China University of Petroleum

Qingshan Jason Niu

Peng Li

Yang Xu

Yiyu Li

Bingbing Yuan

Yingfei Hou

Congcong Chen

Haixiang Sun

Tao Yuan

Mumin Wang

The present invention relates to the field of composite membrane and discloses a polyurethane/polyvinylidene fluoride composite membrane for extracting organic sulfide from naphtha. The polyurethane/polyvinylidene fluoride composite membrane includes an active layer and a support layer where the active layer is a polyurethane casting membrane and the support layer is a polyvinylidene fluoride membrane. The polyurethane/polyvinylidene fluoride composite membrane is prepared by coating the active layer onto the support layer. At the same time, a preparation method for the polyurethane/polyvinylidene fluoride composite membrane is disclosed. The present invention has the following beneficial effects: the polyurethane/polyvinylidene fluoride composite membrane prepared in the present invention may be used to extract organic sulfide in naphtha with high separation efficiency. Further, the composite membrane almost does not change the octane number and the like of the raw material oil, thereby improving the extraction rate of the organic sulfide.

Polyurethane/polyvinylidene fluoride composite membrane for extracting organic sulfide from naphtha and preparation method therefor

The present invention discloses a highly selective alicyclic polyamide nanofiltration membrane and a making method thereof. The method comprises the following steps: alternately and uniformly coating at least an alicyclic acid chloride solution and at least an alicyclic amine solution on a porous support membrane, using a spin coating method or a soaking method, to form at least one layer of the alicyclic polyamide nanofiltration membrane. Preferred embodiments exhibit improved ion selectivity, e.g. increased water flux, enhanced divalent/monovalent rejection selectivity, reduced fouling and improved divalent rejection rate (Ca, Mg) compared to the traditional aromatic-alicyclic mixed-structure polyamide nanofiltration membrane and/or the whole aromatic polyamide nanofiltration membrane. Therefore, the alicyclic polyamide nanofiltration membranes made in the present invention has great application prospect in the fields of zero-liquid discharge of industrial wastewater, water softening, and produce water treatment, etc.

Highly selective alicyclic polyamide nanofiltration membrane and making method thereof

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Qingdao, China

Qingshan Jason Niu