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, organic compounds, chemical instruments and methods, etc., can solve the problem of incompatibility between stability and activity, poor stability of solid acid catalysts, Environmental pollution and other problems, to achieve the effect of excellent stability, high selectivity, and no environmental pollution

Inactive 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 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] 6.3 grams of commercially available niobic acid are dissolved in hot oxalic acid solution (dissolved in 500 milliliters of water by 70 grams of oxalic acid and made), making niobic acid solution; 50 milliliters of 10% (weight) dilute nitric acid aqueous solution is prepared according to conventional methods. Weigh α-Al 2 o 3 Add 100 grams of carrier powder and 0.5 grams of germanium dioxide into the kneader, then add the niobic acid and nitric acid solution prepared above, and fully knead with the carrier in the kneader to form a lumpy material, which is extruded and formed. Dry at 150°C for 2 hours, and calcinate in air at 600°C for 4 hours to obtain catalyst A. In terms of carrier weight percentage, catalyst A consists of:

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

Embodiment 2

[0047] Dissolve 20 grams of commercially available niobium acetate in 40 milliliters of fumaric acid solution to make niobic acid solution; dissolve 3.6 grams of SnCl 2 2H 2 O is dissolved in 15 milliliters of dilute hydrochloric acid solution for concentration 10% (weight), makes stannous chloride solution. Weigh Al 2 o 3 Powder 60g and SiO 2 40 grams of powder, mixed well, soaked in the above niobic acid solution for 2 hours, filtered off the solution, vacuum dried at 120°C for 2 hours, then soaked in stannous chloride solution for 2 hours, filtered, and vacuum dried at 120°C for 2 hours , and then add 70 grams of polyvinyl alcohol solution, and fully knead with the carrier in a kneader to form a lump material, extrusion molding, vacuum drying at 120 ° C for 2 hours, and roasting at 500 ° C for 4 hours in an ammonia atmosphere to obtain catalyst B . Catalyst B composition: 10% Nb by weight percentage of carrier 2 o 5 -2.4% SnO 2 / 60%Al 2 o 3 +40% SiO2 2 .

Embodiment 3

[0049] 18.8 grams of niobic acid, 100 grams of ZrO 2 Add the carrier into the kneader and mix well, then add a certain amount of lead nitrate aqueous solution and 40 ml of dilute nitric acid binder with a concentration of 2% (weight), fully knead to form a doughy material, extrude, and dry at 100 ° C for 3 hours , Calcined in air at 200°C for 4 hours to obtain catalyst C. Catalyst C composition: 15% Nb by weight percentage of carrier 2 o 5 -1.0%PbO 2 / ZrO 2 .

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Abstract

The invention relates to a process for preparing ethylene glycol by ethylene oxide catalytic hydration, wherein the solid acid catalyst employs niobium compounds as the main active components, at least one of germanium, tin, lead, antimony, phosphor, sulfur, ferrum and cobalt is used as the auxiliary agent for preparing ethylene alcohol at rather low water ratio conditions, the thermal energy needed for processing reacting excess water can be reduced substantially, the catalyst used possesses not only good activity, selectivity, but also fine steadiness.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by catalyzing hydration of ethylene oxide, in particular to a method for preparing ethylene glycol by catalyzing hydration of ethylene oxide by using a supported niobic acid as a catalyst. 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 out...

Claims

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Application Information

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Patent Type & Authority Applications(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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