The global demand for triglyceride grows at a rate of nearly 10%, and the consumption of triglyceride reached nearly 4 million tons in 2010. China is a big consumer of triglyceride products, and a large amount of imports are needed every year to make up for the gap in domestic production. Glycerin carbonate (gc) can be used as a highly polar solvent or valuable polymer intermediate component, is the preparation of surfactants, clothes, detergent, new coatings, but also a new gas separation membrane and an important part of polyurethane foam particles, glycerin carbonate is also a good cosmetic moisturizer and drug carrier solvent and emulsifier. It is very versatile.   At present, the synthesis methods of glycerol carbonate mainly include phosgene, carbonylation, urea alcoholysis and transesterification, etc. However, the conversion and selectivity of glycerol carbonate have problems to varying degrees. Moreover, there is no large-scale industrial production of glycerol carbonate in China, which mainly relies on imports.   Us patent us2446145 and Japanese patent jp6009610 describe the synthesis of glycerol carbonate with phosgene, phosgene is a serious drug, and a large amount of hydrogen chloride produced in the reaction process is very harmful to human body, easy to cause environmental pollution, and has been gradually phased out.   Us patent us6025504 and Chinese patent cn101811971b and cn102285957b describe the reaction of glycerin and urea as raw materials under the catalysis of metal oxides or in the presence of Lewis acid catalyst to generate glyceryl carbonate. The disadvantage is that the reaction generates a large amount of ammonia, which needs to be carried out under vacuum and requires high equipment requirements. At the same time, the catalyst used is difficult to separate from the product, resulting in the product quality is not high.   Chinese patent cn101287710a, cn101717338a and US patent us201828 describe the advantages of using glycerol and dimethyl carbonate to prepare glycerol carbonate, such as: The reaction conditions are mild, the by-product methanol is easy to get out and does not require high temperature and pressure. The disadvantages are low glycerol conversion rate, expensive catalyst, much heat energy consumption for distilling remaining raw materials, and low product purity.   In addition, Chinese colleges and universities have also begun to study the direct preparation of glycerol carbonate with carbon dioxide by using biodiesel - based crude glycerol as raw material under the action of supported tin - based catalyst.