A method for refining and purifying polyoxymethylene dialkyl ether

A formaldehyde dialkyl ether and product technology, which is applied in the refining and extraction process field of diesel fuel additive-polyoxymethylene dialkyl ether, can solve the problems of poor extraction efficiency, poor extraction rate of extraction unit and poor purity of extracted products, etc. High operational safety, high extraction efficiency, and simple process effects

Active Publication Date: 2015-09-30
DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] For this reason, the technical problem to be solved by the present invention is to find out the influence reasons of the extraction rate of the extraction unit and the poor purity of the extraction product through in-depth research on the extraction unit process of polyoxymethylene dialkyl ether in the prior art, and then provide A refined extraction process that can significantly improve the extraction rate and product purity to solve the problem of poor extraction efficiency

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  • A method for refining and purifying polyoxymethylene dialkyl ether
  • A method for refining and purifying polyoxymethylene dialkyl ether

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Embodiment 1

[0048] This embodiment provides a method for refining and purifying polyoxymethylene dialkyl ether, specifically:

[0049] S1. Add aqueous sodium hydroxide solution to the equilibrium product of polyoxymethylene dialkyl ether, the input amount of sodium hydroxide is 20% of the mass of the equilibrium product, the mass concentration of aqueous sodium hydroxide solution is 10%, and heat to 50°C for reaction , for 2 hours;

[0050] S2, the mixture obtained in step S1 is left to stand for stratification, the upper liquid is collected, and anhydrous K accounting for 10% of the upper liquid mass is added 2 CO 3 Drying is carried out, and the filtrate is obtained after the drying is completed;

[0051] S3. Carry out graded atmospheric distillation on the filtrate, distill off the fraction before 60°C, the initial boiling point ~60°C is the unreacted raw material (formaldehyde, methanol and methylal), and the fraction collected at ~110°C is the dimerization product (PODE 2 ), the ...

Embodiment 2

[0053] This embodiment provides a method for refining and purifying polyoxymethylene dialkyl ether, specifically:

[0054] S1. Add aqueous sodium hydroxide solution to the equilibrium product of polyoxymethylene dialkyl ether, the input amount of sodium hydroxide is 20% of the mass of the equilibrium product, the mass concentration of aqueous sodium hydroxide solution is 20%, and heat to 50°C for reaction , for 2 hours;

[0055] S2, the mixture obtained in step S1 is left to stand for stratification, the upper liquid is collected, and anhydrous K accounting for 10% of the upper liquid mass is added 2 CO 3 Drying is carried out, and the filtrate is obtained after the drying is completed;

[0056] S3. First carry out atmospheric distillation on the filtrate, distill out the fraction before 60°C, the initial boiling point ~ 60°C is the unreacted raw material (formaldehyde, methanol and methylal); then use vacuum distillation, the vacuum degree is 0.01MPa , the fraction collect...

Embodiment 3

[0058] This embodiment provides a method for refining and purifying polyoxymethylene dialkyl ether, specifically:

[0059] S1. Add aqueous sodium hydroxide solution to the equilibrium product of polyoxymethylene dialkyl ether, the input amount of sodium hydroxide is 20% of the mass of the equilibrium product, the mass concentration of aqueous sodium hydroxide solution is 30%, and heat to 50°C for reaction , for 2 hours;

[0060] S2, the mixture obtained in step S1 is left to stand for stratification, the upper liquid is collected, and anhydrous K accounting for 10% of the upper liquid mass is added 2 CO 3 Carry out drying, obtain filtrate after drying;

[0061] S3. Perform atmospheric distillation on the filtrate, the temperature at the bottom of the tower is 100° C., and the reflux ratio is 1. The production liquid at the top of the tower consists of methanol, methylal and a small amount of dimerization products; Then carry out fractional atmospheric pressure distillation...

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Abstract

The invention relates to a method for refining and purifying polyformaldehyde dialkyl ether. By deeply researching the extraction unit technique of the polyformaldehyde dialkyl ether in the prior art, the invention finds out the reasons for influencing the extraction yield of the extraction unit and the purity of the extraction product, thereby providing a refinement extraction technique capable of enhancing the extraction yield and product purity. A proper amount of sodium hydroxide is added into the polyformaldehyde dialkyl ether balance product to remove formaldehyde in the polyformaldehyde dialkyl ether balance system. Under the refinement and purification conditions provided by the invention, the sodium hydroxide can easily break the complexation system between the formaldehyde and the polyformaldehyde dialkyl ether with different polymerization degrees, and the products with different polymerization degrees can be refined and purified by a conventional technique, such as distillation and the like.

Description

technical field [0001] The invention belongs to the fields of coal-based energy chemical industry, clean energy and chemical process refining, and specifically relates to a refining and extraction process of polyoxymethylene dialkyl ether, a diesel additive. Background technique [0002] Surveys in recent years have shown that the apparent consumption of diesel in my country has reached about 167 million tons, resulting in frequent shortages of diesel supply (the domestic demand ratio of diesel and gasoline is about 2.5:1, while the current output ratio is about 2.3:1) . In addition to institutional reasons such as unreasonable pricing of different types of oil products and slow linkage between domestic refined oil prices and international crude oil prices, the fundamental reason is the constraints of resource shortages. Traditionally, oil is used as raw material for diesel production. China's relatively "rich in coal, poor in oil, and low in gas" resource endowment has made...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/303C07C41/56C10L10/12C10L1/185
CPCC07C41/58C07C41/56
Inventor 洪正鹏商红岩郭振国刘晨光左飞
Owner DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST
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