Aromatic hydrocarbon olefin removal catalyst, preparation method and application thereof

A catalyst and de-olefin technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low overall life and poor regeneration stability, and achieve excessive damage prevention, good regeneration stability, and simplified The effect of preconditioning

Active Publication Date: 2021-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problem of poor regeneration stability of previous Y molecular sieve deolefin catalysts, resulting in low overall service life, and provides a novel deolefin catalyst with moderate surface acidity, suitable acid distribution and high reaction stability. At the same time, ZSM-5 molecular sieve is used The characteristics of good structural stability under regeneration conditions, and the characteristics of good regeneration stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Dissolve 10 g of glucose in 60 mL of distilled water, add 10 g of Y molecular sieve to disperse evenly, transfer it to a 100 mL stainless steel reactor, put it in a constant temperature oven at 180 °C for 6 hours, filter, dry, and repeat the above operation 3 times to obtain a carbon-modified product. Y molecular sieve. At room temperature, according to the ratio of the amount of substances nNaCl: nNa 2 O:nSiO 2 : nAl 2 O 3 : nTPABr: nH 2 SO 4 : nH 2 O=8:5.8:98:1:6:3.2:700 to formulate the gel. Add the above carbon-modified Y molecular sieve, stir evenly, put it into a 75°C constant temperature oven and dry it to obtain a dry glue.

[0060] Take 12 mL of 20% ethylenediamine solution and place it at the bottom of a 100 mL stainless steel reaction kettle, and place the dry glue above the liquid to crystallize at 180 ° C for 3d. After washing, filtration, drying, and roasting, Na-Y / ZSM-5 is obtained. Molecular sieve, wherein the content of Y molecular sieve is 50%,...

Embodiment 2

[0065] The synthesis method of Na-Y / ZSM-5 is the same as that in Example 1, except that the gel ratio is changed to nNaCl: nNa 2 O:nSiO 2 : nAl 2 O 3 : nTPABr: nH 2 SO 4 : nH 2 O=15:6.2:65:1:5.2:4.1:1000, and the dry glue was crystallized at 180°C for 2d. The Y molecular sieve content of the obtained Na-Y / ZSM-5 molecular sieve is 75%, and the ZSM-5 content is 25%.

[0066] After drying at 120℃, take 10g of this molecular sieve, immerse it in 20g of silica sol with a mass fraction of 30% at room temperature for 3 hours, dry at 120℃, and pulverize. Treat in steam for 1 hour, exchange citric acid and glycerol solution at 90°C (the concentration of citric acid is 10%, and the concentration of glycerol is 3%) for 3 hours, then dry at 120°C, pulverize, add water, alumina Y / ZSM-5 symbiotic molecular sieve catalyst was obtained by coagulating agent, asparagus powder extruding, drying at 80°C, and calcining at 550°C. 3 According to the TPD results, the ratio of the weak acid am...

Embodiment 3

[0070] The synthesis method of Na-Y / ZSM-5 is the same as that in Example 1, except that the gel ratio is changed to nNaCl: nNa 2 O:nSiO 2 : nAl 2 O 3 : nTPABr: nH 2 SO 4 : nH 2 O=20:7.6:40:1:4.3:4.8:881, and the dried gum was crystallized at 180°C for 2d. The Y molecular sieve content of the obtained Na-Y / ZSM-5 molecular sieve is 90%, and the ZSM-5 content is 10%.

[0071] After drying at 120℃, take 10g of this molecular sieve, soak it in 40g of silica sol with a mass fraction of 15% at room temperature for 3 hours, dry at 120℃, and pulverize. Treated in steam for 1 hour, 90 ° C sulfuric acid, polyethylene glycol 400 solution (wherein the concentration of sulfuric acid is 2%, the concentration of polyethylene glycol 400 is 8%) exchanged for 3 hours, dried at 120 ° C, pulverized, added water, oxidized Y / ZSM-5 symbiotic molecular sieve catalyst was obtained by extruding aluminum binder, assine powder, drying at 80°C, and calcining at 550°C. 3 According to the TPD results...

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Abstract

The invention provides an aromatic hydrocarbon olefin removal catalyst, a preparation method and application thereof, wherein the main components of the aromatic hydrocarbon olefin removal catalyst comprise a Y / ZSM-5 symbiotic molecular sieve, and the ratio of the amount of weak acid to the amount of medium strong acid in the catalyst is 1:3-3:1. During preparation, the Y / ZSM-5 symbiotic molecular sieve is soaked in silica sol, then molding roasting treatment is carried out, and exchange treatment is carried out in an acid / alcohol mixed solution before molding. The preparation method is simple and easy to implement. The olefin removal catalyst has the characteristics of moderate surface acidity, proper acidity distribution, high reaction stability and good regeneration stability by utilizing the characteristic of good structural stability of the ZSM-5 molecular sieve under the regeneration condition.

Description

technical field [0001] The invention relates to the technical field of catalytic deolefination, in particular to a catalyst for deolefination of aromatic hydrocarbons and a preparation method and application thereof. Background technique [0002] Aromatic hydrocarbons are the basic raw materials of petrochemical industry, which mainly come from aromatic hydrocarbon complexes. All aromatic products after catalytic reforming contain a certain amount of olefin impurities. Olefins are active in nature, not only easy to polymerize to form gums, but also may react with other components to generate non-ideal components, which have a great impact on the quality of aromatic products. [0003] On the other hand, some petrochemical processes such as xylene adsorption and separation process are particularly sensitive to olefins, even if the content of olefin impurities is only a few parts per million, it will have a very adverse effect on the process. In order to obtain qualified chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J35/10C07C7/00C07C15/08
CPCY02P20/52Y02P20/584
Inventor 周亚新郑均林孔德金李为吴历斌
Owner CHINA PETROLEUM & CHEM CORP
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