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Method for preparing methyl alcohol by continuous methane liquid phase oxidation

A technology for producing methanol and methane, which is applied in the field of continuous liquid-phase oxidation of methane to produce methanol, and can solve problems such as inability to adjust, retention, and high pressure

Inactive Publication Date: 2009-05-20
HANERGY TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, the above 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 time. Most of the experimental results remain in the research of the reaction mechanism. , unable to provide design parameters and design basis for industrial production, there is still a certain distance from industrial application and design

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  • Method for preparing methyl alcohol by continuous methane liquid phase oxidation
  • Method for preparing methyl alcohol by continuous methane liquid phase oxidation

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Embodiment 1

[0021] The concentration of oleum in the present embodiment is 60%, and the iodine concentration in oleum is 1g / 100ml. In order to facilitate the determination of the conversion rate of methane, argon was used as the internal standard gas, and the reaction gas contained 5% argon by volume.

[0022] ①First replace the air in the reaction system with nitrogen, and then use a metering pump to send the oleum dissolved in the catalyst into the sulfuric acid preheater. The oleum in the sulfuric acid preheater is heated to 180°C before entering the The bubble tower is added until it flows out from the overflow port 9 on the top of the bubble tower. Due to the heat dissipation effect of the bubble tower, the temperature of the oleum in the bubble tower will decrease. It is necessary to use heat transfer oil to heat the sulfuric acid in the bubble tower to the set reaction temperature of 180°C, and the reaction will be carried out through the back pressure valve. The pressure is adjus...

Embodiment 4

[0028] The catalyst that embodiment 4 uses is hydrogen iodide, and the consumption of hydrogen iodide in the oleum is calculated as iodine: 1g / 100ml;

Embodiment 5

[0029] The catalyst that embodiment 5 uses is methyl iodide, and the consumption of methyl iodide in the oleum is calculated as iodine: 1g / 100ml;

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Abstract

The invention discloses a preparation method of methanol by methane liquid phase continuous oxidation; and the method adopts a bubble tower or other gas-liquid reactors. In the reaction conditions that the temperature is 160 to 220 DEG C and the pressure is 1 to 6Mpa, the methanol and oleum containing a catalyst are continuously added into a reactor; the methanol is oxidized by SO3 and sulphuric acid, and methyl-hydrogen-sulfate is generated after the reaction; and the methyl-hydrogen-sulfate is hydrolyzed and then methanol can be prepared. Compared with an interval process, the continuous liquid phase oxidation process is characterized by low reaction pressure, stable producing conditions and being more suitable for industrialized production.

Description

technical field [0001] The invention relates to a method for producing methanol by direct oxidation of methane, in particular to a method for producing methanol by liquid-phase continuous oxidation of methane. Background technique [0002] Methane and methane-containing gases are important chemical raw materials. However, due to the unusually stable chemical structure of methane, the traditional methane-to-methanol process requires pyrolysis of methane and water vapor at high temperature and pressure, or the conversion of methane and pure oxygen at high temperature. Partial oxidation is carried out under high pressure to produce synthesis gas (C0+2H 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 the pyrolysis of methane to synthesis gas accounts for more than 70% of the total investment, and the energy consumption of this process is also high. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/48
Inventor 肖钢侯晓峰李波李锋伟王波
Owner HANERGY TECH
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