Patent ID: 11932816
Assignee: EXXONMOBIL CHEMICAL PATENTS INC.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A furnace effluent upgrading process, comprising:
contacting the furnace effluent with a first quench liquid to produce a quenched mixture, wherein (i) at least a portion of the furnace effluent is produced by steam cracking a hydrocarbon feed in a radiant section of a steam cracking furnace under steam cracking conditions comprising a temperature ≥760° C. and a residence time of ≤5 seconds, (ii) the furnace effluent comprises coke and/or tar, and (iii) the first quench liquid comprises one or more of a first steam cracker naphtha, a first steam cracker gas oil, and a first steam cracker quench oil;
introducing the quenched mixture into a first inlet of a centrifugal separator;
separating a vapor product and a centrifugal separator bottoms from the quenched mixture, wherein the centrifugal separator bottoms comprises at least a portion of the coke and/or at least a portion of the tar; and
recovering the centrifugal separator bottoms from a first outlet of the centrifugal separator;
further comprising introducing a second quench liquid into a second inlet of the centrifugal separator, wherein the second quench liquid comprises one or more of a second steam cracker naphtha, a second steam cracker gas oil, and a second steam cracker quench oil; further comprising introducing a recycle portion of the centrifugal separator bottoms tangentially onto a frustoconical inner wall of the centrifugal separator through a recycle fluid inlet of the centrifugal separator; and controlling the mass flow rate of the second quench liquid to maintain a solids content of ≤0.9 wt. % in the centrifugal separator bottoms.