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A kind of alkyne selective hydrogenation catalyst and its preparation method and application

A hydrogenation catalyst and selective technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of reducing catalyst activity, selectivity and stability, There are many side reactions, poor hydrogenation activity stability and other problems, so as to improve the hydrogenation selectivity and operation stability, the preparation method is simple and easy to operate, and the operation stability is excellent.

Active Publication Date: 2021-11-23
沈阳沈科姆科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Coking is another important cause of catalyst deactivation. The main reasons for coking are firstly poor catalyst selectivity, too many side reactions such as alkyne and diene polymerization, and secondly, too high reaction temperature or adiabatic temperature rise Too high, resulting in intensified polymerization of unsaturated hydrocarbons at high temperature
Once the colloid is formed, it will cover the active center or block the pores of the catalyst, thereby reducing the activity, selectivity and stability of the catalyst, and eventually causing the catalyst to be deactivated and unable to operate normally
[0016] In the prior art, catalysts with palladium as the active component are easily interfered by impurities such as water, solvents, and heavy components in the hydrogenation material, so the hydrogenation activity, especially the operation stability, is poor. In order to improve this situation, different A variety of additives to promote the dispersion of palladium and produce a synergistic effect with palladium to improve catalyst selectivity and stability
In the prior art, when the carrier is impregnated with the soluble salt of the auxiliary agent, due to the inhomogeneity of the pore structure of the carrier itself and the difficulty in achieving the consistency of the impregnation condition control, the auxiliary agent presents a non-uniform distribution in the catalyst, which is different from that of palladium. The synergistic effect is not fully exerted, which makes it difficult to achieve a balance between the hydrogenation activity, selectivity and stability of the catalyst

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  • A kind of alkyne selective hydrogenation catalyst and its preparation method and application
  • A kind of alkyne selective hydrogenation catalyst and its preparation method and application
  • A kind of alkyne selective hydrogenation catalyst and its preparation method and application

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Effect test

Embodiment 1-10

[0048] The alkyne selective hydrogenation catalyst carrier of embodiment 1~10 is Al 2 o 3 , each component is as shown in table 1, and its preparation process is:

[0049] A. Carrier preparation:

[0050] The preparation concentration is 200gAl 2 o 3 / L Sodium metaaluminate solution 1L, heated to 70°C, the prepared concentration is 80gAl 2 o 3 / L aluminum sulfate solution 2L, heated to 70°C;

[0051] Add 1.0L of distilled water to the gelling tank, heat it to 70°C, and add the above two slurries at the same time, keep the pH value at 8.0, and carry out gelling at a temperature of 70°C. During the gelling process, add Cu salt with a concentration of 0.05mol / L solution and / or Sn salt solution and / or Si salt solution;

[0052] After gel formation, aging at pH 8.0 and temperature 70°C for 60 minutes. After aging, inject deionized water at 65°C, beat, wash, and filter the aged slurry at a stirring rate of 200rpm, and dry the filter cake at 100°C for 3 hours to obtain a pseu...

Embodiment 11-20

[0058] The alkyne selective hydrogenation catalyst carrier of embodiment 11~20 is Al 2 o 3 , each component is as shown in table 1, and its preparation process is:

[0059] A. Carrier preparation:

[0060] Prepare the concentration of 200gAl in the gel tank 2 o 3 / L aluminum nitrate solution 1L, the preparation concentration is 80gAl 2 o 3 / L aluminum sulfate solution 1L, mix well and heat to 75°C;

[0061] Inject CO into the glue tank 2 Gas, maintain a pH value of 8.0 to 8.5, and perform gelation at a temperature of 75°C. After gelation, age at a pH value of 8.0 and a temperature of 70°C for 60 minutes;

[0062] After aging, inject deionized water at 75°C, beat at a stirring rate of 200rpm after washing, and add Cu salt solution and / or Sn salt solution and / or Si salt solution with a concentration of 0.05mol / L at the same time, beat for 60min and then filter. After the filter cake was dried at 120° C. for 8 hours, pseudo-boehmite containing Cu and / or Sn and / or Si was o...

Embodiment 21-30

[0068] Alkyne selective hydrogenation catalyst carrier of embodiment 21~30 is Al 2 o 3 , each component is as shown in table 1, and its preparation process is:

[0069] A. Carrier preparation:

[0070] The preparation concentration is 200gAl 2 o 3 / L aluminum nitrate solution 1L, the preparation concentration is 80gAl 2 o 3 / L aluminum sulfate solution 1L, mix the two solutions and heat to 50°C;

[0071] Prepare a mixed solution of sodium carbonate and ammonium bicarbonate in the gelling tank and heat it to 60°C, add the mixed solution of aluminum nitrate and aluminum sulfate into the gelling tank, keep the pH value at 8.0-8.5, and gel at a temperature of 60°C , adding a Cu salt solution and / or a Sn salt solution and / or a Si salt solution with a concentration of 0.05mol / L during the gelling process;

[0072] After gel formation, aging at pH 8.0 and temperature 60°C for 60 minutes. After aging, inject 75°C deionized water for washing, then beat at a stirring rate of 200...

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Abstract

The invention belongs to the technical field of petrochemical industry, and in particular relates to an alkyne hydrogenation selective catalyst and its preparation method and application. The catalyst is composed of an active component, a catalytic promoter and a carrier. The active component is palladium, and a catalytic promoter is added to improve the hydrogenation stability and selectivity of the catalyst. The catalytic promoter is introduced into the catalyst in different ways In this process, the acidity of the catalyst surface can be reasonably controlled and the dispersion of the active component palladium can be promoted to form more active sites. The catalyst of the present invention is suitable for the selective hydrogenation of alkyne-containing materials, especially for the selective hydrogenation of carbon four materials with high alkyne content discharged from a butadiene extraction device, to convert vinyl acetylene and ethyl acetylene into butadiene Diene and butene, hydrogenation products are returned to the raw material storage tank or butadiene extraction unit to recover butadiene and butene. The catalyst of the invention has mild hydrogenation reaction conditions, high activity and selectivity, especially good stability and long operation period, and is suitable for hydrogenation of materials with high alkyne content.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to an alkyne hydrogenation selective catalyst and its preparation method and application. Background technique [0002] Butadiene is an important petrochemical basic organic raw material and synthetic rubber monomer. It is one of the most important components in the C4 fraction, and its position in petrochemical olefin raw materials is second only to ethylene and propylene. The main source of butadiene is the mixed carbon four produced by the ethylene plant as raw material, which is separated by solvent extraction. The mixed carbon four fraction produced by ethylene plant usually contains 40wt%~60wt% butadiene, 0.5wt%~2.0wt% alkyne, mainly including methylacetylene (MA), ethylacetylene (EA) and vinyl Acetylene (VA), others butanes (n-butane and isobutane) and butenes (n-butene, isobutene, trans-butene-2 ​​and cis-butene-2). [0003] At present, acetonitr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/58B01J23/62B01J35/10C07C5/09C07C11/167C07C11/08
CPCB01J23/58B01J23/626B01J23/628B01J23/8946B01J23/8966B01J35/1014B01J35/1038B01J35/1042C07C5/09C07C11/167C07C11/08
Inventor 富伟杨钟声
Owner 沈阳沈科姆科技有限公司
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