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Catalytic rectification method for removing MAPD by selective hydrogenation

A catalytic rectification and selective technology, applied in the field of ethylene, can solve the problems that the concentration of propylene has not been effectively reduced, the conversion selectivity of MAPD has not been greatly improved, and the selectivity of the hydrogenation process is low, so as to achieve the effect of catalyst deactivation Low, the influence of process conditions is reduced, and the effect of high selectivity

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, similarly, there is no effective separation between propylene and MAPD in the C3 fraction in the depropanizer, and the propylene content in the gas phase produced at the top of the tower is as high as 80% to 95%, resulting in low selectivity in the hydrogenation process. The concentration of propylene in the rectification column reactor has not been effectively reduced, and the conversion selectivity of MAPD has not been greatly improved.

Method used

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  • Catalytic rectification method for removing MAPD by selective hydrogenation
  • Catalytic rectification method for removing MAPD by selective hydrogenation
  • Catalytic rectification method for removing MAPD by selective hydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Such as figure 1 As shown, the propylene rectification tower T-101 has a total of 130 trays, and a catalytic rectification component with a height of 2m is placed under the 130th tray in the stripping section, and its structure is corrugated plate structured packing BCD-1 (purchased from Sinopec Beijing Research Institute of Chemical Industry), using BC-L-83 catalyst (purchased from Sinopec Beijing Research Institute of Chemical Industry) to fill it, the volume filling fraction is about 25%, and the liquid on the 130th tray flows down through the liquid redistributor. The C3 fraction feed 201 has a flow rate of about 22t / h, a MAPD content of about 3.5%, and a propylene content of about 92.8%. It enters the propylene rectifying tower T-101 from the 80th tray. The hydrogen feed 202 contains 5% methane, which is passed into the propylene rectification tower T-101 tower from the bottom of the catalytic rectification component, and the flow rate is 68kg / h. The reaction on t...

Embodiment 2

[0056] Such as figure 2 As shown, the operating conditions are the same as in Example 1, and the two-stage catalytic rectification member (same as in Example 1) is placed on the 121st and 130th tray plates of the propylene rectification tower T-101, and its conversion rate to MAPD is about 25%.

[0057] The output of liquefied gas 206 in the bottom of propylene rectification tower T-101 is 1.14t / h, and the concentration of MAPD and propylene are 0.24% and 9.7% respectively. The selectivity of MAPD to propylene is about 70%.

[0058] The contents of propylene, hydrogen, methane, ethane, and propane at the top of the propylene rectification tower T-101 are 99.3%, 0.07%, 0.25%, 0.055%, and 0.3%, respectively, and the light components are removed by the methane stripping tower T-102 After the propylene extraction 208, the polymer grade propylene product can be obtained, the output is about 20.8t / h, the temperature of the top of the methane stripping tower T-102 is reduced to 5°...

Embodiment 3

[0060] Such as figure 1 Shown, operating condition is the same as embodiment 1, but reflux ratio improves to 20. The hydrogen flow rate is 54kg / h.

[0061] The contents of propylene, hydrogen, methane, ethane, and propane at the top of the propylene rectification tower T-101 are 99.36%, 0.09%, 0.2%, 0.05%, and 0.29%, respectively, and the light components are removed by the methane stripping tower T-102 After the propylene extraction 208, the polymer grade propylene product can be obtained, the output is about 21.08t / h, the gas is cooled to 5°C, the non-condensable gas is extracted 207, the output is about 70kg / h, and the propylene molar concentration is 47%. The weight is about 54kg / h.

[0062] Propylene rectification tower T-101 bottom liquefied gas production 206, production volume is 0.86t / h, in which propylene and MAPD concentrations are 4.4% and 0.20% respectively. The MAPD conversion is about 50%, and the selectivity of MAPD to propylene is about 97%.

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Abstract

The invention provides a catalytic rectification method for removing methyl acetylene and propadiene (MAPD) by selective hydrogenation. The method comprises the following steps of: placing a catalytic rectification member below a C3 fraction feeding position of a propylene rectification tower, introducing hydrogen into the tower from the lower part of the catalytic rectification member, and making the hydrogen upwards flow through the catalytic rectification member; and directly feeding the C3 fraction containing the MAPD into the propylene rectification tower or feeding the C3 fraction whichis pre-transformed through a first MAPD reactor into the propylene rectification tower to perform catalytic rectification and remove MAPD, directly recovering propylene meeting the polymerization level requirement from a lateral line, or recovering the material from the top of the tower, and removing light components to obtain polymerization level propylene, wherein the molar fraction of the MAPDin the tower can be directly reduced to below 0.1 to 2 percent. The method is characterized in that: by using the characteristic of low concentration of the propylene in the propylene rectification tower, the probability of side reaction of transforming the propylene into propane can be reduced, the selectivity of MAPD transformation is improved, and the purpose of high propylene yield is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of ethylene, and relates to a catalytic rectification process for selective hydrogenation and removal of MAPD (Methyl acetylene, propyne; Propadiene, propadiene) for refining propylene, and further relates to a selective hydrogenation Catalytic rectification method of MAPD in carbon removal three cuts. Background technique [0002] Propylene is an important chemical raw material, which is mainly separated from refinery catalytic cracking tail gas and steam cracking products. The gas produced in the steam cracking process contains a large amount of C1-C10 hydrocarbons, hydrogen and a small amount of other gases. To obtain polymer-grade propylene, it is necessary to purify the cracked gas, mainly to separate hydrocarbons with different carbon numbers by rectification, and to remove MAPD (Methyl acetylene, propyne; Propadiene, propadiene), and then further separate propylene and propane to obtain polymer grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C7/04C07C5/05C07C5/09C10L3/12
CPCY02P20/10Y02P20/52
Inventor 刘毅廖丽华程建民刘智信王婧李东风
Owner CHINA PETROLEUM & CHEM CORP
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