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Process for producing propylene and ethylene

A technology of ethylene and propylene, which is applied in the field of producing propylene and ethylene by a method of catalysis, which can solve the problems of poor economic benefit, difficult separation of olefin components and alkane components, poor economic benefits of the separation process, etc. The effect of reducing, reducing energy consumption, and good technical effects

Pending Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of poor economic benefit in the treatment of hydrocarbon streams existing in the prior art, especially the problem of poor economic benefit during the treatment of hydrocarbon streams with low olefin concentration; the olefin components and alkane in the existing hydrocarbon streams Difficult separation of components (separation can only be achieved by extraction), poor economic benefits of the separation process, etc.

Method used

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  • Process for producing propylene and ethylene
  • Process for producing propylene and ethylene
  • Process for producing propylene and ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] use figure 1 The flow shown:

[0049] Stream 1 contains 40% C4 olefins, 4% C5 olefins, 3% C6 olefins, 2% C7 olefins, 1% C8 olefins, 50% C4 alkanes, and its total flow rate is 1000kg / h.

[0050] The stream 3 produced by I (its flow rate is 731 kg / h, and the C4-C8 olefin content is 231 kg / h) is sent to II, and the stream 4 produced by II (its flow rate is 208 kg / h, and its olefin content is greater than 95% ) all return I.

[0051] The ethylene that contains 87kg / in the stream 2 that I obtains, 270g / h propylene, the ethylene propylene yield based on the effective raw material (olefin) in the stream 1 is 71.4%.

[0052] The reaction material that enters in I is stream 1 and stream 5, and wherein stream 1 flow is 1000kg / h, and stream 5 flow is 208kg / h, and total amount is 1208kg / h.

Embodiment 2

[0054] use figure 1 The flow shown:

[0055] Stream 1 contains 40% C4 olefins, 4% C5 olefins, 3% C6 olefins, 2% C7 olefins, 1% C8 olefins, 50% C4 alkanes, and its total flow rate is 1000kg / h.

[0056] The stream 3 produced by I (its flow rate is 730kg / h, and the C4-C8 olefin content is 230kg / h) is sent to II, and the stream 4 produced by II (its flow rate is 207kg / h, and its olefin content is greater than 95% ) 90% return 1.

[0057] The ethylene that contains 85kg / in the stream 2 that I obtains, 259g / h propylene, the ethylene propylene yield based on the effective raw material (olefin) in the stream 1 is 68.8%.

[0058] The reaction material that enters in I is stream 1 and stream 5, and wherein stream 1 flow is 1000kg / h, and stream 5 flow is 186kg / h, and total amount is 1186kg / h.

Embodiment 3

[0060] use figure 1 The flow shown:

[0061] Stream 1 contains 40% C4 olefins, 4% C5 olefins, 3% C6 olefins, 2% C7 olefins, 1% C8 olefins, 50% C4 alkanes, and its total flow rate is 1000kg / h.

[0062] The stream 3 produced by I (its flow rate is 729kg / h, and the C4-C8 olefin content is 229kg / h) is sent to II, and the stream 4 produced by II (its flow rate is 205kg / h, and its olefin content is greater than 95% ) 70% returns 1.

[0063] The ethylene that contains 78kg / in the stream 2 that I obtains, 237g / h propylene, the ethylene propylene yield based on the effective raw material (olefin) in the stream 1 is 63%.

[0064] The reaction material that enters in I is stream 1 and stream 5, and wherein stream 1 flow is 1000kg / h, and stream 5 flow is 144kg / h, and total amount is 1144kg / h.

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Abstract

The invention relates to a method for producing propylene and ethylene. According to the technical scheme, the method comprises the following steps: feeding a hydrocarbon material flow into an olefincracking unit, carrying out a reaction to obtain an ethylene-propylene-containing material flow and an unreacted hydrocarbon material flow, feeding the unreacted hydrocarbon material flow into an olefin superposition unit, and completely or partially circulating back the C8<+> component generated by the olefin superposition unit to the olefin cracking unit. By adopting the technical scheme, the method has the characteristics of small circulation, low energy consumption, good economical efficiency and the like, and is particularly suitable for raw materials with low olefin concentration.

Description

technical field [0001] The invention relates to a method for producing propylene and ethylene, in particular to a method for producing propylene and ethylene by a catalytic method. Background technique [0002] Olefin catalytic cracking technology is a method of using various mixed C4-C6 as raw materials, usually in the presence of molecular sieve catalysts, to catalytically crack olefins contained in raw materials to obtain light molecular olefins propylene and ethylene. At present, several representative olefin catalytic cracking processes mainly include: Propylur process, OCP process, Omega process, OCC process and Superflex process. The Propylur process was developed by Lurgi Company in Germany. It adopts a fixed bed reaction process, uses steam as a dilution raw material, and uses a molecular sieve catalyst. The reaction is carried out adiabatically at 500°C and 0-0.1MPaG. The reactor is a fixed bed type, with two openings and one standby; steam The ratio of the cataly...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/04C07C11/06
CPCC07C4/06C07C2529/40C07C11/04C07C11/06Y02P20/52
Inventor 卢和泮金鑫陈伟
Owner CHINA PETROLEUM & CHEM CORP