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PSA and hydrogen production

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I. technical introduction

In this process, methanol and desalted water with convenient source are used as raw materials. At 220-280 ℃, the special catalyst is used to catalyze the conversion into main conversion gas containing hydrogen and carbon dioxide. The principle is as follows:

Main reaction: CH3OH = CO + 2H 2 + 90.7 kJ / mol

CO+H2O=CO2+H2 -41.2 KJ/mol

Total reaction: CH3OH + H2O = CO2 + 3h2 + 49.5 kJ / mol

Side reaction: 2ch3oh = CH3OCH3 + h2o-24.9 kJ / mol

CO+3H2=CH4+H2O -+206.3KJ/mol

After cooling and condensing, the conversion gas generated by the above reaction is composed of

H2 73~74%

CO2 23~24.5%

CO ~1.0%

CH3OH 300ppm

H2O saturation

It is easy to separate and extract pure hydrogen by PSA.

At present, there are nearly 100 enterprises applying this technology in our country. It has been proved by operation in recent years that this technology is mature, easy to operate, stable and pollution-free.

II. Technical characteristics

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1. Methanol steam cracking and conversion are completed in one step on special catalyst.

2. With the pressurized operation, the generated conversion gas can be directly sent to the PSA separation device without further pressurization, reducing the energy consumption.

3. Compared with electrolysis, power consumption is reduced by more than 90%, production cost is reduced by 40-50%, and hydrogen purity is high. Compared with coal gasification, the process is simple and stable. Although the raw material cost of coal gasification is a little low, the long process investment is large, and the pollution is large, the impurities are many, and the desulfurization and purification are needed, which is not suitable for small and medium-sized units.

4. The special catalyst has the characteristics of high activity, good selectivity, low operating temperature and long service life.

5. Heat transfer oil is used as the carrier of circulating heat supply, which meets the process requirements, with less investment, low energy consumption and reduced operating costs.