 2-butyl alcohol selectivity.

Description

technical field [0001] The invention relates to a method for preparing sec-butanol. Background technique [0002] Sec-butanol (SBA) is used as a solvent in industry, and can be used as a component to increase the octane number of gasoline, and can be used to produce plasticizers, mineral dressing agents, herbicides, sec-butyl esters, etc. butanone, MEK). [0003] At present, the industrial production of sec-butanol is mainly n-butene hydration, mainly including indirect hydration with sulfuric acid as catalyst and direct hydration with ion exchange resin or heteropoly acid as catalyst. [0004] The sulfuric acid indirect hydration process technology is mature, the purity of the raw material n-butene is not strict, the reaction conditions are relatively mild, the process is simple, and the operation is easy to control. However, the disadvantages of this process are that a large amount of dilute acid is produced during the production process, the equipment is seriously corro...

Claims

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Application Information

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IPC IPC(8): C07C31/12C07C29/128
CPCY02P20/10
Inventor 衷晟黄华徐斌佘喜春谢琼玉
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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