Introduction: Chemical recovery means that the vegetable foam box uses the methods of alcoholysis, hydrolysis, alkaline hydrolysis, and pyrolysis under certain conditions to differentiate into polyols and aromatic amines, carbon dioxide, etc., and then separates the fractions through distillation and other equipment. To achieve the purpose of recovery.
In the research on the chemical recovery of wastes from vegetable foam boxes, the alcoholysis method was the most active and achieved good economic and environmental benefits, which was the key recovery method at that time.
2. Alkali hydrolysis method
The alkaline hydrolysis method uses an alkali metal hydroxide such as one or more mixtures of NaOH, LiOH, KOH, and Ca (OH) 2 as a differentiation agent, and a quaternary ammonium salt or a sulfate as an activator. In the differentiation device of the foam body, the mixture is heated to 160 ° C. under stirring to start the differentiation reaction, and the mixture is continuously mixed and kept for about 4 hours.
There are two methods for the pyrolysis of vegetable foam boxes. One method is to crack in an inert gas air or an oxidizing atmosphere at a high temperature of 250-1200 ° C. The product is a gaseous and liquid mixture.
I have learned about the contents of the vegetable foam box in the future, and will be more helpful to everyone in the future, so that it can be more convenient when used. About the above common sense, I will briefly introduce this.
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