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Preparation of 3-cyanopyridine

A technology of cyanopyridine and picoline, which is applied in the field of preparing 3-cyanopyridine, can solve problems such as the actual level of difficult fluidized bed catalysts, achieve good reaction stability, improve reaction selectivity, enhance oxygen adsorption capacity and Effect

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

AI Technical Summary

Problems solved by technology

Generally speaking, the fixed bed inspection results show that the yield of aromatic nitrile is 3-5% higher than that of the fluidized bed, so it is difficult for the above-mentioned catalysts to truly represent the actual level of the fluidized bed catalyst

Method used

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  • Preparation of 3-cyanopyridine
  • Preparation of 3-cyanopyridine
  • Preparation of 3-cyanopyridine

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] Set the concentration weight percent to 40% SiO 2 1250 grams of silica sol are slowly added in the above-mentioned solution under stirring, then add respectively by 886 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 85 g of 85% H 3 PO 4 and 50 ml of water, and finally add 24.9 g of KNO 3 20 milliliters of the aqueous solution, 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 Cr 0.90 B 0.50 P 0.30 K 0.10 / SiO 2 , The catalyst main loading weight ratio is 50 / 50...

Embodiment 2～4

[0059] Using the same catalyst preparation method and evaluation conditions as in Example 1, the composition was changed to prepare the catalyst, and the evaluation results are listed in Table 1.

[0060] Example

Embodiment 5

[0062] Prepare catalyst with catalyst composition and preparation method of embodiment 1, change evaluation condition to be: 3-picoline: NH 3 : Air = 1:6:45 (mol), catalyst weight loading (WWH) 0.10 hours -1 , the reaction temperature is 425°C, and the reaction pressure is 0.01MPa.

[0063] The result of the reaction is:

[0064] 3-picoline conversion 99.6%

[0065] 3-cyanopyridine selectivity 88.2%

[0066] 3-cyanopyridine yield 87.9%

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Abstract

A process for preparing 3-cyanopyridine from 3-methylpyridine, ammonia gas and O2 features its catalyst has the formula: V1.0CraAbBcCdOx, where A is chosen from P, B, Bi, Sb and As, B is chosen from alkali metal and alkali-earth metal, and C is chosen from Mn, Ti, Ni, Co, Pb, Fe, Mo, W and RE. Its advantage is high output rate of target product.

Description

technical field [0001] The present invention relates to a method for preparing 3-cyanopyridine, in particular to a method for preparing 3-cyanopyridine from 3-picoline. Background technique [0002] Due to the chemical activity of the aromatic nitrile 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. Nicotinic acid and nicotinamide, which are widely used produced by 3-cyanopyridine, are indispensable B vitamin nutrients for human and other animals, and are used as feed, food additives and synthetic pharmaceutical intermediates. [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 oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/85
Inventor 陈金华顾龙勤金文清沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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