Deolefination catalyst, preparation method and application thereof

A catalyst and de-olefin technology, which is applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor regeneration stability and low overall life, prevent excessive damage, simplify pretreatment conditions, and improve skeleton The effect of stability

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

[0010] 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 new type of deolefin catalyst, in which the amount of L acid and B acid has a suitable range, and the reaction stability is high. At the same time, the characteristics of good structural stability under the regeneration conditions of ZSM-5 molecular sieves are used to obtain the characteristics of good regeneration stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Dissolve 10g of glucose in 60mL of distilled water, add 10g of Y molecular sieve to disperse evenly, transfer it to a 100mL stainless steel reaction kettle, put it in a constant temperature oven at 180°C for 6 hours, filter and dry, and repeat the above operation 3 times to obtain carbon-modified 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=15:6.2:65:1:5.2:4.1:1000 to prepare the gel. Add the above-mentioned carbon-modified Y molecular sieve, stir evenly, and put it in a constant temperature oven at 75°C to dry to obtain dry glue.

[0056] Take 10mL of 15% ethylenediamine solution and place it at the bottom of a 100mL stainless steel reaction kettle, place the dried glue above the liquid and crystallize it at 180°C for 2 days, wash, filter, dry and roast to obtain Na-Y / ZSM-5 Molecular sieves, wherein the content of Y molecular sieve is 75%, and the content of...

Embodiment 2

[0061] Dissolve 10g of glucose in 60mL of distilled water, add 10g of Y molecular sieve to disperse evenly, transfer it to a 100mL stainless steel reaction kettle, put it in a constant temperature oven at 180°C for 6 hours, filter and dry, and repeat the above operation 3 times to obtain carbon-modified 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 prepare the gel. Add the above-mentioned carbon-modified Y molecular sieve, stir evenly, and put it in a constant temperature oven at 75°C to dry to obtain dry glue.

[0062] Take 12mL of 20% ethylenediamine solution and place it at the bottom of a 100mL stainless steel reaction kettle, place the dry glue above the liquid and crystallize it at 180°C for 3 days. After washing, filtering, drying and roasting, Na-Y / ZSM-5 is obtained Molecular sieves, wherein the content of Y molecular sieve is 50%, and...

Embodiment 3

[0067] The synthetic method of Na-Y / ZSM-5 is the same as in Example 1, only 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 dry glue was crystallized at 180°C for 2d. The obtained Na-Y / ZSM-5 molecular sieve has a Y molecular sieve content of 90% and a ZSM-5 content of 10%.

[0068] Take 10g of this molecular sieve after drying at 120°C, impregnate 40g of silica sol with a mass fraction of 15% at room temperature for 3 hours, dry at 120°C, and crush. Treat in steam for 1 hour, exchange hydrochloric acid solution (4wt%) at 90°C for 3 hours, then dry at 120°C, pulverize, add water, alumina binder, and squash powder to extrude, dry at 80°C, and roast at 550°C to obtain Y / ZSM-5 symbiotic molecular sieve catalyst, according to the desorption results of pyridine infrared at 200°C, the ratio of the amount of L acid to the amount of B acid in the catalyst is 0.73.

[0069] The Y / ZSM-5 catalyst was crushed,...

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PUM

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Abstract

The invention provides a deolefination catalyst, a preparation method and application thereof, wherein the main components of the deolefination catalyst comprise a Y / ZSM-5 symbiotic molecular sieve, and the ratio of the L acid amount to the B acid amount of the catalyst is (0.5-5):1 according to a pyridine infrared 200 DEG C desorption result. During preparation, the Y / ZSM-5 symbiotic molecular sieve is impregnated in silica sol, and the preparation method is simple and easy to implement. The olefin removal catalyst has the characteristics of reasonable pore distribution, moderate surface acidity, proper acidity distribution, high reaction stability, and good regeneration stability by utilizing the characteristic that the ZSM-5 molecular sieve has good structural stability under the regeneration condition.

Description

technical field [0001] The invention relates to the technical field of catalytic de-olefins, in particular to a catalyst for de-olefins and its preparation method and application. Background technique [0002] Aromatics are the basic raw materials of the petrochemical industry, which mainly come from aromatics complexes. The aromatic products after catalytic reforming reaction all contain a certain amount of olefin impurities. Olefins are active, not only easy to polymerize to form colloids, but also may react with other components to form non-ideal components, which will have a great impact on the quality of aromatic products. On the other hand, certain petrochemical processes such as xylene adsorption separation 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 chemical raw materials and ensure the smooth progress of subsequent pr...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J37/02B01J37/10B01J37/30C10G11/05
CPCY02P30/20
Inventor 周亚新孔德金郑均林李为王月梅
Owner CHINA PETROLEUM & CHEM CORP
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