Method for improving the selectivity and reaction stability of arene prepared in methanol aromatization manner

An aromatization and selective technology, which is used in the production of hydrocarbons from oxygen-containing organic compounds, organic chemistry, and bulk chemical production, etc., can solve the problem of catalyst stability, unresolved industrial production, and insufficient aromatics selectivity. problem, to achieve the effects of good reaction stability, inhibition of inactivation, and increased BTX yield

Inactive Publication Date: 2013-09-11
TONGJI UNIV
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Problems solved by technology

Generally speaking, the selectivity of aromatics produced by methanol aromatization is not high enough...

Method used

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  • Method for improving the selectivity and reaction stability of arene prepared in methanol aromatization manner

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: firstly load an appropriate amount of glass beads at the bottom of the reaction tube bed of a miniature fixed-bed catalytic reactor with an internal diameter of 1.5 cm, spread a thin layer of quartz wool on the glass beads, and then add 3.0 to 5.0 g of cylindrical HZSM The -5 molecular sieve catalyst is loaded into the reaction tube, and the upper layer is filled with an appropriate amount of glass beads, and then the nitrogen flow rate is adjusted to nitrogen / methanol = 2.0 (mol / mol) to ensure that the gas flow evenly flows through the catalyst bed and keep the pressure of the reaction medium at 3.0MPa; Program temperature rise to 500°C in 100 minutes, cool down to 450°C after activation for 1 hour, and feed methanol with a metering pump to keep the mass space velocity of methanol at WHSV=2.5h -1 , the reaction effluent took the upper layer of organic matter as a product sample, after weighing and gas chromatography analysis, the total yield of aromatics a...

Embodiment 2

[0027] Embodiment 2: earlier the reaction tube bed bottom of the miniature fixed-bed catalytic reactor of internal diameter 1.5cm is loaded with an appropriate amount of glass beads, spreads a thin layer of quartz wool on the glass beads, and then 3.0 ~ 5.0g cylindrical Mn The modified HZSM-5 molecular sieve is loaded into the reaction tube as a catalyst, and an appropriate amount of glass beads is filled in the upper layer, and then the flow rate of carbon dioxide is adjusted to carbon dioxide / methanol = 2.0 (mol / mol) to ensure that the gas flow flows evenly through the catalyst bed and maintain the pressure of the reaction medium It is 3.0MPa; after 100 minutes, the temperature is programmed to rise to 500°C, after activation for 1h, the temperature is lowered to 450°C, and methanol is introduced with a metering pump to keep the methanol mass space velocity at WHSV=2.5h -1 , the reaction effluent took the upper layer of organic matter as a product sample, after weighing and g...

Embodiment 3

[0028] Example 3: The difference between this example and Example 2 is that Zr-modified HZSM-5 molecular sieve is used as a catalyst, carbon dioxide / methanol is kept at 0.6 (mol / mol), and other reaction conditions are the same as in Example 2.

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Abstract

The invention relates to a method for improving the selectivity and reaction stability of an arene product prepared in a methanol aromatization manner, and is used for preparing the arene in the methanol aromatization manner through the catalysis of a molecular sieve under the action of a carbon dioxide reaction medium. The method comprises the following steps: under the action of the carbon dioxide medium, by taking methanol as a raw material, preparing the arene in the methanol aromatization manner through a molecular sieve based catalyst containing a metal additive under the conditions that the reaction temperature ranges from 340 to 540 DEG C, the methanol reaction airspeed is maintained for 0.1 to 5.0 hours, the reaction pressure ranges from 0.1 to 5.0MPa and the molar ratio of the carbon dioxide to the methanol is 0.5-5.0 (mol/mol). According to the method, a large quantity of excess greenhouse gases, namely the carbon dioxide, serve as the reaction medium; the molecular sieve containing the metal additive serves as the catalyst, so that the selectivity and reaction stability of the arene in a methanol aromatization product are improved effectively. Thus, the method meets the requirement of an industrial application basically.

Description

technical field [0001] The invention relates to a method for improving the selectivity and reaction stability of methanol aromatization to prepare aromatics. Background technique [0002] As the most basic organic chemical raw material, aromatic hydrocarbons are widely used in the fields of medicine, pesticide, dyestuff, organic material synthesis and basic chemical industry. At present, aromatics are mainly derived from the petroleum refining process, and my country's oil reserves are seriously insufficient, and with the rapid depletion of global oil resources, it is becoming increasingly important to find new alternative synthetic routes for aromatics. my country is rich in coal resources, and the process of producing methanol through coal chemical industry is quite mature, and my country's methanol production is already in surplus. In recent years, in addition to the production of olefins and gasoline from methanol, the direct aromatization of methanol has been considere...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C15/08C07C1/20
CPCY02P20/52
Inventor 朱志荣李军辉童锴
Owner TONGJI UNIV
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