Method for synthesizing polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and synthesis method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low conversion rate of trioxymethylene, difficult catalyst separation, poor product selectivity, etc. The effect of high product yield, high product yield and high conversion rate

Active Publication Date: 2010-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that in the prior art, in the process of synthesizing polyoxymethylene dimethyl ether, it is difficult to separate the catalyst and the conversion rate of paraformaldehyde is low, the product selectivity is poor, and the problem that the product yield of n=2~10 is low, Provide a kind of synthetic method of new polyoxymethylene dimethyl ether

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 2 g of catalyst Cl was added to a 300 ml tank reactor - / TiO 2 , 100 milliliters of methanol and 100 grams of paraformaldehyde were reacted for 4 hours at 130 ° C and 0.7 MPa autogenous pressure, and the samples were extracted and analyzed 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

[0020] Add 2 g of catalyst SO to a 300 ml tank reactor 4 2- / Fe 2 o 3 , 100 milliliters of methanol and 44 grams of paraformaldehyde were reacted for 4 hours at 130 ° C and 0.7 MPa autogenous pressure, and the sample was extracted and analyzed 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

[0022] Add 0.5 g of catalyst Cl to a 300 ml tank reactor - / Fe 2 o 3 , 25 milliliters of methanol and 25 grams of paraformaldehyde were reacted for 4 hours at 150 ° C and 0.5 MPa autogenous pressure, and the samples were extracted and analyzed 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 synthesizing polyoxymethylene dimethyl ether. The invention mainly solves the following problems of the prior art that: in the process of synthesizing polyoxymethylene dimethyl ether, catalyst separation is difficult, the material conversion rate is low, and product selectivity is poor. The method adopts methanol and trioxymethylene as materials, the reactiontemperature is 70 DEG C to 200 DEG C, the reaction pressure is 0.5MPa to 6MPa, the materials react with super solid acidic catalyst by way of contact, so that the polyoxymethylene dimethyl ether CH3O(CH2O)nCH3 is produced, wherein the used catalyst is selected from solid superacids. By weight part, the polyoxymethylene dimethyl ethe comprises the following components: (a) 20 to 70 parts of acid selected from sulfuric acid, hydrochloric acid or peroxosulfuric acid or at least one of salt thereof; (b) 30 to 80 parts of carrier selected from at least one of ZrO2, TiO2, SiO2, Fe2O3, SnO2, WO3 andAl203. The method effectively solves the problems, and can be used in the industrial production of 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 Applications(China)
IPC IPC(8): C07C43/30C07C41/56B01J27/053
Inventor 李丰冯伟樑高焕新孙洪敏杨为民
Owner CHINA PETROLEUM & CHEM CORP
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