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Dimethyl ether preparation technology by utilizing methanol dehydration and special equipment thereof

A dimethyl ether and dimethyl ether rectifying tower technology, which is applied in the dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc., can solve the problems of large technical energy consumption and the like

Inactive Publication Date: 2010-11-10
SHANGHAI WUJING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the present invention overcomes the defect that the energy consumption of the existing two-step process for producing dimethyl ether is relatively large, and the mature two-step process for producing dimethyl ether is generally adopted in China as a technological basis On the one hand, it provides a methanol dehydration process to dimethyl ether with lower energy consumption and less investment, and optimizes the operating conditions of the production process

Method used

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  • Dimethyl ether preparation technology by utilizing methanol dehydration and special equipment thereof
  • Dimethyl ether preparation technology by utilizing methanol dehydration and special equipment thereof
  • Dimethyl ether preparation technology by utilizing methanol dehydration and special equipment thereof

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Embodiment 1～4

[0056] Refer to attached figure 1 , in combination with the equipment used in the present invention, further more clearly and completely illustrate the process of preparing dimethyl ether from methanol dehydration of the present invention. Except for the specific operating conditions, it is consistent with the following operations: the raw material methanol is passed through the inlet connected to the raw material port. Feed pump 1, then through the first pipeline and the second pipeline split, a part through the first pipeline through the alcohol lotion inlet into the alcohol washing tower 8 as alcohol washing tower alcohol lotion, another part of the liquid methanol through the second pipeline and methanol pre- The cold fluid inlet of the heater 2 enters the methanol preheater 2 for preheating, and comes out of the cold fluid outlet of the methanol preheater 2, then passes through the inlet of the methanol vaporizer 3, enters the methanol vaporizer 3 for vaporization, and is ...

Embodiment 5～7

[0061] When the entire heat exchange network is fully utilized, the process of methanol dehydration to prepare dimethyl ether is carried out. The heat load and parameter data can be seen in Table 2 below.

[0062] Refer to attached figure 1 , its operating steps include: the raw material methanol is passed through the feed pump 1 connected to the raw material port, then through the first pipeline and the second pipeline, and a part is passed through the first pipeline through the alcohol washing agent inlet into the alcohol washing tower 8 as alcohol washing The other part of liquid methanol enters the methanol preheater 2 for preheating through the second pipeline and the cold fluid inlet of the methanol preheater 2, and comes out from the cold fluid outlet of the methanol preheater 2, and then passes through the methanol vaporizer 3 The inlet enters the methanol vaporizer 3 for vaporization, and after vaporization, it comes out from the outlet of the methanol vaporizer 3, an...

Embodiment 8～10

[0065] The heat exchange function of the methanol preheater is canceled, and the process of methanol dehydration to prepare dimethyl ether is carried out while the rest of the heat exchange network is still in use. The heat load and parameter data can be seen in Table 2 below.

[0066]Its operation steps include: passing the raw material methanol through the feed pump 1 connected to the raw material port, and then passing through the first pipeline and the second pipeline to divide the flow, and a part passes through the first pipeline through the alcohol washing agent inlet and enters the alcohol washing tower 8 as the alcohol washing tower Alcohol detergent, another part of liquid methanol passes through the second pipeline, and then enters the methanol vaporizer 3 for vaporization through the inlet of the methanol vaporizer 3. After vaporization, it comes out from the outlet of the methanol vaporizer 3, and then enters the heat exchange from the cold fluid inlet of the heat ...

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Abstract

The invention discloses a dimethyl ether preparation technology by utilizing methanol dehydration, which comprises the following steps that: liquid methanol is vaporized and then enters a heat exchanger to preheat, then dehydration is carried out, so crude gaseous dimethyl ether is obtained, the crude gaseous dimethyl ether enters the heat exchanger again to exchange heat, then exchanges heat with a tower bottom coil heater of a dimethyl ether rectifying tower and / or the tower bottom coil heater of a methanol recovery tower to recover the heat again, and then is cooled and separated, so crudedimethyl ether and noncondensable gas are obtained, then the crude dimethyl ether is rectified in the rectifying tower, condensed fluid is obtained after lateral line discharging or tower top vapor condensation and separation, so the dimethyl ether product is obtained; and in addition, the crude methanol at the bottom of the dimethyl ether rectifying tower is rectified in a methanol recovery and rectification tower, gas is obtained from the tower top, then cooling and separation are carried out, and the condensed fluid is the recycled methanol which is taken as the raw material to be recycledand reused. The invention further discloses special equipment for the dimethyl ether preparation technology by utilizing methyl alcohol dehydration.

Description

technical field [0001] The invention relates to a process for preparing dimethyl ether by dehydrating methanol and special equipment thereof. Background technique [0002] Dimethyl ether (DME for short) is a colorless, non-toxic and basically odorless product with low corrosiveness and a vapor pressure of 0.5Mpa at room temperature. It has similar physical properties to liquefied petroleum gas (LPG) and has no damage to the atmospheric ozone layer. , has degradability in the troposphere of the atmosphere. It has a wide range of uses, and can be used in cosmetics, pharmaceuticals, dyes, aerosol propellants, refrigerants and other industries, as well as fuels and chemical raw materials. The use of CFCs is restricted around the world due to their damaging effects on the atmospheric ozone layer. In recent years, as a substitute for Freon, the use of dimethyl ether in the aerosol and refrigerant industries has increased rapidly. At the same time, with the rising price of petro...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/09
Inventor 张炳琦毛玥陈大胜李彩云姚民忠马永光
Owner SHANGHAI WUJING CHEM
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