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Synthesis method of low polymerization degree methoxy dimethyl ether and catalyst

A technology with high degree of methoxy dimethyl ether and low degree of polymerization, applied in the field of chemical synthesis, can solve problems such as high cost, strong corrosion of equipment, difficult separation, etc., and achieve the effect of reducing the cost of raw materials

Inactive Publication Date: 2014-04-23
赵铁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction process is simple and controllable, but this preparation method introduces by-product water, which easily hydrolyzes the target product acetal to form hemiacetal, which is difficult to separate; moreover, the cost of the catalyst is high and the equipment is highly corrosive
The used paraformaldehyde also has the problem of high cost, and it is difficult to achieve industrialized production

Method used

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  • Synthesis method of low polymerization degree methoxy dimethyl ether and catalyst
  • Synthesis method of low polymerization degree methoxy dimethyl ether and catalyst
  • Synthesis method of low polymerization degree methoxy dimethyl ether and catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0056] After soaking the attapulgite in heteropoly acid for 24 hours, soak it in hot water at 70°C. During the soaking, change the water every 15 minutes, and keep stirring during the soaking. After changing the water 4 times, change the water every 30 minutes Once, change the water 7 times in total, until the immersion water does not turn brown and there is little foam; take hydrochloric acid with a concentration of 1mol / L that is 2.5 times the volume of the treated attapulgite, and press the rate of 1.5 times per hour. Flow the taken hydrochloric acid through the attapulgite until it all flows through; then rinse the attapulgite with water until the pH value of the effluent is 5, and then use a mass percent concentration of 7% and a volume of attapulgite after treatment. The NaCl solution with 3 times the volume of the attapulgite flows through the attapulgite; the attapulgite after the NaCl solution flows through is washed with water until the pH value of the effluent is 5, ...

Embodiment 2

[0067] After soaking the attapulgite in heteropoly acid for 24 hours, soak it repeatedly in hot water at 80°C. During the soaking, change the water every 15 minutes, and keep stirring during the soaking. After changing the water 5 times, change the water every 30 minutes. Change the water once, and change the water 8 times in total, until the immersion water does not turn brown and there are few foams; take hydrochloric acid with a concentration of 1mol / L that is 2.5 times the volume of the treated attapulgite, and use it at a rate of 1.5 times per hour. Layer volume The hydrochloric acid taken flows through the attapulgite until all of it flows through; then the attapulgite that the hydrochloric acid flows through is washed with water until the pH value of the water is 5, and then it is treated with a concentration of 7% by mass percentage and a volume of NaCl solution with 3 times the volume of the attapulgite flows through the attapulgite; rinse the attapulgite through which...

Embodiment 3

[0070] After soaking the attapulgite in heteropoly acid for 24 hours, soak it repeatedly in hot water at 75°C. During the soaking, change the water every 15 minutes, and keep stirring during the soaking. After changing the water 5 times, change the water every 30 minutes. Change the water once, and change the water 7 times in total until the immersion water does not turn brown and there are few foams; take hydrochloric acid with a concentration of 1mol / L that is 2.5 times the volume of the treated attapulgite, and use it at a rate of 1.5 times per hour. Layer volume The hydrochloric acid taken flows through the attapulgite until all of it flows through; then the attapulgite that the hydrochloric acid flows through is washed with water until the pH value of the effluent is 5, and then the concentration of the mass percent is 7%, and the volume is treated NaCl solution with 3 times the volume of attapulgite flows through the attapulgite; rinse the attapulgite that the NaCl soluti...

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Abstract

The invention provides a synthesis method of low polymerization degree methoxy dimethyl ether and a catalyst, and the synthesis method is as follows: soaking attapulgite with heteropolyacid, repeatedly washing with hot water by immersion; sequentially flowing hydrochloric acid and a NaCl solution past the attapulgite; swashing then flowing the NaCl solution past the attapulgite; flowing a NaOH solution past the attapulgite; swashing the attapulgite; using the hydrochloric acid or sulfuric acid to convert the attapulgite into H type, swashing the attapulgite with deionized water, baking and screening to obtain the catalyst; then in a ratio of 100ml of methylal added with 80-100 g of low polymerization degree paraformaldehyde, respectively taking the methylal and the low polymerization degree polyformaldehyde; and taking the catalyst with a mass of 0.2-6% of the total mass of a reaction system for a catalytic reaction at certain temperature, under certain pressure and in certain mixing speed to obtain the low polymerization degree methoxy dimethyl ether. The synthesis method can greatly reduce the cost of raw materials; the raw material conversion rate reaches above 85%, and a better technical effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis and relates to a method for synthesizing diesel additives, in particular to a method for synthesizing polyoxymethylene dimethyl ether with a low degree of polymerization; the invention also relates to a catalyst used in the synthesis method. Background technique [0002] With the massive increase in the number of motor vehicles, the problems of air pollution and energy shortage are becoming more and more serious. Therefore, it is necessary to develop new diesel engine fuels that can reduce engine pollutant emissions; at the same time, seek alternative energy sources provided by renewable resources. [0003] In recent years, a convenient and effective measure to alleviate energy shortage and air pollution problems has emerged: only diesel blending components are used without changing the engine structure or adding additional devices matching the engine. The proposal of this measure has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56B01J31/26
CPCB01J31/26B01J2231/10C07C41/56C07C43/30
Inventor 赵铁应国强
Owner 赵铁
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