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Process for production of aromatic hydrocarbon

A method for producing aromatic hydrocarbons, which is applied in the field of producing aromatic hydrocarbons, can solve problems such as catalyst performance degradation and achieve high selectivity

Inactive Publication Date: 2008-01-30
市川 胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the aromatization reaction process of these improved methane, when using the ZSM-5 supported catalyst, because the aromatic hydrocarbons such as alkylbenzene or naphthalene are still generated with a selectivity of more than 20%, the selectivity of benzene is 70%. %, and with the elapse of the reaction time, it is also observed that the catalyst performance tends to decrease to some extent, etc., and there are still problems as a practical technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (Preparation of samples 1 to 4)

[0053] Relative to 10g of silica / alumina as a metal silicate carrier, the ratio is 32, and the specific surface area is 320m 2 / g of HZSM-5, add 37mg, 92mg, 184mg, 368mg of 3-aminopropyltriethoxysilane in the state of ethanol solution. After fully adsorbing the load, dry it at 120℃ for 16 hours. Calcined at 550°C for 4 hours to obtain a silica-modified HZSM and a carrier. The silica-modified HZSM and the carrier are calculated on a silica basis. The amount of modification is 0.1 parts by weight and 100 parts by weight of metal silicate. 0.25 parts by weight, 0.5 parts by weight, and 1.0 parts by weight.

[0054] The aqueous solution containing 1.174g of ammonium molybdate dissolved in 17ml of ion-exchange water was immersed in the HZSM-5 with different modified amounts of silicon oxide, and after calcination at 550°C for 10 hours, the modified amounts of silicon oxide were 37mg. Sample 1, 92 mg sample 2, 184 mg sample 3, and 368 mg sample 4...

Embodiment 2

[0062] (Preparation of samples 5-7)

[0063] Except for the use of silicon-containing substances with different compositions and amounts to replace the 3-aminopropyltriethoxysilane used in the modification of the metal silicate support in Example 1, the others are the same as in Example 1, using 175 mg Preparation of the catalyst of sample 5 with a modification amount of silicon oxide of 1.1 parts by weight relative to 100 parts by weight of metal silicate support; using 180 mg of propyl triethoxy Silane, the catalyst of sample 6 was prepared with a modification amount of silicon oxide of 1.1 parts by weight relative to 100 parts by weight of metal silicate support; 375 mg of triphenylaminosilane was used to prepare relative to 100 parts by weight of metal silicate Salt carrier, the catalyst of Sample 7 with a modification amount of silicon oxide of 1.1 parts by weight.

[0064] (Manufacturing test of aromatic hydrocarbons)

[0065] Using 1.2 g of each catalyst, an aromatic hydroc...

Embodiment 3

[0068] (Preparation of samples 8 and 9)

[0069] Except for using 280 mg of 18-crown-6 sodium salt in ethanol or 275 mg of hexafluoropentanedione sodium salt instead of the 3-aminopropyl triethoxy group used in the modification of the metal silicate carrier in Example 1. Except that silane was used for modification, the others were the same as in Example 1. The sodium oxide (Na 2 O) was used as a reference, and the modification amounts were 1.1 parts by weight of the catalysts of sample 8 and sample 9 respectively.

[0070] (Manufacturing test of aromatic hydrocarbons)

[0071] Using 1.2 g of each catalyst, the aromatic hydrocarbon production test was performed in the same manner as in Example 1, and the performance of the catalyst was confirmed.

[0072] The obtained measurement results are shown in Table 1.

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Abstract

A process for producing an aromatic hydrocarbon using a lower hydrocarbon as the starting material, the process comprising heating the hydrocarbon in the presence of a catalyst composed of metallosilicate support modified with a silicon compound, a sodium compound or a calcium compound on which a molybdenum compound or a rhenium compound is supported, the silicon compound being a silane compound having a basic group selected from amino, alkylamino and pyridyl groups and an organic group having a size equal to or greater than the pore size of the metallosilicate and selected from trialkoxy and triphenyl groups and, the sodium compound or the calcium compound being a compound having an organic group which has a size equal to or greater than the pore size of the metallosilicate and is selected from crown ether, hexafluoropentadione and acetylacetonate, the catalyst being prepared by impregnating the metallosilicate support with the silane, sodium or calcium compound and then treating the resulting product with heating in an oxygen-containing atmosphere to cause the modification of the metallosilicate support with an oxide of the silane, sodium or calcium compound.

Description

Technical field [0001] The present invention relates to a method for producing aromatic hydrocarbons such as benzene from lower hydrocarbons such as methane. The method uses liquefied petroleum gas, liquefied natural gas, coal dry distillation gas, petroleum refinery gas, naphtha, organic fermentation gas, organic dry distillation gas, and coal reforming A method of producing aromatic hydrocarbons by using gases contained in gas, methane hydrate recovery gas, or the like, or hydrocarbons having 1 to 8 carbon atoms obtained as decomposition products of them, as raw materials. It also relates to an aromatization catalyst using lower hydrocarbons as raw materials. Background technique [0002] Aromatic hydrocarbons such as benzene, toluene, and xylene are mainly produced from petroleum-based naphtha. As a method for producing aromatic hydrocarbons such as benzene from lower hydrocarbons, especially methane, molybdenum supported on synthetic zeolite ZSM-5 is known as A method in whic...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C15/06C07C15/24C07C2/84C07B61/00B01J29/44B01J29/48B01J37/02
CPCY02P20/52
Inventor 市川胜小岛绫一菊池聪
Owner 市川 胜
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