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Method for producing propylene maximally with C4-C8 olefin as raw material

A C4-C8 raw material technology, applied in the field of olefin cracking

Active Publication Date: 2019-02-22
宁波旭合瑞石化工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above deficiencies in the prior art, the main purpose of the present invention is to provide a method for maximizing the production of propylene using C4-C8 olefins as raw materials, which is used to solve the problem of fully utilizing C4-C8 olefins in the process of refining and chemical integration

Method used

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  • Method for producing propylene maximally with C4-C8 olefin as raw material
  • Method for producing propylene maximally with C4-C8 olefin as raw material
  • Method for producing propylene maximally with C4-C8 olefin as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Such as figure 1 and figure 2 Shown, a kind of method using C4-C8 olefins as raw material to maximize the production of propylene may further comprise the steps:

[0055] S1 pretreatment unit operation: The C4 olefin mixture raw material with various oxygen-containing compounds and other impurities is passed into the purifier 1 for adsorption operation to remove the oxygen-containing compounds and other impurities in the raw material. The purifier 1 is filled with The adsorbent is 3A molecular sieve adsorbent;

[0056] S2 Selective stacking unit operation: the purified raw materials are sequentially delivered to the three-stage pre-reactor 3 and catalytic rectification tower 41 connected in series, and the multi-stage pre-reactor 3 and catalytic rectification tower 41 are filled with Catalyst is resin type catalyst, and described three stage prereactor 3 comprises first prereactor 31, second prereactor 32, the 3rd prereactor 33, and the raw material after mixing is f...

Embodiment 2

[0060] Such as image 3As shown, the method for maximizing the production of propylene using C4-C8 olefins as raw material in this example is basically similar to that of Example 1, the main difference being that in the step S2, the pretreated raw material enters the multi-stage prereactor 3, the inhibitor and the inhibitor are transported to the mixer 2 through the first raw material pump 201 and the second raw material pump 202 for mixing, and then transported to the multi-stage pre-reactor 3. and 1.0m% of the total amount of inhibitor, said inhibitor being tert-butanol.

[0061] Among the obtained products, the ethylene yield was 3.5m% of the raw material, and the propylene yield was 89.8m% of the raw material.

Embodiment 3

[0063] Such as Figure 4 As shown, the method for maximizing the production of propylene using C4-C8 olefins as raw materials in this example is basically similar to that of Example 2, the main difference being that the intermediate reaction product obtained at the bottom of catalytic distillation tower 41 in step S2 is 30m% Return to the inlet of the multi-stage pre-reactor 3 to carry out the selective superimposition reaction again.

[0064] The catalyst loaded in the catalytic cracking reactor 7 is ZSM5 and ZSM35 molecular sieve composite catalyst, the reaction temperature of the selective superposition reaction is 60°C, the reaction pressure is 1.2MPa, and the space velocity is 1.2h -1 ; The catalytic rectification tower 41 tower top temperature is 50 ℃, the bottom temperature is 210 ℃, the tower top pressure is 0.7MPa; the reaction temperature of the cracking reaction is 380 ℃, the reaction pressure is 1.0MPa, and the space velocity is 0.1h -1 .

[0065] Among the obtai...

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Abstract

The invention discloses a method for producing propylene maximally with C4-C8 olefin as a raw material. The method comprises the following steps that S1, the C4-C8 olefin raw material is injected introduced injected into a purifier to be subjected to adsorption operation, so that impurities such as oxygen-contained compounds in the raw material are removed; S2, the purified raw material is delivered into a pre-reactor and a catalytic rectifying tower, selective polymerization of the C4-C8 olefin is conducted, and an intermediate reaction product is obtained at the tower bottom of the catalyticrectifying tower; S3, the intermediate reaction product is repurified and preheated sequentially, and then delivered to a catalytic cracking reactor to be subjected to cracking reaction, and thus a cracking product containing the propylene is obtained; and S4, after cooling compression, propylene separation and purification are conducted in a de-heavy fractionator and the rectifying tower sequentially, thus purified high-purity propylene and residual butane are obtained, and the residual butane returns to the step S2 to be subjected to polymerization. According to the method for producing thepropylene maximally with the C4-C8 olefin as the raw material, the yield of the propylene is 85m% or above of the raw material, equipment adopted by a system is simple, operability is high, investment is small, and the operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of olefin cracking, and in particular relates to a method for maximizing the production of propylene by using C4-C8 olefins as raw materials. Background technique [0002] In the field of refining and chemical industry, catalytic cracking and steam cracking processes produce a large amount of propylene, and at the same time, a large amount of C4-C8 olefins are produced. With the deepening of refining and chemical integration, how to make full use of C4-C8 olefins is very important. [0003] First of all, the use of MTBE is gradually restricted in China, which will cause a large amount of isobutene surplus, and how to utilize isobutene resources is imminent; secondly, the MTO process is gradually matured in China and is widely used in industries. The high-concentration C4 olefins and C5 olefins produced by this process have not been well developed. On the other hand, the demand for propylene in the polypropyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06C07C2/12C07C11/02C07C7/13C07C7/04
CPCC07C2/12C07C4/06C07C7/04C07C7/13C07C2529/80C07C11/04C07C11/06C07C11/02Y02P20/10Y02P20/52Y02P20/584Y02P30/40
Inventor 葛年春陈悠前周银凤曹卫民
Owner 宁波旭合瑞石化工程有限公司
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