Application of Membrane Deliquoring Technology in Ginkgo Biloba Extract Production

Abstract

To displace the original vacuum hypothermia triple effect evaporation technology, save energy, and enhance product activity, nanofiltration technology is applied in getting rid of most solvent of macro porous resin eluent, which is generated in producing Gingko biloba extract. Membrane K and membrane L are studied systematically in this experiment. The results indicate that permeate flux increases with the accretion of operating pressure, operating temperature, and recycle flux, and decreases with the increase of feed concentration. An increased operating pressure and recycle flux resulted in a decreased permeate concentration, and increased operating temperature and feed concentration lead to an increased permeate concentration. Active components content in permeate almost does not change with operating condition. However, the cutoff ratio is about 99%, which can meet the need of production. Optimized operating condition was assured and small field experiment was done. It was shown that nanofiltration membrane technology could effectively eliminate solvent of macro porous resin eluent. Elementary estimation indicates that nanofiltration membrane technology can reduce 90% energy and 70% cost over the original technology.

Keywords:

• Condensation
• Eluent
• Nanofiltration membrane technology
• Operating condition

Notes

Water flux J _w is measured under 0.4 MPa. MWCO are provided by the membrane manufacturer.