SEPARATION TECHNIQUE FOR REACTION MIXTURE OF THERMAL CRACKING PRODUCTS Russian patent published in 2015 - IPC C10G9/00 C10G7/02 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the method including input of a reaction mixture passed through a furnace and reactor for thermal cracking, upon cooling of the reaction mixture by quench to a fractionating column and output of vapours from the top of the fractionating column, delivery of the above vapours upon cooling to a reflux drum with output of gas from the reflux drum top and of a non-stable gasoline fraction from the reflux drum bottom and delivery of the above fraction as live reflux for the fractionating column, with side-streaming of a diesel oil cut through a stripping section and vapours of the stripping section from the fractionating column back to the same column and output of the residue from the fractionating column bottom with water vapour delivery to the bottom of the fractionating column and stripping section. At that from the reflux drum upon heating in the heat exchanger by liquid from the stripping column boiler a balancing part of the non-stable gasoline fraction is delivered to the top of the stripping column while to its bottom vapour is entered from the boiler top, from upper trays of the fractionating column side stream of the gasoline fraction is outputted and delivered to the top of the stripping column and from its boiler bottom a stable gasoline fraction is outputted, vapours from the stripping column top mixed up with the gas from the reflux drum are delivered to the absorber bottom, while to the absorber top an absorbing agent - the cooled diesel cut - is delivered upon output from the delivery zone to the stripping section of the fractionating column, gas is outputted from the absorber top, at that one part of the absorber residue is used as quench for the reaction mixture while the other part is delivered to the fractionating column upstream the extraction zone of the diesel cut as the upper circulating reflux. The column also features the lower circulating reflux.

EFFECT: increased extraction of the diesel cut, improved quality of gas, gasoline fraction and residue of the fractionating column, reduced capital costs.

1 dwg, 2 tbl