Alginic acid seawater desalination pretreatment technology and preparation of alginic acid compound salt fiber

A kind of alginic acid and pretreatment technology, applied in seawater treatment, ion exchange water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., to reduce the cost of seawater desalination technology, high hygroscopicity, and promote the effect of wound healing

Inactive Publication Date: 2018-06-19
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pretreatment process for seawater desalination of alginic acid and a preparation method of by-product alginic acid composite salt fiber for the deficiencies of the existing reverse osmosis membrane seawater desalination technology

Method used

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  • Alginic acid seawater desalination pretreatment technology and preparation of alginic acid compound salt fiber
  • Alginic acid seawater desalination pretreatment technology and preparation of alginic acid compound salt fiber
  • Alginic acid seawater desalination pretreatment technology and preparation of alginic acid compound salt fiber

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Embodiment 1

[0018] Dissolve alginic acid with a G-type content of 80% in the seawater pretreated by multi-effect filtration or mechanical filtration at a mass ratio of 100:3. Alginic acid interacts with sodium ions (Na + ), potassium ions (K + ), magnesium ions (Mg 2+ ), calcium ions (Ca 2+ ) ions combined to precipitate an alginate compound salt gel with a mass ratio of 7.1%, and the salt content of seawater dropped to 23500ppm. The extracted gel was prepared into fibers by gel spinning method, and dried at 60° C. to obtain alginic acid composite salt fibers. The moisture absorption rate of the fiber reaches 98%, the antibacterial rate against Escherichia coli reaches 28.5%, and the antibacterial rate against Staphylococcus aureus reaches 43.8%.

Embodiment 2

[0020] Dissolve alginic acid with a G-type content of 75% in the seawater pretreated by multi-effect filtration or mechanical filtration at a mass ratio of 100:4. Alginic acid interacts with sodium ions (Na + ), potassium ions (K + ), magnesium ions (Mg 2+ ), calcium ions (Ca 2+ ) ions were combined to precipitate an alginate compound salt gel with a mass ratio of 7.0%, and the salt content of seawater dropped to 24800ppm. The extracted gel was prepared into fibers by gel spinning method, and dried at 60° C. to obtain alginic acid composite salt fibers. The moisture absorption rate of the fiber reaches 97.5%, the antibacterial rate against Escherichia coli reaches 29.9%, and the antibacterial rate against Staphylococcus aureus reaches 44.3%.

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Abstract

The invention discloses an alginic acid seawater desalination pretreatment technology and preparation of an alginic acid compound salt fiber. The technology particularly comprises the following steps:dissolving a flocculant, namely alginic acid, in seawater after multiple-effect filtration or mechanical filtration pretreatment, and allowing alginic acid and sodium ions, potassium ions, magnesiumions and calcium ions in the seawater to be bonded via ion exchange and chelation to be precipitated in a form of alginic acid compound salt gel. The alginic acid compound salt fiber is prepared by preparing a fiber from the extracted gel according to a gel fiber-spinning method, and drying the fiber. The technology can effectively reduce a salt content of the seawater in a reverse osmosis membrane seawater desalination technology, alleviates the current high energy consumption situation caused by increase of seawater osmotic pressure and lowers energy consumption cost of the reverse osmosis membrane seawater desalination technology. In addition, the alginic acid compound salt gel precipitated in the seawater desalination pretreatment technology can be prepared into high added value medical alginate dressing, textile fibers and the like by deep processing, and the seawater desalination cost is further lowered.

Description

technical field [0001] The invention belongs to the field of seawater desalination technology and preparation of alginic acid fiber, and in particular relates to a pretreatment process of alginic acid seawater desalination and preparation of composite salt fiber. Background technique [0002] Most of the cost of reverse osmosis membrane seawater desalination technology comes from energy consumption (>50%) and membrane fouling damage to reverse osmosis membranes (>25%), resulting in high operating costs. The core bottleneck of its technology is the salinity concentration of untreated seawater, that is, the higher the salinity of seawater, the higher the osmotic pressure required, the more energy required, and the easier it is to cause membrane fouling. The average salt content of seawater is 35,000 ppm, compared with 1,000-2,000 ppm in general urban sewage, making the unit cost of reverse osmosis membrane seawater desalination technology remain high, and it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/56B01J20/24B01J20/28B01J20/30C02F103/08
CPCB01J20/24B01J20/28023C02F1/42C02F1/56C02F2103/08
Inventor 薛涵与娄本勇林棋叶远松
Owner MINJIANG UNIV
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