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Method for producing isoalkanes from n-alkanes through catalysis

A technology for n-alkanes and iso-alkanes, which is applied in the fields of isomerization to produce hydrocarbons, chemical instruments and methods, catalysts for physical/chemical processes, etc.

Inactive Publication Date: 2014-07-16
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] [2] In order to further improve the catalytic performance of the above [1], initiators such as n-butanol, isobutene, isobutane and isopentane can be added to the reaction system, and it is found that the reaction rate can be increased, especially when isopentane is added , the conversion rate of n-hexane can reach 85.54%, and the liquid yield is 80.08%, but the selectivity of 2,2-dimethylbutane and 2,3-dimethylbutane in the product is still low, being 7.6% and 2,3-dimethylbutane respectively. 3.75%
Third, this type of ionic liquid is not easy to regenerate, the cost is high, and it is difficult to achieve large-scale industrial production
[0027] Although the prior art discloses a method for isomerizing alkanes using sulfonic acid-type ionic liquid catalysts, the raw materials are all isoparaffins, and olefins must be added to react together, which leads to complex components in the resulting product, and the expected isoparaffins The content is too low, which affects the performance of the final product
[0028] So far, although a great deal of research has been done on sulfonic acid-based ionic liquids, there has not been any report on the direct isomerization of n-paraffins without alkenes

Method used

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  • Method for producing isoalkanes from n-alkanes through catalysis
  • Method for producing isoalkanes from n-alkanes through catalysis
  • Method for producing isoalkanes from n-alkanes through catalysis

Examples

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preparation Embodiment 1

[0089] Under solvent-free conditions, N-methylimidazole and 1,4-butane sultone in equal amounts were mixed in a three-necked flask, stirred at room temperature for 20 minutes, heated to 80°C and stirred for 24 hours to obtain White solid, through organic solvent cleaning, vacuum drying, obtains the alkylimidazole salt containing sulfonic acid group namely 1-methyl-3-(4-sulfonic acid butyl)-imidazole salt [abbreviated as MimN(CH 2 ) 4 SO 3 ].

[0090] The alkylimidazolium salt obtained above and the sulfuric acid (H 2 SO 4 ) were mixed in a three-necked flask, and stirred at 60°C for 24 hours to obtain a sulfonic acid functionalized ionic liquid, namely 1-methyl-3-(4-sulfonic acid butyl)-imidazole bisulfate [abbreviated as MimN(CH 2 ) 4 SO 3 H[HSO 4 ]], after vacuum drying, collected in a desiccator for later use. Its infrared absorption spectrum is attached figure 1 As shown in , the absorption peaks are assigned as follows:

[0091] 1-Methyl-3-(4-sulfobutyl)-imidazo...

preparation Embodiment 2

[0094] Dissolve 1,3-propane sultone in an appropriate amount of methanol, then add an equal amount of pyridine, stir at room temperature for 20 minutes, heat to 80°C and stir for 24 hours to obtain a white solid, which is washed with an organic solvent and vacuum Drying affords N-(3-sulfonic acid)propyl-pyridinium salt containing sulfonic acid groups.

[0095] The pyridinium salt obtained above and trifluoromethanesulfonic acid (CF 3 SO 3 H) Mix in a three-necked flask and stir at 80°C for 12 hours to obtain a sulfonic acid functionalized ionic liquid, namely N-(3-sulfonic acid) propyl-pyridine trifluoromethanesulfonate [abbreviated as PyN(CH 2 ) 3 SO 3 H[CF 3 SO 3 ]], after vacuum drying, collected in a desiccator for later use.

preparation Embodiment 3

[0097] Except that 1,4-butane sultone was used instead of 1,3-propane sultone, and sulfuric acid was used instead of trifluoromethanesulfonic acid, the sulfonic acid functionalized ionic liquid was prepared in the same manner as in Preparation Example 2, namely N-(4-sulfonic acid) butyl-pyridine bisulfate [abbreviated as PyN(CH 2 ) 4 SO 3 H[HSO 4 ]], after vacuum drying, collected in a desiccator for later use. Its infrared absorption spectrum is attached figure 2 As shown in , the absorption peaks are assigned as follows:

[0098] N-(4-sulfonic acid) butyl-pyridine bisulfate IR spectrum data

[0099]

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Abstract

The invention relates to a sulfonic acid-functionalized ionic liquid used as a catalyst and a method for producing isoalkanes from n-alkanes, in particular to a method for producing isohexane form n-hexane. The ionic liquid is [A]n<+>[B]n<->, wherein [A]n<+> is a sulfonic group-containing organic cation and [B] n<-> is the corresponding organic anion or inorganic anion. According to the invention, the process, which applys the ionic liquid, has the advantages of low reaction temperature, low catalyst cost, high conversion of n-alkanes and high selectivity of isoalkanes, and has good social and economic benefits.

Description

technical field [0001] The invention relates to a method for isomerizing normal alkanes, in particular to a method for using sulfonic acid functional ionic liquid as a catalyst to catalyze the isomerization of normal alkanes to produce isoparaffins, which belongs to the field of petrochemical industry. Background technique [0002] Octane number is one of the most important parameters to measure the anti-knock performance of gasoline engine fuel. It is the first choice index to consider the quality of gasoline for vehicles. The higher the octane number of gasoline, the better the anti-knock performance, and the engine can use a higher compression ratio, thereby improving engine power and combustion efficiency, which can not only increase the mileage of the vehicle, but also save considerable energy. Therefore, it is of great significance to improve the power performance of gasoline and slow down the consumption process of non-renewable petroleum resources. [0003] In rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/16C07C5/27B01J31/02
Inventor 杨淑清竺柏康郑贤敏张仁坤
Owner ZHEJIANG OCEAN UNIV
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