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Catalytic cracking method

A catalyst and cracking reaction technology, which is applied in the field of low-carbon olefin yield, can solve the problem of insufficient selectivity of olefins in methanol conversion rate, and achieve the effects of easy control of dehydration reaction conditions, flexible product solutions, and a wide range of raw materials for processing

Active Publication Date: 2012-12-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] It can be seen from the existing technology that the coupling reaction of methanol conversion and catalytic cracking of petroleum hydrocarbons is limited by process conditions, catalyst activity and selectivity, and methanol conversion and olefin selectivity are not high enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 illustrates the catalytic cracking method provided by the present invention.

[0059] The raw material oil for catalytic cracking is Wuhan mixed oil, which is mixed with 70% vacuum wax oil and 30% vacuum residue (see Table 2 for the properties of the raw material). The methanol aqueous solution contains 80% by weight of methanol, and is prepared by adding deionized water to industrial methanol with a purity of 97%.

[0060] Table 2

[0061] project

Density (20℃), g / cm 3

0.9044

Refraction(20℃)

1.5217

Viscosity(100℃)mm 2 / s

9.96

freezing point, ℃

40

Aniline point, ℃

95.8

C wt%

85.98

Hwt%

12.86

S wt%

0.55

N wt%

0.18

Carbon residue wt%

3.0

Distillation range, ℃

initial boiling point

243

5％

294

70％

473

[0062] Catalyst preparation process is as follows: dry ...

Embodiment 2

[0087] Example 2 illustrates the implementation of the catalytic cracking process provided by the present invention on a medium-sized unit operating in continuous reaction-regeneration.

[0088] The catalyst used in the present embodiment, its preparation method is as follows:

[0089] Add 20kg of ZSP-2 zeolite on a dry basis, add 35kg of deionized water for beating, add 10kg of DASY2.0 molecular sieve, and then add 20kg of SAPO-34 molecular sieve (pilot test product of Sinopec Catalyst Jianchang Branch), and beat evenly. Beat 80 kg of aluminum sol, add 30 kg of kaolin on a dry basis, beat evenly, then add the above-mentioned molecular sieve slurry, beat evenly, spray dry, and collect microsphere particles in the range of 30-150 μm. The catalyst microspheres were calcined at 400°C for 1 h, and then treated with 0.5% NH 4 The Cl aqueous solution was exchanged at 80°C for 0.5h, filtered, washed with water, and dried at 120°C for 16h to obtain the special catalyst B of the prese...

Embodiment 3

[0100] Example 3 illustrates the experimental results of simultaneously injecting methanol and ethanol into the oxygenate dehydration reactor in the catalytic cracking method provided by the present invention.

[0101] The preparation process of the present embodiment catalyst is as follows:

[0102] With dry basis (molecular sieve weight basis, the same below) ZSM-5 zeolite (ZSP-3, iron oxide content 2.5wt%, phosphorus pentoxide content 2.9wt%, Sinopec Catalyst Qilu Branch Company product) 2kg, add 45kg to remove Deionized water beating, add REY molecular sieve (CDY, rare earth oxide content 18.7%, unit cell constant 2.469nm, crystallinity 46%, Sinopec Catalyst Changling branch company product) 35kg, then add SRM molecular sieve (SRM-8, Sinopec Catalyst Jianchang branch product) 15kg, beating evenly. 15Kg pseudo-boehmite (product of Shandong Aluminum Factory of Aluminum Corporation of China, the same below) on a dry basis is added to 100 kg of deionized water for beating, an...

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Abstract

A catalytic cracking method includes: hydrocarbon oil cracking raw materials and catalyst regenerant lifted by steam and entering a riser reactor are contacted for the cracking reaction under the cracking reaction condition, the mixture of catalysts and cracking reaction oil gas is obtained at an outlet of a riser and separated in a settler to obtain cracking reaction oil gas and carbon deposit catalysts, the reaction oil gas ascends to enter a product separation system through an oil gas pipeline on the top of the settler, the deposit catalysts descend to enter a steam stripping section, the deposit catalysts subjected to steam stripping enter a regenerator through a spent catalyst circulation line to react with prevailing wind to be burnt, the obtained regenerated fume enters a fume energy recovery system through a fume pipe on the top of the regenerator, and the obtained catalyst regenerant returns to the riser reactor. The catalytic cracking method is characterized by further including steps of cooling 10-50wt% of the carbon deposit catalysts by means of an external heat collection type steam generator, and entering a fluidized bed reactor to contact with an oxygenated compound heated in heat exchange to complete the dehydration reaction, wherein the obtained mixture of catalysts and oil gas products of the dehydration reaction returns to the settler via the top of the fluidized bed reactor to be mixed with the cracking reaction oil gas and the carbon deposit catalysts in the settler.

Description

technical field [0001] The invention relates to a method for increasing the yield of low-carbon olefins such as ethylene and propylene by integrating catalytic cracking of heavy oil with catalytic conversion of oxygen-containing compounds. Background technique [0002] Light olefins include ethylene and propylene, which are the basic raw materials for the production of many important chemical products (such as ethylene oxide, polyethylene, polyvinyl chloride and polypropylene, etc.). With the rapid development of my country's economy and the improvement of people's quality of life, the demand for ethylene and propylene is also increasing rapidly, and the annual growth rate exceeds the world average level. [0003] There are many ways to prepare light olefins. The steam cracking technology of light hydrocarbon raw materials such as naphtha is widely used in the world. More than 90% of the world's total production of ethylene and about 70% of propylene are produced by steam cr...

Claims

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Application Information

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IPC IPC(8): C10G55/06C07C1/24C07C11/04C07C11/06
CPCY02P20/50Y02P20/584
Inventor 李明罡慕旭宏张巍宗保宁舒兴田罗一斌庄立
Owner CHINA PETROLEUM & CHEM CORP
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