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Method for preparation of polyoxymethylene dimethyl ethers through catalysis of pyrrolidone ionic liquid

A polyoxymethylene dimethyl ether, catalytic preparation technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of complex preparation process and low catalyst activity, and achieve simple reaction process and high catalytic activity. , easy to control effect

Active Publication Date: 2012-11-21
如东文园投资开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of low catalyst activity and complicated preparation process in the prior art, and provide a preparation method of polyoxymethylene dimethyl ether

Method used

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  • Method for preparation of polyoxymethylene dimethyl ethers through catalysis of pyrrolidone ionic liquid
  • Method for preparation of polyoxymethylene dimethyl ethers through catalysis of pyrrolidone ionic liquid
  • Method for preparation of polyoxymethylene dimethyl ethers through catalysis of pyrrolidone ionic liquid

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Effect test

Embodiment 1

[0035] In a 100ml autoclave, add 6.0wt% catalyst a, 15.98g paraformaldehyde, and 7.54g methylal in sequence. Inflate nitrogen to a pressure of 3 MPa, slowly heat to 140°C and stir for 4 hours, after cooling and standing still, the product is analyzed by gas chromatography, and its composition distribution is as follows (expressed in weight %): methylal, 41.6%; n=2, 26.7%; n=3, 12.7%; n=4, 5.9%; n=5~8, 11.9%, n>8, margin.

Embodiment 2

[0037] In a 100ml autoclave, 10.0wt% catalyst b, 13.96g paraformaldehyde, and 31.71g methylal were sequentially added. Inflate nitrogen gas to a pressure of 3.5 MPa, slowly heat to 95°C and stir for 7 hours, after cooling and standing still, the product is analyzed by gas chromatography, and its composition distribution is as follows (expressed in weight %): methylal, 36.8%; n=2, 27.6% ; n=3, 13.6%; n=4, 6.8%; n=5~8, 13.8%, n>8, margin.

Embodiment 3

[0039] In a 100ml autoclave, add 5.0wt% catalyst c, 6.03g paraformaldehyde, and 12.08g methylal in sequence. Inflate nitrogen to a pressure of 1 MPa, slowly heat to 110°C and stir for 6 hours, after cooling and standing still, the product is analyzed by gas chromatography, and its composition distribution is as follows (expressed in weight %): methylal, 31.8%; n=2, 29.9%; n=3, 15.6%; n=4, 7.7%; n=5~8, 14.2%, n>8, margin.

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Abstract

Belonging to the technical field of ionic liquid catalysis, the invention relates to a method for preparation of polyoxymethylene dimethyl ethers through catalysis of a pyrrolidone ionic liquid. The method takes paraformaldehyde and methylal, trioxymethylene and methanol or trioxymethylene and methylal as raw materials, and adopts a pyrrolidone ionic liquid as a catalyst for catalytic preparation of polyoxymethylene dimethyl ethers. When the reaction finishes, the ionic liquid and the product can undergo automatic phase splitting. The ionic liquid used in the invention has a simple preparation process and a low price. The invention has the advantages that: (1) the catalyst has high catalytic activity and less consumption; (2) the catalyst has low toxicity and is easily biodegradable; (3) the reaction conditions are mild, and the reaction time is short; and (4) the reaction process is simple, the product is well distributed after reaction, and the raw material utilization rate is high.

Description

technical field [0001] The invention relates to a method for preparing polyoxymethylene dimethyl ether by using pyrrolidone ionic liquid as a catalyst, and belongs to the technical field of ionic liquid catalysis. Background technique [0002] Polyoxymethylene dimethyl ether as a diesel additive is a general term for a class of substances with the molecular formula CH 3 (CH 2 O) n CH 3 , where n is equal to 2~11, they have high cetane number (up to 76 on average) and high oxygen content (45%~49%), and good miscibility with diesel oil, suitable for general oil additives Polyoxymethylene dimethyl ether (DMM) with 3≤n≤8 3-8 ), the blending quality with diesel is higher than that of ultra-low sulfur diesel, adding 10%-30% to diesel can greatly reduce NO x , CO and soot emissions, reduce exhaust pollution by more than 50%, and can significantly increase the lubricity of diesel oil, so it is considered to be an environmentally friendly fuel additive component with great appli...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56C07C41/50
Inventor 李为民赵强邱玉华任庆功何明阳陈群
Owner 如东文园投资开发有限公司
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