| abstract |
The invention relates to a one-step method for preparing by-products of polyglycolic acid, and belongs to the technical field of chemical by-products processing. The invention provides a one-step method for preparing by-products of polyglycolic acid, which firstly removes unreacted glycolic acid and glycolide in by-products through continuous and high-efficiency fractional distillation technology. Then add an entrainer to the remaining solid, crack at high temperature to obtain glycolide, and combine and purify glycolide from two different sources to obtain a product with a purity greater than 99%, which effectively solves the problem of side effects produced in the process of preparing polyglycolic acid by the traditional one-step method. The problem that the product is difficult to handle can realize the reuse of the by-product, and has a broad application prospect. |