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Method for preparing p-xylene and propylene by utilizing alcohol-ether mixture

A technology of p-xylene and alcohol ether, which is applied in the field of preparation of p-xylene and propylene, can solve the problem of low conversion rate of alcohol ether, achieve the effect of improving the conversion rate of alcohol ether, not easy to fall off, and reducing production costs

Inactive Publication Date: 2015-12-23
南京南亚医疗器械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] P-xylene and propylene are important raw materials in chemical production. At present, a large number of journals, books, patents and other documents have recorded the scheme of using methanol and dimethyl ether to catalyze the production of propylene and xylene. Most of the catalysts used in the catalysis are ZSM -5 and its modified products, but in the disclosed method, one or more of the following defects generally exist: the conversion rate of alcohol ether is lower than 99%, and the proportion of p-xylene in xylene is lower than 90%, In the gas phase, ethylene / ethane (weight ratio, the same below) is less than 8, propylene / propane is less than 8, propylene / ethylene is less than 10

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Put ZSM-5 molecular sieves and ZSM-11 molecular sieves in sodium hydroxide solution for primary impregnation modification, the mass concentration of sodium hydroxide solution is 5%, the temperature of primary impregnation modification is 30-35 °C, and the duration is 2.5 h, then carry out secondary impregnation modification in the still body using an acidic modification solution, the acidic modification solution is a mixed aqueous solution of hydrochloric acid and fluorosilicic acid, and the content of hydrochloric acid in the mixed aqueous solution is 2% (mass concentration, the same below), The content of fluorosilicic acid is 6%, the temperature of the secondary impregnation modification is 110°C, the duration is 2.5h, the pressure in the sealed kettle is controlled to 0.25MPa, and ZSM-5 molecular sieve and ZSM-11 molecular sieve are recovered after the secondary impregnation modification. Washing and drying; mixing ZSM-5 molecular sieve, ZSM-11 molecular sieve and cl...

Embodiment 2

[0017] Put ZSM-5 molecular sieves and ZSM-11 molecular sieves in sodium hydroxide solution for primary impregnation modification, the mass concentration of sodium hydroxide solution is 5%, the temperature of primary impregnation modification is 30-35 °C, and the duration is 2.5 h, then carry out secondary impregnation modification in the still body using an acidic modification solution, the acidic modification solution is a mixed aqueous solution of hydrochloric acid and fluorosilicic acid, and the content of hydrochloric acid in the mixed aqueous solution is 2% (mass concentration, the same below), The content of fluorosilicic acid is 6%, the temperature of the secondary impregnation modification is 110°C, the duration is 2.5h, the pressure in the sealed kettle is controlled to 0.25MPa, and ZSM-5 molecular sieve and ZSM-11 molecular sieve are recovered after the secondary impregnation modification. Washing and drying; mixing ZSM-5 molecular sieve, ZSM-11 molecular sieve and cl...

Embodiment 3

[0021]Put ZSM-5 molecular sieves and ZSM-11 molecular sieves in sodium hydroxide solution for primary impregnation modification, the mass concentration of sodium hydroxide solution is 5%, the temperature of primary impregnation modification is 30-35 °C, and the duration is 2.5 h, then carry out secondary impregnation modification in the still body using an acidic modification solution, the acidic modification solution is a mixed aqueous solution of hydrochloric acid and fluorosilicic acid, and the content of hydrochloric acid in the mixed aqueous solution is 2% (mass concentration, the same below), The content of fluorosilicic acid is 6%, the temperature of the secondary impregnation modification is 110°C, the duration is 2.5h, the pressure in the sealed kettle is controlled to 0.25MPa, and ZSM-5 molecular sieve and ZSM-11 molecular sieve are recovered after the secondary impregnation modification. Washing and drying; mixing ZSM-5 molecular sieve, ZSM-11 molecular sieve and cla...

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Abstract

The invention relates to a method for preparing p-xylene and propylene by utilizing an alcohol-ether mixture. The method is characterized by contacting an alcohol-ether gas mixture with a catalyst in a fluidized bed reactor to carry out catalytic reaction, wherein during catalytic reaction, the temperature in the fluidized bed reactor is controlled to be 490-500 DEG C, the pressure in the fluidized bed reactor is controlled to be 1.5-2.0MPa and the space velocity of the alcohol-ether gas mixture is controlled to be 4-4.5 / h; and the alcohol-ether gas mixture comprises 30 parts of methanol, 65 parts of dimethyl ether, 1.5 parts of water and 2 parts of C6-C12 hydrocarbon by weight. In the scheme, the alcohol-ether gas mixture is catalyzed by the catalyst in the fluidized bed reactor, so that the alcohol-ether gas mixture can be highly selectively converted to propylene and p-xylene; by determining the treated oil and gas phases, the alcohol-ether conversion rate is more than 99%, the proportion of p-xylene in xylene is more than 90%, the ratio of ethylene to ethane in the gas phase is more than 8, the ratio of propylene to propane in the gas phase is more than 8 and the ratio of propylene to ethylene in the gas phase is more than 10.

Description

[0001] The present invention is a divisional application of an invention patent with an application date of December 3, 2014, an application number of 2014107294608, and an invention title of "method for preparing p-xylene and propylene by mixing alcohol ethers". technical field [0002] The invention relates to the field of petrochemical industry, in particular to a method for preparing p-xylene and propylene by using mixed alcohol ethers. Background technique [0003] P-xylene and propylene are important raw materials in chemical production. At present, a large number of journals, books, patents and other documents have recorded the plan of using methanol and dimethyl ether to catalyze the production of propylene and xylene. Most of the catalysts used in the catalysis are ZSM -5 and its modified products, but in the disclosed method, one or more of the following defects generally exist: the conversion rate of alcohol ether is lower than 99%, and the proportion of p-xylene i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C15/08C07C11/06B01J29/80B01J29/40
CPCB01J29/48B01J29/80B01J2229/18C07C1/20C07C2529/48C07C2529/80C07C15/08C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 胡齐放
Owner 南京南亚医疗器械有限公司