|
| Glycerol polymerization in the process of waste oil glycerol esterification |
| |
| DOI： |
| KeyWord:glycerol esterification biodiesel glycerol polymerization Zinc-based catalyst |
| FundProject: |
|
| Hits: 1748 |
| Download times: 452 |
| Abstract: |
| Based on the advantages of glycerol esterification in acid reduction and the problems of glycerol polymerization existing in the glycerol esterification process, the glycerol polymerization during glycerol esterification in acid reduction of waste oil was examined. The effects of temperature, glycerol dosage, catalyst type and catalyst dosage on glycerol polymerization were investigated and the polymerization degree of polyglycerol was determined. The results showed that higher glycerol polymerization rate and acid reduction rate were observed at higher temperature and higher molar ratio of glycerol to fatty acid. Under the conditions of reaction temperature 220?℃ and molar ratio of glycerol to fatty acid 1∶?1, the polymerization rate of glycerol was about 33.8%, and the polyglycerol was mainly composed of diglycerol. The addition of Zinc-based catalysts in the glycerol esterification process could increase the acid reduction rate and reduce the reaction time, reaction temperature and glycerol polymerization, and increase the recovery of glycerol. Compared with ZnCl2 and Zn(Ac)2, ZnO exhibited the best catalytic effect, and the polymerization rate of glycerol reduced to about 13% under the conditions of reaction temperature 180?℃, ZnO dosage 0.3% and molar ratio of glycerol to fatty acid 1∶?1. The results could improve the optimization of glycerol esterification technique and provide guidance for the development of biodiesel production from glycerol esterification coupled with base-catalyzed transesterification. |
| View full text View/Add Comment Download reader |
| Close |
|
|
|
