Method for preparing high-purity dimethyl ether free from extraneous odour

A technology of dimethyl ether and no peculiar smell is applied in the field of preparing high-purity dimethyl ether without peculiar smell, which can solve the problems of peculiar smell and high manufacturing cost, and achieve the effects of low manufacturing cost, simple preparation process and saving production cost.

Active Publication Date: 2013-08-21
YUNNAN REASCEND TOBACCO TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In our country, the methanol raw material prepared from coal is used as a raw material. Due to the large amount of impurities, the dimethyl ether product has an odor problem, and it can basically only be used as fuel; Less methanol raw material, thus high manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material GZ 01 50 tons, measure the raw material methanol content of 75%, PH value ≈ 6.5, add 150.0 kg of NaOH or KOH solution with a concentration of 2%, adjust the pH value of the methanol raw material to 7-8, and use the raw material pump to transport the methanol raw material to the raw material evaporator Evaporate into methanol vapor, enter the synthesis reactor, and use r-AL at a temperature of 250.0°C and a pressure of 0.5MPa 2 o 3 The catalyst is dehydrated in the gas phase to produce dimethyl ether gas. The dimethyl ether gas is input into the condenser to condense into dimethyl ether liquid and stored in the storage tank, and then the dimethyl ether liquid is transported to the first-stage rectification tower by the raw material pump. In the process, under the conditions of tower bottom temperature: 135.0°C, tower top temperature: 37.0°C, and pressure: 0.7MPa, the primary rectification is carried out. When the purity of dimethyl ether in the reflux liqu...

Embodiment 2

[0019] Raw material YN 02 150 tons, measure the raw material methanol content to 85%, PH ≈ 6.8, add 400.0 kg of NaOH or KOH solution with a concentration of 2%, adjust the pH value of the methanol raw material to 7-8, and use the raw material pump to transport the methanol raw material to the raw material evaporator for evaporation into methanol vapor, enter the synthesis reactor, and use r-AL at a temperature of 283.3°C and a pressure of 0.6MPa 2 o 3 The catalyst is dehydrated in the gas phase to produce dimethyl ether gas. The dimethyl ether gas is input into the condenser to condense into dimethyl ether liquid and stored in the storage tank, and then the dimethyl ether liquid is transported to the first-stage rectification tower by the raw material pump. In the process, the primary rectification is carried out at the temperature of the tower bottom of 138.3°C, the temperature of the top of the tower is 37.7°C, and the pressure is 0.7MPa. When the purity of dimethyl ether ...

Embodiment 3

[0021] Raw material SC 03 200 tons, measure the methanol content of the raw material to 90.0%, PH value ≈ 6.8, add 500.0 kg of NaOH or KOH solution with a concentration of 1%, adjust the pH value of the methanol raw material to 7-8, and use the raw material pump to transport the methanol raw material to the raw material evaporator Evaporate into methanol vapor, enter the synthesis reactor, and use r-AL at a temperature of 316.7°C and a pressure of 0.7MPa 2 o 3 The catalyst is dehydrated in the gas phase to produce dimethyl ether gas. The dimethyl ether gas is input into the condenser to condense into dimethyl ether liquid and stored in the storage tank, and then the dimethyl ether liquid is transported to the first-stage rectification tower by the raw material pump. In the process, the primary rectification is carried out at the temperature of the tower bottom of 141.7°C, the temperature of the top of the tower is 38.3°C, and the pressure is 0.8MPa. When the purity of dimeth...

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Abstract

The invention relates to a method for preparing high-purity dimethyl ether free from extraneous odour, which has the following steps: 1.pretreating methanol, the raw material, adjusting pH value thereof to 7-8; 2. evaporating the preheated methanol to obtain methanol vapour, then carrying out gas-phase catalytic dehydration to obtain dimethyl ether; 3.rectifying dimethyl ether; 4. washing the rectified dimethyl ether with alkaline solution. In the invention, with methanol made from coal as the raw material, high-purity dimethyl ether free from extraneous odour can be produced at relatively low cost.

Description

technical field [0001] The invention relates to a method for preparing dimethyl ether, in particular to a method for preparing non-odor high-purity dimethyl ether by using methanol produced from coal as a raw material. Background technique [0002] As a propellant and propellant, dimethyl ether has incomparable and excellent performance in solvents such as propane and ethanol, and it is widely used in the pharmaceutical and cosmetic industries. The dimethyl ether used in cosmetics and medicine requires no peculiar smell, no impurities, and high purity, especially strict restrictions on methanol content. [0003] There are mainly one-step method and two-step method for preparing dimethyl ether. The one-step method is developed on the basis of methanol synthesis technology, and dimethyl ether is synthesized from carbon dioxide and hydrogen in one step. The method has the advantages of short process, low energy consumption and high single-pass conversion rate, but the reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09C07C41/42
Inventor 王保兴杨荣李军杨伟祖陈婉李吉昌王春礼刘德
Owner YUNNAN REASCEND TOBACCO TECH GRP
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