Methanol Decomposition to Hydrogen

Short Description:

Methanol Decomposition

Under certain temperature and pressure, methanol and steam undergo methanol cracking reaction and carbon monoxide conversion reaction to generate hydrogen and carbon dioxide with the catalyst. This is a multi-component and multi reaction gas-solid catalytic reaction system, and the chemical equation is as follows:

CH3OH → CO +2H2(1)

H2O+CO → CO2 +H2(2)

CH3OH +H2O → CO2 +3H2(3)

Hydrogen and carbon dioxide produced by reforming reaction are separated by pressure swing adsorption (PSA) to obtain high-purity hydrogen.


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Methanol Decomposition

Under certain temperature and pressure, methanol and steam undergo methanol cracking reaction and carbon monoxide conversion reaction to generate hydrogen and carbon dioxide with the catalyst. This is a multi-component and multi reaction gas-solid catalytic reaction system, and the chemical equation is as follows:
CH3OH → CO +2H2(1)
H2O+CO → CO2 +H2(2)
CH3OH +H2O → CO2 +3H2(3)
Hydrogen and carbon dioxide produced by reforming reaction are separated by pressure swing adsorption (PSA) to obtain high-purity hydrogen.

Principle of Methanol Decomposition

Methanol Decomposition to Hydrogen
Methanol and desalted water are mixed in a certain proportion, and sent to the vaporization tower after preheating by the heat exchanger. The vaporized water methanol steam enters the reactor after super-heating in the heat exchanger, then carries out catalytic cracking and conversion reaction in the catalyst bed to produce cracking gas that contains about 74% hydrogen and 24% carbon dioxide. After heat exchange, cooling and condensation, it enters the water washing absorption tower, the tower collects the unconverted methanol and water for recycling, and the product gas is sent to the PSA device for purification.

PSA Purification / PSA Hydrogen Production
PSA hydrogen production takes the mixed gas containing hydrogen as the raw material, according to the principle of pressure swing adsorption, the difference of the adsorption capacity on the molecular sieve surface and the diffusion rate of hydrogen, nitrogen, CO2, CO and other gases to achieve the process of pressurized adsorption and vacuum desorption to complete the separation of hydrogen and other gases to obtain hydrogen with the required purity. All the process uses the special molecular sieves and programmable controller.

Process Flow Diagram

Technical Parameters

Dew Point

≤-60

Hydrogen Purity

99%~99.9995%

Hydrogen Flow Rate

5~5000Nm3/h

Process Flow of Methanol Decomposition

Features of Methanol Decomposition

☆ Methanol steam is cracked and transformed in one step with special catalyst.
☆ Pressurized operation reduces energy consumption, which means the generated conversion gas can be directly sent to the pressure swing adsorption separation without further pressurization.
☆ The characteristics of special catalyst includes high activity, good selectivity, low service temperature and long service life.
☆ Using heat transfer oil as circulating heat supply carrier to satisfy the process requirements and reduce operation cost.
☆ Full considered the recycling of system energy, so that the reaction temperature and overall operation energy consumption cost is low.
☆ The equipment operates automatically and can be unattended in the whole process.
☆ The purity of product gas is high and can be adjusted in 99.0 ~ 99.999% based on the requirements of customer.
☆ Using the special adsorbent with excellent performance.
☆ Using the pneumatic special program control valve of anti scour and stem seal self compensation type.

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