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

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...

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 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

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