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Catalyst for preparing para-Phthalonitrile by using ammoxidation method and preparation method and application

A terephthalonitrile and ammoxidation technology, which is used in the preparation of hydrocarbon ammoxidation, catalysts for physical/chemical processes, chemical instruments and methods, etc. Oxides are easy to fall off and other problems, to achieve the effect of good application value, good thermal stability and mechanical strength, and low cost

Active Publication Date: 2019-09-13
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the supported catalysts use fixed bed or coarse particle baffle fluidized bed reactor technology, which has poor reaction safety factor, difficulty in removing heat, and low product yield; and the composite metal oxide in the supported catalyst is mainly attached to the On the surface of silica gel, the force between the metal oxide and the carrier is weak. In the fluidized bed reactor, the catalyst microspheres collide and rub against each other, and the metal oxide is easy to fall off. In addition, some components in the composite metal oxide volatilize under long-term high temperature. , leading to the loss of active components of the catalyst and the change of the ratio, to a certain extent, it will lead to a decrease in catalyst activity and affect the service life of the catalyst

Method used

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  • Catalyst for preparing para-Phthalonitrile by using ammoxidation method and preparation method and application
  • Catalyst for preparing para-Phthalonitrile by using ammoxidation method and preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 41.12 g H 2 C 2 o 4 2H 2 O was dissolved in 150 mL of distilled water at 80°C, and 7.61 g of V were added 2 o 5 , 6.69 CrO 3 , 16.25 grams (NH 4 ) 6 Mo 7 o 24 4H 2 O, 6.35 g TiCl 4 , 1.56 g H 3 BO 3 , 1.36 g KSbC 4 h 4 o 7. 1 / 2H 2 O and 0.96 g of 85% H 3 PO 4 After forming a uniform solution, slowly add 100 mL of 30% silica sol, and then add 8 g of aminohexyltrichlorosilane. After stirring evenly, the catalyst precursor was obtained by high-speed spray and centrifugal drying, dried in a muffle furnace at 110°C, and then gradually raised to 500°C and kept for 6 hours. After natural cooling, set aside. The active composition of the catalyst is: VMo 1.1 Cr 0.8 Ti 0.4 B 0.3 P 0.1 Sb 0.05 K 0.05 o 8.6 .

[0025] 20g of the above-mentioned solid catalysts are packed in a quartz tube fixed-bed reactor with an internal diameter of 30mm, and the molar ratio of the reaction raw materials is: p-xylene:NH 3 :Air=1:5:30, the reaction temperature is 673±...

Embodiment 2～7

[0027] Catalyst formula is different, and reaction condition is with embodiment 1, and result is as follows:

[0028]

[0029] The catalyst of the present invention containing other co-catalysts can be prepared according to the above method, wherein the corresponding precursors can be oxides, salts, acids or bases of other co-catalyst components. During the preparation, the desired catalyst can be obtained by replacing the corresponding precursor substances in proportion with reference to the above-mentioned examples. The catalysts prepared in Examples 2 and 9 of the present invention have been tested in use, and after two years of use, the conversion rate and selectivity have not decreased significantly.

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Abstract

The invention discloses a special catalyst for preparing para-Phthalonitrile by using an ammoxidation method. Silica sol is adopted as a carrier of the special catalyst, the catalyst comprises an active component of an inorganic composite oxide with at least six of vanadium, molybdenum, chromium, boron, titanium, phosphorus, antimony and an alkali metal, the active component of the catalyst is shown in a formula VMoaCrbTicBdPeSbfMgOx, in the formula, x represents the alkali metal, and the alkali metal is sodium, potassium, rubidium or caesium. The invention furthermore discloses a preparationmethod and application of the catalyst. According to the catalyst, groups with lone electron pairs on silicon and inorganic elements are subjected to a Lewis acid-alkali reaction, so that functions ofinorganic oxides with carriers are enhanced; and meanwhile, the inorganic oxides can be uniformly dispersed, the catalyst is small in component loss, high in catalytic activity and good in selectivity, and the service life of the industrial catalyst is prolonged to two years or longer from one year. The catalyst is simple in preparation method, good in thermal stability and high in mechanical strength, and can be applied to fixed bed reactors and fluidized bed reactors.

Description

technical field [0001] The invention relates to a catalyst for preparing terephthalonitrile by an ammoxidation method, a preparation method and an application. It belongs to the technical field of organic chemistry and also belongs to the technical field of organic fine chemicals. Background technique [0002] Terephthalonitrile, also known as terephthalonitrile, is an important aromatic nitrile, and its hydrogenation can prepare p-xylylenediamine, which is an important raw material for polyamide and a good epoxy resin curing agent at present; Tetrachloroterephthalonitrile can be prepared by reacting dinitrile with chlorine gas, which can be used to synthesize herbicide chlorophthalic acid, pyrethroid insecticides and cerebral thrombosis drugs; terephthalonitrile can be hydrolyzed to obtain terephthalic acid, which is widely used For synthetic polyester fibers and polyester resins. Because of its wide range of applications, in recent years, the demand for it in domestic an...

Claims

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Application Information

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IPC IPC(8): B01J27/199C07C255/51C07C253/28
CPCB01J27/199C07C253/28C07C255/51
Inventor 谢光勇李建熊焰
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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