Catalyst for producing low-carbon olefins through catalytic cracking by fixed bed

A catalytic cracking and catalyst technology, applied in physical/chemical process catalysts, hydrocarbon cracking to hydrocarbon production, molecular sieve catalysts, etc., can solve the problems of catalyst deactivation, easy carbon deposition, etc., and achieve the effect of improving weight yield

Active Publication Date: 2010-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the acid content of the molecular sieve is still relatively large at this time, and some molecular sieves have relatively strong acidity, even if the reaction is performed at 650°C, the activity is still high during the reaction process, and it is easy to deposit carbon, which leads to rapid deactivation of the catalyst.

Method used

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  • Catalyst for producing low-carbon olefins through catalytic cracking by fixed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Catalyst preparation: 30g of HSZM-5 molecular sieve (mole ratio of silicon to aluminum = 360) was uniformly mixed with 10g of alumina, kneaded, and extruded to shape. Dry at 100°C for 10 hours, and bake at 560°C for 4 hours. The molded product was immersed in an aqueous solution containing diammonium hydrogen phosphate, cobalt nitrate, and magnesium nitrate for 2 hours, filtered, dried, and calcined for 4 hours at a temperature higher than the decomposition temperature of the above-mentioned salts. Based on the weight percentage of the catalyst, the finally obtained catalyst contains 70.73% molecular sieve, 25.00% binder, 3.94% magnesium oxide, 0.10% cobalt oxide and 0.23% phosphorus oxide.

[0037] The prepared catalysts were evaluated in a small tubular fixed bed reactor. The evaluation condition is: the weight space velocity of naphtha is 1h -1 , the reaction temperature is 650° C., the pressure is normal pressure, and the water-to-oil feed weight ratio is 1. The r...

Embodiment 2

[0039] Catalyst preparation: catalyst shaping is the same as embodiment 1. Immerse the molded product in an aqueous solution containing diammonium hydrogen phosphate, cobalt nitrate, magnesium nitrate and calcium nitrate for 2 hours, filter, dry, and bake at a temperature higher than the decomposition temperature of the above salt for 4 hours. Based on the weight percent content of the catalyst, the finally obtained catalyst contains 73.41% molecular sieve, 22.30% binder, 1.57% magnesium oxide, 2.37% calcium oxide, 0.10% cobalt oxide and 0.25% phosphorus oxide .

[0040] Catalyst evaluation conditions are the same as in Example 1. The reaction results are shown in Table 1.

Embodiment 3

[0042] Catalyst preparation: catalyst molding method is the same as embodiment 1. Immerse the molded product in an aqueous solution containing diammonium hydrogen phosphate, cobalt nitrate, magnesium nitrate and calcium nitrate for 2 hours, filter, dry, and bake at a temperature higher than the decomposition temperature of the above salt for 4 hours. Based on the weight percent content of the catalyst, the finally obtained catalyst contains 73.41% molecular sieve, 22.45% binder, 1.52% magnesium oxide, 2.35% calcium oxide, 0.05% cobalt oxide and 0.22% phosphorus oxide .

[0043] Catalyst evaluation conditions are the same as in Example 1. The reaction results are shown in Table 1.

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Abstract

The invention discloses a molecular sieve-containing catalyst for producing low-carbon olefins through catalytic cracking by a fixed bed. To solve the problem that the prior catalyst has high acid content and is easy to coke, the catalyst provided by the invention contains a molecular sieve with the aperture between 5 and 6.5, a modified component thereof and an adhesive. The modified component contains alkaline earth metal oxides, phosphorous oxides and group VIII metal oxides. When the catalyst is used for catalytic cracking, under the condition that a temperature is 200 DEG or more lower than the conventional pyrolysis temperature, compared with the pyrolysis process, the total weight yield of ethylene and propylene is improved, the yield of methane is reduced by about 6 percent, and the ratio of the propylene to the ethylene is improved by more than 1 time.

Description

technical field [0001] The invention relates to a catalyst for preparing low-carbon olefins, more specifically, the invention relates to a catalyst for catalytic cracking of petroleum hydrocarbons in a fixed-bed reactor to prepare low-carbon olefins. Background technique [0002] At present, ethylene in the world is mainly produced with naphtha or low-carbon alkanes as raw materials, using tube furnace steam pyrolysis technology. Although the steam pyrolysis of hydrocarbons to ethylene technology has been perfected after decades of development, the reaction temperature is very high because steam cracking uses heat to activate hydrocarbons. Generally, when gaseous hydrocarbons are used as raw materials, the cracking temperature is 840-870°C; when liquid hydrocarbons are used as raw materials, the cracking temperature is 780-840°C. Therefore, the limiting factors in the production of ethylene by tube furnace steam thermal cracking technology are: (1) high energy consumption; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/42B01J29/40C07C11/04C07C4/06
CPCY02P20/52
Inventor 吉媛媛陈硕郭敬杭张永刚巴海鹏司宇辰
Owner CHINA PETROLEUM & CHEM CORP
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