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 methan

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

Experimental program
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Example Embodiment

[0027] Example 1: Such as figure 1 In the process shown, the bottom of the rectification tower is heated by a reboiler, the operating pressure of the tower is 0.9MPa, the top zone 1 has 11 theoretical plates (including the condenser, the same below), and the left zone 2 has 32 theoretical plates. , Zone 3 has 37 theoretical plates, and Zone 4 has 8 theoretical plates (including reboiler, the same below). The discharge flow rate of the reaction system is 5400kg / h, the pressure is 0.9MPa, the temperature is 135℃, the dimethyl ether content is 50% (mass fraction, the same below), the methanol content is 20%, and the water content is 30%. Enter the middle of the distillation column zone 2. The raw material methanol is 2700kg / h, the temperature is 20°C, the content of methanol is 99%, and the content of water is 1%. It is added from the 31st theoretical plate (counted from the top of the tower, the same below). The dimethyl ether product is drawn from the top of the tower with a flow ...

Example Embodiment

[0028] Example 2: Such as figure 1 In the process shown, the bottom of the dividing wall rectification column is heated with a reboiler, the operating pressure of the column is 1 MPa, and the number of theoretical plates in each zone is the same as in Example 1. The output flow rate of the reaction system is 5250kg / h, the pressure is 1MPa, the temperature is 140°C, the dimethyl ether content is 45%, the methanol content is 20%, and the water content 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 board. The dimethyl ether product is extracted from the top of the tower with a flow rate of 2362.5kg / h, of which the content of dimethyl ether is 99.992%; 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 99.72%, the dimethyl ethe...

Example Embodiment

[0029] Example 3: Such as figure 1 In the process shown, the bottom of the dividing wall rectification tower is heated with a reboiler, the tower operating pressure is 1 MPa, and the number of theoretical plates in each zone 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 dimethyl ether content is 46%, the methanol content is 18%, and the water content is 36%. It enters from the middle of the partition 2 of the rectification column. The raw material methanol is 2850kg / h, the temperature is 30°C, the methanol content is 80%, and the water content is 20%. The feeding position is the same as in Example 2. The dimethyl ether product is extracted from the top of the tower with a flow rate of 2415kg / h, of which the content of dimethyl ether is 99.992%; methanol vapor is extracted from zone 3 of the next-wall rectification column, and the extraction position is the same as that in Example 2, and it...

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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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