Columbium oxide catalyst for hydrating epoxy ethane to prepare ethandiol

A technology of ethylene oxide hydration and ethylene glycol, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydroxyl addition preparations, etc., can solve the problem that stability and activity cannot be balanced at the same time. , high production cost, environmental pollution and other problems, to achieve the effect of excellent reaction performance, high selectivity, and no pollution to the environment

Active Publication Date: 2008-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the high ratio of water in the non-catalytic hydration reaction of ethylene oxide, high energy consumption, high production cost, or the liquid acid catalyst used in catalytic hydration will corrode equipment, pollute the environment, and have poor stability in the previous literature. Or stability and activity can not be taken into account at the same time, to provide a new niobium oxide 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

[0030] Mix TEOS (tetraethyl orthosilicate) and titanium oxide sol according to a certain ratio, add 5% polyvinyl alcohol aqueous solution and stir evenly. The niobium isopropoxide solution was added to the above solution, vigorously stirred for 30 minutes, and then allowed to stand at 60° C. until a gel was formed. It was left at room temperature for 48 hours, aged at 80°C for 16 hours, dried at 120°C for 4 hours, and calcined in an oxygen atmosphere at 500°C for 8 hours to obtain catalyst A. The composition of the catalyst is shown in Table 1.

Embodiment 2

[0032] Fully mix 15 grams of niobium phenolate, 70 grams of silicon dioxide and 30 grams of zirconium dioxide in a kneader, then add 60 milliliters of dilute nitric acid with a weight concentration of 1%, knead to form a lump material, extrude into a strip, and heat at 700 ° C in the air Calcined for 4 hours to obtain catalyst B. The catalyst composition is shown in Table 1.

Embodiment 3

[0034] Dissolve the niobium amine complex in water to make a solution with a concentration of 0.12 g / ml, impregnate the Ti-HMS molecular sieve with the solution, the volume ratio of the impregnation liquid to solid is 2.5:1, the impregnation time is 2 hours, filter the solution, and filter the solution at 120 °C for 2 hours, and then calcined for 4 hours in an ammonia atmosphere at 600 °C to obtain catalyst C. The catalyst composition is shown in Table 1.

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Abstract

A niobium oxide catalyst for preparing ethanediol by hydrating epoxy ethane is a carried oxide of niobium and its raw material is chosen from niobium halide, alkoxyniobium, carboxylic acid derivative of niobium, phenolic niobium, niobium carboxylate and niobium-ammonia complex. Its advantages are low consumption of water and energy, and no corrosion and pollution.

Description

technical field [0001] The invention relates to a niobium oxide catalyst for preparing ethylene glycol by hydrating ethylene oxide. 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] At present, the industrial preparation of ethylene glycol adopts the direct hydration method. The method does not use a catalyst, the molar ratio of reaction feed water to ethylene oxide (hereinafter referred to as the water ratio) is 20-25:1, the reaction temperature is 150-200°C, the reaction pressure is 0.8-2.0MPa, and the reaction time is about 30 minutes , the conversion rate of ethylene oxide is close to 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20C07C29/05C07C31/20
Inventor 李应成何文军费泰康何立
Owner CHINA PETROLEUM & CHEM CORP
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