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Method for catalytically 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 utilization efficiency of unit catalyst, achieve improved distribution, reduce selectivity, The effect of improving utilization efficiency

Active Publication Date: 2011-12-28
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 the problem of low utilization efficiency of unit catalyst in the process of synthesizing polyoxymethylene dimethyl ether in the prior art, and a new method for catalytically synthesizing polyoxymethylene dimethyl ether is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 0.5 g catalyst SO to a 300 ml tank reactor 4 2- / ZrO 2 / SBA-15, 100ml of methanol and 100g of paraformaldehyde, react at 130°C and 0.7MPa autogenous pressure for 4h, extract the sample and analyze it by gas chromatography after centrifugation. The product contains methylal, polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is shown in Table 1.

Embodiment 2

[0018] Add 0.5 g of catalyst Cl to a 300 ml tank reactor - / Fe 2 o 3 / MCM-22, 45 ml of methanol and 100 g of paraformaldehyde, reacted at 130 ° C and 0.4 MPa autogenous pressure for 4 hours, extracted samples and analyzed them by gas chromatography after centrifugation. The product contains methylal, 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 methanol and 100g of paraformaldehyde, react at 150°C and 0.5MPa autogenous pressure for 4h, extract the sample and analyze it by gas chromatography after centrifugation. The product contains methylal, 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 catalytically synthesizing polyformaldehyde dimethyl ether. The method mainly solves the problem of low reaction efficiency of unit catalyst in the process of synthesizing the polyformaldehyde dimethyl ether in the conventional technology. Methanol and trioxymethylene are used as raw materials in the method, and the molar ratio of the methanol to the trioxymethylene is (0.5-10): 1; the raw materials are in contact with a catalyst to produce catalytic reaction so as to prepare the polyformaldehyde dimethyl ether at the reaction temperature of between 70 and 200 DEG C under the reaction pressure of 0.2 to 6MPa; the consumption of the catalyst is 0.1 to 5.0 percent of the weight of the raw materials; and the catalyst comprises the following components in part by weight: a) 30 to 80 parts of molecular sieve carrier, and b) 20 to 70 parts of solid super-strong acid. According to the technical scheme, the problem is well solved, and the method can be used for industrial production of the polyformaldehyde dimethyl ether.

Description

technical field [0001] The invention relates to a method for catalytically 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 amoun...

Claims

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Application Information

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