Hydrogen production plant

The pyrolysis gas must be the gas coming out of the methanol converter. In the reaction between methanol and water, an excess amount of water is used; in other words, the ratio of water to methanol is such that there is more water than methanol. As a result, the excess water in the pyrolysis gas exists in the form of steam. Theoretically, the ratio of methanol to water should be 52:48 (on a mass percentage basis), but in actual operation, this ratio ranges from 42 to 50, depending on the activity of the catalyst. At an outlet temperature of around 230°C, there should be no condensate in the pyrolysis gas exiting the converter; any occurrence of such condensate is likely due to poor insulation in the lower part of the converter as well as in the pipes. After the pyrolysis gas and the feed liquid are cooled by heat exchange, condensate is formed. This condensate passes through a purification tower and a gas-liquid separator before going to the PSA unit. If liquid is present when it enters the PSA unit, then it’s simple to check whether there are any issues with the separation efficiency of the separator or with the demister at the outlet.