Method for producing dimethyl ether from methanol

A technology of dimethyl ether and dimethyl ether distillation tower, which is applied in ether preparation, dehydration of hydroxyl-containing compounds to prepare ether, organic chemistry, etc., can solve problems such as increasing heat energy, reducing reaction speed, and reducing reaction equilibrium conversion rate, etc., to achieve The effect of saving investment and reducing energy consumption

Active Publication Date: 2007-01-03
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0004] Two of the characteristics of the existing method is that the methanol as raw material (comprising the methanol recovered by the methanol recovery tower), no matter how much water content, is all vaporized in the vaporizer or vaporization tower, and the moisture therein is also all vaporized and enters the gas phase dehydration reaction system. Not only increases the heat energy required for water vaporization, but also because water is the product of dehydration reaction, water entering the reaction system not only reduces the reaction speed, but also reduces the equilibrium conversion rate of the reaction

Method used

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  • Method for producing dimethyl ether from methanol
  • Method for producing dimethyl ether from methanol

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Effect test

Embodiment 1

[0039] Vaporization and stripping tower 1 has a theoretical plate number of 24 and an operating pressure of 0.6Mpa (G). The raw material methanol is 2000kg / h, of which methanol is 1600kg / h, water is 400kg / h, and the content of methanol is 80% (wt%). The dimethyl ether rectification tower is a plate tower; the operating gauge pressure is 1.8Mpa (G).

[0040] The raw material methanol 11 is fed from the top of the vaporization stripping tower 1 . Methanol 313.3kg / h and water 645.6kg / h in the still liquid 12 of the dimethyl ether distillation column, the feeding position is at the ninth theoretical plate counted from the top of the vaporization stripping column 1. The steam 13 discharged from the top of the tower is sent to the dehydration reaction system, wherein methanol is 1913kg / h, water is 239.4kg / h, and the methanol content is 88.88% (wt%). The methanol content in the water 14 discharged from the tower kettle is 0.05% (wt%).

Embodiment 2

[0042] Dimethyl ether rectification column 3 has an operating gauge pressure of 0.9Mpa (G), a tower top temperature of 45°C, a total of 26 theoretical plates in the tower, 409.5kg / h of methanol in feed 15, 840.5kg / h of water, and dimethyl ether Ether 1051.3kg / h. The feed plate is at the 15th theoretical plate from the top of the column. All the condensate at the top of the tower flows back into the tower from the top 17, and the reflux ratio is 0.7:1. A dimethyl ether product of 1054.8 kg / h was extracted from the 4th theoretical plate 19 counting from the top of the side line in the upper part of the tower, with a purity of 99.67% (wt%). Methanol 407.3kg / h and water 839.3kg / h in the mixed liquid 12 discharged from the tower kettle of the dimethyl ether rectifying tower 3 are sent to the vaporization stripping tower 1 as raw materials. Vaporization and stripping tower 1 is a packed tower, and the working gauge pressure is 1.6Mpa (G).

Embodiment 3

[0044] Vaporization and stripping tower 1 has a theoretical plate number of 30 and an operating gauge pressure of 0.8 Mpa (G). The raw material methanol is 2000kg / h, of which methanol is 1960kg / h, water is 40kg / h, and the content of methanol is 98% (wt%).

[0045] The raw material methanol 11 is fed from the top of the vaporization stripping tower 1 . Methanol 417.1kg / h and water 555.1kg / h in liquid 12 of dimethyl ether rectification tower still, the feeding position is at the 21st theoretical plate counted from the top of vaporization stripping tower 1. The steam 13 discharged from the top of the tower is sent to the dehydration reaction system 2, wherein methanol is 2376.9kg / h, water is 47.77kg / h, and the methanol content is 98.03% (wt%). The methanol content in the water 14 discharged from the tower kettle is 0.1% (wt%). The dimethyl ether rectification tower is a packed tower, and the operating gauge pressure is 0.3pa(G).

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Abstract

The method can be used for prodn. devices producing dimethyl ether by carbinol gas phase catalyzing. The characteristic is the special technology and structure of vaporization extracting-distilling tank and ingenious combination of vaporization extracting-distilling tank and dimethyl ether rectificating tank, the purpose of recovering carbinol can be realized without building carbinol recovering tank used for separating, purifying and recovering carbinol in mixed liquid in boiler of dimethyl ether rectificating tank. Another characteristic is that two different standard dimethyl ether (the one in them is high purity) can be produced simultaneously by the invention.

Description

Technical field: [0001] The present invention is related to the method for producing dimethyl ether by gas-phase catalytic dehydration with methanol as raw material. Background technique: [0002] The production process of existing methanol gas-phase catalytic dehydration to dimethyl ether (such as the Chinese patent application number 88101729.9 and the Chinese patent application number 95113028.5) is: the raw material methanol is fully vaporized after being heated by a vaporizer or a vaporization tower. The reaction is carried out in the methanol gas phase dehydration reaction system, and the reaction products (including reaction products dimethyl ether, water, unreacted methanol, etc.) from the dehydration reaction system are sent to the dimethyl ether rectification tower for rectification and separation, and the dimethyl ether refined The dimethyl ether product is obtained from the upper part or the top of the distillation tower; while the mixed solution of methanol and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09
Inventor 汤洪李淑芳胡文励王学再林荆黄维柱
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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