Method for refining polymethoxy dialkyl ether

A technology of polymethoxydialkyl ethers and products, which is applied in the field of refining process of diesel oil additives-polymethoxydialkyl ethers, can solve the problems that the acid value requirements of the target products cannot be solved at the same time, and achieve easy operation , simple process, mild reaction effect

Inactive Publication Date: 2015-06-03
DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] For this reason, the technical problem to be solved by the present invention is that in the process of refining polyoxymethylene dialkyl ether in the prior art, the problem that the acid value requirement of the target product cannot be solved at the same time, and then provide a method that can significantly improve the extraction rate and the product Purity, and the refined extraction process that can directly obtain products that meet the acid value requirements

Method used

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  • Method for refining polymethoxy dialkyl ether
  • Method for refining polymethoxy dialkyl ether
  • Method for refining polymethoxy dialkyl ether

Examples

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Embodiment 1

[0050] This embodiment provides a method for refining and purifying polymethoxydialkyl ethers, specifically:

[0051] (1) Put the polymethoxydialkyl ether synthetic liquid into the head tank with the reflux device, and enter the ammonia and aldehyde contactor, and the ammonia gas with a purity of 60% enters the ammonia and aldehyde through the ammonia buffer tank Condensation reaction is carried out in the contactor, the ammonia pressure is controlled to 0.02MPa, the ammonia is measured in excess of 0.1% in terms of molar mass, the condensation reaction liquid enters the tube reactor, and the outlet temperature of the reactor is controlled to 50°C;

[0052] (2) Settling the mixture obtained in step (1) for 8-12 hours, mechanically removing impurities, collecting the reaction solution and placing it in an evaporation crystallization kettle, controlling the vacuum degree in the kettle to be 60-85KPa, and the steam pressure to be 0.1-0.3 MPa, the temperature is controlled at 50-8...

Embodiment 2

[0056] This embodiment provides a method for refining and purifying polymethoxydialkyl ethers, specifically:

[0057] (1) Pour the polymethoxydialkyl ether synthesis liquid into the head tank with a reflux device, and enter the ammonia and aldehyde contactor, and the ammonia gas with a purity of 99.99% enters the ammonia and aldehyde through the ammonia buffer tank Condensation reaction is carried out in the contactor, the ammonia pressure is controlled to 0.05MPa, the ammonia is metered over 0.5%, the condensation reaction liquid enters the tube reactor, and the outlet temperature of the reactor is controlled to 55°C;

[0058] (2) Settling the mixture obtained in step (1) for 8-12 hours. After mechanically removing impurities, collect the reaction solution and place it in an evaporation crystallization kettle. Evaporate and crystallize at 60°C; evaporate the light components in the reaction liquid, such as excess ammonia, water, methanol, ethanol, etc. Constant crystallizati...

Embodiment 3

[0062]This embodiment provides a method for refining and purifying polymethoxydialkyl ethers, specifically:

[0063] (1) Put the polymethoxydialkyl ether synthetic liquid into the head tank with the reflux device, and enter the ammonia and aldehyde contactor, and the ammonia gas with a purity of 75% enters the ammonia and aldehyde through the ammonia buffer tank Condensation reaction is carried out in the contactor, the ammonia pressure is controlled to 0.5MPa, the ammonia is metered over 1.2%, the condensation reaction liquid enters the tube reactor, and the outlet temperature of the reactor is controlled to 70°C;

[0064] (2) Settling the mixture obtained in step (1) for 8-12 hours. After mechanically removing impurities, collect the reaction solution and place it in an evaporation crystallization kettle. Evaporate and crystallize at 80°C; evaporate the light components in the reaction liquid, such as excess ammonia, water, methanol, ethanol, etc. Constant crystallization o...

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Abstract

The invention discloses a method for refining polymethoxy dialkyl ether. According to deep research on an extraction unit process of polymethoxy dialkyl ether in the prior art, influencing causes of low extraction rate of the extraction unit and low purity of the extraction product are found, and a refining and extracting process through which the extraction rate and product purity can be obviously improved is further provided. Excessive ammonia gas is added into a balance product of the polymethoxy dialkyl ether, so that the aim of removing formaldehyde in the polymethoxy dialkyl ether balance system is achieved. Meanwhile, the acid value of the reaction product is effectively reduced, so that the requirement on the national standard is met.

Description

technical field [0001] The invention belongs to the field of clean energy chemical industry, and in particular relates to a refining process of polymethoxy dialkyl ether, a diesel additive. Background technique [0002] According to surveys in recent years, the apparent consumption of diesel in my country has reached about 167 million tons, which makes the tight supply of diesel frequently occur (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 the contradiction between its sustained and rapid economic and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/303C07C41/58C10L1/185C10L10/12
CPCC07C41/58C07C43/30
Inventor 商红岩洪正鹏叶子茂向家勇薛真真
Owner DONGFANG HONGSHENG NEW ENERGY APPL TECH RES INST
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