Refinery dry gas originates from the secondary processing of crude oil. It mainly contains hydrogen, methane, ethylene, ethane, propylene, propane and other components, but it is often burned as fuel gas, which is a huge waste of resources. If ethylene, propylene, light hydrocarbons (ethylene, ethane, propylene, propane) and hydrogen in refinery gas can be effectively separated and recovered, it is of great significance to realize resource optimization, energy saving and emission reduction, and improve the economic benefits of refinery. DKT has developed an integrated technology of recovering ethylene or ethylene feedstock (light hydrocarbons) and hydrogen by pressure swing adsorption according to the technical requirements of refinery gas utilization.

The whole process mainly includes four parts. First, feed gas pretreatment is used to remove acid gases (CO₂, H₂S, etc.), heavy hydrocarbons, water, etc.; Second, ethylene or ethylene feedstock (C2, C3) in refinery dry gas is separated and concentrated by PSA with special adsorbents; Third, hydrogen is separated and recovered to obtain hydrogen product with a purity of more than 99.9mol%; Fourth, refining of ethylene or ethylene feedstock product gas is adopted to remove all kinds of impurity components to meet the requirements of subsequent processes.

Technical features and advantages:

- Advanced and proven technology, simple process flow and low investment;

- High adsorption capacity and separation coefficient of the special adsorbents for ethylene and light hydrocarbons;

- High purity and recovery of ethylene, light hydrocarbon and hydrogen product;

- Highly integrated and automated plant;

- The separation and recovery cost of ethylene, light hydrocarbon and hydrogen is low, and the economic benefits are high;

Application:

- Separation and recycling of ethylene, light hydrocarbon and hydrogen in refinery gas (catalytic dry gas, reformed gas, etc.);

- Separation and recycling of ethylene from polyethylene tail gas.