Synthesis method of polymethoxy methylal

A technology of polymethoxymethylacetal and a synthesis method, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of difficult catalyst separation, high energy consumption for processing, process corrosion and the like, and achieve product Good distribution, simple reaction process, and the effect of improving selectivity

Inactive Publication Date: 2012-05-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a synthesis method of polymethoxymethy

Method used

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  • Synthesis method of polymethoxy methylal
  • Synthesis method of polymethoxy methylal
  • Synthesis method of polymethoxy methylal

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In the fixed-bed reactor, the acidic styrene-based cation exchange resin catalyst is packed, and the N 2 Cylinder 1 is pressurized to 1.5MPa, and the raw material with a molar ratio of methylal and paraformaldehyde of 2 is added to the raw material tank, passed through a high-pressure cross-flow pump, and entered into the bed through a preheater, and the temperature of the reaction furnace is set to 100°C. Airspeed is 0.5h -1 After the reaction, samples were taken, and analyzed by gas chromatography, the conversion rate of paraformaldehyde was 93.1%, and the relative content was 23.6% for trimers and 16.1% for tetramers.

Embodiment 2

[0031] Same example 1, the catalyst is an acidic styrene-based cation exchange resin, and the space velocity is 0.5h -1 , the molar ratio of methylal to paraformaldehyde is 2, the reaction pressure is 2MPa, and the reaction temperature is 100°C. Sampling and analysis by gas chromatography shows that the conversion rate of paraformaldehyde is 94.8%. The relative content is 29.7% for trimers and 21.2% for tetrapolymers. %.

Embodiment 3

[0033] Same example 1, the catalyst is an acidic styrene-based cation exchange resin, and the space velocity is 0.5h -1 , the molar ratio of methylal to paraformaldehyde is 2, the reaction pressure is 4MPa, and the reaction temperature is 100°C. Sampling and analysis by gas chromatography shows that the conversion rate of paraformaldehyde is 95.9%, and the relative content is 30.0% for trimers and 21.9% for tetrapolymers. %.

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Abstract

The invention relates to a synthesis method of polymethoxy methylal. A fixed bed reactor is used, cation catalytic activity resin is selected as a catalyst, methylal and trioxymethylene serve as reactants and are reacted under the atmosphere of nitrogen, reaction temperature is controlled to be 80 to 150 DEG C, and pressure is controlled to be 0.6 to 4.0 MPa. The method has the advantages that: water is not introduced into a liquid-solid system of the polymethoxy methylal, and a by-product, namely the water, cannot be generated; a system which is finally obtained belongs to polymer series; a target product is easy to separate; yield can be improved; energy consumption is reduced; the method is simple to operate; a catalyst system is directly formed in a bed layer and facilitates cyclic utilization; and a fixed bed system facilitates implementation of scale continuous industrial production.

Description

technical field [0001] The invention relates to a synthesis method of polymethoxy formal. Background technique [0002] In today's world, with the increase in the number of cars, the harmful substances emitted by vehicles into the atmosphere continue to increase, and at the same time, the sharp increase in energy consumption makes the pressure on environmental resources increasingly heavy. Therefore, the oil industry has long been committed to finding some additives that can improve the quality of oil products, so as to improve the performance of fuel oil, thereby reducing the emission of pollutants. [0003] In terms of diesel additives, many companies and research institutes are currently working hard to find suitable additives. The screening objects include: ethers, acetals, alcohols, carbonates, fats, glycol derivatives, etc. For diesel, oxygenated compounds need to have high cetane number, low self-ignition point, and fast ignition. In addition, it should have good mi...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/50
Inventor 张旭斌潘志群蔡旺锋王燕王富民
Owner TIANJIN UNIV
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