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Catalyst used for hydrating epoxy ethane to prepare ethandiol

A technology of ethylene oxide hydration and catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydroxyl addition preparation, etc. Acid catalyst poor stability, high reaction water ratio and other problems, to achieve the effect of long life, high selectivity, low operating water ratio

Active Publication Date: 2006-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the water ratio of the non-catalytic hydration reaction of ethylene oxide in the previous literature is relatively high, the energy consumption is large, the production cost is high, or the liquid acid catalyst used for catalytic hydration corrodes the equipment, pollutes the environment, and the solid acid catalyst The problem of poor stability or the inability to balance stability and activity at the same time provides a new catalyst for the hydration of ethylene oxide to prepare ethylene glycol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Fully mix 113 grams of aluminum hydroxide powder, 5 grams of graphite, and 5 grams of squash powder, then add 60 milliliters of 4% (weight) dilute nitric acid, fully knead in a kneader to form a lump material, and extrude , dried at room temperature for 24 hours, dried at 150°C for 2 hours, and calcined at 1200°C for 4 hours to obtain strip-shaped α-Al 2 o 3 carrier. The oxalic acid solution containing 6.25 grams of niobic acid is impregnated on the prepared carrier, dried at 120°C for 2 hours; then ammonium metavanadate is dissolved in 5% (weight) hydrogen peroxide, impregnated on the catalyst again, dried at 120°C for 2 hours Hours; Finally, impregnate the catalyst with an aqueous solution of lanthanum trichloride and dry at 120°C for 2 hours. The above catalyst precursor was calcined in air at 700° C. for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.

Embodiment 2

[0041] Fully mix 67.6 grams of aluminum hydroxide, 40 grams of silicon dioxide, 8 grams of graphite, and 4 grams of cyclodextrin, then add 60 milliliters of 4% (weight) dilute nitric acid, and fully knead in a kneader to form a lump material , extruded, dried at 150°C for 2 hours, and calcined at 1400°C for 4 hours to obtain a strip-shaped carrier. Use a certain concentration of ammonium molybdate solution of 125 mmol / L to impregnate the above-mentioned carrier at room temperature, the volume ratio of impregnated liquid to solid is 2:1, impregnate for 2 hours, filter the solution, and dry in vacuum at 120°C for 2 hours; then use a certain 15% niobium ammonium complex solution (NH 4 [NbO(C 2 o 4 ) 2 (H 2 O) 2 ]·(H 2 O) n ) continue to impregnate the above-mentioned treated carrier at room temperature, the impregnating liquid-solid volume ratio is 2:1, the impregnating time is 2 hours, the solution is filtered off, and vacuum-dried at 120° C. for 2 hours, thus performing ...

Embodiment 3

[0043] Fully mix 40.5 grams of commercially available niobium oxalate, 15 grams of polyvinyl alcohol, 8 grams of precipitated sulfur, the required ammonium tungstate and 100 grams of titanium dioxide to obtain a mixture, then add an appropriate amount of water, and fully knead in a kneader to form Agglomerate material, extruded into strips, dried at 200°C for 3 hours, then impregnated with praseodymium trichloride solution with a concentration of 0.12 mol / liter into the above catalyst, dried at 150°C for 2 hours, and roasted in a carbon dioxide atmosphere at 400°C for 4 hours. hours, to obtain catalyst C. The catalyst composition is shown in Table 1.

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PUM

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Abstract

A catalyst for preparing ethanediol by hydrating epoxy ethane is composed of the oxide of carried Nb, at least one element or compound chosen from V, Mo, W, Sn and Pb, and at least one element or compound chosen from La, Pr and Nd. Its advantages are low consumption of water and energy and no corrosion and pollution.

Description

technical field [0001] The invention relates to a catalyst for hydration of ethylene oxide to prepare ethylene glycol, in particular to a niobium oxide catalyst for hydration of ethylene oxide to prepare ethylene glycol. Background technique [0002] Ethylene glycol is an important aliphatic dihydric alcohol with a wide range of uses, mainly for the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as coolant and antifreeze, and it is also an indispensable substance in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0003] There are two main research methods for preparing ethylene glycol from ethylene oxide: one is the direct hydration method, that is, ethylene oxide and water react under certain conditions to form ethylene glycol; the other is ethylene carbonate Ester method, that is, ethylene oxide is first combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J23/30C07C29/05
Inventor 李应成何文军费泰康何立
Owner CHINA PETROLEUM & CHEM CORP
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