Catalyst for preparing succinic anhydride by hydrogenation of maleic anhydride and preparation method thereof

A succinic anhydride and catalyst technology, which is applied to the supported iron catalyst for catalyzing the hydrogenation of maleic anhydride to produce succinic anhydride and the field of preparation thereof, can solve the problems of high content of nickel as an active component, influence industrialization promotion, harsh process conditions, etc. The effect of low content, easy control of reduction operation and concise preparation method

Active Publication Date: 2017-08-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the disadvantages of high nickel content in the active component, high energy consumption, and high cost.
Chinese patent CN95109162.X "Manufacturing method of succinic anhydride" has set forth a kind of use Raney nickel framework catalyst or platinum group metal catalyst, is 120-150 ℃ at reaction temperature, hydrogen pressure 10-150bar, one-step hydrogenation maleic anhydride produces butyl The method of dianhydride, which is only suitable for batch operation
Although this process provides a continuous production method of succinic anhydride, its reaction pressure is very high, which has special requirements on the strength of the catalyst, the design and material of the reactor, and the active metal content in the catalyst reaches 60wt%. -65wt%, so the cost of the catalyst is high and the process conditions are harsh, which affects its industrialization

Method used

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  • Catalyst for preparing succinic anhydride by hydrogenation of maleic anhydride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The PHTS carrier was roasted in a muffle furnace at 400°C for 5h, and then cooled to room temperature for later use. Weigh a certain amount of ferric sulfate and dissolve in 2×10 -2 mol / L 2.5 generation PAMAM solution, made into iron salt solution, the iron concentration in the solution is 5×10 -2 mol / L; Measure 200ml of the above iron salt solution and immerse it in 20g of the above treated carrier, stir for 50min, then add 300ml of 0.1mol / l sodium borohydride solution dropwise, continue to stir for 60min, centrifuge, and dry at 50℃. Get catalyst A.

Embodiment 2

[0029] The Al-PHTS carrier was roasted in a muffle furnace at 500°C for 5h, and then cooled to room temperature for later use. Weigh a certain amount of ferrous sulfate and dissolve in 2×10 -2 mol / L 2.0 generation PAMAM solution, made into iron salt solution, the iron concentration in the solution is 5.5×10 -2 mol / L; Measure 200ml of the above solution and immerse it in 40g of the above-mentioned treated carrier, stir for 80min, then add 320ml of 0.1mol / l potassium borohydride solution dropwise, continue to stir for 100min, centrifuge, and dry at 70℃ to obtain the catalyst B.

Embodiment 3

[0031] The Al-PHTS carrier was calcined in a muffle furnace at 450°C for 5h, and then cooled to room temperature for later use. Weigh a certain amount of ferrous chloride and dissolve it in 2×10 -2 mol / L 3.0 generation PAMAM solution, made into iron salt solution, the iron concentration in the solution is 10×10 - 2 mol / L; Measure 200ml of the above solution and immerse it in 40g of the above-mentioned treated carrier, stir for 60min, then add 330ml of 0.2mol / l potassium borohydride solution dropwise, continue stirring for 80min, centrifuge, and dry at 40℃ to obtain the catalyst C.

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Abstract

The invention discloses a catalyst for producing succinic anhydride by hydrogenation of maleic anhydride and a preparation method thereof. The catalyst is prepared by adopting dendritic supramolecular polyamide-amine PAMAM dispersion and wet reduction method with a nanometer iron content of 0.1-15wt %, the carrier is a loaded nano-iron catalyst of PHTS or Al-PHTS. The preparation method is as follows: impregnating PHTS or Al-PHTS carrier with an impregnating liquid prepared by supramolecular dendrimer PAMAM and active metal iron salt, and obtaining it after borohydride wet reduction and vacuum drying. The catalyst catalyzes the hydrogenation of maleic anhydride to prepare succinic anhydride, the conversion rate of maleic anhydride is greater than 90.5 percent, and the selectivity of succinic anhydride is greater than 99.0 percent. The catalyst has the advantages of high activity, good selectivity, low cost and environmental friendliness.

Description

Technical field [0001] The invention relates to a supported iron catalyst, in particular to a supported iron catalyst for catalyzing the hydrogenation of maleic anhydride to produce succinic anhydride and a preparation method thereof. Background technique [0002] Succinic anhydride, also known as succinic anhydride, is an important organic synthesis intermediate and fine chemical raw material, widely used in food, surfactants, coatings, medicine, agriculture, plastics and other industrial fields. In recent years, polybutylene succinate (PBS) biodegradable plastics with excellent performance can be synthesized by polycondensation reaction using succinic anhydride and butylene glycol as raw materials. The market prospect of PBS is very broad, which greatly stimulates and drives butylene. Market demand for dianhydride. [0003] At present, the synthesis methods of succinic anhydride mainly include biological fermentation, succinic acid dehydration, and maleic anhydride hydrogenation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J29/76C07D307/60
Inventor 赵永祥贾志奇孙自瑾秦晓琴高春光张因李海涛
Owner SHANXI UNIV
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