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Preparation method of catalyst for synthesizing glycerol carbonate through urea method

A technology of glycerin carbonate and catalyst, applied in the application field of glycerin, which can solve the problems of low reaction yield of glycerin and urea, achieve good industrialization prospects, save resources, and reduce environmental pollution

Inactive Publication Date: 2016-06-15
JIANGNAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this method has the advantage of high activity, which solves the technical problem of low reaction yield of glycerol and urea

Method used

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  • Preparation method of catalyst for synthesizing glycerol carbonate through urea method

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Effect test

Embodiment 1

[0015] Preparation of zinc glycerol: Mix 2 g of zinc acetate and 10 g of glycerin and stir at 160°C for 5 hours under reflux. After stirring, transfer the mixture to a 100mL reaction kettle, react hydrothermally at 150°C for 18 hours, cool, and filter the mixture. After washing with pure water for 3 times, dry at 80°C for 12 hours, and the obtained white solid is zinc glycerol;

[0016] Calcination: The obtained white solid was calcined at 550° C. for 3 h at a heating rate of 2° C. / min to obtain the metal oxide catalyst zinc oxide.

Embodiment 2

[0018] Under the situation that the preparation condition of catalyzer is exactly the same as embodiment 1, only the mass ratio of zinc acetate and glycerin in the preparation method is 1: 10 changed into 1: 5, 1: 9, 1: 13, 1: 17, 1:20, five metal oxide catalysts were obtained.

Embodiment 3

[0020] Accurately weigh 2.3g of analytically pure glycerin and add it to a 100mL three-necked round-bottomed flask, preheat it under the oil to the set temperature, then add a certain amount of urea and metal oxide catalyst into the three-necked round-bottomed flask, under the action of magnetic stirring After reacting under reduced pressure for a period of time, add a certain amount of methanol to the product and centrifuge to separate the catalyst. The separated supernatant was used for yield analysis by gas chromatography, and the solid catalyst at the bottom was recovered by washing and drying with methanol.

[0021] With the metal oxide catalysts of Example 1 and Example 2, the amount of catalyst is a certain value, the reaction temperature is a certain value, the molar ratio of glycerol to urea is a certain value, and the reaction time is a certain value, 1.0kPa. When the mass ratio of zinc acetate to glycerol is a certain value, the yield of glycerol carbonate reaches t...

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Abstract

The invention discloses a preparation method of a catalyst for synthesizing glycerol carbonate through a urea method. The preparation method of the catalyst zinc oxide (ZnO) comprises the steps that a precursor is synthesized through a hydrothermal method, and the metallic oxide catalyst ZnO is prepared through calcination. The preparation method has the advantages that the prepared catalyst is used for a reaction of synthesizing glycerol carbonate, the activity is high, the raw material cost is low, the stability is good, a catalytic reaction system is a heterogeneous catalytic system, separation of a product and the catalyst is convenient, recycling and reusing are convenient to achieve, environmental contamination is reduced, resources are saved, and a good industrial prospect is achieved.

Description

technical field [0001] The invention relates to a preparation method and application of a zinc oxide catalyst for synthesizing glycerol carbonate, and belongs to the technical field of glycerin application. Background technique [0002] At present, biodiesel has become a hot spot in the development of new energy sources in the world. A large amount of by-product glycerol is produced during the production of biodiesel. The conversion of cheap and renewable by-product glycerol into high value-added products has attracted increasing attention. [0003] Glycerol carbonate is a small molecular substance with bifunctional groups (five-membered ring and hydroxyl group). It is widely used in medicine because of its characteristics of easy biodegradation, low toxicity, high boiling point, odorless, non-corrosive, non-polluting, and non-flammable. , cosmetics, textiles, coatings, plastics, polyurethane, new energy and other fields. [0004] Glycerol carbonate can be directly synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06C07D317/36
CPCY02P20/584B01J23/06C07D317/36
Inventor 张萍波柳利花范明明蒋平平
Owner JIANGNAN UNIV
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