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Catalyst for synthesis of polyoxymethylene dimethyl ether and application of catalyst

A technology of polyoxymethylene dimethyl ether and catalyst, which is applied in the field of synthesis of polyoxymethylene dimethyl ether, can solve the problems of poor selectivity and low yield, and achieve the effects of simple separation, high catalytic activity and high product yield

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is the problem of poor selectivity and low yield in the process of synthesizing polyoxymethylene dimethyl ether with methylal and polyoxymethylene as raw materials in the prior art. A new method for polyoxymethylene dimethyl ether is provided. Catalysts for Methyl Ether Synthesis

Method used

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  • Catalyst for synthesis of polyoxymethylene dimethyl ether and application of catalyst
  • Catalyst for synthesis of polyoxymethylene dimethyl ether and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0026] 1. Preparation of metal-modified cation exchange resin: wash 48 g of hydrogen-type styrene-based strong acid cation exchange resin with deionized water for 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours; Type styrene series strongly acidic cation exchange resin and 267g mass fraction are 2% AlCl 3 Stir the ethanol solution together for 10 hours, wash with absolute ethanol 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours to obtain a metal-modified cation exchange resin catalyst.

[0027] 2. Add 2.45g of this resin catalyst, 60g of methylal and 60g of paraformaldehyde into a 300ml tank reactor, react at 90°C and 0.4MPa autogenous pressure for 4h, extract a sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is shown in Table 1.

[0028]

Embodiment 2

[0030] 1. Preparation of metal-modified cation exchange resin: wash 48 g of hydrogen-type styrene-based strong acid cation exchange resin with deionized water for 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours; Type styrene series strongly acidic cation exchange resin and 325g mass fraction are 2% FeCl 3 Stir the ethanol solution together for 10 hours, wash with absolute ethanol 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours to obtain a metal-modified cation exchange resin catalyst.

[0031] 2. Add 2.51g of this resin catalyst, 60g of methylal and 60g of paraformaldehyde into a 300ml tank reactor, react at 90°C and 0.4MPa autogenous pressure for 4h, extract a sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is shown in Table 1.

[0032]

Embodiment 3

[0034] 1. Preparation of metal-modified cation exchange resin: wash 48 g of hydrogen-type styrene-based strong acid cation exchange resin with deionized water for 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours; Type styrene series strongly acidic cation exchange resin and 391.5g mass fraction are 2% SnCl 4 Stir the ethanol solution together for 10 hours, wash with absolute ethanol 6 times, each time for 15 minutes, and dry in a vacuum oven at 90°C for 24 hours to obtain a metal-modified cation exchange resin catalyst.

[0035]2. Add 2.58g of this resin catalyst, 60g of methylal and 60g of paraformaldehyde into a 300ml tank reactor, react at 90°C and 0.4MPa autogenous pressure for 4h, extract a sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is shown in Table 1.

[0036]

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Abstract

The invention relates to a catalyst for synthesis of polyoxymethylene dimethyl ether, application of the catalyst in synthesis of polyoxymethylene dimethyl ether and a method for synthesizing polyoxymethylene dimethyl ether, and mainly aims to solve the problem that the catalyst has low selectivity and low yield for polyoxymethylene dimethyl ether which has a polymierization degree n of 2-10 in the prior art. The technical problem can be well solved by adopting a technical scheme that the catalyst is a metal ion modified hydrogenous strong-acid ion exchange resin, wherein the modifying metal is at least one of Al, Fe, Sn and Zn; and the ion exchange degree of the modifying metal in the catalyst is more than zero and less than or equal to 50 percent. The catalyst can be used in industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a catalyst for synthesizing polyoxymethylene dimethyl ether, an application of the catalyst in synthesizing polyoxymethylene dimethyl ether, and a synthesis method of polyoxymethylene dimethyl ether. Background technique [0002] In recent years, my country's oil prices have continued to rise, and gasoline and diesel famines have occurred frequently; oil resources have become increasingly tense, and the pressure on oil supply has increased unprecedentedly. It is estimated that in the next 10 to 20 years, my country's oil supply rate will only be about 50%. Therefore, the development of new oil substitutes has been paid more and more attention. [0003] DME was first proposed as a diesel additive. However, due to its poor cold start performance, high vapor pressure at room temperature, and easy air resistance, the cost of DME as an alternative fuel for vehicles has increased significantly. Polyoxymethylene dimethyl ether, or P...

Claims

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Application Information

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IPC IPC(8): B01J31/08C07C41/56C07C43/30
Inventor 刘志成许云风高焕新杨为民
Owner CHINA PETROLEUM & CHEM CORP
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