Method for producing propylene maximally with C5 olefin as main raw material

A raw material, propylene technology, used in ethylene production, bulk chemical production, chemical instruments and methods, etc.

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 with C5

Method used

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  • Method for producing propylene maximally with C5 olefin as main raw material
  • Method for producing propylene maximally with C5 olefin as main raw material
  • Method for producing propylene maximally with C5 olefin as main raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as Figure 1 to Figure 3 Shown, a kind of method based on C5 olefin-based raw material to maximize the production of propylene, comprising the following steps:

[0056] S1 pretreatment unit operation: pass the C5 raw material from MTO containing diolefins into the purifier 1 for adsorption operation to remove impurities such as oxygen-containing compounds in the raw material. The adsorbent filled in the purifier 1 is 3A molecular sieve Adsorbent;

[0057] S2 Selective hydrogenation unit operation: The purified C5 raw material is transported to the mixer 2 by the raw material pump 201 and mixed with the hydrogen compressed by the hydrogen compressor 10, and the above mixture is preheated in the hydrogenation preheater 121 Pass into the hydrogenation reactor 12 to carry out the selective hydrogenation reaction of the C5 raw material. After the obtained monoolefin C5 material is cooled by the hydrogenation cooler 122, gas-liquid separation is carried out in the hydro...

Embodiment 2

[0063] Such as Figure 4 As shown, the method for maximizing the production of propylene with C5 olefins as the main raw material in this example is basically similar to that of Example 1, the main difference being that 30m% of the intermediate reaction product obtained at the bottom of the rectifying tower 41 in the step S5 is returned to The inlet to the multistage prereactor 3 is again subjected to selective superposition reaction.

[0064] The catalyst loaded in the catalytic cracking reactor 7 is MCM22 and MCM41 molecular sieve composite catalyst, the reaction temperature of the selective hydrogenation reaction is 100°C, the reaction pressure is 1.8MPa, and the space velocity is 20h -1 ; 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 temperature at the top of the rectifying tower 41 is 50°C, the temperature at the bottom of the tower is 210°C, and the pressure at the top of ...

Embodiment 3

[0067] Such as Figure 5 As shown, the method of maximizing the production of propylene with C5 olefins as the main raw material in this example is basically similar to that of Example 2, the main difference being that the materials at the outlet of the tower bottom of the first pre-reactor 31 are transported by the first circulation pump 311 Return to the tower top of the first prereactor 31 after the cooling of the first superimposed cooler 312, and the tower bottom outlet part material of the second prereactor 32 is transported by the second circulation pump 321 and the second superimposed cooler 322 and return to the top of the second prereactor 32 after being cooled, and part of the material at the outlet of the tower bottom of the third prereactor 33 is transported by the third circulating pump 331 and cooled by the third stacked cooler 332 and then returned to the third The top of the pre-reactor 33.

[0068] The catalyst loaded in the catalytic cracking reactor 7 is a...

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PUM

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Abstract

The invention discloses a method for producing propylene maximally with C5 olefin as a main raw material. The method comprises the following steps that S1, the C5 olefin raw material is injected intoa purifier for removing impurities such as oxygen-contained compounds; S2, selective hydrogenation reaction is conducted in a hydrogenation reactor, and thus a mono-olefin C5 material is obtained; S3,after being heated, the mono-olefin C5 material is delivered to a catalytic cracking reactor to be subjected to cracking reaction, and thus a cracking product containing ethylene and propylene is obtained; and S4, after cooling compression, propylene separation and purification are conducted in a de-heavy fractionator and athe rectifying tower sequentially, and thus purified high-purity propyleneand residual butane are obtained; S5, and the residual butane and materials at a fractionator kettle of the de-heavy fractionator are mixed and then delivered to the pre-reactor, selective polymerization of the olefin is conducted, and an obtained intermediate reaction product returns to the step S3 to be subjected to cracking reaction. According to the method for producing the propylene maximally with the C5 olefin as the main raw material, the yield of the propylene is 60m% or above of the raw material, meanwhile, less than 30m% of the ethylene is produced secondarily, equipment adopted bya 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 from C5 olefin-based raw materials. Background technique [0002] In the field of refining and chemical industry, the steam cracking process produces a large amount of propylene, and at the same time produces a large amount of C5 olefins. With the deepening of refining and chemical integration, how to make full use of C5 olefins is very important. [0003] First of all, the MTO process has gradually matured in China and has been promoted in large-scale industries. The high-concentration C5 olefins produced by this process have not been well utilized; on the other hand, the demand for propylene in the polypropylene industry in the chemical industry is increasing year by year, and the supply of propylene monomer is in short supply. This prompted us to investigate how C5 olefins can maximize the production of pr...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/04C07C11/06C07C2/12C07C11/02C07C5/05C07C11/10C07C7/13C07C11/173C07C7/04
CPCC07C2/12C07C4/06C07C5/05C07C7/04C07C7/13C07C2529/80C07C11/04C07C11/06C07C11/02C07C11/10C07C11/173Y02P20/52Y02P30/40
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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