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Method for isomerization of 2,5-dichlorotoluene with catalysis of metal Ag modified molecular sieve

A dichlorotoluene and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as dependence on imports, restrict downstream product development and research, and achieve low cost of raw materials, easy reaction control, The effect of mild reaction conditions

Inactive Publication Date: 2017-03-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 2,6-dichlorotoluene has a wide range of uses, but currently there is no domestic manufacturer specializing in the production of 2,6-dichlorotoluene, mainly relying on imports, which seriously restricts the development and research of its downstream products
However, when 2,6-dichlorotoluene is produced by the above two methods, a large amount of by-product 2,5-dichlorotoluene will be accompanied
2,5-dichlorotoluene has less uses and can only be used as a solvent

Method used

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  • Method for isomerization of 2,5-dichlorotoluene with catalysis of metal Ag modified molecular sieve
  • Method for isomerization of 2,5-dichlorotoluene with catalysis of metal Ag modified molecular sieve
  • Method for isomerization of 2,5-dichlorotoluene with catalysis of metal Ag modified molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Changing the type of carrier molecular sieve to be HZSM-5(25) and the amount of loaded metal, it can be seen that different types of catalyst supports and metal loading have a great impact on the isomerization of 2,5-dichlorotoluene catalyzed by the loaded metal type H-type molecular sieve to prepare 2,6- The impact of dichlorotoluene, as shown in Table 1:

[0027] Table 1 The effect of the type of supported metal-type molecular sieve carrier and the amount of loaded metal on the conversion rate of raw materials and product selectivity

[0028]

[0029] Note: PhCl is chlorobenzene, DCB is dichlorobenzene, 2,6-DCT is 2,6-dichlorotoluene, 2,4-DCT is 2,4-dichlorotoluene, Xylene dichloride is dichloroxylene, 3 , 4-DCT is 3,4-dichlorotoluene, 2,3-DCT is 2,3-dichlorotoluene.

[0030] When the catalyst carrier is Hβ(25), the amount of loaded metal is 1%, the reaction temperature is 350°C, and the volume space velocity of the raw material solution is 0.4hr -1 , the convers...

Embodiment 2

[0034] The process of isomerization of 2,5-dichlorotoluene adopts the same method as in Example 1, but the volume space velocity is 0.2hr when changing the raw material liquid -1 、0.6hr -1 , it can be seen that the volumetric space velocity of the raw material liquid has an influence on the H-type molecular sieve catalyzed isomerization of 2,5-dichlorotoluene to prepare 2,6-dichlorotoluene, as shown in Table 2:

[0035] Table 2 Effect of raw material liquid hourly volume space velocity on raw material conversion and product selectivity

[0036]

[0037] Note: PhCl is chlorobenzene, DCB is dichlorobenzene, 2,6-DCT is 2,6-dichlorotoluene, 2,4-DCT is 2,4-dichlorotoluene, Xylene dichloride is dichloroxylene, 3 , 4-DCT is 3,4-dichlorotoluene, 2,3-DCT is 2,3-dichlorotoluene.

[0038] When the raw material liquid volume space velocity is 0.2hr -1 , the conversion rate of 2,5-dichlorotoluene is 38.01%, the selectivity of 2,6-dichlorotoluene is 20.46%; the volumetric space veloci...

Embodiment 3

[0041]The process of isomerization reaction of 2,5-dichlorotoluene adopts the same method as that of Example 1, but the reaction temperature is changed to 310°C, 330°C, and 370°C. It can be seen that the reaction temperature has a great influence on the catalysis of 2,5-dichlorotoluene by H-type molecular sieve. The impact of the isomerization of chlorotoluene to prepare 2,6-dichlorotoluene is shown in Table 3:

[0042] Table 3 Effect of H-type molecular sieve types on raw material conversion and product selectivity

[0043]

[0044] Note: PhCl is chlorobenzene, DCB is dichlorobenzene, 2,6-DCT is 2,6-dichlorotoluene, 2,4-DCT is 2,4-dichlorotoluene, Xylene dichloride is dichloroxylene, 3 , 4-DCT is 3,4-dichlorotoluene, 2,3-DCT is 2,3-dichlorotoluene.

[0045] When the reaction temperature is 310°C, the conversion rate of 2,5-dichlorotoluene is 12.41%, and the selectivity of 2,6-dichlorotoluene is 0.00%; when the reaction temperature is 330°C, the conversion rate of 2,5-dich...

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Abstract

The invention relates to a method for preparing 2,6-dichlorotoluene by isomerization of 2,5-dichlorotoluene with catalysis of metal Ag modified H molecular sieve, and belongs to the technical field of molecular sieve applications. AgNO3 is dissolved in distilled water, after AgNO3 is completely dissolved, the solution and powdery H type molecular sieve are fully mixed with stirring, the materials are permitted to stand for 4 hours, the materials are dried with an electric furnace and placed at 110 DEG C for 12 hours, and the materials are placed in a muffle furnace at 400 DEC and dried for 2 hours. The modified molecular sieve with metal loaded is tableted, grinded, and sieved, and sieved and modified molecular sieve particles are selected as a catalyst; the catalyst is placed in a constant-temperature area of a fixed bed reactor, and glass beads are filled in an upper end of the catalyst; the raw material 2,5-dichlorotoluene is conveyed to the fixed bed reactor through a constant flow pump at a certain liquid hourly volume space velocity, in the constant-temperature area, after rapid vaporization, the raw material 2,5-dichlorotoluene steam is continuously introduced into a catalyst bed layer through inert gas; finally, water-bath condensation is carried out for collecting products.

Description

technical field [0001] The invention relates to a method for preparing 2,6-dichlorotoluene by catalyzing 2,5-dichlorotoluene isomerization with metal Ag-modified H molecular sieve, which belongs to the technical field of 2,5-dichlorotoluene isomerization and also belongs to molecular sieves Field of application technology. Background technique [0002] 2,6-Dichlorotoluene is an important fine chemical raw material for the manufacture of fungicides, insecticides, herbicides, dyes and pigments, pharmaceuticals and other chemical products. Direct chlorination of 2,6-dichlorotoluene can produce 2,6-dichlorobenzaldehyde, which can be used as a raw material to produce pharmaceutical intermediate 2,6-dichlorobenzaldehyde oxime and dyes for wool fabric dyeing Acid medium bleaching B. 2,6-dichlorotoluene can be produced by ammonia oxidation to 2,6-dichlorobenzonitrile, which is the pesticide herbicide Cao Kele, the herbicide dichonil, and the fluorine-containing urea insecticide o...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/74C07C17/358C07C25/02
CPCB01J29/7415B01J29/44B01J2229/18C07C17/358C07C25/02
Inventor 翟楚殷恒波李继泰
Owner JIANGSU UNIV
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