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Hydrophilic-hydrophobic catalyst adjustable for preparing polyoxymethylene dimethyl ether, preparation method and application thereof

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

Active Publication Date: 2022-03-25
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 hydrophobic type and its preparation method and application. Through the synthesis, the hydrophilic and hydrophobic type can be adjusted. Catalysts are used to adjust the product distribution during the synthesis of polyoxymethylene dimethyl ether

Method used

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  • Hydrophilic-hydrophobic catalyst adjustable for preparing polyoxymethylene dimethyl ether, preparation method and application thereof
  • Hydrophilic-hydrophobic catalyst adjustable for preparing polyoxymethylene dimethyl ether, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First weigh 0.2g graphene oxide, disperse it into 50ml ethanol solution, stir, in order to make it better dispersed in the solution, place the suspension in an ultrasonic disperser for ultrasonic dispersion for 15 min; weigh 37.5g nine Aluminum nitrate was dissolved in 50ml of deionized water at 60°C, mixed with the dispersed graphene oxide-ethanol suspension, and then placed in an ultrasonic disperser for ultrasonic dispersion for 15 min, and then placed in a water bath at a constant temperature of 60°C. After standing for 4 h, it was put into a blast drying oven at 120 °C for 12 h to evaporate the water remaining in the impregnated product. Finally, under nitrogen protection, the heating rate was controlled at 2 °C / min, the temperature was gradually increased to 400 °C, and the catalyst was calcined for 4 h. The product taken out is a graphene-supported alumina catalyst, and the mass ratio of the carrier to the active component is 4:96. The catalyst is named as: Al 2...

Embodiment 2

[0042]Select the catalyst unsupported activated alumina, named Al 2 O 3 -GO0, for comparison.

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

[0044] The reaction results showed that methanol conversion was 19%, methylal selectivity was 81%, PODE 2 Selectivity is 15%, PODE 3 Selectivity is 3%, PODE 4 The selectivity is 1%.

Embodiment 3

[0046] The catalyst HZSM-5 was selected as a comparison.

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

[0048] The reaction results showed that methanol conversion was 85%, methylal selectivity was 76%, PODE 2 Selectivity is 18%, PODE 3 Selectivity is 4%, PODE 4 The selectivity is 1%.

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Abstract

The invention discloses a controllable hydrophilic-hydrophobic catalyst for preparing polyoxymethylene dimethyl ether, a preparation method and application thereof. The catalyst includes a hydrophobic carrier and an active component, the active component is a solid acid substance, wherein the hydrophobic carrier accounts for 2-98% by weight of the catalyst, and the active component accounts for 2-98% by weight of the catalyst. By adjusting the ratio of hydrophobic agent and active component, its hydrophobic performance can be regulated. The catalyst prepared by the present invention can be applied in the reaction of preparing polyoxymethylene dimethyl ether from methanol formaldehyde, wherein methyl alcohol can be replaced by dimethyl ether and methylal and polyoxymethylene dimethyl ether with a low degree of polymerization, and the type of formaldehyde can be For different concentrations of formaldehyde solution, paraformaldehyde, paraformaldehyde. The catalyst of the present invention has the function of adjusting the distribution of polyoxymethylene dimethyl ether products, and can realize reasonable optimization of the hydrophilic and hydrophobic properties of the catalyst according to production requirements, and realize reaction optimization and separation optimization. This is in line with the requirements for the development of green chemistry.

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 polymethoxydimethyl 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] Polymethoxymethylene dimethylethers (PODEn, DMMn for short, English name Polyoxymethylene dimethylethers) have attracted widespread attention due to their high oxygen content and similar physical and chemical properties to diesel. Polymethoxy dimethyl ether is a continuous C-O structure and does not contain C-C bonds in the molecule. This excellent molecular structure makes it as a diesel additive can effectively improve the cetane number of diesel, increase the oxygen content of fuel and promote combustion, greatly Reduce the emission of pollutants such as nitrogen oxides and sulfides, and improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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