| 초록 |
Waste coffee grounds and scallop shells were recycled as lipid-resource and solid catalysts for biodiesel production. Three processes, an one-step direct process (OSDP), a novel OSDP employing cartridge containing solid catalysts (C-OSDP), and a conventional two-step process (TSP), were compared each other. The catalyst requirement of TSP was similar to that of OSDP. For C-OSDP, a larger amount of solid catalysts was required, but they were readily reused. TSP and OSDP required approximately 6 and 2 times larger loading of methanol than C-OSDP. TSP required almost two times larger amount of n-hexane than C-OSDP. C-OSDP required about 10% higher temperature than TSP and OSDP. C-OSDP required approximately 45% longer operation time than OSDP. For TSP, an extra time for lipid extraction,refining and cleanup was required. For C-OSDP, higher agitation speed was required to minimize or avoid mass transfer limitation. For actual biodiesel yield, TSP was highest, followed by OSDP and C-OSDP. |
