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

Abstract

The invention discloses a nozzle for preparing a tubular nanofiltration membrane, a membrane spraying device and a system. One end of the nozzle is closed, and the other end is open. The inside of the nozzle is radially divided into water-phase regions, oil-phase regions and hot-air regions that do not communicate with each other. The walls of the nozzles in each region are axially penetrated with micropores. The membrane spraying device for preparing the tubular nanofiltration membrane comprises the above-mentioned spray tube, a power mechanism and a sliding support mechanism for driving the spray tube to rotate. The system for preparing tubular nanofiltration membranes includes a membrane fixing device, a membrane spraying device, a feeding device and a hot air device. The water phase medium and the oil phase medium are sprayed onto the inner wall of the tubular membrane through the feeding device and the spraying device for interfacial polymerization. , heat treatment through a hot air device to complete the preparation of the tubular nanofiltration membrane. The invention solves the technical defect of the traditional method that the inner and outer walls of the tube membrane are prone to interfacial polymerization at the same time during the soaking process; reduces the amount of medicament used and the amount of waste liquid in the interfacial polymerization process, and forms a thinner dense separation layer at the same time, increasing the membrane flux.

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 membr...

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