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Pre-passivation method for continuous reforming device

A reforming device and reforming reactor technology, applied in the direction of reforming operation start-up, etc., can solve the problems of unsuitable catalytic reforming process, irreversible poisoning, high environmental requirements, etc., and achieve the effect of suppressing catalytic coking

Active Publication Date: 2012-12-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Since platinum-tin series continuous reforming catalysts are extremely sensitive to impurities and have high environmental requirements, the various substances involved in the above methods will cause serious poisoning or irreversible poisoning of the reforming catalyst, so they are not suitable for catalytic reforming process

Method used

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example 1

[0031] On a continuous reforming device with no reforming catalyst loaded in a set of reactors, the method of the invention is used to pre-passivate the reaction system.

[0032] The continuous reforming reaction system is replaced with nitrogen with a purity of 99.8 mol% until the oxygen content of the exhaust gas is less than 0.5 mol%. Use nitrogen to pressurize the reforming high-pressure separator to 350KPa, start the reforming compressor cycle, and make the circulating gas flow rate 4×10 4 N m 3 / h, each reactor was heated at a rate of 20-40°C per hour. When the inlet temperature of each reactor rises to 170°C, start to inject hydrogen sulfide into the circulating nitrogen and continue to heat up, the injected hydrogen sulfide makes the sulfur content in the circulating gas 20~30×10 -6 L / L. When the reactor inlet temperature reached 450°C, the temperature was lowered after a constant temperature cycle for 3 hours, and the injection of hydrogen sulfide was stopped. Rep...

example 2

[0034] A reforming catalyst is loaded in the continuous reforming unit, and the catalyst contains 0.29% by mass of platinum, 0.31% by mass of tin, and the rest is γ-alumina.

[0035] First replace the continuous reforming unit with nitrogen with a purity of 99.8 mol% until the oxygen content of the exhaust gas is less than 0.5 mol%, and then replace the system with hydrogen with a purity of 96 mol% until the hydrogen content of the exhaust gas is greater than 90 mol%. Use hydrogen to pressurize the reforming high-pressure separator to 350KPa, start the reforming compressor cycle, and make the circulating gas volume 5×10 4 N m 3 / h. Raise the temperature of each reactor at a rate of 20-40 °C per hour until the inlet temperature of the reactor is 200 °C, start to inject dimethyl disulfide into the circulating gas and continue to heat up, inject dimethyl disulfide, and make the circulation The sulfur content in the gas is 3~5×10 -6 L / L. When the reactor inlet temperature rose...

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Abstract

The invention relates to a pre-passivation method for continuous reforming device, comprising the following steps: temperature of a reactor not yet loaded with catalyst or temperature of a reactor loaded with catalyst is raised to 100-650 DEG C and sulphide is injected to the air flossing in the system at the temperature; sulfur content in the air is controlled at 100 x 10<-6>L / L, so as to passivate a wall of the device; then, reaction raw material is inlet into the reactor in existence of catalyst to carry out reaction. The method can effectively restrain catalytic coking generated by the metal of high-temperature wall of the reforming reactor, thereby reducing operation risk of the device.

Description

technical field [0001] The invention relates to a pre-passivation method for a continuous regenerative catalytic reformer, in particular to a passivation method before the continuous reformer starts to react. Background technique [0002] The continuous regenerative catalytic reforming of naphtha is highly valued in the production of high-octane gasoline and aromatics due to its high liquid yield, high hydrogen yield and high aromatics yield. At present, the reforming catalyst used in the continuous reforming unit is a series of dual or multi-metal catalysts containing platinum and tin. Compared with catalysts containing only platinum, platinum-tin catalysts are more sensitive to sulfide. Therefore, to ensure the normal operation of the catalytic reforming unit, there must be strict restrictions on the sulfur content in the reforming feedstock. [0003] CN1234455C, US6495487B1 and US6780814B2 all disclose the service environment requirements of a platinum-tin multi-metal re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G35/22
Inventor 纪长青任坚强王杰广张新宽陈恒芳赵雅郡
Owner CHINA PETROLEUM & CHEM CORP
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