Composite alkali catalyzed glycerol polymerization process
A technology of polymerization process and compound alkali, which is applied in the field of polymerization process of glycerin to achieve the effects of high conversion rate, good color and high product purity
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Embodiment 1
[0022] Add 1Kg of glycerin into the reaction kettle equipped with a water separator, control the reaction pressure to 0.1Mpa, raise the temperature of the reaction kettle to 200°C, add 20g of inorganic base and 30g of sodium methoxide composite catalyst, stir the reaction, and pass the separation after a period of reaction. The degree of polymerization of the product is roughly determined by the amount of water in the water container. When the required amount of water is reached, the reaction is stopped, and the temperature is cooled to room temperature naturally. After the polymerization is completed, the polymerization product is separated and purified to obtain 950g; The mass ratio of potassium, magnesium oxide and potassium silicate is 1:2:17; after testing, the average molecular weight of the polyglycerol-10 product is 749, the average number of hydroxyl groups is 11.9, the purity is 99.5%, and the ash content is <0.0007wt %.
Embodiment 2
[0024] Add 1Kg of glycerin into the reaction kettle equipped with a water separator, control the reaction pressure to 0.1Mpa, raise the temperature of the reaction kettle to 200°C, add 20g of inorganic base and 30g of potassium methylate composite catalyst, stir the reaction, and pass the separation after a period of reaction. The degree of polymerization of the product is roughly determined by the amount of water in the water container. When the required amount of water is reached, the reaction is stopped, and the temperature is cooled to room temperature naturally. After the polymerization is completed, the polymerization product is separated and purified to obtain 952g; the carbonic acid in the composite catalyst The mass ratio of sodium, calcium oxide and sodium silicate is 1:3:15; after testing, the average molecular weight of the polyglycerol-10 product is 757, the average number of hydroxyl groups is 12.1, the purity is 99.5%, and the ash content is <0.0006wt %.
Embodiment 3
[0026] Add 1Kg of glycerin into the reaction kettle equipped with a water separator, control the reaction pressure to 0.1Mpa, raise the temperature of the reaction kettle to 200°C, add 30g of inorganic base and 40g of sodium methoxide composite catalyst, and stir the reaction. The degree of polymerization of the product is roughly determined by the amount of water in the water container. When the required amount of water is reached, the reaction is stopped, and the temperature is cooled to room temperature naturally. After the polymerization is completed, the polymerization product is separated and purified to obtain 939g; The mass ratio of potassium, calcium oxide and sodium silicate is 1:3:20; after testing, the average molecular weight of the polyglycerol-10 product is 750, the average number of hydroxyl groups is 11.9, the purity is 99.5%, and the ash content is <0.0007wt %.
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