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Production method for dimethyl ether

A production method and technology of dimethyl ether, applied in the field of dimethyl ether production, can solve problems such as energy waste, high energy consumption, and increased production cost of dimethyl ether, so as to reduce production cost, increase heat exchange area, and achieve good economical efficiency. benefit effect

Inactive Publication Date: 2014-11-19
SUIPING CHEM FACTORY OF CHINA PINGMEI SHENMA GRP LANTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heat used in the current dimethyl ether production process comes from the medium-temperature and medium-pressure steam produced by the circulating fluidized bed boiler, which consumes a lot of energy and consumes a large amount. The remaining heat of the steam after use is difficult to be utilized, and the heat loss is high. , causing a waste of energy and increasing the production cost of dimethyl ether

Method used

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  • Production method for dimethyl ether

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Embodiment 1

[0020] The dimethyl ether production method of the present embodiment comprises the following steps:

[0021] 1) The raw material methanol enters the methanol vapor-liquid separator, and is vaporized into methanol vapor by heating at 260°C. The methanol vapor is further heated to 320°C by the heat exchanger and enters the dimethyl ether reactor. In the presence of a catalyst, methanol dehydration occurs at 380°C Reaction generates crude methyl ether gas;

[0022] 2) The crude methyl ether gas obtained in step 1) is preheated to 120°C by the crude methyl ether preheater and enters the rectification system, and the low-pressure steam with a pressure of 0.55MPa and a temperature of 260°C passes through the reboiler of the rectification system to The crude methyl ether gas is heated and rectified to obtain the refined dimethyl ether product;

[0023] 3) The still liquid produced by the rectification in step 2) enters the recovery system, and the low-pressure steam with a pressure...

Embodiment 2

[0027] The production method of present embodiment dimethyl ether comprises the following steps:

[0028] 1) The raw material methanol enters the methanol vapor-liquid separator, and is vaporized into methanol vapor by heating at 280°C. The methanol vapor is further heated to 325°C through the heat exchanger and enters the dimethyl ether reactor. In the presence of a catalyst, methanol dehydration occurs at 395°C Reaction generates crude methyl ether gas;

[0029] 2) The crude methyl ether gas obtained in step 1) is preheated to 121°C by the crude methyl ether preheater and then enters the rectification system, using low-pressure steam with a pressure of 0.60 MPa and a temperature of 240°C to pass through the reboiler of the rectification system The crude methyl ether gas is heated and rectified to obtain the refined dimethyl ether product;

[0030] 3) The still liquid produced by the rectification in step 2) enters the recovery system, and the low-pressure steam with a press...

Embodiment 3

[0033] The dimethyl ether production method of the present embodiment comprises the following steps:

[0034] 1) The raw material methanol enters the methanol vapor-liquid separator, and is vaporized into methanol vapor by heating at 270°C. The methanol vapor is further heated to 325°C by the heat exchanger and enters the dimethyl ether reactor. In the presence of a catalyst, methanol dehydration occurs at 390°C Reaction generates crude methyl ether gas;

[0035] 2) The crude methyl ether gas obtained in step 1) is preheated to 119°C by the crude methyl ether preheater and then enters the rectification system, and the low-pressure steam with a pressure of 0.55MPa and a temperature of 260°C passes through the reboiler of the rectification system to The crude methyl ether gas is heated and rectified to obtain the refined dimethyl ether product;

[0036] 3) The still liquid produced by the rectification in step 2) enters the recovery system, and the low-pressure steam with a pre...

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Abstract

The invention discloses a production method for dimethyl ether, which comprises the following steps: 1) feeding a raw material methanol into a methanol vapor-liquid separator, vaporizing the methanol into methanol vapor by heating, further heating the methanol vapor to 320-325 DEG C by a heat exchanger, feeding the methanol vapor into a dimethyl ether reactor, and in the presence of a catalyst, carrying out a methanol dehydration reaction at a temperature of 380-395 DEG C, so that crude methyl ether gas is generated; and 2) after the crude methyl ether gas obtained in the step 1) is preheated to 119-121 DEG C by a crude methyl ether preheater, feeding the crude methyl ether gas into a distillation system, passing the crude methyl ether gas through a reboiler of the distillation system so as to heat the crude methyl ether gas by using low-pressure vapor, so that a fine dimethyl ether product is produced by distilling. According to the production method, a situation that a dimethyl ether system obtains enough heat, so that the production is running stably is ensured; the stepped utilization of vapor is realized, and the heat of vapor is maximumly utilized, and therefore, a problem that when an original dimethyl ether system uses medium-pressure vapor, a large amount of low-pressure vapor is emptied, so that the wasting of resources is caused, is solved; and the method saves resources, reduces the production cost, and has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of dimethyl ether production, and in particular relates to a method for producing dimethyl ether. Background technique [0002] Dimethyl ether, abbreviated as DME, is a colorless, oxygen-containing compound with a slight ether fragrance. It has been widely used as an anesthetic, aerosol, refrigerant and various organic synthesis raw materials in the chemical and pharmaceutical industries; it can also be directly Used as engine fuel and domestic fuel. [0003] According to the steps, the production method of dimethyl ether can be divided into one-step synthesis gas method and two-step methanol dehydration method, and the two-step methanol dehydration method is further divided into methanol gas-phase catalytic dehydration method and methanol liquid-phase catalytic dehydration method. Since there are still many risks in the application of one-step synthesis gas to DME in engineering, especially large-scale equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/42C07C41/09
CPCC07C41/09C07C41/42C07C43/043
Inventor 周文生刘宏伟齐辉吴学文周志超
Owner SUIPING CHEM FACTORY OF CHINA PINGMEI SHENMA GRP LANTIAN CHEM
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