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Selective hydrogenation method for C5 fraction of ethylene cracking by-product

A technology for ethylene cracking and by-products, which is applied in the chemical industry and can solve the problems of high monoolefin content, easy coke formation, and low diolefin content

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1145891A discloses a hydrogenation method, the raw material used in this method is the C5 fraction after raffination, wherein the content of monoolefins is high, and the content of diolefins is very low, only 1.5%. This method is only applicable to One-step hydrogenation of C5 fraction to pentane
The main problem is that the ethylene cracking by-product C 5 The distillate has a high content of diolefins and alkynes. During the hydrogenation process, these substances are easy to coke and release heat. Therefore, it is necessary to find a suitable process to realize ethylene crackingC 5 Selective hydrogenation to remove diolefins and alkynes provides technical support for their subsequent deep hydrogenation as raw materials for ethylene cracking. Only in this way can ethylene cracking C be effectively expanded. 5 scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~ Embodiment 7

[0033] The catalyst used in the reaction is LHC1-01; the reactor is an adiabatic reactor. In order to make the temperature of the reaction bed uniform, the catalyst is loaded by stage dilution. According to the flow direction of the reactant, the volume consumption of each section of catalyst in Examples 1 to 4 is successively: 15%, 30%, 55%, and the catalyst loading is 100ml; the volume consumption of each section of catalyst in Examples 5 to 7 is successively: 10%, 15%. %, 25%, 50%, the catalyst loading is 100ml. The reaction raw material is C in the process of ethylene production 5 Raffinate, diluent and C 5 The ratio of the two is C 5 : Diluent volume ratio = 1:2; C 5 The composition of the raffinate is shown in Table 4. The reaction is upper feeding, the reaction material flows out from the bottom of the reactor, and enters the gas-liquid separator after cooling, the tail gas is discharged from the top of the separator, and the liquid phase at the bottom is regularly...

Embodiment 8

[0038] For a catalyst to have industrial application value, in addition to having good conversion rate and selectivity, it must also have good stability. The catalyst used in the reaction is LHC1-01; the reaction process is an adiabatic reactor. In order to make the temperature of the reaction bed uniform, the catalyst is loaded by stage dilution. According to the flow direction of the reactants, the catalyst volume consumption in each stage is as follows: 10%, 15%, 25%, 50%, and the catalyst loading is 100ml. The reaction raw material is C 5 Raffinate, diluent and C 5 The ratio of the two is C 5 : diluent = 1:2; C 5 The raffinate composition is the same as Table 4 in Example 1. The reaction is upper feed, the reaction material flows out from the bottom of the reactor, and enters the gas-liquid separator after cooling, the tail gas is discharged from the top of the separator, and the liquid phase at the bottom is regularly sampled, and the composition is analyzed by gas c...

Embodiment 9

[0042] The catalyst used in the reaction is LHC1-01; the reaction process is an adiabatic reactor. In order to make the temperature of the reaction bed uniform, the catalyst is loaded by stage dilution. According to the flow direction of the reactants, the catalyst volume consumption in each stage is as follows: 10%, 15%, 25%, 50%, and the catalyst loading is 100ml. The reaction raw material is C with high content of dicyclopentadiene 5 Raw materials, diluents and C 5 The ratio of the two is C 5 : diluent = 1:5; see Table 7 for raw material composition, diluent is C 5 mixed alkanes. The reaction is upper feeding, the reaction material flows out from the bottom of the reactor, and enters the gas-liquid separator after cooling, the tail gas is discharged from the top of the separator, and 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 8.

[0043] ...

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Abstract

The invention discloses a selective hydrogenation method for C5 fraction of an ethylene cracking by-product. The selective hydrogenation method comprises the following steps of (1) performing selective hydrogenation by using the C5 fraction of the ethylene cracking by-product as a raw material to remove alkadiene and alkyne, wherein catalyst is arranged in 3-5 reaction sections along flow direction of reaction materials; catalyst volume content in each reaction section is increased by 5-30% than that in the former adjacent reaction section successively; the amount of the catalyst in a first section is 8%-20% of a total volume of the catalyst; and the amount of the catalyst in last section is 40%-65% of the total volume of the catalyst; (2) adding a diluent in the raw material, wherein the diluent is a saturated alkane; and (3) adding a polymerization inhibitor selectively in the raw material. The method can remove alkadiene and alkyne from the C5 fraction with high content of alkadiene and alkyne via selective hydrogenation, simultaneously solves the easy coking problem of the catalyst, and can guarantee that a reaction apparatus runs stably for a long time.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a method for preparing ethylene cracking material by selective hydrogenation of light oil to remove diolefins and alkynes, especially by cracking ethylene to C 5 It is a method for preparing ethylene cracking material through selective hydrogenation treatment of diolefins as reaction raw materials. Background technique [0002] For the raw materials for steam cracking or catalytic cracking to produce ethylene, although the composition of the world's ethylene raw materials has been basically stable for many years, and has always been dominated by naphtha and light hydrocarbons, in recent years, due to the different resources of various countries, the raw material market The change of ethylene raw materials has shown a trend of diversification. For example, liquefied petroleum gas is used as raw material for ethylene cracking after hydrogenation. C of ethylene cracking by-product ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/40
Inventor 徐彤艾抚宾乔凯黎元生袁毅
Owner CHINA PETROLEUM & CHEM CORP
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