Solid acid catalyst for preparing glycol by hydrating ethylene oxide

A technology of ethylene oxide hydration and solid acid catalysts, which is applied in the direction of molecular sieve catalysts, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Acid catalyst poor stability, environmental pollution and other problems, to achieve excellent reaction performance, excellent stability, high selectivity effect

Inactive Publication Date: 2006-05-10
SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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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 defect of poor stability or stability and activity that cannot be taken into account at the same time provides a solid acid catalyst for preparing ethylene glycol by hydration of ethylene oxide, which is used for hydration of ethylene oxide to prepare ethylene glycol, 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

[0041] 10 grams of niobic acid, 0.5 grams of titanium dioxide and 100 grams of α-Al 2 o 3 Fully mix in a kneader, then add 60 milliliters of dilute nitric acid with a weight concentration of 5%, knead to form a lump material, extrude, dry at 150° C. for 2 hours, and roast at 400° C. in air for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.

Embodiment 2

[0043] Add 60 grams of alumina and 40 grams of silicon dioxide into the kneader, mix well, then add 60 milliliters of dilute nitric acid with a concentration of 1% (by weight), knead to form a lump material, extrude, and dry at 150 ° C for 2 hour, 1400°C roasting for 4 hours to make a strip-shaped carrier, crush the carrier, weigh 12.5 grams of niobic acid and 1.0 gram of zirconium dioxide and fully mix with the crushed carrier, add 70 milliliters of binder polyvinyl alcohol solution, and then After kneading and extrusion, vacuum drying at 120°C for 2 hours, and calcination at 500°C for 4 hours in an ammonia atmosphere, catalyst B was obtained. The catalyst composition is shown in Table 1.

Embodiment 3

[0045] 80 grams of alumina and 20 grams of zeolite (SiO 2 / Al 2 o 3 Molar ratio 12) join in the kneader, mix uniformly, then add 55 milliliters of the dilute nitric acid of concentration 1.5% (weight), knead and form lump material, extrude molding, dry 2 hours in 150 ℃, roast 4 hours in 1200 ℃ After 1 hour, a bar-shaped carrier was made, and the carrier was pulverized and mixed with 3 grams of titanium dioxide to obtain a mixture. 16.5 grams of commercially available niobium acetate are dissolved in 110 milliliters of citric acid to make niobic acid solution; 0.26 gram of ammonium metavanadate is dissolved in 50 milliliters of 5% (weight) hydrogen peroxide solution to make ammonium metavanadate solution; The above mixture was impregnated with niobic acid solution at room temperature, the volume ratio of impregnated liquid to solid was 2:1, and the impregnated time was 2 hours. Immerse for 2 hours, vacuum dry at 120°C for 2 hours, then add 70 ml of 10% (weight) polyvinylpyrr...

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PUM

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Abstract

The invention relates to a solid acid catalyst for preparing ethylene glycol by hydration of ethylene oxide, which mainly solves the problem of high water ratio, high energy consumption, high production cost, or liquid used in catalytic hydration of ethylene oxide in the past. Acid catalysts corrode equipment, pollute the environment, and solid acid catalysts have poor stability or the defects of stability and activity cannot be taken into account at the same time. A solid acid catalyst for preparing ethylene glycol by hydration of ethylene oxide is provided. The metal compound is used as the main active component, and the technical scheme of at least one auxiliary agent selected from the metal compound of IVB and the metal compound of vanadium or tantalum is optionally added, and the solid acid catalyst prepared is used for the hydration of ethylene oxide to prepare ethylene oxide. The diol reaction not only has good activity and selectivity, is suitable for low water ratio operation, but also has good stability, which can significantly reduce energy consumption and greatly reduce production costs. It can be used in the industrial production of ethylene glycol.

Description

technical field [0001] The invention relates to a solid acid catalyst for preparing ethylene glycol by the hydration reaction of ethylene oxide, in particular to a niobic acid catalyst for preparing ethylene glycol by 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 out without a cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/076B01J23/20C07C31/20
Inventor 李应成何文军何立费泰康
Owner SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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