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Preparation method for polyformaldehyde dimethyl ether adopted as alcohol-containing fuel additive

A polyoxymethylene dimethyl ether and additive technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of fuel quality decline, product rate decline, moisture reduction rate is not high, etc., to reduce the occurrence of hydrolysis , avoid product rate, reduce the effect of water content

Active Publication Date: 2015-04-15
GUIZHOU QIANSHENG NEW ENERGY IND
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In the above-mentioned prior art, although the degree of polymerization of polyoxymethylene dimethyl ether and the amount of fuel added are defined, and the moisture content of polyoxymethylene dimethyl ether is also reduced, the following problems still exist in the above-mentioned technology The disadvantage is that the impurity treatment in polyoxymethylene dimethyl ether is not appropriate, resulting in a low moisture reduction rate, and the generated moisture is not treated, which leads to impurities such as moisture and reactants. At the same time, the use of acid as a catalyst leads to The product is easy to decompose during storage, resulting in a decrease in product rate, which will not only affect the advantage of adding fuel to improve the quality of the fuel, but will also lead to a decrease in the quality of the fuel itself

Method used

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  • Preparation method for polyformaldehyde dimethyl ether adopted as alcohol-containing fuel additive

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Experimental program
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Effect test

Embodiment 1

[0023] Methanol and paraformaldehyde are added into the reactor according to the mass ratio of 1:1, and 5% of the total weight of methanol and polyformaldehyde is added as a polyferric sulfate compound as a catalyst, and the temperature of the reactor is raised within 1h. to 40°C, and adjust the pressure to 0.1MPa, distill the reactants in the reactor, and condense the n=1-2 fraction with a temperature less than 100°C and the n=3-6 fraction with a temperature greater than 100°C After the condenser is condensed, it is packed into the Erlenmeyer flask arranged downstream of the condenser, and a pre-dehydrating agent is housed in the Erlenmeyer flask, the fraction is subjected to pre-dehydration treatment, and then separated to obtain the polyoxymethylene dimethylformaldehyde after the pre-dehydration treatment. The mixture of ether and oil and water, methanol and other impurities, return the water, methanol and other impurities to the reactor, and transfer the mixture of dimethyl...

Embodiment 2

[0025] Methanol and paraformaldehyde are added to the reactor according to the mass ratio of 2:1, and 8% of the total weight of methanol and polyformaldehyde is added as a polyferric sulfate compound as a catalyst, and the temperature of the reactor is raised within 1h. to 60°C, and adjust the pressure to 0.3MPa, distill the reactants in the reactor, and condense the n=1-2 fraction with a temperature less than 100°C and the n=3-6 fraction with a temperature greater than 100°C After the condenser is condensed, it is packed into the Erlenmeyer flask arranged downstream of the condenser, and a pre-dehydrating agent is housed in the Erlenmeyer flask, the fraction is subjected to pre-dehydration treatment, and then separated to obtain the polyoxymethylene dimethylformaldehyde after the pre-dehydration treatment. The mixture of ether and oil and water, methanol and other impurities, return the water, methanol and other impurities to the reactor, and transfer the mixture of dimethyl e...

Embodiment 3

[0027] Methanol and paraformaldehyde are added into the reactor according to the mass ratio of 3:1, and 10% of the total weight of methanol and polyformaldehyde is added to the polyferric sulfate complex as a catalyst, and the temperature of the reactor is raised within 1h. to 80°C, and adjust the pressure to 0.9MPa, distill the reactants in the reactor, and condense the n=1-2 fraction with a temperature less than 100°C and the n=3-6 fraction with a temperature greater than 100°C After the condenser is condensed, it is packed into the Erlenmeyer flask arranged downstream of the condenser, and a pre-dehydrating agent is housed in the Erlenmeyer flask, the fraction is subjected to pre-dehydration treatment, and then separated to obtain the polyoxymethylene dimethylformaldehyde after the pre-dehydration treatment. The mixture of ether and oil and water, methanol and other impurities, return the water, methanol and other impurities to the reactor, and transfer the mixture of dimeth...

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Abstract

The present invention relates to a preparation method for polyformaldehyde dimethyl ether adopted as an alcohol-containing fuel additive, wherein a mixture of methanol and a paraformaldehyde dissolving liquid reacts in a reaction kettle under the effect of a catalyst. The method is characterized in that a polyferric sulfate compounding material is adopted as a catalyst, and reacts with a mixture of methanol and paraformaldehyde in a reaction kettle, a pre-dewatering treatment is performed after distillation, and deep molecular sieve dewatering is performed to produce the polyformaldehyde dimethyl ether adopted as the alcohol-containing fuel additive, such that the influence of application of the acid as the catalyst on the polyformaldehyde dimethyl ether decomposition is eliminated so as to cause the short storage time; and the water contained in the reactant and the water produced from the reaction are removed so as to reduce the water content in the product and reduce the hydrolysis production rate of the product, such that the Reid vapor pressure is reduced, the water resistance is improved, the gasoline quality is ensured, and the technical problem that the vehicle easily produces gas blocking at the high altitude area in the high temperature season is prevented.

Description

technical field [0001] The invention relates to a method for preparing polyoxymethylene dimethyl ether used as an alcohol-containing fuel additive. Background technique [0002] The molecular formula of polyoxymethylene dimethyl ether is H 3 CO(CH 2 O) n CH 3 , where n≥1 is a positive integer, and its usual preparation method is to catalyze the reaction of methanol and paraformaldehyde aqueous solution under an acidic catalyst. It has the same properties as acetal and is stable in alkaline or neutral environments. However, due to the action of the acidic catalyst, it will also lead to hydrolysis, first generate hemiacetal and methanol, and then further hydrolyze the hemiacetal to generate formaldehyde and methanol, which will lead to the stability of polyoxymethylene dimethyl ether. . [0003] Experimental data show that polyoxymethylene dimethyl ether is prepared by heating paraformaldehyde and methanol at 150-180°C in the presence of sulfuric acid or hydrochloric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/30
Inventor 陈鹏骞唐德华马朝阳徐从贵谢代群万兴海刘新忠彭益何定培吕艳丽张林
Owner GUIZHOU QIANSHENG NEW ENERGY IND