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Method for producing isobutyl acetate

A technology of isobutyl acetate and production method, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high labor intensity, difficult process control, large amount of waste water, etc. Short, easy to operate, less side effects

Active Publication Date: 2014-03-12
ZHEJIANG JIANYE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional production method of isobutyl acetate is acetic acid and isobutanol in a sulfuric acid catalyst (ie H 2 SO 4 , industrial applications are mainly 30%, 98% content) in the presence of intermittent esterification reaction, large energy consumption, small production capacity, low yield (≤85%), many side reactions, serious equipment corrosion, large amount of waste water , High labor intensity, difficult to control the process

Method used

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  • Method for producing isobutyl acetate
  • Method for producing isobutyl acetate
  • Method for producing isobutyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, a kind of production method of isobutyl acetate, the production device of the used isobutyl acetate mainly comprises esterification reactor, rectifying tower and phase separator.

[0023] The esterification reaction kettle is a stainless steel reaction tube, the ratio of its inner diameter to the total height: 1:1.3~2 (for example, inner diameter Φ=200mm, height 300mm). The steam source communicates with the esterification reactor through a pipeline with a valve (ie, a steam valve).

[0024] The acetic acid raw material tank for storing acetic acid and the isobutanol raw material tank for storing isobutanol are respectively communicated with the esterification reaction kettle after passing through respective flow meter regulating valves.

[0025] The above two flow meter regulating valves and steam valves can be connected with the signal of the DCS control system to realize automatic control.

[0026] Add composite catalyst 4.5g from the top position of e...

Embodiment 2

[0032] Embodiment 2, a kind of production method of isobutyl acetate, the production device of the used isobutyl acetate is with the production device of embodiment 1;

[0033] In advance, add 500ml of isobutanol and acetic acid to the esterification reaction kettle according to the acid-alcohol mass ratio of 2:1, and then add acid sulfate and p-toluenesulfonic acid to mix according to the molar ratio of 1:1.5. 5.9g of the composite catalyst, that is, the composite catalyst accounts for 1.25% of the total weight of the bottom material of the raw material. Acid sulfate is selected BaHSO 4 .

[0034] Through DCS control, perform the following operations on the console: control the opening of the steam valve to control the temperature rise and reaction pressure of the esterification reactor. When the temperature in the esterification reactor rises to 60-80°C, the acetic acid and Butanol flow meter regulating valve, adjust the feed opening (control feed flow,) control the flow o...

Embodiment 3

[0040] Embodiment 3, a kind of production method of isobutyl acetate, the production device of the used isobutyl acetate is with the production device of embodiment 1;

[0041] Add 500ml of isobutanol mixed with acetic acid in the esterification reactor in advance at an acid-alcohol mass ratio of 2:1, add acid sulfate and p-toluenesulfonic acid (molar ratio 1:1) and mix to form The obtained composite catalyst was 4.75g, that is, the composite catalyst accounted for 1.0% of the total weight of the raw material base. Acid sulfate choose CaHSO 4 .

[0042] All the other are with embodiment 1.

[0043] The yield was 98.9%.

[0044] The purity of the finally obtained isobutyl acetate is 99.0%, moisture %: 0.1%, acidity %: 0.01%; above-mentioned % is mass percentage.

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Abstract

The invention discloses a method for producing isobutyl acetate. The method comprises the following steps of: 1) adding a raw material substrate and a composite catalyst into an esterification reaction kettle, wherein the raw material substrate is a mixture of acetic acid and isobutanol, and the composite catalyst is a mixture obtained by mixing acid sulfate and p-toluenesulfonic acid in a molar ratio of 1:(2-1); and continuously adding the isobutanol and the acetic acid serving as raw materials into the esterification reaction kettle in a molar ratio of 1:1, wherein esterification reaction temperature is between 98 and 118 DEG C, and esterification reaction pressure is 0.01 to 0.1MPa; and 2) discharging crude ester liquid containing the isobutyl acetate from the esterification reaction kettle, adding into a rectifying tower for separating, extracting the isobutyl acetate serving as a finished product at the bottom of the rectifying tower, and evaporating a mixture of the isobutanol and water on the top of the rectifying tower; and performing phase separation on the mixture of the isobutanol and the water, and returning the separated isobutanol to the esterification reaction kettle for recycling. The method for producing the isobutyl acetate has the characteristic of high product yield.

Description

technical field [0001] The invention relates to a production method of organic chemicals, in particular to a continuous production method of isobutyl acetate. Background technique [0002] Isobutyl acetate is an important organic chemical intermediate, widely used in the fields of solvents, plasticizers, surfactants and polymer monomers. In recent years, with the development of my country's PTA industry, paint industry, coating industry and pharmaceutical and pesticide industries With the rapid development and continuous development of downstream industries, isobutyl acetate has broad application prospects. Its structural formula: [0003] [0004] The traditional production method of isobutyl acetate is acetic acid and isobutanol in a sulfuric acid catalyst (ie H 2 SO 4 , industrial applications are mainly 30%, 98% content) in the presence of intermittent esterification reaction, large energy consumption, small production capacity, low yield (≤85%), many side reactions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/08B01J31/26
Inventor 冯烈陈云斌强林萍邱昌福王世伟
Owner ZHEJIANG JIANYE CHEM