Catalytic conversion method for preparing light olefins by using C4-C6 distillates

A catalytic conversion method, C4 fraction technology, applied in the field of catalytic conversion, to achieve the effect of improving cracking conversion efficiency, improving feed characteristics, and increasing overall effective conversion rate

Active Publication Date: 2006-10-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, although many methods for producing ethylene and propylene with light petroleum hydrocarbons as raw materials are disclosed in the prior art, they do not relate to how to effectively utilize C4 fractions while cracking C4-C6 olefins to produce light olefins Catalytic conversion of alkanes in and alkanes in light gasoline fractions to produce light olefins

Method used

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  • Catalytic conversion method for preparing light olefins by using C4-C6 distillates
  • Catalytic conversion method for preparing light olefins by using C4-C6 distillates

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This example illustrates the case of using gaseous hydrocarbons rich in C4 fractions as raw materials and using a CIP catalyst to conduct a single-pass catalytic conversion test under relatively high severity conditions in a small fluidized bed reactor.

[0042] As shown in Table 3, the gaseous hydrocarbons rich in C4 cuts enter the fluidized bed reactor, and the reaction temperature is 650-680 ° C, the pressure at the top of the reactor is 200 kPa, and the water-hydrocarbon mass ratio is 0.08:1. Contact and react with catalyst. The reaction product, steam and spent agent are separated in the settler, and the reaction product is separated to obtain gaseous product and liquid product, while the spent agent is stripped by water vapor to remove the hydrocarbon products adsorbed on the spent agent. The stripped spent catalyst is contacted with heated hot air for regeneration, and the regenerated catalyst is then subjected to a new catalytic conversion reaction. The test co...

Embodiment 2

[0046] This example illustrates the case of carrying out a catalytic conversion test in a small fluidized bed reactor using a CIP catalyst with combined feed of gaseous hydrocarbons rich in C4 fractions and light gasoline fractions.

[0047] As shown in Table 3, the gaseous hydrocarbons rich in C4 fractions first enter the fluidized bed reactor, and contact and react with the CIP catalyst at a reaction temperature of 680 ° C, so that an appropriate amount of coke is formed on the catalyst, and the catalyst is not decomposed. Charred regeneration, and continue to feed the light gasoline fraction shown in Table 2 and continue to contact with the catalyst for reaction. The reaction product, steam and spent agent are separated in the settler, and the reaction product is separated to obtain gaseous product and liquid product, while the spent agent is stripped by water vapor to remove the hydrocarbon products adsorbed on the spent agent. The stripped spent catalyst is regenerated by...

Embodiment 3

[0054] This example illustrates the oligomerization of gaseous hydrocarbons rich in C4 fractions in a down-flow fixed-bed reactor.

[0055] The test device is a descending fixed bed, the maximum bed height can reach 50cm, the bed diameter is 2.2cm, and the catalyst storage capacity can be 50-100g. The catalyst is a high-silicon-aluminum-ratio molecular sieve with a five-membered ring (MFI) structure, and its specific preparation method is as described in Example 1 of CN1072032C. According to molecular sieve: aluminum sol (as Al 2 o 3 Calculated): kaolin (produced in Suzhou, China) = 35:15:50 dry basis weight ratio mixed and extruded into trilobal strips on the extruder, crushed and sieved after drying, 100g was taken and packed into a fixed bed reactor conduct experiment. In the experiment, when the gauge pressure of the system is 4.0MPa and the temperature is in the range of 190-260℃, the space velocity by weight is 0.256h -1 Gather C 4 Raw material, C in the reaction pr...

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Abstract

A catalytic conversion method for producing light olefins from C4-C6 fractions, which is to inject gaseous hydrocarbons rich in C4 fractions into the first cracking reactor alone or together with light gasoline fractions, contact with the catalyst therein, react, and separate the reaction The product and the reacted catalyst, the C4 fraction or C4 fraction in the product and the light gasoline fraction are injected into the oligomerization reactor to contact and react with the oligomerization catalyst inside; the C4 fraction and C4 fraction rich in alkanes are separated from the oligomerization product The above fractions, C4 fractions are returned to the above-mentioned first cracking reactor, and the fractions above C4 are injected into the second cracking reactor, contact and react with the catalyst therein, and separate the obtained reaction product and spent agent, the reaction product It is further separated into various purpose products, and the standby agent is recycled after being stripped and regenerated. The method provides a feasible technical scheme for effectively utilizing the C4 fraction to increase the production of light olefins.

Description

technical field [0001] The invention belongs to a method for catalytic conversion of petroleum hydrocarbons in the absence of hydrogen, more specifically, a catalytic conversion method for producing light olefins by using C4-C6 fractions. Background technique [0002] Small molecule olefins such as ethylene, propylene and butene are the most basic raw materials for organic synthesis. At present, the production of small molecular olefins in the world mainly adopts steam cracking method, but because the high-temperature cracking furnace is easy to coke, the steam cracking device is only suitable for processing light raw material oil, such as natural gas, naphtha and light diesel oil, and also produces by-products A certain amount of aromatic hydrocarbons. The development of technologies to produce light olefins such as ethylene and propylene by using low value-added olefins, such as C4-C7 olefins, can greatly increase the production of light olefins while further broadening t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G51/02
Inventor 高永灿张久顺谢朝钢崔素新朱根权杨义华马建国吴治国
Owner CHINA PETROLEUM & CHEM CORP
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