Regeneration method of catalytic diesel hydrocracking catalyst

A technology for hydrocracking and catalytic diesel, applied in catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the reaction conversion rate, product distribution and product quality problems such as decline, impact on enterprise efficiency, and substandard gasoline product quality, to achieve the effect of shortening the initial stability time, improving the vulcanization effect, and shortening the start-up time

CN106669862BActive Publication Date: 2019-03-19CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-03-19

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Abstract

The invention discloses a method for regenerating a diesel hydrocracking catalyst. The method comprises (1) roasting a deactivated hydrocracking catalyst obtained by a diesel catalytic hydrogenation conversion technology in an oxygen-containing atmosphere until a decarburization rate of 40 to 80% so that a decarbonization catalyst is obtained, and (2) transferring the decarburization catalyst obtained in the step (1) into a high-pressure regeneration reactor and treating the catalyst at a high temperature in a hydrogen atmosphere containing hydrogen sulfide to obtain a regenerated hydrocracking catalyst. The catalyst regenerated by the method is used in the diesel catalytic hydrogenation conversion process so that the initial activity stabilization time of the catalyst is shortened, working time is shortened, a deactivation rate of the catalyst is reduced and the catalyst operation cycle is prolonged. In the regeneration process, the re-vulcanization of the catalyst is realized, the regeneration cycle of the device is greatly shortened and the vulcanization effect is significantly improved compared with the conventional vulcanization process.
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Description

technical field

[0001] The invention relates to a regeneration method of a catalyst, in particular to a regeneration method of a catalytic diesel hydrocracking catalyst. Background technique

[0002] In recent years, with the increasingly heavy quality of crude oil processed in China, the raw materials processed by catalytic cracking are also becoming heavier and inferior. In addition, many companies have carried out the optimization of catalytic cracking units in order to improve the quality of gasoline or increase the production of propylene. The modification or improvement of the operating severity of the catalytic cracking unit resulted in deterioration of the quality of catalytic cracking products, especially catalytic diesel.

[0003] In order to improve the utilization rate of petroleum resources, improve the overall quality level of gasoline and diesel fuel, realize the goal of product blending optimization and product value maximization, and meet the growing demand ...

Examples

Embodiment 1

[0026] (1) Take the hydrocracking active agent 1 after the operation of an industrial device for catalytic diesel hydroconversion and put it in the regeneration furnace;

[0027] (2) Introduce an oxygen / nitrogen mixed gas with an oxygen content of 1% into the regeneration furnace, and control the gas / agent ratio of 4000:1. At the same time, raise the temperature to 370°C at a heating rate of 25°C / h, and roast at a constant temperature for 4h;

[0028] (3) Transfer the sample obtained in step (2) to a high-pressure regeneration autoclave;

[0029] (4) Introduce H into the autoclave 2 The gas is replaced, and the gas / agent ratio is controlled to be 2000:1;

[0030] (5)H 2 After replacement to an oxygen concentration of less than 0.05%, H 2 Boost the pressure to 6.0MPa, then introduce H into the autoclave 2 S gas to H 2 After the S concentration was 0.8v%, the temperature was raised to 550°C at a heating rate of 40°C / h, and treated at a constant temperature for 6 hours to ob...

Embodiment 2

[0032] (1) Take the hydrocracking catalyst standby agent 2 after the operation of a catalytic diesel hydroconversion industrial unit and place it in the regeneration furnace;

[0033] (2) Introduce an oxygen / nitrogen mixed gas with an oxygen content of 3% into the regeneration furnace, control the gas / agent ratio of 1500:1, and at the same time, raise the temperature to 350°C at a heating rate of 25°C / h, and roast at a constant temperature for 8h;

[0034] (3) Transfer the sample obtained in step (2) to a high-pressure regeneration autoclave;

[0035] (4) Introduce H into the autoclave 2 The gas is replaced, and the gas / agent ratio is controlled to be 3000:1;

[0036] (5)H 2 After replacement to an oxygen concentration of less than 0.05%, H 2 Boost the pressure to 8.0MPa, then introduce H into the autoclave 2 S gas to H 2 After the S concentration was 1.0v%, the temperature was raised to 600°C at a heating rate of 40°C / h, and treated at a constant temperature for 4 hours ...

Embodiment 3

[0038] (1) Take the hydrocracking catalyst standby agent 3 after the operation of an industrial device for catalytic diesel hydroconversion and place it in the regeneration furnace;

[0039] (2) Introduce oxygen / CO with an oxygen content of 3% into the regeneration furnace 2 Gas mixed gas, control the gas / agent ratio of 1500:1, at the same time, raise the temperature to 300°C at a heating rate of 25°C / h, and roast at a constant temperature for 15h;

[0040] (3) Transfer the sample obtained in step (2) to a high-pressure regeneration autoclave;

[0041] (4) Introduce H into the autoclave 2 The gas is replaced, and the gas / agent ratio is controlled to be 2000:1;

[0042] (5)H 2 After replacement to an oxygen concentration of less than 0.05%, H 2 Boost the pressure to 6.0MPa, then introduce H into the autoclave 2 S gas to H 2 After the S concentration was 1.0v%, the temperature was raised to 650°C at a heating rate of 40°C / h, and treated at a constant temperature for 4 hour...