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Method for producing light steam cracking raw materials by catalytic cracking

A raw material, lightweight technology, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of poor ethane and propane selectivity, low cracking activity, etc., and achieve the improvement of hydrocracking activity. Selective, clogging-relieving effect

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of low cracking activity and poor selectivity between ethane and propane when the existing catalyst is used in the process of producing light steam cracking raw materials by hydrocracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 181.8 grams of white carbon black (99%SiO 2 ), 62.6 grams of aluminum nitrate, 58.1 grams of sodium hydroxide, 31.5 grams of turnip powder and 218 grams of water were mixed evenly, extruded into strips, and dried at 250°C for 24 hours to obtain the crystallized precursor WS1.

[0020] Weigh 20 grams of ethylenediamine and 50 grams of water to the bottom of the reaction kettle, weigh 100 grams of the crystallization precursor and place it on a polytetrafluoroethylene open-hole bracket isolated from water and template agent, and crystallize at 120 ° C 120 hours. The crystallized product was washed three times with deionized water, dried at 140°C for 2 hours, and calcined at 500°C for 12 hours to obtain the unbonded carrier NWS1 (SiO 2 with Al 2 o 3 The molar ratio is 20).

[0021] Under the conditions of 80°C, solid-to-liquid ratio of 1:10, and 1 mole of ammonium nitrate solution, NWS1 is exchanged three times with ammonia ion, then dried at 100-140°C for 2-24 h...

Embodiment 2

[0026] Weigh 450 grams of silica sol (40% SiO 2 ), 29.0 grams of aluminum chloride, 32.4 grams of sodium hydroxide, 15 grams of polyethylene glycol (molecular weight 8000) and 20 grams of ZSM-5 seed (SiO 2 with Al 2 o 3 The molar ratio is 50), mixed evenly, extruded into rods, and dried at 80°C for 2 hours to obtain the crystallized precursor WS2.

[0027] 100 g of the crystallization precursor was weighed and placed on a polytetrafluoroethylene perforated bracket, and crystallized at 120° C. for 180 hours. The crystallized product was washed three times with deionized water, dried at 140°C for 2 hours, and calcined at 500°C for 12 hours to obtain an unbonded carrier NWS2 (SiO 2 with Al 2 o 3 The molar ratio is 50).

[0028]Under the conditions of 80°C, solid-to-liquid ratio of 1:10, and 1 mole of ammonium nitrate solution, NWS1 was subjected to ammonia ion exchange three times, then dried at 100°C for 12 hours, and calcined at 550°C for 12 hours to obtain the hydrogen-f...

Embodiment 3

[0032] Weigh 60 grams of silica sol (40% SiO 2 ), 2.67 grams of aluminum sulfate, 6.4 grams of sodium hydroxide, 12 grams of polyvinyl alcohol (molecular weight 8000) and 180 grams of ZSM-5 seed (SiO 2 / Al 2 o 3 The molar ratio is 100) and 150 g of water were mixed uniformly, extruded and formed, and dried at 80°C for 2 hours to obtain the crystallized precursor WS3.

[0033] Weigh 20 grams of triethylamine and 40 grams of water to the bottom of the reaction kettle, weigh 100 grams of the crystallization precursor and place it on a polytetrafluoroethylene open-hole bracket, and crystallize at 120° C. for 180 hours. The crystallized product was washed three times with deionized water, dried at 140°C for 2 hours, and calcined at 700°C for 2 hours to obtain an unbonded carrier NWS3 (SiO 2 with Al 2 o 3 The molar ratio is 100).

[0034] Under the conditions of 80°C, solid-to-liquid ratio of 1:10, and 1 mole of ammonium nitrate solution, NWS3 is exchanged three times with amm...

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Abstract

The invention relates to a method for producing light steam cracking raw materials by catalytic cracking, and aims at mainly solving the technical problems that the catalyst cracking activity is low and the yields of ethylene and propylene are low when an existing method is used for hydrocracking petroleum hydrocarbon to prepare the light cracking raw materials. The problems are solved very well by adopting the technical scheme, hydrocarbon raw materials are in contact with a catalyst bed layer under the conditions that the reaction temperature is 250-500 DEG C, the reaction pressure is 0.1-8MPa and the raw material weight air speed is 0.1-8 per hour, so that effluents containing ethylene and propylene are obtained, wherein the catalyst is prepared from the following components in percentage by mass: (a) 0.1%-2.0% of at least one of Pd and Pt; and (b) 98%-99.9% of at least one of a ZSM-5 molecular sieve carrier and a ZSM-11 molecular sieve carrier which is prepared by a non-adhesive method. The method can be used for industrial production of hydrocracking to prepare the light cracking raw materials.

Description

technical field [0001] The invention relates to a method for producing light steam cracking raw materials by catalytic cracking, in particular to producing light cracking raw materials, mainly ethane and propane, by hydrocracking pure hydrocarbons or mixtures between C4 and C20 as raw materials Methods. Background technique [0002] Ethylene and propylene are the two most important basic organic chemical raw materials. At present, the main production method of ethylene and propylene is still through steam cracking. At present, a large number of industrial data have confirmed that the yield of ethylene and propylene in the cracking products shows a downward trend as the cracking raw material becomes heavier. Taking ethane as an example, at a reaction temperature exceeding 850°C, the yield of ethylene can reach more than 75%. However, at similar cracking temperatures for propane, the yield of ethylene + propylene can reach 60%. At present, with conventional naphtha as raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C07C9/06C07C9/08C07C4/06C01B39/40C01B39/36
Inventor 汪哲明许烽肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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