Method for synthesizing glycerol carbonate by using glycerol

The invention discloses a method for synthesizing glycerol carbonate by using glycerol. Mainly by taking ethylene carbonate, urea and glycerol as raw materials and Louis salt and zinc sulfate as a catalyst, the method comprises the steps: adding ethylene carbonate, urea and glycerol into a four-mouth bottle; firstly heating the raw materials to 110 DEG C to smelt the raw materials; carrying out reaction for 8-9 hours under high speed stirring, wherein the reaction temperature is 180-190 DEG C; carrying out vacuum filtration on a product to remove a small amount of fixed impurities to obtain coarse glycerol carbonate; removing glycerol by carrying out pressure reduction and distillation on the coarse glycerol carbonate to obtain glycerol carbonate with relatively high purity; and removing ammonia gas generated in the reaction process through hot reductive iron powder so as to improve the conversation rate of glycerol. According to the method disclosed by the invention, no other solutions are needed to be added in the reaction process, the ammonia gas is thoroughly removed, and the glycerol conversion rate is improved; and the raw materials used in the reaction are nontoxic, are low in cost and are easily available, the glycerol conversion rate is high, the impurities are less, the process is simple, and the subsequent separation and purification are easy.