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Citation: FENG Hai-Feng, JIANG Zhong-Yi, LI Duo, PAN Fu-Sheng. Pervaporation Separation of Benzene/Water Mixture by Modified PDMS Membrane[J]. Chinese Journal of Applied Chemistry, ;2003, 20(10): 932-935. shu

Pervaporation Separation of Benzene/Water Mixture by Modified PDMS Membrane

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072

Corresponding author: JIANG Zhong-Yi,
Received Date: 22 January 2003
Available Online: 5 June 2003
Fund Project: 中石化基金(X500003) (X500003)天津市自然科学基金重点项目资助(993802011) (993802011)

Prepolymer of methyl-triethoxysilicane is used as the crosslinker instead of tetraethyl orthosilane in this paper to prepare the dense polydimethylsiloxane(PDMS) membrane with higher methyl/Si molar ratio for the benzene/water mixture separation. The thickness of unswelling PDMS membrane is 140 μm. XRD shows crystalline content of the membrane is 18.72%. The contact angles of water and benzene on the membrane surface are 113.5° and 20°, respectively. The modified membrane is high hydrophobic. The effects of feed temperature, flow rate, feed concentration and the downstream side pressure on the separation performance of membrane during pervaporation process are evaluated. Experimental results indicate that the increase of the feed concentration, flow rate and feed temperature is in favor of the permeation flux and separation factor, the later increases and the permeation flux decreases with the increase of downstream pressure.
- pervaporation separation,
- benzene/water mixture,
- methyl-triethoxysilicane,
- polydimethylsiloxane membrane
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