Solid acid catalyzer for preparing glycol by hydrating ethylene oxide

Abstract

The invention relates to a solid acid catalyst for preparing glycol by hydration of ethylene oxide for reducing water rate, energy consumption and cost, abating the pollution, and improving catalyst stability. The technology for preparing the catalyst is that: niobium-supported metal compound on oxide carrier is served as main active component, IVB metal compound and at least one of vanadium or tantalum metal compound are added as promoter. The catalyst is used for preparing glycol by hydration of ethylene oxide with good activity, selectivity and stability, low energy consumption and low cost.

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 catal...

Examples

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...

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 catal...

Examples

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...