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Catalyst for preparing epoxy propane by gas phase epoxidation of propane and preparation method

A technology of propylene oxide and catalyst, applied in the field of supported iron catalyst, which can solve the problems of high price and high production cost of titanium silicon molecular sieve

Inactive Publication Date: 2006-10-11
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although H 2 o 2 The epoxidation reaction as an oxidant has the advantages of simple process and environmental friendliness, but H 2 o 2 The price is expensive, and the production cost of titanium-silicon molecular sieve is high, and it is necessary to develop a process that matches the reaction
O 2 The oxidant directly oxidizes propylene to produce propylene oxide and uses O 2 as the oxidizing agent in H 2 The work of producing propylene oxide from propylene oxide under the combined effect of O 2 It is cheap, easy to obtain, and non-polluting, but molecular oxygen is very stable at room temperature, and deep oxidation is prone to occur at high temperatures. At present, the selectivity of propylene oxide does not exceed 50% under this condition; and the active component of the catalyst is relatively expensive. Precious metals, such as platinum, gold, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Take by weighing 0.25gFe(acac) 3 Add 50g of absolute ethanol and stir to dissolve, weigh 5.7g of mesoporous molecular sieve SBA-15 according to the ratio, add it to the above solution, stir at room temperature for 10h, let stand overnight, evaporate to dryness in a water bath at 60°C, dry in a vacuum at 40°C for one day, and grind thoroughly Then roast at 550 °C for 6 h at a heating rate of 1 °C / min; weigh KCl according to the proportion to 0.28 g (K / Si=0.04), add 20 g of deionized water to dissolve, then add the roasted sample, and stir at room temperature for 10 h. Stand overnight, evaporate to dryness in a water bath at 60°C, dry in a vacuum at 40°C for one day, grind thoroughly and roast at 550°C for 6 hours at a heating rate of 1°C / min to obtain 1wt% FeO x / SBA-15-KCl (K / Si=0.04) catalyst, and then sieve the calcined solid powder into shape, and sieve the 30-60 mesh component as the propylene epoxidation reaction catalyst. Mesoporous molecular sieve ...

Embodiment 2

[0047] Embodiment 2: Weigh 1.25 g Fe(acac) 3 Add 50g of absolute ethanol and stir to dissolve, weigh 5.7g of mesoporous molecular sieve SBA-15 according to the ratio, add it to the above solution, stir at room temperature for 10h, let stand overnight, evaporate to dryness in a water bath at 60°C, dry in a vacuum at 40°C for one day, and grind thoroughly Then roast at 550 °C for 6 h at a heating rate of 1 °C / min; weigh 0.22 g of NaCl (Na / Si=0.04) according to the proportion, add 20 g of deionized water to dissolve, then add the roasted sample, and stir at room temperature for 10 h. Stand overnight, evaporate to dryness in a water bath at 60°C, dry in a vacuum at 40°C for one day, grind thoroughly and roast at 550°C for 6 hours at a heating rate of 1°C / min to obtain 5wt% FeO x / SBA-15-NaCl (Na / Si=0.04) catalyst, and then sieve the calcined solid powder into shape, and sieve 30-60 mesh components as the propylene epoxidation catalyst. Mesoporous molecular sieve SBA-15 was prepar...

Embodiment 3

[0050] Embodiment 3: take by weighing Fe(NO 3 ) 3 9H 2 O 0.29g was dissolved by adding 50g of absolute ethanol, then 8.7g of MCM-41 without template removal was added, stirred and reacted in a water bath at 60°C for 3h, and then left at room temperature for 20h. Filter the above mixture, wash it with a large amount of deionized water, and wash away the unexchanged iron ions; vacuum-dry the filter cake at 40°C for one day; fully grind the dried solid and roast it at 550°C for 6h, the heating rate is controlled at 1°C / min. Weigh 0.11g of KCl (K / Si=0.02) according to the proportion, add 20g of deionized water to dissolve, then add the roasted sample, stir at room temperature for 10h, let stand overnight, evaporate to dryness in a water bath at 60°C, and dry in a vacuum at 40°C for one day , after fully grinding, roasting at 550 °C for 6 hours at a heating rate of 1 °C / min to prepare a 1wt% Fe-MCM-41(TIE)-KCl (K / Si=0.02) catalyst, and then sieve the roasted solid powder Shapin...

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PUM

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Abstract

The loaded iron catalyst consists of molecular sieve, metal iron oxide, alkali metal, alkali earth metal and its salt. It has composition of mFeOx / [AI, AII]O.Al2O3.ySiO2-n[MI,MII] or mFeOx / SiO2-n[MI,MII], where, mFeOx / [AI, AII]O.Al2O3.ySiO2 is mocroporous molecular sieve, SiO2 is mesoporous molecular sieve or nano silicon gel containing bulk pores, m is the mass percentage of iron oxide, MI and MII are one-valent and two-valent metal ion, n is the atom ratio between the doping alkali metal or alkali earth metal and silicon in the molecular sieve. Preparing epoxypropane through the gas phase propylene epoxidation with N2O as oxidant can utilize N2O effectively while producing unique side product N2 without pollution. The present invention has propylene converting rate of 1.77 %, epoxypropane selectivity up to 85 %, catalyst capable of being regenerated without performance change.

Description

technical field [0001] The present invention relates to a kind of nitrous oxide (N 2 O) is a supported iron catalyst for the gas-phase epoxidation of oxygen source propylene to propylene oxide. technical background [0002] Propylene oxide (PO) is an important basic organic chemical raw material, and it is the third largest product after polypropylene and acrylonitrile among propylene derivatives. Propylene oxide can produce widely used propylene glycol, which is widely used in food, tobacco and pharmaceutical industries as solvents, lubricants, antifungal agents, etc., as well as in the production of nonionic surfactants, oil field demulsifiers, pesticide emulsifiers and Wetting agent etc. Propylene oxide is also often used to produce various non-polyol-based surfactants, hydroxypropyl methylcellulose, hydroxypropyl cellulose, hydroxypropyl starch, propylene glycol alginic acid and propylene oxide rubber. The largest use of propylene oxide is to produce polyether polyols...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/064C07C305/04
CPCY02P20/584
Inventor 王野汪晓星张庆红郭倩楼银川
Owner XIAMEN UNIV