Gas after dehydration flows through cooling heat exchanger and R – 22 refrigerating machine into heavy hydrocarbon- oil and gas process equipmentgas liquid separator. Rich methane gas rises from the gas liquid separator top and is reheated by refrigeration heat exchanger, liquid is withdrawn from the bottom of the gas-liquid separator. R-23 refrigerating machine is in charge of providing cold energy for De-ethanizer condenser.

Rich ethane gas rises from the top of ethane tower and is reheated by refrigeration heat exchanger, heavy hydrocarbon fluid at the bottom of ethane tower is pumped out into the butane distillation tower. Through distillation, propane can be obtained at the top of the De-propanizer, the liquid on the bottom of the De-propanizer flows to the De-butanizer.

Through distillation, butane can be obtained at the top of the De-butanizer, and stable light hydrocarbons on the bottom.

Client can mix the propane and butane to the desire LPG specification.