Crude glycerin distillation
The boiling point of glycerin at atmospheric pressure is 290 ℃, and at 204 ℃ it begins to decompose and polymerize, so crude glycerol distillation needs to be carried out under decompression. For example, under the pressure of 20mmHg, the boiling point of glycerol is 181.34℃, and it is 116.11 ℃ at 10mmHg pressure. In order to further…