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Device and method for converting mixed alcohol

A technology of mixing alcohols and mixed liquids, which is applied in the field of plasma synthesis chemistry to achieve high selectivity

Inactive Publication Date: 2014-06-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are no patents and publications related to the direct preparation of higher alcohols and polyols by plasma conversion of methanol and ethanol, such as: n-propanol, isopropanol, n-butanol, isobutanol, ethylene glycol, 1 , 4-butanediol, 1,3-propanediol, etc.

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  • Device and method for converting mixed alcohol
  • Device and method for converting mixed alcohol
  • Device and method for converting mixed alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Using hydrogen as the carrier gas, the mixed solution of hydrogen, methanol and ethanol (85% methanol content, 15% ethanol content) is transported to the heat exchanger for vaporization, and then enters the line-barrel reactor. The feed molar ratio of hydrogen and mixed alcohol is 2.0, and the residence time of mixed alcohol in the discharge interval of the reactor is 2.0s; the shell of the line-barrel reactor (Fig. 1-1) also serves as a barrier medium, and its outer diameter is 12mm, the tube wall thickness is 1.0mm, the electrode spacing is 5mm, the high voltage pole electrode is white steel wire with a diameter of 2.0mm; The interval length is 200mm; when the discharge frequency and discharge power are kept unchanged at 7kHz and 20W respectively, the reaction conditions are normal temperature and pressure, and the material of the reactor shell is adjusted, the reaction result is:

[0099] Quartz glass, the conversion rate of methanol is 10.49%, the selectivity of eth...

Embodiment 2

[0105]Repeat Example 1, but the reactor adopts a double dielectric barrier discharge reactor (Fig. 1-2), and its shell and inner casing are made of polytetrafluoroethylene, wherein the thickness of the inner barrier medium tube is 0.3mm, and the outer diameter is 3.0mm and the length is 300.0mm. Then the reaction result is: the conversion rate of methanol is 6.32%, the selectivity of ethylene glycol is 19.41%, and the selectivity of isopropanol, propanol, sec-butanol, isobutanol and n-butanol is respectively 2.78%, 3.23%, 3.56%, 4.21%, 3.12%.

[0106] This example shows that when the double barrier medium is used, the energy of the electrons generated by the discharge is further lowered, and the conversion rate of methanol is further lowered, while the selectivity of ethylene glycol is improved, while the selectivity of ethanol and n-propanol is reduced .

Embodiment 3

[0108] Repeat embodiment 2, but when total barrier medium thickness (sum of internal and external barrier medium thickness) changes, then reaction result is:

[0109] The thickness of the medium is 1.0mm, the conversion rate of methanol is 23.47%, the selectivity of ethylene glycol is 6.41%, the selectivity of isopropanol, propanol, sec-butanol, isobutanol and n-butanol are 2.18%, 3.56%, 2.48%, 3.37%, 2.61%.

[0110] The thickness of the medium is 1.5mm, the conversion rate of methanol is 18.75%, the selectivity of ethylene glycol is 8.72%, the selectivity of isopropanol, propanol, sec-butanol, isobutanol and n-butanol are 3.24%, 2.45%, 2.51%, 3.23%, 2.45%.

[0111] The medium thickness is 2.0mm, the conversion rate of methanol is 15.23%, the selectivity of ethylene glycol is 10.33%, the selectivity of isopropanol, propanol, sec-butanol, isobutanol and n-butanol are 2.88%, 2.57%, 3.24%, 2.45%, 3.42%.

[0112] The thickness of the medium is 3.0mm, the conversion rate of meth...

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Abstract

The invention belongs to the chemical field of plasma synthesis, and relates to a device and a method for converting mixed alcohol. Mixed liquid of methanol and ethanol is heated in a heat exchanger to be evaporated into steam, and the steam is conveyed to a dielectric barrier discharge reactor of a line-cylinder type electrode structure, a needle-plate type electrode structure, a tube-plate type electrode structure or a plate-plate type electrode structure. A casing of the reactor is insulated, and dielectric barrier of the reactor is made of inert materials. When the reactor runs, discharge voltage, discharge frequency, reaction temperature, reaction pressure and reactant retention time of an additional high-voltage power supply are set, and carrier gas takes more than one kind or two kinds of oxygen, nitrogen, hydrogen, argon, helium, water vapor, carbon monoxide, carbon dioxide, methane and ethane to be mixed. The methanol can be obtained through coal-formed synthesis gas, and the ethanol can be obtained through conversion of biomass, and the methanol and the ethanol are reproducible. The method that plasmas are used for preparing polyatomic alcohol and high carbon alcohol belongs to one-step method synthesis, and no catalyst is used, thereby being environment-friendly and high in selectivity.

Description

technical field [0001] The invention belongs to the field of plasma synthesis chemistry and relates to a new method for directly preparing higher-carbon alcohols and polyols from methanol and ethanol mixtures. Background technique [0002] Methanol and ethanol are important basic organic chemical raw materials with a wide range of uses. It can be used in the synthesis of dimethyl ether, olefins, hydrogen, gasoline, carbonates, aromatics, acetaldehyde, acetic acid, propionic acid, dibutyl ether, ethyl acetate, dimethyl ether, vinyl acetate, etc. Due to the rich coal resources, the coal-to-methanol industry has developed rapidly and has a large production capacity. Therefore, it has broad prospects to produce various high value-added chemical products from methanol; and ethanol can be obtained from biomass conversion. Therefore, as a New, renewable and clean energy sources are also receiving more and more attention. [0003] Some of the following patents and publications rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/08C07C29/36C07C31/20
Inventor 郭洪臣张婧袁启超
Owner DALIAN UNIV OF TECH
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