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 target product, and a new method for preparing terephthalonitrile is provided
The method is suitable for fluidized bed operation, solves the problem of reactor engineering scale-up, and has the characteristics of high yield of the target product terephthalonitrile

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

Embodiment 1

[0047] Catalyst preparation:

[0048] 224g V 2 o 5 Add it into a solution at a temperature of 80-90° C. consisting of 490 milliliters of water and 468 grams of oxalic acid, stir well, and react to obtain a vanadium oxalate solution.

[0049] The concentration will be 40% SiO 2 1250 grams of silica sol are slowly added in the above-mentioned solution under stirring, then add respectively by 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 milliliters of water, then add 190 grams of 30% (by weight) TiCl 3 Hydrochloric acid solution, and containing 12.5 grams of KNO 3 and 88 g Mn(NO 3 ) 2 300 g of the aqueous solution was stirred, heated and evaporated to a solid content of 40% (weight), to obtain a thick slurry.

[0050] The catalyst formed by spray drying the above slurry was dried at 120°C for 12 hours and calcined at 650°C for 5 hours to obtain catalyst composition V 1.00 C...

Embodiment 2～4

[0058] Using the same catalyst preparation method and evaluation conditions as in Example 1 above, the composition of the catalyst was changed to prepare the catalyst, and the evaluation results are listed in Table 1.

[0059] Example

Embodiment 5

[0061] Prepare catalyst by each step of embodiment 1, change evaluation condition to be:

[0062] p-Xylene: NH 3 : Air = 1:5:50 (mol), catalyst weight loading (WWH) 0.10 hours -1 , the reaction temperature is 430°C, the reaction pressure is 0.01MPa, and the reaction results are as follows:

[0063] p-xylene conversion 98.4%

[0064] Terephthalonitrile selectivity 91.7%

[0065] Terephthalonitrile yield 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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