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A kind of nickel-based selective hydrogenation catalyst initial activation hydrothermal passivation method

A hydrogenation catalyst and selective technology, which can be used in catalyst activation/preparation, selective hydrorefining, chemical instruments and methods, etc., can solve the problems of long start-up period and impact on stable performance, and achieve a shortened start-up period. Effect

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of this passivation method is to cover part of the active sites with carbon deposits on the surface of the catalyst, which can well meet the requirements of the initial activity passivation of the catalyst. Use stability performance is affected

Method used

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  • A kind of nickel-based selective hydrogenation catalyst initial activation hydrothermal passivation method
  • A kind of nickel-based selective hydrogenation catalyst initial activation hydrothermal passivation method
  • A kind of nickel-based selective hydrogenation catalyst initial activation hydrothermal passivation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Raw materials: Lanzhou Petrochemical C 6 -C 7 Distillation pyrolysis gasoline is used as a raw material, and the properties of the raw material are shown in Table 1:

[0022] Table 1 Raw material properties

[0023]

[0024] Catalyst reduction treatment

[0025] On a 100ml fixed-bed reactor, the catalyst loading amount is 100ml (mass 76g), and the catalyst reduction process is completed according to the following process conditions.

[0026] (1) Reduction pressure 0.5MPa;

[0027] (2) The amount of reduced hydrogen is 800 times the volume of the catalyst;

[0028] (3) Reduction process: raise the bed temperature to 150°C at a heating rate of 50°C / h and keep the temperature constant for 4 hours; raise the bed temperature to 250°C at a heating rate of 30°C / h and keep the temperature constant for 8 hours; Raise the bed temperature to 370°C at a heating rate of 30°C / h, and keep the temperature constant for 8 hours; raise the bed temperature to 430°C at a heating rate ...

Embodiment 2

[0044] The catalyst reduction process was carried out according to Example 1. The restoration conditions are as follows:

[0045] 1) Reducing pressure. 3.5MPa;

[0046] 2) The amount of hydrogen to be reduced is 550 times the volume of the catalyst;

[0047] 3) Reduction process: raise the bed temperature to 130°C at a heating rate of 20°C / h, and keep the temperature constant for 6 hours;

[0048] Raise the bed temperature to 230°C at a heating rate of 40°C / h and keep the temperature constant for 5 hours; raise the bed temperature to 350°C at a heating rate of 20°C / h and keep the temperature constant for 5 hours; Raise the bed temperature to 460°C, keep the temperature constant for 5 hours, and lower the bed temperature below 40°C to complete the reduction.

[0049] After the reduced catalyst is discharged from the reactor, the initial activity of the catalyst is deactivated in the moving bed, the temperature of the bed is raised to 380°C, and the water vapor temperature is...

Embodiment 3

[0058] The catalyst reduction process and process conditions were carried out according to Example 1.

[0059] The passivation treatment conditions are as follows:

[0060] (1) The steam treatment temperature is 470°C;

[0061] (2) The steam treatment time is 1 hour;

[0062] (3) The water vapor consumption per hour is 152g / h.

[0063] Table 4 catalyst passivation effect

[0064]

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Abstract

The invention relates to a hydrothermal passivation method for the initial activation of a nickel-based selective hydrogenation catalyst, which mainly includes two processes: (1) the reduction process of the catalyst, and the nickel element in the reduced catalyst exists in the form of simple nickel; (2) ) catalyst hydrothermal passivation treatment process after reduction, the catalyst is loaded in the reactor bed, and water vapor at a certain temperature is introduced into the catalyst bed to make the water vapor and the catalyst fully contact, and the catalyst hydrothermal passivation treatment process is completed. The method has the characteristics of simple operation, environmental friendliness, and short start-up period. In addition, the initial activity passivation of the catalyst is carried out by using the passivation method, which has little influence on the use stability of the catalyst.

Description

technical field [0001] The invention relates to a hydrothermal passivation method for the initial activity of a nickel-based catalyst, which is particularly suitable for the initial-activation passivation of a nickel-based selective hydrogenation dediene catalyst. Background technique [0002] At present, the catalysts used for the selective hydrogenation of diolefins are mainly divided into two series: noble metal Pd-based catalysts and non-noble metal Ni-based catalysts. The noble metal Pd-based catalyst has the advantages of good hydrogenation activity and high selectivity, but its resistance to impurities is poor; the non-noble metal Ni-based catalyst has relatively poor selectivity, but it has better resistance to impurities. Pyrolysis gasoline is a by-product distillate in the ethylene production process, which can be used to produce aromatics extraction raw materials after hydrotreating. In the 1990s, domestic hydrogenation catalysts used in the first stage of pyroly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/10C10G45/36
Inventor 王廷海梁顺琴李自夏曾令志常晓昕马好文王宗宝瞿朝霞林宏
Owner PETROCHINA CO LTD
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