1. The main methods of preparing polyglycerol from glycerin are: condensation of glycerin and epichlorohydrin, dehydration of glycerin and condensation of glycerin and epichlorohydrin. The preparation of polyglycerol from glycerol usually uses acid or base as catalyst. In the preparation of polyglycerol with alkali as catalyst, the raw material is easy to obtain, the process is mature, the production cycle is short, and the content of straight chain polyglycerol is high. However, there are many disadvantages, such as the need for high temperature reaction and poor product color. When acid is used as catalyst, although the temperature requirement is low, the requirements for equipment and reaction conditions are high, the content of straight chain polyglycerol is low, the product is complex and the color of the product is deep.<br>
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