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Method for preparing low-polymerization-degree polyformaldehyde dialkyl ether from mixture of lower alcohols and application thereof

A formaldehyde dialkyl ether and low-carbon mixed alcohol technology, applied in the preparation of organic compounds, chemical instruments and methods, liquid carbon-containing fuels, etc., can solve the problems of low effective content and high polymerization degree requirements, and achieve the preparation process Simple, good process technology route, obvious economic effect

Inactive Publication Date: 2011-09-14
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

[0014] For this reason, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the polyoxymethylene dimethyl ether as a diesel additive requires a higher degree of polymerization resulting in a lower effective content, 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 mixture of lower alcohols and application thereof
  • Method for preparing low-polymerization-degree polyformaldehyde dialkyl ether from mixture of lower alcohols and application thereof

Examples

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Effect test

Embodiment 1

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

[0048] Add low-carbon mixed alcohol and anhydrous low-degree-of-polymerization paraformaldehyde in the batch-type high-pressure reactor in a molar ratio of 1:2, and choose to account for about 2% of the total mass of low-carbon mixed alcohol and anhydrous low-polymerization-degree paraformaldehyde P-toluenesulfonic acid is used as a catalyst to catalyze and put into the reactor together, fill the air in the reactor with nitrogen, control the initial pressure of the reactor to 0.2Mpa, and keep the reaction at a constant temperature of 90-100°C for 12 hours under stirring at 100rpm. 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 the detection by chromatography-...

Embodiment 2

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

[0052] The mixture of low-carbon mixed alcohol, anhydrous trioxane and anhydrous formaldehyde obtained in the alcohol production process is sequentially added in a molar ratio of 1:1 to the intermittent high-pressure reactor, and the low-carbon mixed alcohol, anhydrous trimer 5% of the total mass of formaldehyde and anhydrous formaldehyde is put into the reaction kettle together as a catalyst, and the air in the reaction kettle is replaced by filling inert gas. -200°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. The GC-MS method shows that the product distribution of each degree of polymerization is: m=1, 27.6%; m=2, 20.4%; m...

Embodiment 3

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

[0056]Add low-carbon mixed alcohol and anhydrous paraformaldehyde successively in the proportion of molar ratio 2:3 in the intermittent high-pressure reactor, and select trifluoromethanesulfonic acid and The mixture of p-toluenesulfonic acid is put into the reaction kettle together as a catalyst, and the air in the reaction kettle is replaced by nitrogen gas, the initial pressure of the reaction kettle is controlled to 0.6Mpa, and the reaction temperature is maintained at 70-90°C for 10 hours under stirring at 100rpm. 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 the detection by GC-MS method, the product distribution of each degree of polymerization is: m=1...

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Abstract

The invention belongs to the technical fields of clean utilization of coal and clean diesel fuel and particularly relates to a preparation method of a low-polymerization-degree polyformaldehyde dialkyl ether capable of serving as a fossil diesel fuel additive. The structural general formula of the low-polymerization-degree polyformaldehyde dialkyl ether is shown as CnH2n+10(CH2O)mCnH2n+1, wherein m is an integer of 1-5, and n is an integer of 1-5. The prepared low-polymerization-degree polyformaldehyde dialkyl ether has a high CN value, can be widely and effectively applied to a diesel fuel without high polymerization degree, and has a relatively simple preparation process; and fusel serving as a byproduct in the industrial process of alcohol brewing or the mixture of lower alcohols produced in a Fischer-Tropsch synthesis reaction is taken as a raw material which can be used without purification treatment, so that the production cost is greatly saved, a good process technical route is provided for the comprehensive utilization of a large quantity of mixtures of lower alcohols produced in industry, and a remarkable economic benefit is achieved.

Description

technical field [0001] The invention belongs to the technical field of clean utilization of coal and clean diesel fuel, and in particular relates to a preparation method and application of low-polymerization polyoxymethylene dialkyl ether which can be used as an additive for fossil diesel fuel. Background technique [0002] Since the two oil crises in the 1970s, energy development and environmental protection have become two strategic themes for the survival and development of human society. With the continuous consumption of natural resources, it is very urgent to actively seek and develop new energy systems. From the perspective of the world's energy structure, coal accounts for 78.9%, while oil accounts for only 6.6%. As the world's largest coal-producing country, my country's energy structure with rich coal and little oil is more obvious. From the perspective of resource utilization and environmental protection, it is of great strategic significance and application pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/303C07C41/56C10L1/04C10L1/185
Inventor 商红岩洪正鹏
Owner DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST
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