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Method for continuously and efficiently preparing methyl ethyl ketone

A methyl ethyl ketone, high-efficiency technology, applied in 2 fields, can solve problems such as short life, easy carbon deposition, strong corrosion of sulfuric acid catalyst, etc.

Inactive Publication Date: 2012-02-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the development of an efficient catalyst for the dehydration of 2,3-butanediol to prepare methyl ethyl ketone can not only enable the dehydration reaction to proceed at a lower temperature, but also overcome the strong corrosiveness of the sulfuric acid catalyst and the easy carbon deposition of the gas-solid reaction catalyst. The shortcomings of short life, and the corresponding environmentally friendly, energy-saving and consumption-reducing processes are of great significance to the preparation of large chemical products methyl ethyl ketone by biological routes

Method used

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  • Method for continuously and efficiently preparing methyl ethyl ketone
  • Method for continuously and efficiently preparing methyl ethyl ketone
  • Method for continuously and efficiently preparing methyl ethyl ketone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The 1000ml four-neck flask is connected with a glass rectification tower with an inner diameter of 35mm and a 1m stainless steel θ filler inside. There is a condenser and a reflux distributor at the top of the tower. Add 5 grams of p-toluenesulfonic acid in the flask, adopt magnetic stirrer to stir, control temperature 165 ℃ with intelligent electric heating mantle, continuously pump into the 2,3-butanediol solution of 80% (wt) content with metering pump, The feed rate is 10ml / min, the overhead reflux ratio is adjusted to be 1:1, and the overhead distillation temperature is 70-80°C. The top discharge was analyzed by gas chromatography and quantified by the internal standard method. Through analysis and calculation, the conversion rate of 2,3-butanediol is 97%, the selectivity of methyl ethyl ketone is 96%, and the yield is 93.1%.

Embodiment 2～12

[0034] The same as Example 1, 2,3-butanediol was dehydrated under different catalysts and different reaction conditions, and the results are shown in Table 1.

[0035]

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Abstract

The invention belongs to the technical fields of biology and chemical industry and aims to provide a device and a method for continuously preparing methyl ethyl ketone by liquid phase dehydration of 2,3-butanediol. The method comprises the following step of carrying out liquid phase dehydration reaction on 2,3-butanediol in a reaction rectifying tower based on organic sulfoacid as a catalyst so as to prepare methyl ethyl ketone. According to the invention, the catalyst is not inactivated, has good stability and can be continuously used; the conversion rate of 2,3-butanediol is more than 95%, and the yield of methyl ethyl ketone is more than 91%. The method for producing methyl ethyl ketone has the advantages of simple process flow, mild reaction conditions, low production cost and the like, is environmentally friendly, and is a new method by which industrial production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical fields of biology and chemical industry, and in particular relates to a method for preparing methyl ethyl ketone by dehydrating 2,3-butanediol produced by a biological fermentation method. Background technique [0002] Methyl ethyl ketone (Methyl Ethyl Ketone, MEK) also known as methyl ethyl ketone, butanone, molecular formula CH 3 COCH 2 CH 3 , its properties are colorless transparent liquid, volatile and aromatic, flammable, boiling point 79.64 ℃, melting point -86.69 ℃. It itself contains a carbonyl group and an active oxygen adjacent to the carbonyl group, and is prone to various chemical reactions. Methyl ethyl ketone can be miscible with a variety of hydrocarbon solvents, and has the advantages of moderate volatility, strong solvency, low viscosity, stability, and non-toxicity. Its importance in ketone solvents is second only to acetone. It can be miscible with most hydrocarbon solvents, and is widely us...

Claims

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Application Information

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IPC IPC(8): C07C49/10C07C45/52C07C45/82B01J31/02
Inventor 方云进邵园艳殷俊方美琴杜伟超徐瑞峰戢子龙
Owner EAST CHINA UNIV OF SCI & TECH
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