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Process for preparing ethylene glycol by ethylene oxide catalytic hydration

A technology for catalytic hydration of ethylene oxide and ethylene oxide, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc. Pollution of the environment and other problems, to achieve the effects of excellent stability, high selectivity, and no pollution to the environment

Inactive Publication Date: 2005-09-14
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 in the previous literature, or the liquid acid catalyst used for catalytic hydration corrodes equipment, pollutes the environment, and the solid acid catalyst has poor stability or stability and activity. Can not take care of both at the same time, resulting in the defects of high energy consumption and high cost of the method. A method for preparing ethylene glycol by catalytic hydration of ethylene oxide is provided. This method is suitable for low water ratio operation and greatly reduces the excess water in the treatment reaction. The required thermal energy, the catalyst used not only has good activity and selectivity, but also has excellent stability, 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

[0044] Dissolve 6.3 grams of commercially available niobic acid in a hot oxalic acid solution (prepared by dissolving 70 grams of oxalic acid in 500 ml of water) to prepare a niobic acid solution; prepare 50 ml of a 10% (weight) dilute nitric acid aqueous solution according to a conventional method. Weigh α-Al 2 O 3 100 grams of carrier powder and 0.5 grams of germanium dioxide are added to the kneader, and then the above-prepared niobic acid and nitric acid solution are added, and the carrier is fully kneaded in the kneader to form a lump material, which is extruded into It was dried at 150°C for 2 hours and calcined in air at 600°C for 4 hours to obtain catalyst A. According to the weight percentage of the carrier, the composition of catalyst A:

[0045] 5.0% Nb 2 O 5 -0.5%GeO 2 / α-Al 2 O 3 .

Embodiment 2

[0047] Dissolve 20 g of commercially available niobium acetate in 40 ml of fumaric acid solution to make a niobic acid solution; add 3.6 g of SnCl 2 ·2H 2 O was dissolved in 15 ml of dilute hydrochloric acid solution with a concentration of 10% by weight to prepare a stannous chloride solution. Weigh Al 2 O 3 Powder 60 grams and SiO 2 40 grams of powder, mixed thoroughly, first immerse in the above niobic acid solution for 2 hours, filter off the solution, vacuum dry at 120°C for 2 hours, then immerse in stannous chloride solution for 2 hours, filter, and vacuum dry at 120°C for 2 hours , And then add 70 grams of polyvinyl alcohol solution, fully kneaded with the carrier in a kneader to form a mass, extruded, dried in vacuum at 120°C for 2 hours, and calcined in an ammonia atmosphere at 500°C for 4 hours to obtain catalyst B . According to the weight percentage of the carrier, the composition of catalyst B: 10% Nb 2 O 5 -2.4% SnO 2 / 60% Al 2 O 3 +40%SiO 2 .

Embodiment 3

[0049] 18.8 grams of niobic acid, 100 grams of ZrO 2 The carrier is added to the kneader and mixed thoroughly, then a certain amount of lead nitrate aqueous solution and 40 ml of dilute nitric acid binder with a concentration of 2% (by weight) are added, fully kneaded to form a mass, extruded, and dried at 100°C for 3 hours , Calcined in air at 200°C for 4 hours to obtain catalyst C. According to the weight percentage of the carrier, the composition of catalyst C: 15% Nb 2 O 5 -1.0%PbO 2 / ZrO 2 .

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Abstract

The invention relates to a method for preparing ethylene glycol by catalytic hydration of ethylene oxide, which mainly solves the problem that the non-catalytic hydration water ratio of ethylene oxide in the past is too high, or the liquid acid catalyst used for catalytic hydration corrodes equipment, pollutes the environment, and solidifies Acid catalysts are poor in stability or their stability and activity cannot reach the ideal state at the same time. Provide a method for the catalytic hydration of ethylene oxide to prepare ethylene glycol. The solid acid catalyst used in this method uses niobium compounds as the main active component , using at least one selected from germanium, tin, lead, antimony, phosphorus, sulfur, iron or cobalt as additives, reacting to prepare ethylene glycol under conditions of lower water ratio, which can greatly reduce the need for processing excess water The catalyst used not only has good activity and selectivity, but also has excellent stability, prolongs the operation period of the catalyst, and has the characteristics of low energy consumption and low production cost. It can be used in the industrial production of ethylene 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 catalytic hydration of ethylene oxide using a supported niobic acid as a catalyst. Background technique [0002] Ethylene glycol is an important aliphatic glycol with a wide range of uses. The main purpose is to produce polyester resins, including fibers, films and engineering plastics. It can also be used directly as a coolant and antifreeze. It is also an indispensable substance for the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0003] Using ethylene oxide as a raw material to prepare ethylene glycol, there are two main process routes: one is the direct hydration method, where ethylene oxide and water react to form ethylene glycol under certain conditions. The reaction can proceed without a cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/00C07C31/20
Inventor 李应成何文军费泰康王嘉华
Owner CHINA PETROLEUM & CHEM CORP
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