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Method for converting methanol

A methanol and reactor technology, applied in the field of direct preparation of ethylene glycol from methanol, can solve the problems of difficult industrialization, environmental pollution, long production process flow, etc., and achieve the effect of high selectivity

Inactive Publication Date: 2013-11-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has mature technology and large output, but the production process is long, the equipment is large, the energy consumption is high, the environmental pollution is serious, and the cost of ethylene glycol is high.
Other new methods of synthesizing ethylene glycol are facing many problems, and industrialization is difficult

Method used

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  • Method for converting methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0113] Under the pressure of 0.1MPa, He and gaseous methanol are passed into the discharge reactor at a molar ratio of 9:1 (the flow rate of He is 27ml / min, and the flow rate of methanol is 3ml / min). Block discharge. Use a hard glass tube with an outer diameter of 9 mm and an inner diameter of 6 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 100mm.

[0114] The discharge parameters of the reactor are: voltage 8.5kV, current 0.38A, frequency 15kHz; other reaction conditions of the reactor are: the residence time of the reactants in the discharge area is 4.2s, and the discharge temperature is 130°C. Then the react...

Embodiment 2

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

[0116] Under the pressure of 0.15MPa, the N 2and gaseous methanol in a molar ratio of 3:1 (wherein N 2 The flow rate is 18ml / min, and the methanol flow rate is 6ml / min) into the discharge reactor. After the airflow is stable, the plasma power supply is turned 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 9mm, the outer diameter of the inner tube is 4mm, the inner diameter is 2mm, and the center electrode is a copper wire with a diameter of 2mm, grounded A cylindrical stainless steel mesh (mesh 150) 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 120 mm.

[0117] The discharge parameters of the reac...

Embodiment 3

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

[0119] Under the pressure of 0.02MPa, CO and gaseous methanol are passed into the discharge reactor at a molar ratio of 4:1 (the flow rate of CO is 24ml / min, and the flow rate of methanol is 6ml / min). Block discharge. The reactor is made of a hard glass tube with an outer diameter of 8mm and an inner diameter of 6mm. 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 3mm. The dielectric is a 1mm-thick Single layer mica, pole spacing is 6mm.

[0120] The discharge parameters of the reactor are: voltage 17.6kV, current 0.65A, frequency 8.5kHz; other reaction conditions of the reactor are: the residence time of reactants in the discharge area is 0.28s, and the discharge temperature is 550°C. Then the reaction result is: methanol conversion rate 75%, ...

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Abstract

The invention belongs to the field of plasma synthesis chemistry, and relates to a method for directly preparing glycol by methanol. The invention is characterized in that the methanol molecules are selectively activated by selecting discharge methods such as dielectric barrier discharge, corona discharge, pulse corona discharge, glow discharge, radio frequency discharge, glide arc discharge, or microwave plasma; then the retention time of the reaction mixture in a reaction zone, the discharge reaction temperature, the discharge reaction pressure, and the molar ratio of carrier gas and methanol are set; and the selectively activated methanol is converted into the target product. The invention adopts methanol as a raw material to prepare glycol, and methanol has various source modes, and has reproducibility. The method belongs to one-step synthesis technology, does not need catalysts, has no pollution to environment, and has high selectivity. The invention not only obtains glycol, but also realizes combined production of ethanol and n-propanol through condition optimization, and has very good industrial application prospects.

Description

technical field [0001] The invention belongs to the field of plasma synthesis chemistry and relates to a method for directly preparing ethylene glycol from methanol. Background technique [0002] Methanol is an important basic organic chemical raw material with a wide range of uses. The most notable ones are used in the synthesis of dimethyl ether and olefins; in addition, hydrogen, gasoline, carbonates, aromatics, ethanol, ethylene glycol, carbonylation of acetic acid and fuels, etc. Due to abundant coal resources, the coal-to-methanol industry has developed rapidly and has a large production capacity. Therefore, starting from methanol, the production of various high value-added chemical products has broad prospects. [0003] 很多公开文献和专利涉及了甲醇转化反应,以下专利涉及了甲醇转化制烯烃反应,如:CN1084431A;CN1359753A;CN1704390A;CN101172918A;CN101182276A;CN10830769A;CN1333737A;CN1404462A;CN1431982A;CN1662477A;CN1683079A;CN1795156A;CN1847203A;CN1923366A ;CN101172246A;CN101239326A;CN101239875A;CN101279281A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/32B01J19/08
CPCY02P20/52
Inventor 郭洪臣张婧袁启超
Owner DALIAN UNIV OF TECH
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