Method for recovering polyol from polyurethane waste

A method for recovering polyol from a polyurethane waste, comprising the steps of:

• subjecting the polyurethane waste to degradation using a degradation agent, and then removing the degradation agent to obtain a degradation product comprising an amine compound and a polyol compound;
• subjecting the degradation product and a treatment agent represented by Formula (I) to a reaction to obtain a reaction solution comprising a reaction product and the polyol compound, the reaction product being formed by reacting the amine compound in the degradation product with the treatment agent, the reaction product being in a liquid form at 20° C. to 40° C.;
• and
• subjecting the reaction solution to distillation to remove an unreacted portion of the treatment agent, thereby obtaining a polyol mixture comprising the reaction product and the polyol compound;
• wherein in Formula (I),
• X is O or N—R, R is hydrogen or a straight chain alkyl group;
• n is 2;
• R1 and R2 each represents hydrogen, a straight chain alkyl group or a branched chain alkyl group;
• R1 on different carbon atoms is the same or different;
• and
• R2 on different carbon atoms is the same or different.

A method for recovering polyol from a polyurethane waste, comprising the steps of:

• subjecting the polyurethane waste to degradation to obtain a degradation product;
• subjecting the degradation product and a treatment agent represented by Formula (I) to a reaction to obtain a reaction solution;
• and
• subjecting the reaction solution to distillation to obtain a polyol mixture comprising a polyol compound;
• wherein in Formula (I),
• X is O or N—R, R is hydrogen or a straight chain alkyl group;
• n is an integer ranging from 2 to 4;
• R1 and R2 each represents hydrogen, a straight chain alkyl group or a branched chain alkyl group;
• R1 on different carbon atoms is the same or different;
• and
• R2 on different carbon atoms is the same or different.