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Production method for vinyl ethers

A technology of vinyl ethers and production methods, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as environmental pollution, poor product quality, and many by-products

Active Publication Date: 2010-02-17
山西三维华邦集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a production method of vinyl ethers in order to solve the problems of environmental pollution, poor product quality, many by-products and poor product quality existing in the method for synthesizing vinyl ethers in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, a kind of production method of vinyl ethers, comprises the following steps

[0021] (1) Preparation of acetal: acetaldehyde and alcohol undergo polycondensation reaction to generate acetal under the condition that catalyst exists, add acetaldehyde and alcohol weight ratio 1: 1, catalyst is nitric acid, the consumption of catalyst: 0.5mol / L, reaction temperature, 10°C,

[0022] The reaction principle is: CH 3 CHO+2R-OH→CH 3 CH(OR) 2

[0023] R is -CH 2 CH 3 ,-CH 2 CH 2 CH 3 ,-CH 2 CH 2 CH 2 CH 3 ,-CH 2 (CH 2 ) 2 CH 3 .

[0024] The corresponding alcohols are ethanol, propanol, butanol and isobutanol.

[0025] The reaction is carried out in the acetal tower, and the conversion rate of this step is greater than 85-90%.

[0026] (2) Acetal purification, after the synthesis reaction, carry out oil-water separation, then carry out rectification to the oil phase, the rectification temperature is 100 ℃,

[0027] The synthesized material flows o...

Embodiment 2

[0038] A production method of vinyl ethers, comprising the following steps

[0039] (1) Preparation of acetal: acetaldehyde and alcohol undergo polycondensation reaction to generate acetal under the condition that catalyst exists, add acetaldehyde and alcohol weight ratio 1: 1.5, catalyst is nitric acid, the consumption of catalyst: 0.01mol / L, reaction temperature, 10-50°C,

[0040] (2) acetal purification, after the synthesis reaction, carry out oil-water separation, then carry out rectification to the oil phase, the rectification temperature is 140 ℃,

[0041] The synthesized material flows out from the bottom of the acetal tower, enters the oil-water separator for separation, rectifies the oil phase, and then needs to add a stabilizer, which is anhydrous ammonium carbonate.

[0042] (3) Decomposition of acetal, pyrolysis the acetal that rectification comes out, reaction temperature 400 ℃, use highly selective catalyst: ammonium chloride and calcium chloride (mass ratio 1: ...

Embodiment 3

[0046] A production method of vinyl ethers, comprising the following steps

[0047] (1) Preparation of acetal: acetaldehyde and alcohol undergo polycondensation reaction to generate acetal under the condition that catalyst exists, add acetaldehyde and alcohol weight ratio 1: 3, catalyst is nitric acid, the consumption of catalyst: 0.3mol / L, reaction temperature, 30°C,

[0048] The corresponding alcohols are ethanol, propanol, butanol and isobutanol.

[0049] (2) Acetal purification, after the synthesis reaction, carry out oil-water separation, then carry out rectification to the oil phase, the rectification temperature is 120 ℃,

[0050] The synthesized material flows out from the bottom of the acetal tower, enters the oil-water separator for separation, and rectifies the oil phase, and then needs to add a stabilizer, which is anhydrous ammonium carbonate.

[0051] (3) Decomposition of acetal, the pyrolysis of the acetal from the rectification, the reaction temperature is 35...

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Abstract

The present invention relates to a preparation method for an aether, in particular to a preparation method for vinyl ether. The method is to solve the problem in the existing technology that: the pollution is much greater for synthesizing vinyl ether in the existing method with much worse product quality, much more outgrowth. (One) the preparation for acetals: acetaldehyde and alcohol are taken with polyreaction to produce acetals under the catalyzer; (Two) the purifying of acetals; (Three) the decomposing of acetals; (Four) fine preparation of vinyl ether. The technical method can produce vinyl ethyl ether, vinyl propyl ether, vinyl-n-butyl ether and vinyl-n-butyl ether. The product purity produced by the present invention can reach up to 99.0 percent, which is better than that of the similar product in domestic.

Description

technical field [0001] The invention relates to a production method of ethers, in particular to a production method of vinyl ethers. Background technique [0002] Vinyl ethers (such as vinyl butyl ether) are important organic synthesis intermediates and high polymer monomers. Its homopolymers and copolymers are widely used in adhesives, coatings, lubricants, In many fields such as plastics, especially the copolymer coating of vinyl butyl ether and vinyl chloride has good acid and alkali resistance, water resistance and corrosion resistance, and is widely used in ships, bridges, water traffic marks, etc. [0003] At present, there are mainly the following methods for synthesizing vinyl ethers in the world: (1) It is obtained by the reaction of acetylene and butanol. This method requires less equipment and has high selectivity; however, the consumption cost of acetylene is high and the utilization rate is low, and the process route of the calcium carbide acetylene method poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/28C07C43/16
Inventor 杨学英张建平金昌焕王长华闫济民
Owner 山西三维华邦集团有限公司