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Method for preparing ethylene cracking material by hydrogenation of liquefied petroleum gas

A liquefied petroleum gas and ethylene cracking technology, which is applied in the petroleum industry, liquid hydrocarbon mixture production, refining to remove heteroatoms, etc., can solve the problems of production equipment shutdown and decoking, olefin content is difficult to reach the target, easy to coke, etc., to achieve Effect of reducing hydrogen cost

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1145891A has introduced a kind of hydrogenation method, but this method is only applicable to C 5 Distillate Hydrogenation to Pentane
[0015] Furthermore, currently in industry C 4 There are still the following problems in the production of distillate hydrogenation: (1) The reaction temperature is high, and the reaction result is greatly affected by the thermodynamic equilibrium
For example, the FH-40C hydrofining catalyst developed and produced by Fushun Petrochemical Research Institute is a catalyst with very good hydrogenation performance, but for this reaction, the initial reaction temperature is 210 ° C, and the activity is better. It is at 240-300°C, so even if the inlet temperature of the reaction is set at 210°C, the outlet temperature reaches 380°C (outlet temperature=inlet temperature+adiabatic temperature rise=210+170=380°C), exceeding 340°C, no Conducive to the deep hydrogenation of olefins
Industry C 4 The distillate is used as ethylene cracking material after hydrogenation, and the target requirement is that the olefin content is less than 1.0v%. For this reaction, when the reaction temperature exceeds 340°C, the olefin content in the reaction product is very difficult due to the influence of the chemical balance. reach target
(2) Coking is easy at the entrance of the reaction bed, and the resistance of the reaction bed increases rapidly, resulting in frequent shutdowns of the production equipment for decoking, so as to reduce the resistance of the reaction bed and maintain normal production

Method used

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  • Method for preparing ethylene cracking material by hydrogenation of liquefied petroleum gas
  • Method for preparing ethylene cracking material by hydrogenation of liquefied petroleum gas
  • Method for preparing ethylene cracking material by hydrogenation of liquefied petroleum gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0030] The catalyst is divided into four sections for loading. According to the flow direction of the reactants, the catalyst volume consumption of each section is as follows: 10%, 15%, 25%, 50%, and the total catalyst consumption is 100ml. Reaction raw materials: hydrogen is electrolytically purified hydrogen with a purity >99%; the C4 fraction is obtained from Fushun Petroleum No. 2 Plant, and its composition is shown in Table 3. The reaction is upper feeding, the reaction material flows out from the bottom of the reactor, and enters the separator after cooling, the tail gas is discharged from the top of the separator, the liquid phase at the bottom is regularly sampled, and the composition is analyzed by gas chromatography. The specific reaction conditions and results are listed in Table 4 .

[0031] Table 3 Composition of carbon four fractions

[0032]

[0033]

[0034] Table 4 reaction conditions and results

[0035]

Embodiment 4～7

[0037]The catalyst is divided into 3 stages of loading. According to the flow direction of the reactants, the catalyst volume consumption of each stage is: 15%, 30%, 55%, and the total volume of the catalyst is 100ml of FH-40C catalyst. Reaction raw materials: C4 fraction is taken from Fushun Petroleum No. 2 Plant, the composition is shown in Table 3, and the specific reaction conditions and results are listed in Table 5.

[0038] Table 5 reaction conditions and results

[0039]

[0040]

Embodiment 8

[0042] According to the method of embodiment 1, carry out stability test, concrete reaction condition and result are listed in table 6.

[0043] Table 6 stability test conditions and results

[0044] Run number

[0045] From the data in Table 6, it can be seen that at the end of the catalyst activity stability experiment, the catalyst has been running for 500 hours, and the catalyst still has good activity, indicating that the catalyst has better activity stability under the experimental conditions.

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Abstract

The invention discloses a method for preparing ethylene cracking material by hydrogenation of liquefied petroleum gas. In the method, a non-noble metal hydrogen refining catalyst is used and is filled by 3 to 5 stages; along the flowing direction of reaction materials, the used volume of the catalyst increases stage by stage by 5 to 30 percent; the volume of the catalyst in the first stage is 8 to 20 percent based on the total volume of the catalyst; and the volume of the catalyst in the last stage is 40 to 65 percent based on the total volume of the catalyst. Compared with the prior art, the method expands a hydrogen source, reduces hydrogen cost, and solves the problem that the olefin content after hydrogenation does not meet requirements due to factors including thermodynamic control and the like.

Description

technical field [0001] The invention relates to a method for preparing ethylene cracking material from liquefied petroleum gas, especially by C 4 The distillate is used as the reaction raw material, and the ethylene cracking material is prepared by hydrogenation treatment. Background technique [0002] With the development of oil refining industry, especially the continuous development of catalytic cracking technology, people pay more and more attention to the deep processing of refinery gas. There are many ways to utilize refinery gas, among which hydrogenation of liquefied gas is one of the topics that people generally pay attention to. Liquefied petroleum gas has many uses after hydrogenation, such as ethylene cracking raw material, raw material for maleic anhydride synthesis, and vehicle liquefied gas. Among them, liquefied petroleum gas is used as ethylene raw material because of its large amount and many production devices involved, so it is prepared attention. [0...

Claims

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Application Information

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IPC IPC(8): C10G45/08C10G50/00
Inventor 乔凯方向晨艾抚宾郭蓉徐彤
Owner CHINA PETROLEUM & CHEM CORP