Production technology for preparing methanol by continuous oxidation of methane

A production process and methanol technology are applied in the production process field of methanol liquid-phase continuous oxidation of methane, which can solve the problems of industrial production providing design parameters and design basis, inability to adjust, and high pressure, reducing the effective interface area and improving production efficiency. , the effect of stable production conditions

Active Publication Date: 2010-01-27
HANERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these studies are all batch reactions. The reaction pressure is determined by the initial pressure of methane fed into the autoclave and the reaction temperature. Not only is the pressure high, but it cannot be adjusted, and the reaction rate also changes with

Method used

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  • Production technology for preparing methanol by continuous oxidation of methane
  • Production technology for preparing methanol by continuous oxidation of methane
  • Production technology for preparing methanol by continuous oxidation of methane

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The specific operation process is as above. The solvent is 50wt% oleum, in which elemental iodine is dissolved as a catalyst, and the methane gas and the catalyst-dissolved solvent are preheated to a reaction temperature of 200° C., a residence time of 25 min, and a reaction pressure of 4 MPa. When the ratio of the volume flow rate of methane to solvent is 200:1, and the mass ratio of solvent to catalyst is 1:0.005, the conversion rate of methane can reach 77% and the selectivity of methanol can reach 92%. The packing of the packing bubble column is Ф3 porcelain bowl packing, and the packing method is random packing.

[0039] The mass spectrogram of the dimethyl sulfate obtained by the rectification of the liquid phase product in the reaction process and the standard mass spectrogram of dimethyl sulfate, such as image 3 as shown, image 3 The first spectrum in the figure is the mass spectrum of the experimental measurement of dimethyl sulfate, and the second is the s...

Embodiment 2

[0041] The specific operation process is as above. The solvent is 50wt% oleum in which elemental iodine is dissolved as a catalyst, and the methane gas and the catalyst-dissolved solvent are preheated to a reaction temperature of 180° C., a residence time of 10 min, and a reaction pressure of 2 MPa. When the ratio of the volume flow rate of methane to solvent is 300:1, and the mass ratio of solvent to catalyst is 1:0.0005, the conversion rate of methane can reach 70% and the selectivity of methanol can reach 93% through measurement and calculation. The packing of the packing bubble column is Ф3 porcelain bowl packing, and the packing method is random packing.

Embodiment 3

[0043] The specific operation process is as above. The solvent is 50wt% oleum, in which sodium iodide is dissolved as a catalyst, and the methane gas and the catalyst-dissolved solvent are preheated to a reaction temperature of 160° C., a residence time of 20 min, and a reaction pressure of 1 MPa. When the volume flow rate ratio of methane to solvent is 100:1, and the mass ratio of solvent to catalyst is 1:0.01, the conversion rate of methane can reach 60% and the selectivity of methanol can reach 93.8%. The packing of the packed bubble column is Ф3 ceramic ring packing, and the packing method is regular packing.

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Abstract

The invention discloses a production technology for preparing methanol by continuous oxidation of methane, comprising the following steps: methane gas and solvent dissolved with catalyst are respectively preheated to the reaction temperature of 160-220 DEG C and are added into a packed bubbling tower from the entrance of the bottom of the packed bubbling tower, and the two flow upward and pass through the packed bubbling tower, and the retention time is 10-40min; the reaction pressure is 1-6MPa, liquid phase product of methyl hydrogen sulphate is generated by reaction, and methanol is obtained by rectification and hydrolysis; and the reacted tail gas is discharged from the exit of the top of the packed bubbling tower. The invention has the advantages of simple technology, low running cost, selection of suitable reactor and capability of continuous production, belonging to the field of methanol production.

Description

technical field [0001] The invention relates to a production process for preparing methanol by direct oxidation of methane, specifically a production process for preparing methanol by continuously oxidizing methane in liquid phase by using a packed bubble column as a reactor. Background technique [0002] Methane is an important chemical raw material, but due to the unusually stable chemical structure of methane, the traditional methane-to-methanol process requires pyrolysis of methane and water vapor under high temperature and high pressure, or partial decomposing of methane and pure oxygen under high temperature and high pressure conditions. Oxidation to produce synthesis gas (CO+H 2 ), and then synthesize methanol under high pressure and high temperature conditions. Although this process is mature, the investment is huge. Only the investment in methane pyrolysis or partial oxidation to synthesis gas accounts for more than 70% of the total investment, and the energy consu...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/48C07C29/12
Inventor 肖钢侯晓峰李锋伟李波王波
Owner HANERGY TECH
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