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Molecular sieve catalyst for synthesizing methanol into durene and its prepn and application

A technique for synthesizing durene and methanol, which is applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, large investment, and restrictions on durene production, and achieves a simple preparation method Ease of operation and high selectivity

Inactive Publication Date: 2003-06-04
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is an important organic chemical raw material. Usually, durene is made of reformed carbon ten as raw material through rectification, enrichment, crystallization, and separation. Since the content of durene in carbon ten aromatics is very low, the entire production process Large investment and high energy consumption, so this method limits the production of durene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) earlier 20 grams of Si / Al (mol) is the hydrogen type ZSM-5 molecular sieve of 20 roasting at 540 ℃ for 3 hours to remove the impurity that it adsorbs;

[0019] (2) Combine 13 grams of molecular sieve with 7 grams of γ-Al 2 o 3 . At the same time, put it into the mortar and mix it, and grind it evenly;

[0020] (3) Add 3% nitric acid solution dropwise to the ground material and knead properly, extrude it into a columnar shape of Φ2 with a manual screw extruder, put it in an oven and dry it at 120°C;

[0021] (4) Then crush strip molecular sieves to 10-40 mesh, put them in a muffle furnace and heat up to 530°C for 5 hours to remove nitric acid and moisture, and take them out when the temperature drops below 60°C;

[0022] (5) Accurately weigh 3.42 grams of 32% hydrochloric acid and put it into a volumetric flask, add deionized water to 30ml and be mixed with a solution of 1mol / L; take by weighing 10 grams of molecular sieves made in step (4) and put it into an Erle...

Embodiment 2

[0026] (1) at first with 20 grams of Si / Al (mol) be the hydrogen type ZSM-5 molecular sieve of 52.5 at 540 ℃ for 3 hours to remove the impurity that it adsorbs;

[0027] (2) Combine 14 grams of molecular sieve with 6 grams of γ-Al 2 o 3 . At the same time, put it into the mortar and mix it, and grind it evenly;

[0028] (3) Add 3% nitric acid solution dropwise to the ground material and knead appropriately, extrude it into a columnar shape of Φ2 with a manual screw extruder, put it in an oven and dry it at 105°C;

[0029] (4) Then crush the strip molecular sieve to 10-40 mesh and put it in a muffle furnace and heat it up to 510°C for 3 hours to roast to remove nitric acid and moisture, and take it out when the temperature drops below 60°C;

[0030] (5) Accurately weigh 10.5 grams of 36% nitric acid and put it into a volumetric flask, add deionized water to 30ml to prepare a 2mol / L solution, shake well; weigh 10 grams of molecular sieve prepared in step (4) and put it into a...

Embodiment 3

[0033] (1) at first 20 grams of Si / Al (mol) is the hydrogen type ZSM-5 molecular sieve of 35.3 roasting at 540 ℃ for 3 hours to remove its adsorbed impurities;

[0034] (2) 14.4 grams of molecular sieves are mixed with 5.6 grams of pseudo-thin water aluminum oxide in a mortar and mixed, evenly ground;

[0035] (3) Add 2% nitric acid solution dropwise to the ground material and knead properly, extrude it into a columnar shape of Φ2 with a manual screw extruder, put it in an oven and dry it at 115°C;

[0036] (4) Then crush strip molecular sieves to 10-40 mesh, put them in a muffle furnace and heat up to 520 ° C for 3 hours to remove nitric acid and moisture, and take them out when the temperature drops below 60 ° C;

[0037] (5) accurately take by weighing 3.0 grams of 98% sulfuric acid and put it into a volumetric flask, add deionized water to 30ml and be mixed with a solution of 1mol / L; take by weighing 10 grams of molecular sieves made by the step (4) and put it into an Erle...

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Abstract

The molecular sieve catalyst for synthesizing methanol into durene is ZSM-5 type with molar Si / Al ratio of 13-50, strong / weak acid ratio of 1.03-1.30, adsorption amount to cyclohexane of 5.95-6.25 wt%, said adsorption amount to n-hexane of 8.95-9.15 wt%. The hydrogen-type molecular sieve, assistant and nitric acid are mixed and kneaded, and the mixture is formed, stoved, crushed, roasted, soakingin acid solution, stoved and roasted to obtain the catalyst. The present invention has the advantages of simple preparation process, high selectivity of the catalyst, and the durene content in the product as high as 20%.

Description

[0001] Field: [0002] The invention belongs to the preparation and application of a catalyst for synthesizing durene molecular sieves, in particular to the preparation and application of a catalyst for synthesizing durene molecular sieves from methanol. Background technique: [0003] Methanol is a rich source of industrial raw materials, and is a C 1 An important part of chemistry, its synthesis and transformation has always been a very active subject. In recent years, with the rapid development of my country's petrochemical industry, in order to improve competitiveness, my country's methanol production is also developing towards large-scale and energy-saving development, and the output continues to increase. At present, the supply of methanol market exceeds the demand, and the new equipment will continue to be built and put into production. Therefore, the development of methanol downstream products is of great significance to the development of the methanol industry (refere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J37/02C07C1/20C07C15/02
CPCY02P20/52
Inventor 胡津仙王俊杰任杰李永旺孙予罕
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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