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

Claim 13:
14. A process for removing coke, tar, or a mixture thereof from a furnace effluent comprising:
contacting a furnace effluent comprising coke and/or tar, with a first quench liquid to produce a partially-quenched mixture, wherein 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 partially-quenched mixture into a first inlet of a centrifugal separator;
combining the partially quenched mixture in the centrifugal separator and a second quench liquid to produce a quenched mixture, the second quench liquid being introduced into a second inlet of the centrifugal separator at a second quench liquid mass flow rate, 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;
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;
recovering the centrifugal separator bottoms from a first outlet of the centrifugal separator;
recycling at least a portion of the centrifugal separator bottoms tangentially onto a frustoconical inner wall of the centrifugal separator through a recycle inlet of the centrifugal separator;
measuring a centrifugal separator bottoms mass flow rate at a location between the first outlet and the recycle inlet; and
increasing the flow rate of the second quench liquid when the centrifugal separator bottoms mass flow rate is ≤90% of a maximum recycle rate of the centrifugal separator bottoms.