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Process of carrying out reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene)

A rectification coupled and selective technology, applied in the direction of hydrocarbons, distillation purification/separation, hydrocarbon purification/separation, etc., can solve the problems that the concentration of propylene cannot be effectively reduced, and the selectivity of propylene has not been greatly improved. , to achieve the effect of high catalyst efficiency and low dosage

Active Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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%, and the propylene concentration in the rectifying tower reactor is also low. can effectively reduce, and the selectivity of MAPD into propylene has not been greatly improved

Method used

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  • Process of carrying out reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene)
  • Process of carrying out reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene)
  • Process of carrying out reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 As shown, the C3 fraction 201 has a flow rate of 22t / h, a MAPD content of 3.5%, a propylene content of 92.8%, and enters the propylene rectifying tower T-101 from the 100th tray. The pressure inside the tower is 1.6-1.8MPa, the temperature at the top of the tower is 3°C, the reflux ratio is 13.8, and the temperature at the bottom of the tower is 5°C.

[0030] The propylene rectification tower T-101 has 160 trays in total, the 160th tray has normal gas channels, but the bottom of the downcomer is sealed to form a collection tank, the liquid is pumped out from the collection tank and put into 68kg After 202 / h of hydrogen (containing 5% methane), it enters the second fixed bed MAPD reactor R-101, which is filled with BC-L-83 catalyst 2m 3 , The reacted material enters the T-101 column tank from below the 160th plate. The second MAPD reactor is an adiabatic reactor, with one open and one standby, the inlet MAPD concentration is 0.46%, the propylene concentr...

Embodiment 2

[0035] like figure 2 Shown, operating condition is the same as embodiment 1, but liquid is extracted from T-101 tower kettle with pump, enters the second MAPD reactor R-101 of fixed bed after joining the hydrogen 202 (containing 5% methane) of 68kg / h, Internal filling BC-L-83 catalyst 2m 3 , The reacted liquid is returned to the tower kettle after passing through the forced circulation reboiler E-102. The second MAPD reactor is an adiabatic reactor, with one open and one standby, the reaction pressure is 2.0MPa, the inlet MAPD concentration is 0.36%, the propylene concentration is 10.90%, the outlet MAPD concentration is 0.31%, and the propylene concentration is 10.94%. The MAPD conversion was close to 13% with a selectivity to propylene of 70%.

[0036] The production volume of the T-101 tower is 1.15t / h, and the contents of propylene and MAPD are 10.9% and 0.36% respectively.

[0037] The 204 produced in the gas phase at the top of T-101 is 1.83t / h, of which the concentr...

Embodiment 3

[0040] like image 3 As shown, the C3 fraction 201 has a flow rate of 22t / h, a MAPD content of 3.5%, a propylene content of 92.8%, and enters the propylene rectifying tower T-101 from the 105th tray. The pressure inside the tower is 1.6-1.8MPa, the temperature at the top of the tower is 39.4°C, and the temperature at the bottom of the tower is 5°C.

[0041] The propylene rectification tower T-101 has 170 trays in total, the 170th tray has normal gas channels, but the bottom of the downcomer is sealed to form a collecting tank, and the liquid is pumped out from the collecting tank, which is 357.7t / h, after adding 68kg / h of hydrogen 202 (containing 5% methane), it enters the second fixed bed MAPD reactor R-101, and the interior is filled with BC-L-83 catalyst 2m 3 , The reacted liquid enters the T-101 column tank from below the 170th plate. The second MAPD reactor is an adiabatic reactor, using one open and one standby, the inlet MAPD and propylene concentrations are respecti...

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Abstract

The invention discloses a process for carrying reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene) from refined propylene. A C3 fraction directly enters a propylene rectification tower or enters the propylene rectification tower after being pre-transformed by a first MAPD reactor; the MAPD is enriched into a stripping section and a tower kettlein the propylene rectification tower; and liquid is collected from a higher MAPD concentration position in the propylene rectification tower, is mixed with hydrogen to enter a second MAPD reactor andthen return to the propylene rectification tower. The treatment of the C3 fraction realizes the effective separation of the propylene and the MAPD, thereby increasing the selectivity of converting the MAPD into the propylene and realizing the purpose of increasing the yield of the propylene. In addition, the requirement of catalyst activity in the MAPD converting process is greatly reduced.

Description

[technical field] [0001] The invention relates to a process for selectively removing MAPD (Methylacetylene, propyne, Propadiene propadiene) in propylene, in particular to a reaction-rectification coupling process for selectively hydrogenating and removing MAPD for refining propylene, belonging to ethylene technology field. [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 by 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 in the carbon three fraction by catalytic hydrogenation, and then further separate propylene and propane. A polymer grade propylene product is obtained. [0003] The MAPD r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C7/167C07C7/04C07C9/08
CPCY02P20/52
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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