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Ethanol conversion method

An ethanol and reactor technology, applied in the field of ionic synthesis chemistry, to achieve the effect of high selectivity

Inactive Publication Date: 2012-04-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1: Single dielectric barrier discharge --- wire barrel reactor

[0113] Under the pressure of 0.11MPa, He and gaseous ethanol are passed into the discharge reactor at a molar ratio of 5:1 (the flow rate of He is 25ml / min, and the flow rate of ethanol is 5ml / min). Block discharge. Use a hard glass tube with an outer diameter of 9 mm and an inner diameter of 7 mm to make a cylindrical reactor (also used as a barrier medium), the central electrode is an iron wire with a diameter of 3 mm, and the ground electrode is a cylindrical aluminum foil tube with a wall thickness of 1 mm (close to the glass tube. outer wall), the pole spacing is 3mm, and the effective discharge length of the reactor is 120mm.

[0114] The discharge parameters of the reactor are: voltage 12.5kV, current 0.36A, frequency 14.5kHz; other reaction conditions of the reactor are: the residence time of the reactant in the discharge area is 8s, and the discharge temperature is 230°C. Then the reacti...

Embodiment 2

[0115] Example 2: Double Dielectric Barrier Discharge --- Wire Barrel Reactor

[0116] Under the pressure of 0.12MPa, the N 2 and gaseous ethanol in a molar ratio of 6:1 (wherein N 2 The flow rate is 36ml / min, and the ethanol flow rate is 6ml / min) into the discharge reactor, and after the airflow is stable, the plasma power supply is switched on for dielectric barrier discharge. A cylindrical reactor is made of double-layer polytetrafluoroethylene tube (also used as a barrier medium), in which the outer diameter of the outer tube is 11mm, the inner diameter is 8mm, the outer diameter of the inner tube is 4mm, the inner diameter is 2mm, the center electrode is a copper wire with a diameter of 2mm, grounded Cylindrical copper mesh (180 mesh) with a wall thickness of 1 mm and close to the outer wall of the polytetrafluoroethylene tube, the pole spacing is 4.5 mm, and the effective discharge length of the reactor is 180 mm.

[0117] The discharge parameters of the reactor are: v...

Embodiment 3

[0118] Example 3: Single dielectric barrier discharge --- tube-sheet reactor

[0119] Under the pressure of 0.05MPa, CO and gaseous ethanol are passed into the discharge reactor at a molar ratio of 8:1 (the flow rate of CO is 48ml / min, and the flow rate of ethanol is 6ml / min). Block discharge. The reactor is made of a hard glass tube with an outer diameter of 9mm and an inner diameter of 7mm. It adopts a tube-sheet electrode structure. The high-voltage pole is an iron tube with an outer diameter of 3mm and an inner diameter of 2mm. The ground pole is a circular tungsten plate with a radius of 3.5mm. mm of single-layer mica with a pole spacing of 4mm.

[0120] The discharge parameters of the reactor are: voltage 15.8kV, current 0.55A, frequency 10.5kHz; other reaction conditions of the reactor are: the residence time of reactants in the discharge area is 0.58s, and the discharge temperature is 460°C. Then the reaction result is: ethanol conversion rate 13%, acetaldehyde selec...

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Abstract

Belonging to the chemical field of plasma synthesis, the invention relates to a method for direct preparation of polyols and higher alcohols from ethanol. The method is characterized by: choosing dielectric barrier discharge, corona discharge, pulsed corona discharge, glow discharge, radio frequency discharge, gliding arc discharge or microwave plasma and other discharge methods to perform selective activation to ethanol molecules, then setting the residence time of a reaction mixture in a reaction zone, the discharge reaction temperature, the discharge reaction pressure, and the mole ratio between a carrier gas and ethanol, conversing the selectively activated ethanol into target products. The method of the invention adopts ethanol as the raw material for preparing polyols and higher alcohols, while ethanol has various sources and renewability. The method provided in the invention belongs to a one-step synthesis technology, and has the advantages of no need for catalyst, no environmental pollution, as well as high selectivity.

Description

technical field [0001] The invention belongs to the field of plasma synthesis chemistry and relates to a new method for directly preparing high-carbon alcohols and polyhydric alcohols from ethanol. Background technique [0002] Ethanol is an important basic organic chemical raw material with a wide range of uses. Most notably, it is used in the synthesis of low-carbon olefins such as ethylene, propylene, and butene; in addition, it can also be used to produce hydrogen, gasoline, aromatics, acetaldehyde, acetic acid, propionic acid, dibutyl ether, ethyl acetate, dimethyl Ether, vinyl acetate, etc. Since ethanol can be obtained by converting biomass, it has attracted more and more attention as a new type of renewable clean energy. [0003] 很多公开文献和专利涉及了乙醇转化反应,以下专利涉及了乙醇转化制乙烯的反应,如:CN101941878A;CN101172919;CN101274285;CN101565346;CN101121625;CN101121624;CN101768041A;CN101941879A;CN101993325A;CN101121626;CN86101615;CN101993326A;CN101134704; CN101244970;CN102070388A;CN101560133;C...

Claims

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Application Information

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IPC IPC(8): C07B60/00C07C31/02C07C31/10C07C31/12C07C29/32C07C29/60C07C9/06C07C9/08C07C11/04C07C11/24C07C1/20C07C47/06C07C45/00C01B3/22C01B31/18C01B31/20C01B32/40C01B32/50
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 郭洪臣张婧袁启超
Owner DALIAN UNIV OF TECH
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