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Method for starting operation of catalyst for hydrocracking in oxidation state

A hydrocracking and catalyst technology, which can be used in the start-up of hydrotreating operations, etc., can solve the problems of toxic and harmful substances, prolonging the start-up time of the unit, and long vulcanization process.

Inactive Publication Date: 2007-07-25
XIAMEN UNIV
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  • Abstract
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Problems solved by technology

[0003] However, there are always a series of disadvantages in the pre-vulcanization process: 1. Special pre-vulcanization equipment and instruments are required; 2. The vulcanization process is long, which prolongs the start-up time of the device; 3. The vulcanizing agent and its reaction product H2S are poisonous and harmful substance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put the hydrocracking catalyst containing heteropolyacids with silica as the carrier into the reaction tube, feed nitrogen, and the volume space velocity is 2000h -1 , lasted for 6 hours, the pressure of the reaction system was gradually increased to 2.0MPa, after checking that there was no air leakage, hydrogen gas was introduced, and after the nitrogen gas was turned off for 2 hours, the temperature of the reaction system was raised to 300°C with a heating rate of 2°C·min -1 , kept for 1h, at a stable hydrogen volumetric space velocity of 2000h -1 Cut down into n-decane with a volume space velocity of 2.5h-1. Samples were collected after 4 hours of reaction to test the hydrocracking activity and selectivity of the catalyst under reaction conditions. The hydrocracking activity is expressed by the conversion rate of n-decane, and the selectivity is expressed by "the number of moles of alkanes containing 5 carbon atoms or more in the product divided by the total moles of...

Embodiment 2

[0019] In Example 1, the reaction hydrocarbon raw material is changed into n-dodecane solution, which is the cost example. The hydrocracking activity is expressed by the conversion rate of n-dodecane, and the selectivity is expressed by "the number of moles of alkanes containing 6 carbon atoms and more than 6 carbon atoms in the product divided by the total number of moles of the product", which is recorded as C6+ selectivity . This is because, in the hydrocracking process, it is desirable to have more primary cracking products and less secondary cracking products. When n-dodecane is used as the reaction hydrocarbon raw material, the product contains alkane with 6 carbon atoms and more than 6 carbon atoms. Both are primary cleavage products, so C6+ selectivity characterizes the relative amount of primary cleavage products in the product. The hydrocracking activity and selectivity of the catalysts under the reaction conditions are shown in Table 1.

Embodiment 3

[0021] In Example 1, the reaction hydrocarbon raw material was changed to a mixed solution of n-dodecane and n-decane with a mass ratio of 1:1, namely the cost example. The hydrocracking activity is expressed by the conversion rate of the mixed liquid, and the selectivity is expressed by "the number of moles of alkanes containing 5 carbon atoms or more in the product divided by the total number of moles of the product", which is recorded as C5+ selectivity. The hydrocracking activity and selectivity of the catalysts under the reaction conditions are shown in Table 1.

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PUM

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Abstract

This invention relates to a start-up method for oxidation-state hydrocracking catalyst used in oil refinery process. The method comprises: loading the oxidation-state hydrocracking catalyst into a reactor, introducing nitrogen to replace air in the reactor and pipelines, pressurizing to meet the pressure requirement of hydrocracking, switching to hydrogen after nitrogen flow is stable, raising the temperature of the catalyst bed to meet the temperature requirement of catalyst reduction after hydrogen flow is stable, keeping the temperature, adjusting the temperature of the catalyst bed to meet the temperature requirement of hydrocracking, adjusting hydrogen flux to meet the flux requirement of hydrocracking, and introducing hydrocarbon reactants. The method does not need pre-sulfurization of the catalyst with additional sulfurization agent, thus can avoid the problems caused by pre-sulfurization, and partially reduced catalyst has higher hydrocracking activity.

Description

technical field [0001] The invention relates to a catalyst, in particular to a hydrocracking catalyst in an oxidation state in an oil refining process. Background technique [0002] In the oil refining industry, hydrocracking is an important process for producing high-quality light oil products from heavy oil, and the core of its technology is the catalyst used. The hydrocracking catalyst is a dual-function catalyst, which has both acidic function and hydrogenation function. In the current oil refining process, hydrocracking catalysts are generally presulfided before use, that is, forced sulfidation, so that the active components of the catalyst are in a sulfided state. The catalyst in this state will not be poisoned by the sulfur in the reaction raw materials. And it has a certain performance of cracking hydrogen molecules. In industrial devices and laboratories, there are two main methods of sulfidation of hydrogenation catalysts: one is the dry method, that is, injectin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G49/24
Inventor 方维平邱波伊晓东林凌王跃敏万惠霖
Owner XIAMEN UNIV
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