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Method for preparing low-polymerization-degree polyformaldehyde dialkyl ether from petroleum fractions and application

A technology of formaldehyde dialkyl ether and low degree of polymerization, which is applied in the petroleum industry, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high degree of polymerization and low effective content, and achieve simple preparation process, The effect of increasing the output ratio and reducing the olefin content

Active Publication Date: 2013-08-21
DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] For this reason, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the polymerization degree of polyoxymethylene dimethyl ether as a diesel additive is relatively high and the effective content is low, and then provide a method for preparing polyoxymethylene dimethyl ether with a low degree of polymerization. Alkyl ether method

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  • Method for preparing low-polymerization-degree polyformaldehyde dialkyl ether from petroleum fractions and application

Examples

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Effect test

Embodiment 1

[0047] Preparation of Polyoxymethylene Dialkyl Ether C with Low Polymerization Degree from Petroleum Fractions n h 2n+1 O(CH 2 O) m C n h 2n+1 The method is:

[0048] In the batch type autoclave, add petroleum C sequentially according to the molar ratio of 2:4 5 1. Industrial formaldehyde with a formaldehyde content of 37%. The water contained in industrial formaldehyde can be used as an initiator to participate in the reaction. Select p-toluenesulfonic acid, which accounts for 2% of the total weight of the reactants, as a catalyst and put it into the reaction kettle, and fill it with nitrogen replacement reaction The air in the kettle, the initial pressure in the reactor is controlled to 0.2Mpa, and the reaction temperature is maintained at 70-90°C for 10 hours with stirring at 100rpm until the components are balanced. After the reaction is completed, go through the above-mentioned extraction and separation process steps, separate and finally collect the fraction at 15...

Embodiment 2

[0051] Preparation of Polyoxymethylene Dialkyl Ether C with Low Polymerization Degree from Petroleum Fractions n h 2n+1 O(CH 2 O) m C n h 2n+1 The method is:

[0052] In the batch type autoclave, add petroleum C sequentially according to the molar ratio of 4:1:4 4 , methanol, a mixture of anhydrous low-polymerization paraformaldehyde and anhydrous formaldehyde, wherein methanol is used as an initiator to trigger the reaction, and a strong acidic cation exchange resin accounting for 5% of the total weight of the reactants is selected as a catalyst and put into the reaction kettle together , filling the inert gas to replace the air in the reactor, controlling the initial pressure in the reactor to 0.3Mpa, and maintaining a constant temperature of 90-120° C. for 10 hours under stirring at 100 rpm. After the reaction is completed, go through the above-mentioned extraction and separation process steps, separate and finally collect the fraction at 150-340° C., and refine the ...

Embodiment 3

[0055] Preparation of Polyoxymethylene Dialkyl Ether C with Low Polymerization Degree from Petroleum Fractions n h 2n+1 O(CH 2 O) m C n h 2n+1 The method is:

[0056] In the intermittent high-pressure reactor, add catalytically cracked light gasoline 30-70°C distillate, methanol and anhydrous paraformaldehyde in a molar ratio of 3:1:2. Methanol is used as an initiator to trigger the reaction. Select the total weight of the reactants. The mixture of 0.1% trifluoromethanesulfonic acid and p-toluenesulfonic acid is put into the reactor together as a catalyst, and the air in the nitrogen replacement reactor is charged, and the initial pressure in the reactor is controlled at 0.6Mpa, and kept under stirring at 100rpm. 50-70°C constant temperature reaction for 10 hours. After the reaction is completed, go through the above-mentioned extraction and separation process steps, separate and finally collect the fraction at 150-340° C., and refine the obtained product. According to...

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Abstract

The invention belongs to the technical fields of energy chemical industry and clean diesel components and in particular relates to a method for preparing low-polymerization-degree polyformaldehyde dialkyl ether from main raw materials such as a petroleum C4 component, an alkadiene-removed petroleum C5 component, a catalytic cracking light petroleum 30-90-DEC C fraction low-carbon monoolefine and the like. The structural general formula of the low-polymerization-degree polyformaldehyde dialkyl ether is CnH2n+1O(CH2O)mCnH2n+1, wherein m is an integer from 1 to 5; and n is an integer from 2 to 5. The low-polymerization-degree polyformaldehyde dialkyl ether prepared by the method has a higher CN value, can be applied to diesel fuel widely and effectively without high polymerization degree andhas a relatively simple preparation process. The byproducts petroleum C4 and C5 in the petroleum cracking ethylene process and the catalytic cracking petroleum 30-90-DEC C light fraction serve as theraw materials, so production cost is greatly saved by using low-carbon olefin in the raw materials, a good technical route is provided for comprehensive utilization of a large number of byproducts inthe petroleum cracking process, and remarkable economic significance is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy chemical industry and clean diesel components, and specifically relates to a main raw material such as utilizing petroleum C4 components, petroleum C5 components after removing diolefins, catalytic cracking light gasoline 30-90°C distillate low-carbon monoolefins, etc. A method for preparing polyoxymethylene dialkyl ether with a low degree of polymerization and its application. Background technique [0002] In recent years, with the continuous increase of petroleum consumption and the enhancement of people's environmental awareness, the requirements for the emission of pollutants such as fuel consumption and smoke of internal combustion engines powered by petroleum have become increasingly stringent. Many countries in the world have successively formulated strict environmental protection regulations . A relatively simple, economical, effective and easy way to improve fuel quality and reduce harmfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/303C07C41/56C10L1/185
Inventor 商红岩洪正鹏李洪娟
Owner DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST
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