Method and device for separation ethane and ethylene by absorption by a solvent and hydrogenation of the solvent phase and regeneration of the solvent

摘要

Separating a mixture of ethane and ethylene from vapocracking effluent containing hydrogen, methane, ethylene, ethane, acetylene, methacetylene, propadiene, propene and at least 4C hydrocarbons comprises passing through an adsorption column, hydrogenating, distilling, distilling again and recycling the recovered solvent. Separating a mixture of ethane and ethylene from vapocracking effluent containing hydrogen, methane, ethylene, ethane, acetylene, methacetylene, propadiene, propene and at least 4C hydrocarbons comprises adsorbing a charge using a cooled solvent phase and an adsorption column(s) to give a gas phase containing H2 and CH4 and a solvent phase containing ethylene, ethane, acetylene, methacetylene, propadiene, propene and at least 4C hydrocarbons, hydrogenating the liquid phase in a catalyzed hydrogenation zone(s) to give a (partially) hydrogenated liquid phase not containing acetylene, regenerating the liquid phase in a first distillation-regeneration column(s) to recover a gas phase that is condensed to give a vapor phase and a liquid phase containing at least 2C hydrocarbons and a solvent phase, passing the hydrocarbon phase through a second distillation-recuperation column to recover a phase that is condensed to give a light gas phase, a mixture comprising ethane and ethylene and a 3+C hydrocarbon fraction, cooling the solvent and reintroducing in to the adsorption column. An Independent claim is included for the apparatus used comprising an adsorption columns, a charge entry point, a column head, a cooling device, a gas exit, a liquid phase exit, a hydrogenation effluent exit, two distillation columns with cooling device, gas exits, condensation and exit device and recycling device.