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Shut-down method of coal tar hydrotreating process

A technology for hydroprocessing and coal tar, which is applied in the direction of start-up of hydroprocessing operations, etc.

Active Publication Date: 2007-12-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No plant shutdown technology is involved in this process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment is a method for shutting down the device after hydrotreating the light fraction of coal tar at <350°C by using a fixed bed. The specific operation process is: after the hydrogenation reaction of coal tar light fraction at <350°C is completed, the temperature is lowered to 240°C at a cooling rate of 10°C / hr, and the coked diesel oil at 300-350°C containing 5wt% butyl acetate is pumped into the reactor, and cleaned at a constant temperature of 240°C for 6 hours. After the cleaning, the conventional shutdown diesel pump was sent into the device at this temperature for cleaning, and at the same time, the temperature of the reactor was lowered to 150°C at 20°C / hr, and the temperature was lowered while cleaning , when the temperature drops to 150°C, stop the oil pump, and blow nitrogen into the device for 10 hours before ending. During the shutdown process, there was no blockage of pipelines and other components, the device shut down normally, the catalyst bed...

Embodiment 2

[0019] This embodiment is a method for shutting down the device after hydrotreating the whole fraction of coal tar by using a fixed bed. The specific operation process is as follows: after the coal tar hydrogenation reaction is completed, the reaction temperature is lowered to 350°C at a cooling rate of 15°C / hr, and the 350-500°C catalytic wax oil containing 6wt% fatty alcohol polyoxyethylene ether is pumped into the reaction The reactor was cleaned at a constant temperature for 6 hours, and then the reaction temperature was lowered to 300° C. at a rate of 15° C. / hr for 6 hours of constant temperature cleaning. Then pump the heavy diesel oil that is often shut down into the device cleaning device. After cleaning at a constant temperature of 300 ° C for 8 hours, the temperature of the reactor is lowered to 150 ° C at 20 ° C / hr. After the cleaning is completed, the oil pump is stopped, and nitrogen gas is blown into the device for purging After 15 hours, the nitrogen supply wa...

Embodiment 3

[0021] This embodiment is a method for shutting down the device after hydrotreating coal tar distillate oil at <500°C by using an ebullating bed. The specific operation process is: after the hydrogenation reaction of the coal tar distillate oil at <500°C is completed, the 350-400°C coking wax oil containing 10wt% alkylphenol polyoxyethylene ether is pumped into the reactor at the reaction temperature, and it is cleaned while cleaning. The reaction temperature is lowered to 280°C at a cooling rate of 20°C / hr, and then the conventional shut-down diesel pump is sent into the device for cleaning, while the temperature of the reactor is lowered to 150°C at a rate of 20°C / hr. The device was purged with nitrogen for 10 hours, then the nitrogen purging was stopped, the device was shut down normally, and the pipeline and reactor were cleaned.

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PUM

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Abstract

The present invention discloses shut-down method of coal tar hydrotreating process. After the coal tar hydrotreating reaction is finished, the shut-down oil containing polar matter is first pumped into the reaction system for cleaning the pipeline and the reactor, and conventional shut-down oil is then added into the apparatus. Compared with available technology, the present invention has the advantages of complete cleaning of the reaction apparatus and capacity of ensuring the fluent shut-down.

Description

technical field [0001] The invention relates to a shutdown method of a coal tar treatment process, in particular to a shutdown method for producing light fuel by using a hydrogenation treatment technology using coal tar as a raw material. Background technique [0002] Coal tar is a by-product of coal coking, carbonization and gasification. Coal tar is different from natural petroleum, with complex composition, high content of aromatics, colloids and asphaltenes, and impurities such as sulfur, nitrogen, oxygen and metals, among which the oxygen content is 2-9wt%, and the oxygen-containing substances are mainly complex impurities containing oxygen. Cyclic or aromatic derivatives. At present, most of coal tar is used as fuel, which has poor economy and serious environmental pollution. Due to the increasingly stringent requirements of environmental protection regulations and the increasing demand for light vehicle fuel oil, the technology of using hydrogenation technology to p...

Claims

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Application Information

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IPC IPC(8): C10G49/24
Inventor 贾丽葛海龙刘建锟杨涛贾永忠李鹤鸣
Owner CHINA PETROLEUM & CHEM CORP
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