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Catalyst used for preparing maleic anhydride from furfuraldehyde through catalytic oxidation and preparation method thereof

A catalytic oxidation and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve problems such as poor catalyst stability

Active Publication Date: 2010-08-04
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stability of the catalyst is poor, and there is no follow-up report
Recent reports also include catalysts studied by Wang Shaomang et al. 2 o 5 -MoO 3 As the main catalyst, using strip-shaped alumina as the carrier, the highest yield is only 50%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 22.79 grams of oxalic acid with 25 grams of deionized water, add 18.99 grams of vanadium pentoxide, and heat and stir. According to the atomic ratio of P / V=1:0.7, 22.57 g of 85% phosphoric acid was added dropwise to obtain a blue-green solution. Add 0.09 g of iron nitrate and 0.76 g of nickel nitrate. Add 42 grams of nano-titanium dioxide to the solution, ultrasonically vibrate, and stir evenly. Add 140 grams of pre-dried silica balls with a diameter of 6 mm, and stir until dry under heating to obtain blue-green spheres. The air atmosphere was heated to 120° C. and dried for 12 hours to obtain a catalyst precursor. Activate at 380°C for 12 hours to obtain a fresh catalyst. Specific surface area 210.43m 2 / g.

[0022] Take 120 grams of fresh catalyst and place it in a fixed-bed reactor with an inner diameter of 30 mm to evaluate the catalytic performance. The reaction temperature is 360°C and the space velocity is 1800h -1 , reacted under the reaction con...

Embodiment 2

[0024] Dissolve 35.12 grams of oxalic acid with 36 grams of deionized water, add 23.41 grams of ammonium metavanadate, and heat and stir. According to the atomic ratio of P / V=1:0.7, 22.57 grams of 85% phosphoric acid was added dropwise. A blue-green solution was obtained. Add 1.26 grams of iron nitrate and 2.52 grams of nickel nitrate. Add 35 grams of nano-titanium dioxide to the solution, ultrasonically vibrate, and stir evenly. Add 150 grams of pre-dried silica balls with a diameter of 6 mm, and stir until dry under heating to obtain blue-green spheres. The air atmosphere was heated to 120° C. and dried for 12 hours to obtain a catalyst precursor. Activate at 420°C for 48 hours to obtain a fresh catalyst. Specific surface area 130.12m 2 / g.

[0025] Take 80 grams of fresh catalyst and place it in a fixed-bed reactor with an inner diameter of 30 mm to evaluate the catalytic performance. The reaction temperature is 380°C, and the space velocity is 1800h -1 , react unde...

Embodiment 3

[0027] Dissolve 15.26 grams of oxalic acid in 16 grams of deionized water, add 12.72 grams of vanadium pentoxide, and heat and stir. According to the atomic ratio of P / V=1:0.8, 17.28 grams of 85% phosphoric acid was added dropwise. A blue-green solution was obtained. Add 0.08 g of iron nitrate and 0.91 g of nickel nitrate. Add 22 grams of nano-titanium dioxide to the solution, ultrasonically vibrate, and stir evenly. Add 145 grams of pre-dried silica balls with a diameter of 9 mm, and stir until dry under heating to obtain blue-green spheres. The air atmosphere was heated to 120° C. and dried for 12 hours to obtain a catalyst precursor. Activate at 420°C for 24 hours to obtain a fresh catalyst. Specific surface area 186.54m 2 / g.

[0028] Take 100 grams of fresh catalyst and place it in a fixed-bed reactor with an inner diameter of 30 mm to evaluate the catalytic performance. The reaction temperature is 390°C and the space velocity is 2200h -1 , reacted under the react...

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Abstract

The invention relates to a catalyst used for preparing maleic anhydride from furfuraldehyde through catalytic oxidation, which is prepared from vanadium pentoxide, phosphoric acid, ferric salt, nickel salt and nanometer titanium dioxide through mixing and reaction, and spherical silicon dioxide is used as carriers. The catalyst is prepared according to the following steps: firstly, preparing oxalic acid into a solution with the concentration between 45 and 50 percent; adding a certain amount of vanadium pentoxide; then, slowly adding a phosphoric acid solution with the concentration of 85 percent; adding a certain amount of ferric nitrate and nickel nitrate; adding nanometer titanium dioxide according to the proportion that the nanometer titanium dioxide accounts for 5 to 50 percent of the weight of the carriers, and carrying out ultrasonic concussion; adding predried silicon dioxide spheres according to the proportion that the vanadium pentoxide accounts for 5 to 30 percent of the weight of the carriers; uniformly stirring materials; raising the temperature of the spheres to 120 DEG C in air atmosphere to be dried to obtain precursors of the load type catalyst of the invention; and activating the precursors of the load type catalyst in the air at 380 to 460 DEG C to obtain finished products of the catalyst. The catalyst is used as the catalyst of the reaction for preparing maleic anhydride from furfuraldehyde through catalytic oxidation, the specific surface area is between 110 and 230 m<2> / g, the per pass conversion reaches 80 to 99 percent, and the yield of the maleic anhydride reaches 60 to 90 percent.

Description

technical field [0001] The invention relates to a catalyst and a synthesis and preparation method, in particular to a catalyst and a preparation method with high conversion rate and relatively high selectivity for preparing maleic anhydride by catalytic oxidation of furfural. technical background [0002] Maleic anhydride, referred to as maleic anhydride, also known as maleic anhydride, is an important organic chemical raw material and the third largest anhydride in the world after phthalic anhydride and acetic anhydride. It is widely used in petrochemical, food processing, and pharmaceutical industries. , Building materials and other industries. Specifically used in the manufacture of unsaturated polyester resins, alkyd resins, maleic acid, fumaric acid, and pesticides, coatings, FRP, surfactants, etc. With the development of industry, the scope of application of maleic anhydride is still expanding, and the prospect is broad. [0003] At present, the production processes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198C07D307/60
Inventor 冷一欣伊春芮新生
Owner 溧阳常大技术转移中心有限公司