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Method for removing micro-quantity alkene in aromatic hydrocarbon

A technology for aromatics and olefins, which is applied in the field of removing trace olefins in aromatics by using solid acid catalysts. It can solve problems such as poor hydrothermal stability, limited application prospects, and weak acidity, and achieves low environmental impact, simple process flow, and high activity. good stability effect

Active Publication Date: 2014-12-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such mesoporous molecular sieves have disadvantages such as weak acidity and poor hydrothermal stability, so their application prospects are greatly limited.

Method used

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  • Method for removing micro-quantity alkene in aromatic hydrocarbon
  • Method for removing micro-quantity alkene in aromatic hydrocarbon
  • Method for removing micro-quantity alkene in aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the synthesis of Al-HMCM-41 mesoporous / Hβ microporous composite molecular sieve catalyst

[0034] 1.0 g of Hβ microporous molecular sieve powder was used as the inner core, and 10.0 g of 15.0 wt % cetyltrimethylammonium bromide aqueous solution was stirred and mixed for 1.0 hour to obtain a mixture A. According to Al 2 o 3 : SiO 2 :CTMAB:NaOH:ETHA:H 2 The raw material molar ratio of O is 1:10.0:1.4:2.4:8.67:140.0, weigh 4.86 grams of alumina monohydrate, and a certain amount of silica sol, cetyltrimethylammonium bromide (CTMAB), hydroxide Sodium, ethanol (ETHA) and deionized water were stirred and mixed at 70°C for 0.5 hours to make mixture B; mixture A was added to mixture B, stirred and mixed at 70°C for 4.5 hours, and the resulting The obtained mixture was added to an autoclave, and crystallized at 150°C and autogenous pressure for 24 hours to obtain a crystallized product, and then the crystallized product was filtered, washed with water, dried, an...

Embodiment 2～6

[0036] Using HZSM-5 molecular sieve, HY molecular sieve, HUSY molecular sieve, HMOR molecular sieve, HMCM-22 molecular sieve respectively as the core microporous molecular sieve, after hydrothermal synthesis, tablet molding, other operations are the same as in Example 1, to obtain mesoporous / microporous core-shell Type composite molecular sieve catalysts are listed in Table 1.

[0037] Table 1

[0038]

Embodiment 7～26

[0040] Using the same operation as in Example 1, the difference is that butyl titanate, cobalt nitrate, zinc nitrate, gallium nitrate, manganese nitrate, strontium nitrate, zirconium nitrate, calcium nitrate, magnesium nitrate, iron nitrate, nickel nitrate, nitric acid Vanadium, chromium nitrate, germanium nitrate, tin nitrate, molybdenum nitrate, niobic acid, copper nitrate, tungstic acid, and boric acid are used as the precursors of the substituting element M, and the M-HMCM-41 mesoporous / Hβ microporous core-shell containing the substituting element is synthesized Type composite molecular sieve catalyst, the mass fraction of the core Hβ microporous molecular sieve is 15.8%, listed in Table 2.

[0041] Table 2

[0042]

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PUM

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Abstract

The invention discloses a method for removing micro-quantity alkene in aromatic hydrocarbon. The method comprises the following steps of: contacting and reacting the aromatic hydrocarbon with a solid acid catalyst under the condition of temperature of 30-350 DEG C, pressure of 0.1-12MPa and feeding quality airspeed of 0.1-15 h<-1>, so that micro-quantity alkene in the aromatic hydrocarbon undergoes adsorbing, overlapping and alkylation reaction so as to remove the micro-quantity alkene in the aromatic hydrocarbon. The method is simple in process procedure, free of oxygen consumption and low in device investment and operation expense; and the catalyst is good in activity stability, the device is long in stable operation time, the aromatic hydrocarbon loss is small, the frequent switching operation between reactor reaction and regeneration is avoided, and the catalyst can be regenerated, so that a great deal of waste catalyst is prevented from being buried, and the environment is less polluted.

Description

(1) Technical field [0001] The invention relates to a method for removing trace olefins in aromatic hydrocarbons, in particular to a method for removing trace olefins in aromatic hydrocarbons by using a solid acid catalyst for reaction. (2) Background technology [0002] Aromatic hydrocarbons are important basic raw materials, and the petrochemical industry produces aromatic hydrocarbons through processes such as naphtha reforming and steam cracking. A certain amount of olefin impurities (less than 1%) exist in the aromatics products of these processes. This part of the olefins is active and easily forms colloids, which affects the quality of aromatics products, and has adverse effects on some subsequent chemical processes, affecting the further development of aromatics. processing and utilization. Therefore, in order to obtain qualified chemical raw materials and ensure the smooth progress of subsequent processes, the olefin impurities in aromatics must be deeply removed. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/148C07C15/02C07C15/04C07C15/06C07C15/08
CPCY02P20/584
Inventor 任杰袁海宽金辉
Owner ZHEJIANG UNIV OF TECH
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