Zeolite membrane and methods of making and using same for water desalination

一种沸石膜、水脱盐的技术，应用在化学仪器和方法、膜、膜技术等方向，能够解决成本高等问题

Inactive Publication Date: 2012-05-02
HEADWATERS NANOKINETIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale desalination typically requires large amounts of energy as well as dedicated and expensive infrastructure, making it prohibitively expensive compared to using fresh water from rivers or groundwater

Method used

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  • Zeolite membrane and methods of making and using same for water desalination
  • Zeolite membrane and methods of making and using same for water desalination
  • Zeolite membrane and methods of making and using same for water desalination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Manufacture of silicalite-1 film

[0058] Example 1 describes a method of making a silicalite zeolite membrane suitable for water desalination. To 8 ml TEOS was added TPAOH solution (16 g; 15.4%) in a Teflon-lined autoclave at 140°C. After 24 hours, MFI (silicalite) nano-seeds with a size of 150 nm were obtained. By mixing seed particles with water and using NH 3 Aqueous solution The pH of the solution was adjusted to 10 to prepare a suspension (20 g / L) of zeolite seed particles. Adjusting the pH to 10 helps prevent seed particles from clumping together in suspension.

[0059] A coarse glass frit with a pore size of 20 μm was used as a support and washed 5 times with deionized water under ultrasonic oscillation and dried at 85 °C. The frit is then wetted and then immediately coated with the seed suspension by dropwise addition. Only a small amount of seed suspension is required, and the aqueous layer evaporates quickly to leave only a seed deposit on the...

Embodiment 2

[0061] Example 2: Water Desalination Using Membranes

[0062] Example 2 describes a method of using the membrane of Example 1 for seawater desalination using reverse osmosis. A number of membranes fabricated according to the method of Example 1 were tested using reverse osmosis. The reverse osmosis experiments were performed at room temperature and standard atmospheric pressure. Preparation containing 3.5% NaCl, KCl, CaCl 2 , MgCl 2 The solution. The filtrate was analyzed by ICP for ion content. Measure the amount of permeate by weighing the liquid nitrogen cold trap before and after infiltration. Each separation experiment was performed for about 7-8 hours. After the separation experiment, the membrane was washed with distilled water and dried for the next experiment. Separation characteristics can be defined in terms of flux and cation rejection as follows: flux = P / (S x T), cation rejection (R) = (C 进料 -C 渗透物 ) / C 进料 , where P represents the amount of permeate (Kg)...

Embodiment 3

[0065] Example 3: Using membranes to treat simulated seawater

[0066] Example 3 describes a method of using the membrane of Example 1 for seawater desalination using reverse osmosis. Example 3 was carried out under the same conditions as in Example 2, except that different salt concentrations were used in the feed. Specifically, the salt concentration in the feed of Example 3 mimics naturally occurring seawater. The results are shown in Table 2.

[0067] Table 2

[0068] ion type

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PUM

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Abstract

A novel zeolite membrane is manufactured using zeolite seeds that are deposited on a support material. The seeds are then further grown in a secondary growth step to form a membrane with inter-grown particles. The pore size of the zeolite membrane is in a range between 3 angstrom and 8 angstrom, which allows water to flow through the membrane at a relatively high flux rate while excluding dissolved ions. The novel zeolite membrane is surprisingly efficient for desalinating sea water using reverse osmosis. The zeolite membrane is capable of high rates of water flux rate and high percentage of ion rejection.

Description

technical field [0001] The invention relates to a zeolite membrane, a preparation method thereof and an application of the zeolite membrane for water desalination. Background technique [0002] Fresh water supply has been a huge concern for a considerable part of the world's people. Natural freshwater resources are finite and variable. In parts of the world, fresh water scarcity and / or erratic fresh water supplies have led to the development of large-scale water desalination plants that remove salt from seawater to produce fresh water. Large-scale desalination typically requires large amounts of energy as well as dedicated and expensive infrastructure, making it prohibitively expensive compared to using fresh water from rivers or groundwater. [0003] Large-scale desalination projects often use reverse osmosis to remove salt from seawater or brackish water. Seawater reverse osmosis works by using pressure to force seawater through a membrane. The membrane retains the sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D61/02
CPCB01D71/028B01D61/025B01D67/0051B01D2325/04C02F1/441C02F2103/08B01D69/10B01D2325/02Y02A20/131B01D69/108B01D71/0281B01D2325/0283
Inventor 朱广山邱世伦邱赫周冰
Owner HEADWATERS NANOKINETIX INC
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