Membrane for membrane distillation and related membrane process based on aerogel

An aerogel and membrane distillation technology, which is used in the fields of environmental protection, petroleum industry, water treatment, and biopharmaceuticals, can solve the problems of energy waste, low thermal conductivity, high thermal efficiency, and reduced thermal efficiency, and achieves a wide range of materials, controllable structure, and improved Effects of Flux and Thermal Efficiency

Inactive Publication Date: 2010-09-15
张鹏 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, low thermal conductivity can achieve high thermal efficiency of MD - due to the direct contact between the thermal working medium and the membrane material in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Hydrophobic silica aerogels are airgel MD flat sheet membranes for membrane distillation. The thermal conductivity of the airgel MD film is 0.04W / m.K, the porosity is 90%, the average pore diameter is 200nm, and the film thickness is 200μm. The warm side is a 3% NaCl solution at a temperature of The cold side is pure water, the temperature is The flux is 53kg / m 2 h, the thermal efficiency is 73%.

Embodiment 2

[0019] Silica airgel / PVDF composite membrane module is used for osmotic distillation. The thermal conductivity of the airgel composite MD membrane is 1.52W / m.K, the porosity is 81%, the average pore diameter is 200nm, the membrane thickness is 380μm, the membrane module is in the form of hollow fiber, the total volume is 0.6L, and the surface area is 1.4m 2 . 55% CaCl 2 The solution is the extract phase (salt solution), concentrated 8.5°Brix clarified orange juice at room temperature, and the feed rate is 60L / h. The concentrated concentration of orange juice reaches 62°Brix, and the maximum membrane flux is 4.1kg / m 2 h.

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PUM

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Abstract

The invention provides a novel membrane material for membrane distillation. The membrane material has the remarkable characteristics of high throughout and high heat efficiency in the membrane distillation and related membrane process on the basis of unique structure property of the aerogel. The membrane material comprises the following contents: (1) the membrane material can take a single aerogel membrane as an MD (Membrane Distillation) membrane and can be also a composite aerogel MD membrane which is formed after the aerogel and other membrane materials are compounded; (2) the form of the aerogel MD membrane can be a flat membrane, a spiral roll-type membrane, a tubular membrane, a hollow fiber membrane or a capillary membrane; and (3) the aerogel MD membrane can be used for membrane distillation and any related membrane process and is characterized in that mass transfer mechanisms are both that a water solution is blocked by the membrane, and water vapor or steam of volatile components can permeate through membrane holes. The invention greatly improves the throughout and the heat efficiency in the membrane distillation and related membrane process by utilizing the unique structure characteristics of the aerogel.

Description

Technical field [0001] The invention belongs to the fields of water treatment, biological pharmacy, environmental protection, petroleum industry and the like. It involves the separation, concentration and purification technology of materials, especially the research on membrane materials for the purpose of realizing high-flux, high-thermal-efficiency membrane distillation and related membrane processes. Background technique [0002] Membrane distillation (Membrane Distillation, MD) is a membrane separation process that combines membrane technology and evaporation process. The process uses a hydrophobic microporous membrane and uses the vapor pressure difference on both sides of the membrane as the driving force. Membrane distillation has high rejection rate (if the membrane is not wetted, it can reach 100%), low operating temperature (it can effectively use cheap energy such as geothermal heat and industrial waste heat to reduce energy consumption), low operating pressure, a...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D69/00B01D71/00
CPCB01D2325/50
Inventor 张鹏杜如虚刘亚
Owner 张鹏
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