Hydrophobic porous silica aerogel composite membrane and vacuum membrane distillation method

摘要

A hydrophobic porous silica aerogel composite membrane for a vacuum membrane distillation device and a vacuum distillation method are disclosed. The vacuum membrane distillation device has a case and the hydrophobic porous silica aerogel composite membrane accommodated in the case to divide a chamber defined by the case into a feed part configured to feed a first fluid containing water molecules and a permeate part configured to collect a second fluid containing the water molecules. The hydrophobic porous silica aerogel composite membrane includes a porous aluminum oxide membrane that has a plurality of first pores with average pore diameter larger than 50 nm and a porous silica aerogel membrane that has a plurality of second pores of 2 to 50 nm and is formed on at least one side of the porous aluminum oxide membrane facing the feed part by methylmethoxysilane as a precursor and a sol-gel synthetic process.

主权项

1. A vacuum membrane distillation method, comprising:
providing a vacuum membrane distillation device having a case and a hydrophobic porous silica aerogel composite membrane accommodated in the case to divide a chamber defined by the case into a feed part and a permeate part, wherein the hydrophobic porous silica aerogel composite membrane has a porous aluminum oxide membrane and a porous silica aerogel membrane, the porous aluminum oxide membrane has a plurality of first pores, the average pore diameter of the first pores is larger than 50 nm, the porous silica aerogel membrane is formed on one side of the porous aluminum oxide membrane facing the feed part, the porous silica aerogel membrane has a plurality of second pores, the average pore diameter of the second pores is 2 to 50 nm, and the porous silica aerogel membrane is formed by methylmethoxysilane as a precursor and a sol-gel synthetic process; feeding a first fluid containing water molecules in the feed part; and evacuating the permeate part to collect a second fluid containing the water molecules.