Patent ID: 11946003
Assignee: CHINA PETROLEUM & CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. A method for producing needle coke using the system according to claim 1, comprising the steps of:
(1) reacting a heated hydrocarbon-containing feedstock in the coke tower to obtain the needle coke and the oil gas;
(2) separating the oil gas from the coke tower in the pressure stabilization tower to obtain the overhead light fraction and the bottom oil;
(3) sending the bottom oil from the pressure stabilization tower to the buffer tank, and withdrawing a first stream of bottom oil and a second stream of bottom oil from the buffer tank;
(4) returning the first stream of bottom oil from the buffer tank to the pressure stabilization tower after a temperature adjustment;
(5) sending the second stream of bottom oil from the buffer tank to the coking fractionation tower, separating the stream into the light oil and the heavy oil therein, and optionally returning the heavy oil to the coke tower for further reaction,
wherein the pressure at the top of the pressure stabilization tower is adjusted by the pressure controller at the top of the pressure stabilization tower, so that the pressure at the top of the coke tower is maintained at a set value.