Energy-saving dimethyl ether production flow and apparatus thereof

A production device, a technology for dimethyl ether, which is applied in the field of new processes and devices, can solve the problems of wasting energy, reducing the thermodynamic efficiency of the separation process, and being unfavorable to economic benefits, so as to reduce the required energy, save equipment investment, and improve speed and efficiency. The effect of balancing conversion rates

Inactive Publication Date: 2008-11-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in this patented technology, because the separation of reaction product and unreacted matter adopts direct conventional rectification column sequence, promptly separates in sequence according to the relative volatilities of each component in the system, in the dimethyl ether rectification column by From top to bottom, the methanol content increases first and then decreases, and the middle component methanol remixes, which reduces the thermodynamic efficiency of the separation process; The water and methanol contained in the incoming liquid stream are heated and vaporized again, which wastes a lot of energy and is not conducive to improving economic benefits

Method used

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  • Energy-saving dimethyl ether production flow and apparatus thereof
  • Energy-saving dimethyl ether production flow and apparatus thereof
  • Energy-saving dimethyl ether production flow and apparatus thereof

Examples

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Effect test

Embodiment 1

[0027] Embodiment 1: as figure 1 In the process shown, the bottom of the next-wall rectification column is heated by a reboiler, the operating pressure of the column is 0.9MPa, there are 11 theoretical plates in the top area 1 (including the condenser, the same below), and 32 theoretical plates in the left area 2 , there are 37 theoretical plates in zone 3, and 8 theoretical plates in zone 4 (including reboiler, the same below). The output flow rate of the reaction system is 5400kg / h, the pressure is 0.9MPa, the temperature is 135°C, the dimethyl ether content is 50% (mass fraction, the same below), the methanol content is 20%, and the water content is 30%. The middle part of distillation column area 2 enters. The raw material methanol is 2700kg / h, the temperature is 20°C, the methanol content is 99%, the water content is 1%, and it is added from the 31st theoretical plate (counted from the top of the tower, the same below). The dimethyl ether product is extracted from the t...

Embodiment 2

[0028] Embodiment 2: as figure 1 As shown in the flow process, the bottom of the rectifying column with the next wall is heated with a reboiler, the operating pressure of the column is 1MPa, and the number of theoretical plates in each area is the same as that of Example 1. The output flow rate of the reaction system is 5250kg / h, the pressure is 1MPa, the temperature is 140°C, the content of dimethyl ether is 45%, the content of methanol is 20%, and the content of water is 35%. The raw material methanol is 3000kg / h, the temperature is 30°C, the methanol content is 90%, and the water content is 10%, which is added from the 43rd theoretical plate. The dimethyl ether product is extracted from the top of the tower with a flow rate of 2362.5kg / h, of which the dimethyl ether content is 99.992%; the methanol vapor is extracted from the 15th theoretical plate and used as the feed of the reaction system for dehydration reaction with a flow rate of 3760.5kg / h, the methanol content is ...

Embodiment 3

[0029] Embodiment 3: as figure 1 As shown in the flow process, the bottom of the rectifying column is heated with a reboiler, the operating pressure of the column is 1MPa, and the number of theoretical plates in each area is the same as in Example 2. The output flow rate of the reaction system is 5250kg / h, the pressure is 1MPa, the temperature is 140°C, the content of dimethyl ether is 46%, the content of methanol is 18%, and the content of water is 36%. Raw material methanol 2850kg / h, temperature is 30 ℃, wherein methanol content is 80%, and water content is 20%, and its feeding position is the same as example 2. The dimethyl ether product is extracted from the top of the tower, the flow rate is 2415kg / h, and the dimethyl ether content is 99.992%; the methanol vapor is extracted from the rectifying column area 3 of the next wall, and the extraction position is the same as that of embodiment 2, and it is carried out as the feed of the reaction system Dehydration reaction, the...

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Abstract

The invention relates to a new energy-saving technique and a device for composing dimethyl ether by utilizing carbinol, which is characterized by integrating the separation of a reaction product and a substance not reacted as well as the gasification of the raw materials into a tower to be carried out simultaneously. The device of the invention consists of a reaction system and a dividing wall rectification column; the dividing wall rectification column is provided with a block of clapboard on the vertical direction in a normal rectification column; thereby dividing the inner cavity of the rectification column into four areas which are an upper area, a lower area, a left area and a right area; a dimethyl ether product is obtained from the top parts of the reaction product and the substance not reacted output from the reaction system after being separated by the dividing wall rectification column; a gas phase logistics taking carbinol as a main component is obtained from a side line as the incoming stock of the reaction system; while the water in the system is discharged from the bottom of the rectification column; simultaneously, the raw material, carbinol, containing unpurified water enters the rectification column from the right side of the dividing wall to obtain the carbinol and the water in gas phase. The invention can be used for various manufacture techniques and devices by using the carbinol in gas phase to catalyze and compose the dimethyl ether, can reduce device investment to a large extent, simplify the flows as well as reduce energy consumption and operation cost.

Description

technical field [0001] The invention relates to a novel process and device for producing dimethyl ether by gas-phase catalytic dehydration method using methanol as raw material. Background technique [0002] At present, dimethyl ether is mainly used as a spray carrier in the aerosol industry. In recent years, the use of dimethyl ether has been continuously developed. For example, it can be used as a medical aerosol propellant, a mixed refrigerant, and can also be used as an alternative fuel for gasoline and diesel engines. It can directly replace petroleum liquefied gas as civil fuel; in addition, dimethyl ether can also be used as a raw material for the production of low-carbon olefins. Under the condition of increasingly tight oil resources, the potential market for using dimethyl ether as a clean fuel and for the production of low-carbon olefins is undoubtedly very huge. [0003] The preparation process and equipment of dimethyl ether (DME) generally include reaction sys...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/09
Inventor 孙兰义李天文杨德连李军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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