Method for preparing cyanobenzene

A technology of benzonitrile and toluene, applied in the field of preparation of benzonitrile, can solve the problems of reactor engineering amplification effect, high production cost of benzonitrile, low yield of benzonitrile, etc., reduce the cost of three wastes treatment, reduce unit Consumption, improve the effect of reaction yield

Inactive Publication Date: 2011-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the high production cost of benzonitrile in the past, or the low yield of target product benzonitrile, or the amplification effect of reactor engineering, or the serious pollution of three wastes in the production process, and provide a new The 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

[0047] Catalyst preparation:

[0048] 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.

[0049] 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 A solution composed of 20 ml of water was stirred and mixed, heated and evaporated to a solid content of 42% by weight to obtain a thick slurry.

[0050] 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 at 130°C for...

Embodiment 2

[0058] 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 1.

[0059] The influence of table 1 temperature on reaction

[0060]

Embodiment 3

[0062] Use the same catalyzer and catalyst amount of embodiment 1, same temperature of reaction, 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 2.

[0063] Table 2 Effect of pressure on reaction

[0064]

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Abstract

The invention relates to a method for preparing cyanobenzene through ammoxidation, which mainly solves the problems that in the prior art, the cyanobenzene production cost is high, or the target product-cyanobenzene is low in yield, or the engineering enlargement effect of a reactor exists, or pollution of three wastes during production process is serious. The method adopts the technical scheme comprising the steps of taking toluene, ammonia gas and air as raw materials in a weight ratio of 1:(2-10):(2-10) on the conditions that the reaction temperature is 300-500 DEG C, the reaction pressure is 0.01-0.1Mpa and the catalyst (WWH) is 0.03-0.1 hour <1>, and conducting contact reaction on the raw materials and a fluid catalyst, thus producing cyanobenzene. The catalyst is a composite with a chemical formula in an atom ratio as follows: V1.0SbaAbBcCdOx, wherein the A is selected from at least one of lithium, sodium, potassium, rubidium, caesium or compositions thereof; the B is selected from at least one of magnesium, calcium, barium, chromium, tungsten, molybdenum, manganese, ferrum, cobalt, nickel, tin or compositions thereof; and the C is selected from at least one of boron, phosphorus or compositions thereof; therefore, the problems in the prior art are better solved, and the cyanobenzene can be used for industrial production.

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