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Hydrophobically modified distillation membrane material of high throughout and high salt rejection rate and application thereof

A technology of hydrophobic modification and modified materials, which is applied in the field of membrane materials, can solve the problems of low water flux and achieve high stability, uniform modification process and high stability

Inactive Publication Date: 2014-03-12
何涛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention aims at the low water flux of current membrane materials and the wetting of membrane pores, converts hydrophilic or generally hydrophobic ultrafiltration or microfiltration membrane materials into hydrophobic distillation membranes through surface nano-modification, and uses nano-modification to solve the problem of modification The problem of pore blockage in the process can be improved, the flux of the membrane can be improved, and the anti-fouling performance of the membrane can be improved through the hydrophobic layer, so a hydrophobic modified distillation membrane material with high flux and high rejection rate is provided.

Method used

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  • Hydrophobically modified distillation membrane material of high throughout and high salt rejection rate and application thereof
  • Hydrophobically modified distillation membrane material of high throughout and high salt rejection rate and application thereof
  • Hydrophobically modified distillation membrane material of high throughout and high salt rejection rate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The asymmetric hydrophilic PES hollow fiber membrane (average pore size of 50 nm, contact angle of 0°) was placed in an oven at 40°C for 60 minutes, and then the membrane was placed in the plasma chamber, and the CF was used first. 4 (95%) and O 2 (5%) Plasma cleans and etches the film surface into a rough surface. The processing power is 200w, the time is 20min, and the pressure in the chamber is 180mTorr to obtain the etched film surface. Then pass into CF 4 Gas, when the pressure in the cavity reaches 200mTorr, the discharge generates plasma, the power is 100w, the time is 5min, and the pressure in the cavity is 300mTorr. After modification, the contact angle of the outer surface of the membrane was 150°, and the contact angle of the inner surface was 100°. The modified membranes were loaded into a module of a direct contact membrane distillation (DCMD) unit for testing. The feed liquid is 4 wt% NaCl aqueous solution, and the permeate is deionized water. When the...

Embodiment 2

[0040] As described in Example 1, the asymmetric hydrophilic PES hollow fiber membrane was dried in an oven at 50°C for 40 minutes, and placed in a plasma chamber after drying. The surface of the membrane was first etched and cleaned with Ar plasma. The treatment power was 300w, and the time For 30min, the pressure in the cavity is 200mTorr, to obtain the activated membrane surface, and then pass the C 4 F 8 Gas, when the pressure in the cavity reaches 200mTorr, the discharge generates plasma, the power is 100w, the time is 10min, and the pressure in the cavity is 200mTor. After modification, the contact angle of the outer surface of the membrane was 153°, and the contact angle of the inner surface was 102°. The modified membrane was used for the vacuum membrane distillation test, the feed liquid was 4wt% NaCl aqueous solution, the vacuum degree was 0.05MPa, and the flux was 78.8kg m when the feed liquid inlet temperature was 74.1°C and the permeate side inlet temperature was...

Embodiment 3

[0042] The asymmetric hydrophilic PES flat membrane (average pore size 150 nm, contact angle 0°) was placed in a 40°C oven to dry for 60 min, and then placed in a plasma chamber after drying, using O 2 The plasma will clean and activate the membrane surface, the processing power is 300w, the time is 10min, the pressure in the chamber is 200mTorr, take out, put the membrane in 0.5mM OTS solution, react at 10°C for 24h, take out the membrane and dry. After modification, the surface contact angle of the membrane was 136°, and the bottom surface contact angle was 130°. The modified membrane was subjected to the DCMD test as described in Example 1. When the inlet temperature of the feed liquid was 74.0 °C and the inlet temperature of the permeate side was 19.0 °C, the flux was 65.6 kg m -2 h -1 , after continuous operation for 10h, the flux did not decrease, and the retention rate was 100%.

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Abstract

The invention discloses a hydrophobically modified distillation membrane material of high throughout and high salt rejection rate and its application. For the material of the invention, ultrafiltration or microfiltration membrane materials are employed as the basic membrane material, the surface of which is subjected to cleaning and etching pretreatment by means of drying and plasmas. Then the surface of the basic membrane material is modified with a modification material by gas phase, liquid phase or plasma modification, thus obtaining the hydrophobically modified distillation membrane material of high throughout and high salt rejection rate. The invention discloses a novel hollow fiber membrane material with hydrophobic surface modification, and the membrane material is characterized by high throughout, high salt rejection rate and high stability. The distillation membrane material provided in the invention can be used for direct contact membrane distillation or sweeping gas membrane distillation or vacuum membrane distillation, and is applicable to the treatment of seawater, reverse osmosis concentrated wastewater and industrial wastewater, and the concentration of biomass solution, protein solution and fruit juice.

Description

technical field [0001] The invention belongs to the field of membrane materials, and in particular relates to a hydrophobically modified distillation membrane material with high flux and high salt rejection rate and its application. Background technique [0002] Water shortage, environmental pollution and energy crisis are major problems facing the world today. In the field of seawater desalination and sewage recycling, membrane materials have become a conventional separation technology. Among them, reverse osmosis membrane technology has been widely used. In the reverse osmosis process, the operating pressure is high and the energy consumption is also high. At the same time, the reverse osmosis process has a low recovery rate, and while obtaining pure water, a large amount of high-salt wastewater is produced, which brings secondary pollution to the environment. Therefore, the research on a new generation of green, low energy consumption and low pollution desalination tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/36C02F1/08
CPCY02W10/37
Inventor 何涛李雪梅魏星马宇春李晶姜标
Owner 何涛
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