Natural gas recovery of light hydrocarbons and dehydration process
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As stated in the title, a certain gas consists of 79.4% methane, 2.68% ethane, 2.3% isobutane, 3.01% n-butane, 0.92% isopentane, 0.58% n-pentane, and 0.46% n-hexane; other substances are also present, but their volume percentage is so small that they can be ignored. Recovery of light hydrocarbons and dehydration are required, with a dew point of -55 degrees after dehydration. How is it best to arrange the process? I would like to ask for advice
A drying process and a demethanization tower are required. A certain stage of the ethylene cracking process can be used as a reference.
The total proportion of all the gas components is only 86.77%; what is the component that makes up the remaining 13.33%? Please provide the components. The proportions of various components above ethane are too low; the investment is high, the returns are low, and the value of recovery is minimal. Given the current composition of the gases, a dew point of -55 degrees after dehydration is not sufficient. Since the concentrations of components other than ethane are already very low, a lower temperature is required to remove these hydrocarbons; such a temperature must be above -55 degrees to avoid the formation of hydrates.
Based on the parameters currently available, some specific issues need to be addressed. If it is necessary to recover C1 and C2, pressure swing adsorption can be used first to recover CH4 and C2, removing all macromolecular components above C4. Moisture can also be removed incidentally. We have similar units for associated gas from oil fields, dry gas from refineries, and in the pesticide industry. If the poster is interested, they can send me the specific parameters at scly8844@163.com for further discussion and exchange.
I’ve been on business trips outside; the project hasn’t started yet. I’ll send you the parameters later