Process for indirectly producing ethanol from dimethyl ether

A technology of dimethyl ether and ethanol, applied in the field of ethanol preparation, can solve the problem of high energy consumption, and achieve the effects of reducing three waste discharges, reducing energy consumption, and reducing energy consumption

Active Publication Date: 2019-03-22
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, the processes of "synthesis gas → methanol → dimethyl ether" and "methyl acetate → ethanol" are very mature at home and abroad, but there are few literature reports on the process of producing methyl acetate from dimethyl ether, "dimethyl ether → methyl acetate → ethanol" "The process is long and the energy consumption is high. How to deal with the acetic acid produced by the side reaction in the process of dimethyl ether carbonylation to produce methyl acetate involves the energy consumption of the device and the discharge of three wastes. Therefore, it is necessary to optimize the process, save energy and reduce emissions. Conducive to industrial plant production

Method used

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  • Process for indirectly producing ethanol from dimethyl ether
  • Process for indirectly producing ethanol from dimethyl ether
  • Process for indirectly producing ethanol from dimethyl ether

Examples

Experimental program
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Embodiment 1

[0032] The process of preparing methyl acetate by carbonylation of dimethyl ether is as follows: figure 1 shown.

[0033] The carbonylation reactor adopts a tubular fixed-bed reactor, which is filled with a modified hydrogen-type zeolite molecular sieve catalyst. The molar ratio of CO to dimethyl ether was 6.0. The reaction temperature is 210°C and the pressure is 5.6Mpa.

[0034] Carbon monoxide raw material gas 1, temperature 30°C, pressure 5.6MPa, forms a mixed gas with recycle gas 17, temperature 60°C, pressure 5.6MPa After being preheated by preheater E1, stream 2 is formed and enters from the top of vaporizer F1. Dimethyl ether raw material liquid 3, temperature 45°C, pressure 5.6MPa and recycled material 18, temperature 46°C, pressure 5.6MPa are preheated by preheater E2 to form stream 4, which enters from the top of vaporizer F1, Fully mix and vaporize in the vaporizer to form a mixed reaction gas 6, and then heat it through the heater E3 to the temperature required...

Embodiment 2

[0037] This embodiment is a comparative example of embodiment 1, further rectification is carried out to the production liquid 19 of the crude fractionation tower tank, and refined methyl acetate is obtained, and its technological process diagram is as follows figure 2 As shown, the specific implementation is as follows:

[0038]The production fluid 19 of the crude fractionation tower kettle has a temperature of 185 ° C and a pressure of 2.0 MPa. The composition and mass fraction of the product are: methyl acetate: 94.84%, acetic acid 5.14%, enter the refining tower, and the operating pressure of the refining tower is 0.2 MPa. The temperature is 78°C, the temperature of the tower kettle is 128°C, and the reflux ratio is 2. After the tower top steam is condensed by the tower top condenser, part of it is refluxed, and part of it is recovered as refined methyl ester, and the content of methyl acetate is 99.9%. The production liquid in the tower kettle is mainly acetic acid, whi...

Embodiment 3

[0040] This embodiment is to carry out the catalytic hydrogenation of methyl acetate to produce ethanol with the product obtained in embodiment 1 or embodiment 2, and the process flow diagram is as follows image 3 shown. The specific implementation is as follows:

[0041] The hydrogenation reactor is loaded with a modified Cu-based catalyst, and the upper and lower parts are filled with stainless steel magnetic rings with comparable particle sizes, and the mixed solution of methyl acetate and acetic acid (Example 1) or refined methyl acetate (Example 2) is used as the filling. For the liquid raw material, a certain amount of hydrogen is introduced, the molar ratio of hydrogen to ester in the reaction gas is controlled to be 30, the reaction temperature is 205°C, and the pressure is 6.0Mpa.

[0042] Hydrogen raw material gas 20, temperature 40°C, pressure 6.0MPa and return gas 32 composed of circulating gas, temperature 60°C, pressure 6.0MPa, after the heat exchange gas E4 is...

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Abstract

The invention provides a process for indirectly producing ethanol by dimethyl ether, and belongs to the technical field of ethanol preparation. In the process, firstly, the dimethyl ether and carbon monoxide are used as raw materials to prepare methyl acetate and acetic acid by carbonylation reaction, the methyl acetate and the acetic acid are catalytically hydrogenated with hydrogen, and the product is purified to obtain an ethanol product. In the process for indirectly producing the ethanol from the dimethyl ether in the invention, the dimethyl ether and the carbon monoxide are used as the raw materials to carry out the carbonylation reaction, and the product methyl acetate and acetic acid are further catalytically reacted with the hydrogen to produce the ethanol. The co-hydrogenation ofthe reacted product methyl acetate and acetic acid after the carbonylation reaction to produce the ethanol avoids the separate separation and treatment of by-product acetic acid as waste acid, reduces energy consumption, and also reduces emissions of three wastes (waste gas, waste water and industrial residue). At the same time, the heat pump rectification of a methanol column in the ethanol separation process further reduces the energy consumption of the device.

Description

technical field [0001] The invention belongs to the technical field of ethanol preparation, in particular to a process for indirect production of ethanol from dimethyl ether. Background technique [0002] Ethanol is an important bulk chemical and energy chemical, widely used in medicine, food, chemical industry, fuel and other industries. Anhydrous ethanol with a volume concentration of more than 99.5% can be used as fuel ethanol. Fuel ethanol is a clean-burning high-octane fuel and is a renewable energy source. As a renewable energy source, fuel ethanol can be directly used as liquid fuel or mixed with gasoline, which can reduce the dependence on non-renewable energy-petroleum and ensure energy security. China's fuel ethanol industry started relatively late, but has developed rapidly. In recent years, with the fluctuation of oil prices and the further increase of domestic oil demand, the diversification strategy of energy supply represented by alternative energy such as et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149C07C69/14C07C67/37C07C53/08C07C51/12
CPCC07C29/149C07C51/12C07C67/37C07C69/14C07C53/08C07C31/08
Inventor 胡玉容李扬刘亚华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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