Solid acid catalyst for hydration of epoxy ethane to produce ethandiol

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 catalyst poor stability, environmental pollution and other problems, to achieve excellent reaction performance, excellent stability, high selectivity effect

Active Publication Date: 2006-10-04
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 and high cost, or the liquid acid catalyst used for catalytic hydration corrodes equipment and pollutes the environment. The defects of poor stability or stability and activity that cannot be taken into account at the same time provide a solid acid catalyst for the hydration of ethylene oxide to produce ethylene glycol. The catalyst is used for the hydration of ethylene oxide to prepare ethylene glycol. It not only has good Excellent 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

[0040] 10 grams of niobate, 0.05 grams of germanium dioxide and 100 grams of α-Al 2 O 3 Mix well in a kneader, then add 50 ml of dilute nitric acid with a concentration of 1% by weight and 8.8 ml of an aqueous solution of chromium (III) nitrate with a concentration of 0.03% by weight, knead to form a mass, extrude into strips, and dry at 100 ° C Catalyst A was obtained by calcining in air at 300°C for 2 hours for 4 hours. The catalyst composition is shown in Table 1.

Embodiment 2

[0042] Add 60 grams of alumina and 40 grams of silicon dioxide into the kneader, mix evenly, then add 60 ml of dilute nitric acid with a concentration of 2% by weight, knead to form a mass material, extrude into strips, and dry at 150 ° C for 2 1400 ℃ roasting for 4 hours to make a bar-shaped carrier, pulverize the carrier, impregnate the above-mentioned carrier with a certain amount of ammonium molybdate aqueous solution with a concentration of 125 mmol / L at room temperature, the immersion liquid solid volume ratio is 2:1, and the impregnation is carried out. After 2 hours, the solution was filtered off and vacuum dried at 120°C for 2 hours; 12.5 g of niobic acid, 3.15 g of SnCl were weighed 2 ·2H 2 O is fully mixed with the carrier impregnated with molybdenum, 70 ml of binder polyvinyl alcohol solution is added, and after kneading and extruding, vacuum drying at 120 ° C for 2 hours, and calcination in 400 ° C ammonia atmosphere for 4 hours to obtain catalyst B . The cataly...

Embodiment 3

[0044] Add 20.2 g of niobium oxalate and 100 g of SAPO-34 into the kneader, then add 55 ml of aluminum sol with a concentration of 10% by weight, knead to form a mass, extrude into strips, and dry at 100 ° C for 2 hours at 600 °C. calcined at °C for 4 hours to form a strip-shaped carrier. The catalyst precursor was vacuum impregnated with a certain concentration of 25 mmol / L ammonium tungstate solution with a liquid-solid volume ratio of 2:1, impregnated for 2 hours, the solution was filtered off, and dried at 120° C. for 2 hours to obtain mixture 1. Dissolve a certain amount of lead nitrate in water to make an aqueous solution and impregnate it on the mixture 1, the volume ratio of the impregnating liquid to solid is 1.5:1, the impregnation time is 2 hours, the solution is filtered off, dried again at 120 ° C for 2 hours, in the air at 400 ° C After calcination for 2 hours, catalyst C was obtained. The catalyst composition is shown in Table 1.

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Abstract

A solid acid catalyst for preparing ethanediol by hydrating epoxy ethane is composed of oxide carrier, active component (niobium compound), and the assistant chosen from the compound of metal in IVA or VIB and the metal compound containing Ce or Th. Its advantages are high activity, selectivity and stability, and low consumption of water and energy.

Description

technical field [0001] The present invention relates to a kind of solid acid catalyst used for ethylene oxide hydration reaction to produce ethylene glycol, in particular to a niobic acid catalyst used for ethylene oxide hydration reaction to produce ethylene glycol. Background technique [0002] Ethylene glycol is an important aliphatic diol with a wide range of uses, mainly in the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as a coolant and antifreeze, and is also an indispensable material for the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0003] There are two main process routes for preparing ethylene glycol with ethylene oxide as raw material: one is direct hydration method, ethylene oxide reacts with water under certain conditions to generate ethylene glycol, and the reaction can be carried out without a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20B01J29/04B01J29/076C07C31/20C07C29/10B01J23/24
Inventor 李应成何文军费泰康王嘉华周斌
Owner CHINA PETROLEUM & CHEM CORP
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