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Process for preparing dimethyl ether

A technology of dimethyl ether and methanol, applied in ether preparation, ester reaction to prepare ether, organic chemistry, etc., can solve the problems of high by-product sulfuric acid, large consumption of raw materials, etc., and achieve high utilization rate of raw materials, low equipment requirements, and energy consumption. reduced effect

Inactive Publication Date: 2009-07-22
HANERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the disadvantage of this preparation process is that the consumption of raw materials is large, and the by-product sulfuric acid is too much

Method used

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  • Process for preparing dimethyl ether

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Effect test

Embodiment 1

[0041] Add dimethyl sulfate and methanol to the stainless steel alcoholysis kettle C. The molar ratio of dimethyl sulfate to methanol is 1:2. The alcoholysis is carried out at 35°C for 1 hour. The vaporized gas is collected by condensation and drying, and then subjected to gas chromatography. Analysis shows that the gas phase composition contains 98% dimethyl ether; after quantitative analysis, the conversion rate of dimethyl sulfate is 82% and the selectivity is 100%.

Embodiment 2

[0043] Pass the methane into the reactor A, and at the same time pass the dissolved catalyst I 2 Contains fuming sulfuric acid, which contains 30% SO 3 , Catalyst I 2 The concentration of is 0.0014mol / L, and the reaction is performed at a temperature of 200℃ and a pressure of 0.1MPa; then the mixture containing methyl hydrogen sulfate obtained after the reaction is introduced into SO 3 In distillation tower B, distill at 35℃ for 72 hours to remove SO 3 ; After the distillation, the mixture containing dimethyl sulfate and methyl hydrogen sulfate is introduced into the alcoholysis kettle C, and methanol is slowly added. The molar ratio of sulfuric esters to methanol is 1:1.2, and the temperature is 180°C. After 1.5h of alcoholysis, the vaporized gas is collected by condensation and drying, and analyzed by gas chromatography. The gas phase composition contains 99% of dimethyl ether; after quantitative analysis, the conversion rate of sulfate esters is 100%, and the selectivity is 100...

Embodiment 3

[0045] Pass the methane into the reactor A, and at the same time pass the fuming sulfuric acid with the catalyst sodium iodide and potassium iodide, the fuming sulfuric acid contains 40% SO 3 , The total concentration of the catalyst sodium iodide and potassium iodide is 0.011mol / L, and the reaction is performed at a temperature of 150°C and a pressure of 15MPa; then the mixture containing methyl hydrogen sulfate obtained after the reaction is introduced into SO 3 In distillation tower B, distill at 200℃ for 10 hours to remove SO 3 ; The mixture containing dimethyl sulfate and methyl hydrogen sulfate obtained after distillation is introduced into the alcoholysis kettle C, and methanol is slowly added. The molar ratio of sulfate esters to methanol is 1:1.8, and the temperature is 50 ℃ After alcoholysis for 2h, the vaporized gas is collected by condensation and drying, and analyzed by gas chromatography. The gas phase composition contains 98% of dimethyl ether; after quantitative an...

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Abstract

The invention discloses a method for preparing dimethyl ether. The method leads methane to be activated and synthesized into sulfate material which is then added into an alcoholysis reactor together with the methanol; the temperature of the alcoholysis reactor is controlled between 35 DEG C and 180 DEG C and alcoholysis is conducted for 0.5 hour to 5 hours; the dimethyl ether prepared is vaporized from the alcoholysis reactor and collected. The preparing method has the advantages of simple synthetic route, high utilization ratio of raw materials, few byproducts, mild reaction conditions, low energy consumption and being suitable for continuous production and pertains to the field of dimethyl ether preparation.

Description

Technical field [0001] The invention relates to a method for preparing dimethyl ether, in particular to a method for preparing dimethyl ether by methane activation to obtain sulfuric acid esters and then reacting with methanol to prepare dimethyl ether. Background technique [0002] The molecular formula of dimethyl ether (DME) is CH 3 OCH 3 , Colorless and non-toxic, with similar physical properties to liquefied petroleum gas (LPG), it can be used for civil gas, and its cetane number is high, and it can be widely used in vehicle fuels. It has the dual effects of environmental protection and alternative energy. [0003] In industry, the production of dimethyl ether is mainly prepared by dehydration of methanol in the presence of a certain catalyst. The reaction equation is as follows: [0004] 2CH 3 OH→CH 3 OCH 3 +H 2 O [0005] This traditional preparation method has many related patent reports, such as US patents US707606 and US4560807, but the price of dimethyl ether prepared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/16
Inventor 肖钢郑岩蔡旭明王波侯晓峰
Owner HANERGY TECH
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