Process for preparing ethandiol by catalytic hydration of epoxyethane

A technology for catalytic hydration of ethylene oxide and ethylene oxide, which is applied in the fields of hydrolysis preparation, organic chemistry, bulk chemical production, etc., can solve the problem of ethylene glycol catalyst polluting the environment, high ratio of ethylene glycol reaction water, catalyst High reaction water ratio and other issues

Inactive Publication Date: 2005-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the high reaction water ratio of non-catalytic hydration to prepare ethylene glycol in the previous literature, and the catalyst used to prepare ethylene glycol pollutes the environment, affects product quality, poor stability, and the catalyst reaction water ratio. high, resulting in huge energy consumption and high production costs. A method for preparing ethylene glycol by catalytic hydration of ethylene oxide is provided. The catalyst used in the method has good activity, selectivity and good stability. , especially suitable for low water ratio operation, which greatly reduces the heat energy required to treat excess water, and has the characteristics of low energy consumption and low production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 12 grams of commercially available niobium oxalate and dissolve it in 40 milliliters of water to make a niobium oxalate solution; weigh 1.8 grams of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 5 ml of 10% dilute nitric acid aqueous solution to make a zinc nitrate solution. Weigh 100 grams of α-alumina, add it to the kneader, then add the niobium oxalate and zinc nitrate solutions prepared above, fully knead with α-alumina to form a mass material, extrude into strips, and place in the air at 150°C. After drying for 2 hours, the catalyst A was obtained by calcining in air at 600°C for 4 hours. The catalyst composition is shown in Table 1.

Embodiment 2

[0045] Weigh 90 grams of α-alumina, 10 grams of titanium dioxide and 12 grams of commercially available niobic acid, respectively, add them to the kneader and mix them well to obtain a mixed material, and weigh 8.1 grams of Cd (NO 3 ) 2 ·6H 2 O was dissolved in 40 ml of 10% dilute nitric acid aqueous solution to prepare a cadmium nitrate solution, which was added to the aforementioned mixture, kneaded and extruded, dried under vacuum at 120°C for 2 hours, and baked at 500°C in an ammonia atmosphere for 4 hours , to obtain catalyst B. The catalyst composition is shown in Table 1.

Embodiment 3

[0047] Catalyst C was prepared by the method of Example 2, except that in the preparation process, the amount of niobium amine complex was 7.6 grams, titanium dioxide was 100 grams, Cd (NO 3 ) 2 ·6H 2 O2.7 g was dissolved in 40 ml of water, dried in air at 100°C for 3 hours, and calcined in air at 200°C for 4 hours. The catalyst composition is shown in Table 1.

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Abstract

The present invention relates to process of catalytic hydration of ethylene epoxide to prepare glycol and aims at solving the problems of available corresponding process. The said process is especially suitable for low water ratio operation, and has the features of very low heat energy consumption and power consumption, high activity, selectivity and stability of catalyst, and low production cost. The said process may be used in industrial production of glycol.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by catalytic hydration of ethylene oxide, in particular to a method for preparing ethylene glycol by using a supported niobic acid as a catalyst. 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] The preparation of ethylene glycol with ethylene oxide as a raw material is mainly divided into two methods. One is the direct hydration method, that is, ethylene oxide directly reacts with water to generate ethylene glycol under certain conditions, and the reaction does not require a catalyst. It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/10C07C31/20
CPCY02P20/52
Inventor 李应成何文军费泰康王嘉华
Owner CHINA PETROLEUM & CHEM CORP
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