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Solid acid catalyzer for producing glycol by hydrating ethylene oxide

A technology of ethylene oxide hydration and solid acid catalyst, which is applied in the direction of molecular sieve catalyst, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Acid catalysts have poor stability and high production costs, and achieve the effects of long life, high selectivity, and reduced production energy consumption

Active Publication Date: 2005-01-19
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 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 for catalytic hydration corrodes equipment, pollutes the environment, and solid acid The catalyst has poor stability or the defect that stability and activity cannot be taken into account at the same time. A solid acid catalyst for the production of ethylene glycol by hydration of ethylene oxide is provided. The catalyst is used for the hydration reaction of ethylene oxide to produce ethylene glycol. It not only has good Activity and selectivity, suitable for low water ratio operation, and at the same time have good stability, can significantly reduce energy consumption and greatly reduce production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 10 grams of niobic acid, 100 grams of α-Al 2 o 3 Add the powder into a kneader and mix thoroughly, add 4.4 milliliters of chromium (III) nitrate aqueous solution with a concentration of 0.03% (weight), and 55 milliliters of 10% (weight) dilute nitric acid, fully knead to form a lump material, and extrude , dried at 150°C for 2 hours, and calcined in air at 200°C for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.

Embodiment 2

[0039] Fully mix 60 grams of alumina and 40 grams of silicon dioxide, then add 60 milliliters of 10% (weight) dilute nitric acid, fully knead in a kneader to form a lump material, extrude, and dry at 150 ° C for 2 hours , baked at 1400°C for 4 hours to obtain a strip-shaped carrier. Crush the carrier, impregnate the above carrier with a certain concentration of 125 mmol / L ammonium molybdate aqueous solution at room temperature, the volume ratio of impregnation liquid to solid is 2:1, impregnate for 2 hours, filter off the solution, and vacuum dry at 120°C for 2 hours ; Then with a certain amount of weight concentration of 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 impregnation liquid-solid volume ratio is 2:1, the impregnation time is 2 hours, the solution is filtered off, and vacuum-dried at 120° C. for 2 hours, so that the impregnation is carri...

Embodiment 3

[0041] Fully mix 48.5 grams of niobium oxalate and 100 grams of titanium dioxide to obtain a mixture, impregnate the mixture with a certain concentration of 25 mmol / L ammonium tungstate solution at room temperature and under vacuum conditions, the liquid-solid volume ratio is 2:1, impregnate After 2 hours, add 5 grams of dextrin and an appropriate amount of water, fully knead in a kneader to form a lump material, extrude, dry at 100°C for 3 hours, and roast at 400°C for 4 hours in a nitrogen atmosphere to obtain catalyst C. The catalyst composition is shown in Table 1.

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PUM

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Abstract

The invention relates to a solid acid catalyst for preparing glycol by hydration of ethylene oxide for reducing water rate, energy consumption and cost, abating the pollution, and improving catalyst stability. The technology for preparing the catalyst is that: niobium-supported oxide on oxide carrier is served as main active component, VIB metal compound and metal cerium, manganese, thorium or their compound are added as promoter. The catalyst is used for preparing glycol by hydration of ethylene oxide with good activity, selectivity and stability, low energy consumption and low cost.

Description

technical field [0001] The invention relates to a solid acid catalyst for producing ethylene glycol through the hydration reaction of ethylene oxide, in particular to a niobic acid catalyst for the production of ethylene glycol through the hydration reaction of 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] There are two main processes for preparing ethylene glycol from ethylene oxide: one is the direct hydration method, in which ethylene oxide and water react to form ethylene glycol under certain conditions, and the reaction can be carried o...

Claims

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Application Information

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IPC IPC(8): B01J23/16B01J23/34B01J29/076C07C31/20
Inventor 李应成何文军费泰康何立
Owner CHINA PETROLEUM & CHEM CORP
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