Adjustable hydrophilic and hydrophobic catalyst for preparation of polymethoxydimethyl ether as well as preparation method and application thereof

A technology of polyoxymethylene dimethyl ether and catalyst, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of reaction optimization, separation optimization, and yield improvement

Active Publication Date: 2019-10-15
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the technical problems existing in the current synthesis of polyoxymethylene dimethyl ether, the present invention provides a catalyst for preparing polyoxymethylene dimethyl ether that can regulate the hydrophilic and hydrop

Method used

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  • Adjustable hydrophilic and hydrophobic catalyst for preparation of polymethoxydimethyl ether as well as preparation method and application thereof
  • Adjustable hydrophilic and hydrophobic catalyst for preparation of polymethoxydimethyl ether as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0036] Example 1

[0037] First, weigh 0.2g of graphene oxide, disperse it into 50ml of ethanol solution, and stir it. In order to better disperse it in the solution, place the suspension in an ultrasonic disperser for ultrasonic dispersion for 15 minutes; weigh 37.5g of Aluminum nitrate in water was dissolved in 50ml deionized water at 60°C, mixed with the dispersed graphene oxide-ethanol suspension, placed in an ultrasonic disperser for ultrasonic dispersion for 15 minutes, and then placed in a water bath at a constant temperature of 60°C for static After standing for 4 hours, put it in a blast drying oven at 120°C for 12 hours to evaporate the moisture remaining in the impregnated product. Finally, under the protection of nitrogen, the heating rate was controlled at 2 °C / min, and the temperature was gradually increased to 400 °C, and the calcined catalyst was kept for 4 h. The product taken out is a graphene-supported alumina catalyst, the mass ratio of the carrier to the ...

Example Embodiment

[0041] Example 2

[0042]Select the unsupported activated alumina of the catalyst and name it as Al 2 o 3 -GO0, for comparison.

[0043] Catalyst evaluation is the same as in Example 1.

[0044] The result of the reaction is that the conversion rate of methanol is 19%, the selectivity of methylal is 81%, and the PODE 2 15% selectivity, PODE 3 3% selectivity, PODE 4 The selectivity is 1%.

Example Embodiment

[0045] Example 3

[0046] Catalyst HZSM-5 was chosen as a comparison.

[0047] Catalyst evaluation is the same as in Example 1.

[0048] The result of the reaction is that the conversion rate of methanol is 85%, the selectivity of methylal is 76%, and the PODE 2 18% selectivity, PODE 3 4% selectivity, PODE 4 The selectivity is 1%.

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Abstract

The invention discloses an adjustable hydrophilic and hydrophobic catalyst for preparation of polymethoxydimethyl ether as well as a preparation method and application thereof. The catalyst comprisesa hydrophobic carrier and an active component, wherein the active component is a solid acid substance; the hydrophobic carrier accounts for 2 to 98 percent of the weight of the catalyst; and the active component accounts for 2 to 98 percent of the weight of the catalyst. The hydrophobic performance of the catalyst can be adjusted by adjusting the proportion of a hydrophobic agent to the active component. The catalyst prepared by the method can be applied to preparation of the polymethoxydimethyl ether through reaction of methanol and formaldehyde, wherein the methanol can be replaced by dimethyl ether, methylal and polymethoxydimethyl ether with low polymerization degree; the types of the formaldehyde can be a formaldehyde solution with different concentration, paraformaldehyde and trioxymethylene. The catalyst provided by the invention has the effect of adjusting distribution of polymethoxydimethyl ether products, can realize reasonable optimization of the hydrophilic and hydrophobicproperties of the catalyst according to production requirements, can realize reaction optimization and separation optimization and accords with the requirement of green chemical development.

Description

technical field [0001] The invention relates to the preparation of a controllable hydrophilic and hydrophobic catalyst, which is applied to the reaction of synthesizing polyoxymethylene dimethyl ether from coal-based raw materials. The technology belongs to the field of catalyst synthesis and the field of clean utilization of coal-based raw materials. Background technique [0002] Polyoxymethylene dimethyl ether (referred to as PODEn, DMMn, English name Polyoxymethylene dimethylethers) has attracted widespread attention due to its high oxygen content and similar physical and chemical properties to diesel. Polyoxymethylene dimethyl ether has a continuous C-O structure and does not contain C-C bonds in the molecule. This excellent molecular structure allows it to be used as a diesel additive to effectively increase the cetane number of diesel, increase the oxygen content of fuel to promote combustion, and greatly Reduce the emission of pollutants such as nitrogen oxides and s...

Claims

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Application Information

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IPC IPC(8): C07C41/56C07C43/30B01J21/04B01J29/40
CPCC07C41/56B01J21/04B01J29/40C07C43/30
Inventor 张建强李亚坤李燕燕杨许召杜俊平印凯欧王开锋
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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