Spray pipe, membrane spray device and membrane spray system for preparing tubular nanofiltration membrane

Abstract

The inventiondiscloses a spray pipe, a membrane spray device and a membrane spray systemfor preparing a tubular nanofiltration membrane. One end of the spray pipe is closed, and the other end is open;the spray pipe is internally and radially divided into a water phase area, an oil phase area and a hot air area which are not connectedcommunicated; micropores axially penetrates in the pipe wall ofthe spray pipe in each area. The membrane spray device for preparing the tubular nanofiltration membrane comprises the spray pipe, a power mechanism for driving the spray pipe to rotate, and a slidingsupport mechanism. The system for preparing the tubular nanofiltration membrane comprises a membrane fixing device, a membrane spray device, a feed device and a hot air device; a water phase medium and an oil phase medium are sprayed in turn to the inner wall of a tubular membrane for interfacial polymerization, through the feed device and the spray device; heat treatment is performed through thehot air device, so as to finish preparation of the tubular nanofiltration membrane. According to the spray pipe, the membrane spray device and the membrane spray system disclosed by the invention, the technical defect of traditional methods that interfacial polymerization easily occurs on the inner and outer walls of the tubular membrane at the same time during soaking is resolved; the dosage oftraditional Chinese medicine agents and the waste liquid amount are reduced in the interfacial polymerization process; meanwhile, the formed dense separation layer is thinner, and the membrane flux isincreased.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation system for preparing tubular nanofiltration membranes by an interface polymerization method. Background technique [0002] Nanofiltration (NF) is a pressure-driven membrane separation technology between ultrafiltration and reverse osmosis. The pore size of the nanofiltration membrane is 0.5-2 nm, the molecular weight cut-off is 200-1000 Dalton, and the operating pressure is 0.35-1.0 MPa. Due to the characteristics of low operating pressure, good selectivity to different valence ions and high rejection rate of small molecular organics, nanofiltration has been widely used in food, medicine, chemical industry and water treatment and other fields. [0003] In recent years, the preparation methods of nanofiltration membranes at home and abroad mainly include phase inversion method and composite method. Since the composite method has a higher degree of fre...

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Problems solved by technology

[0004] The existing nanofiltration membrane technology prepared by interfacial polymerization method adopts the immersion method, and the inner and outer walls of the tube membrane are prone to interfacial polymerization reaction at the same time, and the dense functional layer is formed by the reaction, which reduces the membrane flux; Cost and Waste Volume

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