A kind of tubular membrane preparation method for membrane distillation

A tubular membrane and membrane distillation technology, which is applied in the fields of nanofiber tubular membrane preparation, tubular membrane preparation, and electrospinning tubular membrane preparation, can solve the problems of high operating cost, difficult control, and difficult control of membrane preparation conditions.

Inactive Publication Date: 2011-12-21
北京承峰纳泰科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of conventional methods for preparing tubular membranes: 1. High equipment investment and high operating costs
2. Compared with the plate membrane module, the preparation conditions of the membrane are more difficult to control, and the nozzle sealing is more difficult
3. Tubular membrane has low porosity and is not easy to control

Method used

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  • A kind of tubular membrane preparation method for membrane distillation
  • A kind of tubular membrane preparation method for membrane distillation
  • A kind of tubular membrane preparation method for membrane distillation

Examples

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example

[0009] Dissolve PVDF with a molecular weight of 600,000 in a mixed solvent of DMF and acetone, and the concentration is 10 g of PVDF in every 100 ml of mixed solvent. In order to obtain a membrane with high porosity, the volume ratio of the mixed solvent to DMF is 60%. Stir at a constant temperature of 40°C to best extend the PVDF molecules in the mixed solvent. The viscosity of the solution was measured with a rotational viscometer. When the viscosity reached the maximum, it indicated that the macromolecular PVDF molecules were stretched optimally in the mixed solvent. At this point the solution is ready for use and enters the electrospinning operation. Electrospinning was performed when the operating room temperature reached 30°C and the humidity was below 40%. Adjust the rotation speed of the central round roller 1 to make the film deposited on the support tube uniform. Adjust the rotational speed of the circular support 3 so that the film thickness deposited on each sup...

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Abstract

The invention relates to a preparation method of a tubular membrane for membrane distillation, and relates to a preparation method of a nanofiber tubular membrane. Aiming at the shortcomings of conventional preparation methods of tubular membranes, the present invention proposes a membrane preparation scheme with low equipment investment, simple and easy operation, and high porosity of the prepared tubular membranes. In this scheme, a solution of a polymer material suitable for membrane distillation is sprayed on a tubular support by the electrospinning method to form a tubular uniform membrane layer. The equipment is an electrospinning tubular film preparation device, and the film receiving system is a plurality of supporting tubes that rotate respectively. The support tubes are arranged around the surface of a central circular roller and are held against the surface. A circular bracket supports and defines both ends of the support tube. The rotation of the central round roller drives the support tube to rotate relative to the circular bracket, the circular bracket rotates concentrically relative to the central round roller, and electrospinning forms a uniform nanofiber tubular film on the support tube.

Description

technical field [0001] The invention relates to a method for preparing a tubular membrane for membrane distillation, a method for preparing an electrospinning tubular membrane, and a method for preparing a nanofiber tubular membrane, belonging to the fields of membrane science, membrane material preparation and membrane distillation. technical background [0002] With the development of industry and science and technology, membrane technology has become more and more widely used in many fields. Membrane modules include plate and frame type, tubular type, hollow fiber type, spiral wound type, etc. Tubular membrane modules are widely used because they can effectively control concentration polarization, have good flow conditions, and can adjust the flow rate in a wide range; the membranes are easy to clean after fouling is generated; and they do not require high pretreatment of feed liquid. Conventional tubular membrane preparation methods can be seen in textbooks, such as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/02B05D7/00D01D5/00C08J5/18
Inventor 刘钢刘冉
Owner 北京承峰纳泰科技有限公司
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