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Method for synthesizing polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and paraformaldehyde, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low catalyst reaction efficiency, high cost of paraformaldehyde, and many by-products, etc. Achieve improved distribution, reduced selectivity, and lower raw material costs

Active Publication Date: 2012-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that in the process of synthesizing polyoxymethylene dimethyl ether in the prior art, the reaction efficiency of solid superacid is low as a catalyst, the cost of raw material paraformaldehyde is high, and there are many by-products after the reaction. A new method is provided. The method for synthesizing polyoxymethylene dimethyl ether

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 0.2 g catalyst SO to a 300 ml tank reactor 4 2- / ZrO 2 / SBA-15, 100ml of methylal and 100g of paraformaldehyde, reacted at 130°C and 0.7MPa autogenous pressure for 4h, extracted the sample and analyzed 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.

Embodiment 2

[0018] 0.2 g of catalyst Cl was added to a 300 ml tank reactor - / Fe 2 o 3 / MCM-22, 45ml of methylal and 100g of paraformaldehyde, reacted at 130°C and 0.5MPa autogenous pressure for 4h, extracted the sample and analyzed 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.

Embodiment 3

[0020] Add 0.1 g catalyst SO to a 300 ml tank reactor 4 2- / ZrO 2 / SBA-15, 100ml of methylal and 100g of paraformaldehyde, at 150°C, flush with nitrogen to a pressure of 4MPa, react for 8h, extract the 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.

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Abstract

The invention relates to a method for synthesizing polyoxymethylene dimethyl ether, which mainly solves the problems of low reaction efficiency of a solid superacid catalyst, high cost of raw material trioxymethylene and more byproducts after reaction during synthesis of polyoxymethylene dimethyl ether existing in the prior art. In the method, dimethoxymethane and paraformaldehyde are used as rawmaterials, wherein the mass ratio of the dimethoxymethane to the paraformaldehyde is 0.5-10:1; the raw materials are in contact with the catalyst to generate catalytic reaction to prepare the polyoxymethylene dimethyl ether under the conditions of reaction temperature of 70-200 DEG C and reaction pressure of 0.2-6MPa; the amount of the used catalyst is 0.1-5.0 percent; and the used catalyst comprises the following components in percentage by weight: (a) 30-80 parts of molecular sieve carrier; and (b) 20-70 parts of solid superacid. Due to the technical scheme, the problems are solved well; and the method can be used for industrial production of the polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a method for synthesizing polyoxymethylene dimethyl ether. Background technique [0002] In recent years, with the continuous rise of international crude oil prices and increasingly tight resources, the pressure on oil supply has increased unprecedentedly. Taking advantage of my country's rich coal resources, the development of new oil substitutes from coal-based methanol has attracted increasing attention. [0003] Polyoxymethylene dimethyl ether, that is, Polyoxymethylene dimethyl ethers (PODE), is a general term for a class of substances, and its simplified formula can be expressed as CH 3 O(CH 2 O) n CH 3 , with a higher octane number (> 30) and oxygen content (42 to 51%). When the value of n is 2-10, its physical properties and combustion performance are very close to those of diesel. Therefore polyoxymethylene dimethyl ether can be used as a new type of clean diesel component, and the addition amount in diesel oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G2/20C08G2/06C07C43/30C07C41/56
Inventor 李丰刘志成高焕新
Owner CHINA PETROLEUM & CHEM CORP
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