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A method for removing olefins in aromatics raw materials

A technology for aromatic hydrocarbons and raw materials, applied in the field of removing olefins in aromatic hydrocarbon raw materials

Active Publication Date: 2022-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for removing olefins in aromatics raw materials in order to overcome the problem that the molecular sieve catalyst for reducing olefins in the prior art needs to be used in conjunction with clay, and the stability and stability of the molecular sieve catalyst need to be further improved. On the one hand, it avoids the use of clay, on the other hand, it can ensure the service life of the catalyst

Method used

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  • A method for removing olefins in aromatics raw materials
  • A method for removing olefins in aromatics raw materials

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Embodiment approach

[0025] According to a preferred embodiment of the present invention, based on the total amount of the alkyl-substituted arene, the content of the methyl-substituted arene is not less than 75% by weight, preferably 85-99.9% by weight.

[0026] According to a preferred embodiment of the present invention, based on the total amount of the alkyl-substituted arene, the content of the propyl-substituted arene is not higher than 5% by weight, preferably 0-2% by weight.

[0027] The inventors of the present invention found that controlling the content of ethyl-substituted aromatic hydrocarbons, methyl-substituted aromatic hydrocarbons, and propyl-substituted aromatic hydrocarbons in the alkyl-substituted aromatic hydrocarbons is more conducive to further prolonging the service life of the catalyst.

[0028] According to a preferred embodiment of the present invention, in the aromatic hydrocarbon raw material, the colloid content is not more than 200mg / 100mL, preferably not more than 12...

Embodiment 1

[0081] The method for removing olefins in the aromatics raw material is carried out in a fixed-bed reactor, and the loading amount of the catalyst is 1 g. Under the alkylation reaction conditions, the catalysts A, B and C are respectively contacted with the raw material 1 and the raw material 2 for reaction, wherein, Alkylation reaction conditions include: the temperature is 180°C, the reaction pressure is 2.0MPa by gauge pressure, and the mass space velocity of the raw material is 3.0h -1 .

[0082] The preparation method of catalyst A comprises: get 50g commercially available MCM-22 powder samples (commercially purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd., trade mark is XFF09, SiO 2 / Al 2 o 3 The molar ratio is 27) mixed with 15g of alumina, then added 18g of 5% by weight nitric acid and kneaded, then extruded on the extruder to form a strip of Φ1.6 × 2 mm, dried at 120 ° C, and passed through Ammonium nitrate with a mass concentration of 5% is excha...

Embodiment 2

[0091] Xylene is used to dilute the raw material 3, and after dilution, it is filtered to reduce the colloid content to 90mg / 100ml. In the obtained raw material 4, based on the total amount of the alkyl-substituted aromatic hydrocarbons, the methyl-substituted aromatic hydrocarbons The content was 85.2% by weight, the ethyl-substituted arene content was 12.9% by weight, and the propyl-substituted arene content was 1.9% by weight. According to the method of Example 1, the difference is that raw material 1 is replaced by raw material 4, that is, catalysts A, B and C are contacted with raw material 4 for reaction. The result of reaction 24h is listed in Table 2, and the result of reaction 240h is listed in Table 3.

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Abstract

The invention relates to the field of olefin reduction, and discloses a method for removing olefins from aromatic hydrocarbon raw materials. The method includes: contacting aromatic hydrocarbon raw materials with a catalyst under alkylation reaction conditions, wherein the aromatic hydrocarbon raw materials contain olefins and alkanes. Based on the total amount of alkyl-substituted aromatic hydrocarbons, the content of ethyl-substituted aromatic hydrocarbons is not higher than 20% by weight. On the one hand, the method avoids the use of white clay, and on the other hand, it can ensure the service life of the catalyst.

Description

technical field [0001] The invention relates to the field of olefin reduction, in particular to a method for removing olefins from aromatic hydrocarbon raw materials. Background technique [0002] Unsaturated hydrocarbons such as mono-olefins, polyolefins and styrenics commonly found in aromatics feedstocks can lead to undesired side reactions in downstream processes. Therefore, these unsaturated hydrocarbons should be removed by reaction before the aromatic hydrocarbon feedstock is used in other processes. [0003] Industrially, unsaturated hydrocarbons in aromatic hydrocarbon raw materials can be removed by hydrotreating process. This method has high activity and stability, and can partially convert olefins in aromatic hydrocarbon feedstock to alkylaromatic compounds. However, the hydrotreating process usually uses noble metal catalysts, and typical catalysts are disclosed in patent documents CN104342201B, CN106268797B, CN104014337B, and CN1282733C. In addition, it is d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/148C07C15/08C10G29/00
CPCC10G29/00C07C7/148C10G2300/1096C10G2300/70C07C2529/70C10G2400/30C07C15/08
Inventor 胥明高焕新魏一伦
Owner CHINA PETROLEUM & CHEM CORP