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Catalyst for ammoxidation preparation of 2,4-dichlorobenzonitrile

A technology for the conversion rate of dichlorobenzonitrile and dichlorotoluene is applied in the preparation of hydrocarbon ammoxidation, physical/chemical process catalysts, organic chemistry, etc., and can solve the problems of poor wear resistance of catalysts, high production costs, and fluidization of the reaction. Poor quality and other problems, to achieve the effect of reducing the formation of bubbles, improving the quality of fluidization, and reducing production costs

Active Publication Date: 2014-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the previous production technology, the catalyst has poor wear resistance and short life; or because the catalyst particles used are large and the reaction fluidization quality is poor, the yield is low and the production cost is high.

Method used

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  • Catalyst for ammoxidation preparation of 2,4-dichlorobenzonitrile
  • Catalyst for ammoxidation preparation of 2,4-dichlorobenzonitrile
  • Catalyst for ammoxidation preparation of 2,4-dichlorobenzonitrile

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Catalyst preparation:

[0037] 201 g V 2 O 5 Add 440 ml of water and 420 g of oxalic acid to a solution at a temperature of 80-90° C., fully stir, and react to obtain a vanadium oxalate solution.

[0038] 40% (weight) SiO 2 1250 grams of silica sol was slowly added to the above solution under stirring, and then 798 grams of Cr(NO 3 ) 3 ·9H 2 A solution of O and 300 ml of water and 39.2 g (NH 4 ) 6 Mo 7 O 24 ·4H 2 A solution composed of O and 50 ml of water, 0.11 mol of phosphoric acid solution, and finally 9.4 g of NaNO 3 And 20 ml of water, then add 113.7 g of 30% (weight) TiCl 3 The hydrochloric acid solution is stirred and mixed, heated and evaporated to a solid content of 42% by weight to obtain a viscous slurry.

[0039] The above slurry is sprayed into shape, the gas inlet temperature of the atomizer is 250°C, the outlet temperature is 130°C, the formed catalyst is dried at 160°C for 12 hours, and calcined at 550°C for 8 hours to obtain the catalyst composition: V 1.0 Cr ...

Embodiment 2～5

[0046] The catalyst was prepared and evaluated according to the same operating conditions and process as in Example 1, except that the catalyst composition was changed and its performance examples are as follows.

[0047]

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Abstract

The invention relates to a fluidized bed catalyst for the ammoxidation synthesis of 2,4-dichlorobenzonitrile to mainly solve a problem that the yield is obviously decreased because a phenomenon that a reaction fluidization quality is bad caused by large catalyst particles used in present production technologies is amplified because of industrial production. The catalyst is a composition having the following chemical formula, by element atom ratio, V1.0CraAbBcCdOx, wherein A is selected from Li, Na, K, Rb, Cs or a mixture thereof; B is selected from Mg, Ca, Ba, W, Ti, Mo, Mn, Fe, Co, Ni, Sn or a mixture thereof; and C is selected from B, P or a mixture thereof. Above technical scheme for preparing the spherical catalyst with the diameter of 20-100mum well solves the problem and can be used for the industrial production of the ammoxidation synthesis of the 2,4-dichlorobenzonitrile.

Description

Technical field [0001] The invention relates to a catalyst for preparing 2,4-dichlorobenzonitrile by ammoxidation. Background technique [0002] 2,4-Dichlorobenzonitrile (2,4-DCN for short) is a fine chemical intermediate with a wide range of uses; 2,4-difluorobenzonitrile, 2,4-DCN synthesized by fluorination, hydrolysis and other reactions -Dichlorobenzoic acid, etc. are important organic intermediates and can be widely used in industries such as medicine, pesticides, pigments, dyes and photosensitive materials. [0003] In the past synthesis technology of 2,4-dichlorobenzonitrile, European patent technology EP441004 is a chemical synthesis method, which is obtained from the reaction of raw materials α, α, α, -2,4-pentachlorotoluene and ammonia; Japan Patent Hei 01-96163 reported that 2,4-dichlorobenzoyl chloride was used as a raw material to react to generate the corresponding carboxylic acid, which was then prepared by reacting with urea. These chemical synthesis methods have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/199C07C255/50C07C253/28
Inventor 顾龙勤陈亮
Owner CHINA PETROLEUM & CHEM CORP