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C3 fraction selective liquid phase hydrogenation method

A selective hydrogenation and liquid-phase hydrogenation technology, which is applied in the fields of hydrocarbons, distillation purification/separation, chemical instruments and methods, etc., can solve the problems of slow reaction speed, and the conversion rate of propyne and propadiene needs to be further improved , to achieve the effect of increasing the conversion rate and increasing the reaction speed

Pending Publication Date: 2020-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned methods for the selective hydrogenation of C3 fractions to remove propyne and propadiene all have the disadvantage of slow reaction speed, and the conversion rate of propyne and propadiene needs to be further improved.

Method used

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  • C3 fraction selective liquid phase hydrogenation method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] according to figure 1 The flow process of the selective liquid-phase hydrogenation of the carbon three cuts of the present invention is shown.

[0049] The fresh C3 fraction a containing propyne and / or propadiene extracted from the top of the depropanizer (the sum of the molar content of propyne and propadiene is 2.37%, and the system also contains propane and a small amount of C4 , carbon five), recycle stream b, supplementary stream c of fluorocarbon surfactant (purchased from DuPont, brand F-1157) and hydrogen stream d are mixed and enter from trickle bed selective hydrogenation reactor R1 top inlet, from From top to bottom, pass through the selective hydrogenation catalyst bed in the selective hydrogenation reactor (the height of the catalyst bed is 3000mm, the diameter is 1300mm), and the C3 selective hydrogenation catalyst (the catalyst is the BC- L-83, with a diameter of 4 mm) to obtain hydrogenation material f after selective hydrogenation.

[0050] Wherein, t...

Embodiment 2

[0054] according to figure 1 The flow process of the selective liquid-phase hydrogenation of the carbon three cuts of the present invention is shown.

[0055] The fresh C3 fraction a containing propyne and / or propadiene extracted from the top of the depropanizer (the sum of the molar content of propyne and propadiene is 2.58%, and the system also contains propane and a small amount of C4 , carbon five), recycle stream b, stream c of fluorocarbon surfactant (purchased from DuPont, brand FS-3100) and hydrogen stream d are mixed and then enter from the trickle bed selective hydrogenation reactor R1 top inlet, from the top Down through the selective hydrogenation catalyst bed in the selective hydrogenation reactor (the height of the catalyst bed is 3000mm, and the diameter is 1300mm), and the C3 selective hydrogenation catalyst (the catalyst is BC-L provided by Sinopec Beijing Research Institute of Chemical Industry) -83, with a diameter of 4mm) to obtain hydrogenation material f...

Embodiment 3

[0060] according to figure 1 The flow process of the selective liquid-phase hydrogenation of the carbon three cuts of the present invention is shown.

[0061] The fresh C3 fraction a containing propyne and / or propadiene extracted from the top of the depropanizer (the sum of the molar content of propyne and propadiene is 1.5%, and the system also contains propane and a small amount of C4 , carbon five components), recycle stream b, stream c of fluorocarbon surfactant (purchased from DuPont, brand FS-60) and hydrogen stream d are mixed and then enter from the trickle bed selective hydrogenation reactor R1 top inlet, from From top to bottom, pass through the selective hydrogenation catalyst bed in the selective hydrogenation reactor (the height of the catalyst bed is 3000mm, the diameter is 1300mm), and the C3 selective hydrogenation catalyst (the catalyst is the BC- L-83, with a diameter of 4 mm) to obtain hydrogenation material f after selective hydrogenation.

[0062] Wherei...

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Abstract

The invention relates to the field of petrochemical engineering. The invention provides a C3 fraction selective liquid phase hydrogenation method. The method comprises the steps: (1) contacting a fresh C3 fraction a containing propyne and / or propadiene, a circulation material flow b, a surfactant supplement material flow c and a hydrogen material flow d with a selective hydrogenation catalyst in aselective hydrogenation reactor under selective hydrogenation conditions to carry out selective hydrogenation so as to obtain a hydrogenation material f; (2) carrying out pressure reduction on the hydrogenated material f obtained in the step (1) and then carrying out gas-liquid separation so as to obtain a gas-phase material flow h containing propylene and propane and a liquid-phase material flowg containing propylene, propane and a surfactant; and (3) dividing the liquid-phase material flow g containing propylene, propane and a surfactant into a first part material flow i and a second partmaterial flow j, wherein the second part material flow j is used as a circulating material flow b. The C3 fraction selective liquid phase hydrogenation method provided by the invention can reduce theuse amount of the catalyst and improve the conversion rate of propyne and / or propadiene, and the operation process is simple.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for selective liquid-phase hydrogenation of carbon three fractions. Background technique [0002] Raw materials such as light hydrocarbons, naphtha or diesel oil can be cracked to obtain cracked gas, and the carbon three components in the cracked gas contain 1.5-8.0% (mol) of propyne and propadiene (abbreviated as MAPD). The existence of MAPD will affect the propylene polymerization reaction of the latter system, reduce the activity of the catalyst, and at the same time make the properties of the polymerization product deteriorate. Catalytic selective hydrogenation is mostly used in industry to remove alkynes and dienes. This process is divided into gas phase selective hydrogenation and liquid phase selective hydrogenation. The current liquid phase selective hydrogenation process of carbon three fractions usually requires multi-stage reactors Arranged in series or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C5/09C07C5/05C07C11/06C07C5/08C07C5/03C07C9/08
CPCC07C7/005C07C7/09C07C7/04C07C5/09C07C5/05C07C5/08C07C5/03Y02P20/52
Inventor 李宏光王国清刘俊杰张利军杨士芳房艳乐毅杨沙沙李晓锋郭敬杭
Owner CHINA PETROLEUM & CHEM CORP