Preparation of tephthalyl intrile

A technology of terephthalonitrile and p-xylene, applied in the field of ammoxidation of p-xylene to prepare terephthalonitrile, which can solve the reactor engineering amplification effect, high yield of terephthalonitrile, and reactor engineering amplification and other problems, to achieve good reaction stability, improve reaction selectivity, and enhance the effect of oxygen adsorption capacity

Inactive Publication Date: 2004-04-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the catalyst used in the prior art is often suitable for fixed bed operation, the reactor has the problem of engineering amplification effect, and the problem of low yield of the targ

Method used

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  • Preparation of tephthalyl intrile
  • Preparation of tephthalyl intrile
  • Preparation of tephthalyl intrile

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0046] [Example 1]

[0047] Catalyst preparation:

[0048] 224 g V 2 O 5 Add 490 ml of water and 468 g of oxalic acid to a solution at a temperature of 80-90° C., stir thoroughly, and react to obtain a vanadium oxalate solution.

[0049] Set the concentration to 40% SiO 2 1250 grams of silica sol was slowly added to the above solution under stirring, and then 935 grams of Cr(NO 3 ) 3 ·9H 2 A solution of O and 300 ml of water, 76.3 g of H 3 BO 3 And 560 ml of water and 28.4 g of 85% H 3 PO 4 And 50 ml of water, then add 190 g of 30% (weight) TiCl 3 Hydrochloric acid solution, and containing 12.5 grams of KNO 3 And 88 grams of Mn(NO 3 ) 2 Stir 300 grams of the aqueous solution, heat and evaporate to a solid content of 40% (weight) to obtain a viscous slurry.

[0050] The catalyst formed by spray drying the slurry was dried at 120°C for 12 hours and calcined at 650°C for 5 hours to obtain catalyst composition V 1.00 Cr 0.95 Ti 0.15 B 0.50 P 0.10 Mn 0.2 K 0.05 / SiO 2 , The catalyst main...

Example

[0057] [Examples 2~4]

[0058] Using the same catalyst preparation method and evaluation conditions as in Example 1 above, a catalyst was prepared by changing the composition of the catalyst. The evaluation results are shown in Table 1.

[0059] Example

Example Embodiment

[0060] [Example 5]

[0061] The catalyst was prepared according to the steps of Example 1, and the evaluation conditions were changed as follows:

[0062] Paraxylene: NH 3 : Air = 1:5:50 (mole), catalyst weight load (WWH) 0.10 hours -1 , The reaction temperature is 430℃, the reaction pressure is 0.01MPa, and the reaction results are as follows:

[0063] Conversion rate of p-xylene 98.4%

[0064] Selectivity to terephthalonitrile 91.7%

[0065] The yield of terephthalonitrile 90.2%

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Abstract

A process for preparing P-phenyldimethyl nitrile from P-xylene, ammonia gas and o2 features that its catalyst has the formula: V1.0CraTibAcBdCeOx, where A is chosen from P, B, Bi, Sb and As, B is chosen from alkal metal and alkali-earth metal, and C is chosen from Mn, Ni, Co, Pb, Fe, Mo, W and RE. Its advantage is high output rate of target product.

Description

technical field [0001] The invention relates to a method for preparing terephthalonitrile, in particular to a method for preparing terephthalonitrile by ammoxidation of p-xylene. Background technique [0002] Due to the chemical activity of the aromatic cyano group, a series of fine chemical products can be synthesized through hydrolysis, hydrogenation, addition or polycondensation reactions, which are important raw materials for the manufacture of pesticides, medicines, dyes, spices, resins, etc. [0003] The simplest and most economical method for preparing aromatic nitriles is the direct ammoxidation process of aromatic hydrocarbons developed and matured in the past 30 years. Because of its short process flow, simple operation, good product quality and high yield, it has developed rapidly in recent years. Its core technology is the catalyst. [0004] In the aromatic hydrocarbon ammoxidation catalytic reaction process, vanadium-based catalyst i...

Claims

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Application Information

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IPC IPC(8): C07C253/28C07C255/51
Inventor 陈金华顾龙勤施惠肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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