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Method for preparing cyanobenzene

A technology of benzonitrile and toluene, which is applied in the field of preparing benzonitrile, can solve the problems of poor selectivity and low catalyst yield, and achieve the effects of reducing unit consumption, increasing reaction yield, and enhancing wear resistance

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by this invention is to overcome the low yield of catalyst in the production of product benzonitrile in the prior art, the problem of poor selectivity, and to provide a new method for preparing benzonitrile

Method used

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  • Method for preparing cyanobenzene
  • Method for preparing cyanobenzene
  • Method for preparing cyanobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Catalyst preparation:

[0053] 201 g V 2 o 5 Add it into a solution at a temperature of 80-90° C. consisting of 440 milliliters of water and 420 grams of oxalic acid, stir well, and react to obtain a vanadium oxalate solution.

[0054] 40% (weight) SiO 2 1250 grams of silica sol was slowly added to the above solution under stirring, and then 505 grams of antimony ammonium oxalate [2(NH 4 ) 3 Sb(C 2 o 4 ) 3 2H 2 O] and 300 milliliters of water solution, 68.6 grams of H 3 BO 3 and 560 ml of water and 117.6 g (NH 4 ) 6 Mo 7 o 24 4H 2 A solution consisting of O and 50 ml of water, 0.11 molar phosphoric acid solution, and finally 9.4 g of NaNO 3 And the solution that 20 milliliters of water forms, stirs and mixes, and heating and evaporating to solid content is 42% (weight), obtains viscous slurry.

[0055] The above slurry is sprayed into shape, the gas inlet temperature of the sprayer is 250°C, the outlet temperature is 130°C, the formed catalyst is dried ...

Embodiment 2

[0069] Use the same catalyzer and catalyst amount of embodiment 1, same reaction pressure, reaction load and reaction raw material ratio, change temperature of reaction, evaluate reaction process condition in embodiment 1, its evaluation result is listed in following table 2.

[0070] Table 2 Effect of temperature on reaction

[0071]

Embodiment 3

[0073] Use the same catalyzer and catalyst amount of embodiment 1, same reaction temperature, reaction load and reaction raw material ratio, change reaction pressure, evaluate reaction process condition in embodiment 1, its evaluation result is listed in following table 3.

[0074] Table 3 Effect of pressure on reaction

[0075]

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Abstract

The invention relates a method for preparing cyanobenzene by ammoxidation, which mainly solves the problem that in the prior art, a cyanobenzene product is low in yield and poor in selectivity. With the adoption of the method, a composition with a chemical formula V1.0SbAbBcCdOx based on the atomic ratio is adopted, wherein A is at least one selected from lithium, sodium, potassium, rubidium and caesium or compositions thereof, B is at least one selected from magnesium, calcium, barium, chromium, tungsten, molybdenum, manganese, ferrum, cobalt, nickel and stannum or compositions thereof, and C is at least one selected from boron and phosphorus or compositions thereof. The specific surface area of a catalyst is 12-45 m<2> / g, the problem is better solved, and the method can be applied to industrialized production of preparing cyanobenzene by ammoxidation.

Description

technical field [0001] The invention relates to a method for preparing benzonitrile. Background technique [0002] Benzonitrile is an important organic raw material for organic synthesis. It is mainly used as a raw material for benzomelamine with multiple uses. It can also be used as a high-boiling solvent for paints, printing inks and resins. Oxygen agent, dye carrier, fuel additive, pesticide, veterinary drug and other intermediates. [0003] The simplest and most economical method for producing benzonitrile is to obtain it by gas-phase ammoxidation of toluene under the action of a catalyst, and its core technology is the catalyst. [0004] In 1964, Nippon Shokubai Chemical Co., Ltd. was the first to produce benzonitrile by direct gas-phase oxidation of toluene in the presence of ammonia, which changed the history of producing benzonitrile by liquid-phase oxidation of toluene, which was then reacted with ammonia. Since then, the production of benzonitrile has become more...

Claims

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Application Information

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IPC IPC(8): C07C255/50C07C253/28B01J27/199B01J23/28B01J27/198
Inventor 杨为民顾龙勤陈亮曾炜刘师前
Owner CHINA PETROLEUM & CHEM CORP
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