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

A technology for hydrophobic modification and modification of materials, applied in the field of membrane materials, can solve problems such as low water flux, and achieve the effects of high stability, uniform modification process and high stability

Inactive Publication Date: 2011-11-02
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 th

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] Put the asymmetric hydrophilic PES hollow fiber membrane (average pore size 50nm, contact angle 0°) in a 40°C oven to dry for 60min, then put the membrane into the plasma chamber, first use CF 4 (95%) and O 2 (5%) plasma cleans and etches the surface of the membrane to a rough surface, the processing power is 200w, the time is 20min, and the pressure in the chamber is 180mTorr to obtain the etched membrane surface. Then pass into CF 4 Gas, when the pressure in the chamber reaches 200mTorr, discharge to generate plasma, the power is 100w, the time is 5min, and the pressure in the chamber is 300mTorr. After modification, the contact angle of the outer surface of the film was 150°, and that of the inner surface was 100°. The modified membranes were loaded into components of a direct contact membrane distillation (DCMD) device for testing. The feed liquid is 4wt% NaCl aqueous solution, and the permeate is deionized water. When the feed liquid inlet temperature is 73.5°C...

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. For 30min, the pressure in the chamber is 200mTorr, to obtain the activated membrane surface, and then pass into C 4 f 8 Gas, when the pressure in the chamber reaches 200mTorr, discharge to generate plasma, the power is 100w, the time is 10min, and the pressure in the chamber is 200mTorr. The contact angle of the outer surface of the modified film was 153°, and the contact angle of the inner surface was 102°. The modified membrane was used for vacuum membrane distillation test, the feed liquid was 4wt% NaCl aqueous solution, the vacuum degree was 0.05MPa, when the feed liquid inlet temperature was 74.1°C and the permeate side inlet temperature was 20.0°C, the flux was 78.8kg m -2 h -1 , the retention rate is 100%.

Embodiment 3

[0042] Put the asymmetric hydrophilic PES flat membrane (average pore size of 150 nm, contact angle of 0°) in an oven at 40°C for 60 min, put it into the plasma chamber after drying, and use O 2 The plasma will clean and activate the surface of the membrane. The processing power is 300w, the time is 10min, and the pressure in the chamber is 200mTorr. Take it out, put the membrane in 0.5mM OTS solution, react at 10°C for 24h, take out the membrane and dry it. The surface contact angle of the modified film 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 feed liquid inlet temperature was 74.0°C and the permeate side inlet temperature was 19.0°C, the flux was 65.6kg m -2 h -1 , After running continuously for 10 hours, the flux did not decrease, and the rejection 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 specifically relates to a hydrophobic 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 at present. In the fields 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 high. At the same time, the recovery rate of the reverse osmosis process is low. While obtaining pure water, a large amount of high-salt wastewater is produced, which brings secondary pollution to the environment. Therefore, research on a new generation of green, low-energy, and low-pollution desalination technologies has attra...

Claims

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Application Information

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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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