METHOD FOR FRACTIONATING OF THERMAL CRACKING PRODUCTS Russian patent published in 2015 - IPC C10G9/00 C10G7/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to method for fractionating of thermal cracking products that includes delivery to the complex rectification tower of primary raw material and product from the thermal cracking reactor, which is produced from secondary raw material outputted from dead tray of the complex tower and then directed to the furnace and then to the thermal cracking reactor with stripping of wet gas, unstable gasoline, thermal gas oil and cracked residue, differentiated by the fact that rectification is carried out in one complex rectification tower with stripping section (24). The primary raw material is delivered by two flows: the first flow is introduced to the area of the secondary raw material outputting from the dead tray placed upstream input of the product after reactor while the second flow is introduced upstream input of the first flow, at that below the spot of the first side stream discharge of thermal gas oil from the tower the second side stream is outputted, cooled and mixed partially with the product after reactor and returned to the tower partially. Upon cooling (38) the remaining quantity is delivered to the absorber top, wet gas is delivered to the absorber bottom while dry gas is outputted from its top and liquid from the bottom is returned to the complex tower to the cross-section between outputs of side streams as circulating reflux; unstable gasoline is heated up in the heat exchanger by vapours from the top of the complex tower and delivered to the top of the stripping section (8), vapours from the top of the stripping section (8) are delivered for mixing with vapours outputted from the top of the complex tower and liquid is outputted from the bottom of the stripping section (8); the above liquid is heated and evaporated in a boiler, vapours from the boiler top are returned to the bottom of the striping section (8) and unstable gasoline is outputted from the boiler bottom.

EFFECT: reduced energy costs, increased selection and improved quality of light stripped products, simplified scheme for discharge of thermal cracking products and reduced potential thermal decomposition of stripped products in towers with coke formation.

1 dwg, 1 tbl