A kind of method for preparing acrylonitrile by continuous oxidative dehydrogenation

Abstract

The invention provides a method for preparing acrylonitrile by continuous oxidative dehydrogenation, comprising the following steps: taking propionitrile as a raw material, under the catalytic action of a nickel-based catalyst, an oxidative dehydrogenation reaction occurs to obtain acrylonitrile; the nickel-based catalyst Composed of Ni, Co, Mo and Zr. According to the method for preparing acrylonitrile by continuous oxidative dehydrogenation provided by the present invention, the products include only unreacted propionitrile, product acrylonitrile and water, and the reaction product is separated to obtain propionitrile and acrylonitrile, and the propionitrile can be reused. The process route is simple, clean and pollution-free, the subsequent separation process is short, there is no corrosion to equipment, and the yield is high, which has great industrial application value. In addition, propionitrile is generally only used as a solvent or a pharmaceutical intermediate, with few uses and a small market capacity, while acrylonitrile has a wide range of uses. After converting propionitrile into acrylonitrile, the market capacity of propionitrile is greatly increased.

Description

technical field

[0001] The invention relates to the technical field of organic synthesis, in particular to a method for preparing acrylonitrile through continuous oxidative dehydrogenation. Background technique

[0002] Acrylonitrile is an important monomer for synthetic fibers, synthetic rubber and synthetic resins. The polyacrylonitrile fiber made from acrylonitrile, that is, acrylic fiber, has properties very similar to wool, so it is also called synthetic wool. Acrylonitrile and butadiene can be copolymerized to produce nitrile rubber, which has good oil resistance, cold resistance, abrasion resistance, and electrical insulation properties, and its performance is relatively stable under the action of most chemical solvents, sunlight and heat. ABS resin produced by copolymerization of acrylonitrile, butadiene and styrene has the advantages of light weight, cold resistance and good impact resistance. Acrylamide, acrylic acid and their esters can be produced by hydrolysis...

Examples

Embodiment 1

[0064] Weigh 30.00g of nickel nitrate hexahydrate and add it to 80mL of cobalt nitrate hexahydrate solution with a concentration of 0.5mol / L, stir to dissolve it, then weigh 10.00g of ammonium molybdate, dissolve it in the above solution, and then add 2.5mol Add / L NaOH solution to the above solution, adjust the pH to 7, stir for 30min, then add 7.5g of zirconium hydroxide, and continue stirring for 1.0h. Then the mixed solution was transferred into a polytetrafluoroethylene reactor, and the reactor was placed in a blast drying oven at 160° C. for 12 hours. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst shaping machine.

Embodiment 2

[0066] Weigh 48.40g nickel nitrate hexahydrate and add it to 80mL of cobalt nitrate hexahydrate solution with a concentration of 0.5mol / L, stir to dissolve it, then weigh 14.85g ammonium molybdate, dissolve it in the above solution, and then add 2.5mol Add / L NaOH solution to the above solution, adjust the pH to 7, stir for 30min, then add 11.38g of zirconium hydroxide, and continue stirring for 1.0h. Then the mixed solution was transferred into a polytetrafluoroethylene reactor, and the reactor was placed in a blast drying oven at 160° C. for 12 hours. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst molding machine.

Embodiment 3

[0068] Weigh 52.85 nickel nitrate hexahydrate and add it to 80 mL of cobalt nitrate hexahydrate solution with a concentration of 0.5 mol / L, stir to dissolve it, then weigh 14.85 and dissolve it in the above solution, then add 2.5 mol / L NaOH solution to In the above solution, adjust the pH to 7, stir for 30 min, then add 7.58 g of zirconium hydroxide, and continue stirring for 1.0 h. Then transfer the mixed solution into the polytetrafluoroethylene reactor, and put the reactor into Constant 12h in the blast drying oven. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst shaping machine.

technical field

[0001] The invention relates to the technical field of organic synthesis, in particular to a method for preparing acrylonitrile through continuous oxidative dehydrogenation. Background technique

[0002] Acrylonitrile is an important monomer for synthetic fibers, synthetic rubber and synthetic resins. The polyacrylonitrile fiber made from acrylonitrile, that is, acrylic fiber, has properties very similar to wool, so it is also called synthetic wool. Acrylonitrile and butadiene can be copolymerized to produce nitrile rubber, which has good oil resistance, cold resistance, abrasion resistance, and electrical insulation properties, and its performance is relatively stable under the action of most chemical solvents, sunlight and heat. ABS resin produced by copolymerization of acrylonitrile, butadiene and styrene has the advantages of light weight, cold resistance and good impact resistance. Acrylamide, acrylic acid and their esters can be produced by hydrolysis...

Examples

Embodiment 1

[0064] Weigh 30.00g of nickel nitrate hexahydrate and add it to 80mL of cobalt nitrate hexahydrate solution with a concentration of 0.5mol / L, stir to dissolve it, then weigh 10.00g of ammonium molybdate, dissolve it in the above solution, and then add 2.5mol Add / L NaOH solution to the above solution, adjust the pH to 7, stir for 30min, then add 7.5g of zirconium hydroxide, and continue stirring for 1.0h. Then the mixed solution was transferred into a polytetrafluoroethylene reactor, and the reactor was placed in a blast drying oven at 160° C. for 12 hours. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst shaping machine.

Embodiment 2

[0066] Weigh 48.40g nickel nitrate hexahydrate and add it to 80mL of cobalt nitrate hexahydrate solution with a concentration of 0.5mol / L, stir to dissolve it, then weigh 14.85g ammonium molybdate, dissolve it in the above solution, and then add 2.5mol Add / L NaOH solution to the above solution, adjust the pH to 7, stir for 30min, then add 11.38g of zirconium hydroxide, and continue stirring for 1.0h. Then the mixed solution was transferred into a polytetrafluoroethylene reactor, and the reactor was placed in a blast drying oven at 160° C. for 12 hours. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst molding machine.

Embodiment 3

[0068] Weigh 52.85 nickel nitrate hexahydrate and add it to 80 mL of cobalt nitrate hexahydrate solution with a concentration of 0.5 mol / L, stir to dissolve it, then weigh 14.85 and dissolve it in the above solution, then add 2.5 mol / L NaOH solution to In the above solution, adjust the pH to 7, stir for 30 min, then add 7.58 g of zirconium hydroxide, and continue stirring for 1.0 h. Then transfer the mixed solution into the polytetrafluoroethylene reactor, and put the reactor into Constant 12h in the blast drying oven. Take out the reaction kettle, cool it to room temperature, use a vacuum pump; vacuum filter the filter bottle and filter paper, wash the organic solvent repeatedly with absolute ethanol and then wash it with distilled water, put it in an oven and dry it for 12 hours at 80°C to obtain a catalyst sample, and then A catalyst for a fixed bed is prepared by a catalyst shaping machine.

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