Method for increasing positive permeation performance by using ferric lactate complex as draw solution

A complex and ferric lactate technology, which is applied in the field of environmental pollution control engineering, can solve the problems of low water flux, and achieve the effects of low preparation cost, reduced concentration polarization, and low cost

Active Publication Date: 2017-01-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogel extracts can completely avoid reverse osmosis, but their water flux is much lower than that of inorganic salt extracts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of iron lactate complex: Take 0.2mol of sodium lactate and add it into a 500ml single-necked flask filled with 50ml of deionized water, heat to 60°C, stir, and mix the solution evenly. Take 0.05mol Fe respectively 2 (SO 4 ) 3 and 0.05mol Na 2 SO 4 Add 100ml of deionized water each, stir to dissolve, then add the two solutions dropwise into the sodium lactate solution at the same time, stir vigorously, after the dropwise addition is complete, the temperature rises to 80°C, and stir for 6 hours. The solution after the reaction was cooled to room temperature, and the reaction solution was evaporated and concentrated to 1 / 5 of the original volume using a rotary evaporator. Pour the concentrated solution into cold ethanol to precipitate a light green solid, filter it with suction, and rinse it repeatedly with cold ethanol until the filtrate is colorless. Afterwards, the solid was taken out and reprecipitated with a mixture of ethanol and water (ethanol / water...

Embodiment 2

[0017] Preparation of iron lactate complex: Take 0.2mol of sodium lactate and add it into a 500ml single-necked flask filled with 50ml of deionized water, heat to 60°C, stir, and mix the solution evenly. Take 0.05mol Fe respectively 2 (SO 4 ) 3 and 0.05mol Na 2 SO 4 Add 100ml of deionized water each, stir to dissolve, then add the two solutions dropwise into the sodium lactate solution at the same time, stir vigorously, after the dropwise addition is complete, the temperature rises to 80°C, and stir for 6 hours. The solution after the reaction was cooled to room temperature, and the reaction solution was evaporated and concentrated to 1 / 5 of the original volume using a rotary evaporator. Pour the concentrated solution into cold ethanol to precipitate a light green solid, filter it with suction, and rinse it repeatedly with cold ethanol until the filtrate is colorless. Afterwards, the solid was taken out and reprecipitated with a mixture of ethanol and water (ethanol / water...

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Abstract

The invention provides a method for increasing positive permeation performance by using a ferric lactate complex as a draw solution, and belongs to the technical field of environmental pollution control engineering. The ferric lactate complex is prepared through a mild-condition one pot method, and the ferric lactate complex is applied to a positive permeation technology serving as the draw solution and is used for increasing the performance of the process. Due to structural characteristics of the ferric lactate complex, the ferric lactate complex prepared in the invention has higher water flux and lower reverse salt flux; meanwhile, the source of raw materials is wide, the cost is low, the preparation condition is mild, the toxicity is low, the membrane compatibility is good, and the recovery rate of the draw solution is higher, so that by using the ferric lactate complex as the draw solution, positive permeation can be effectively increased, and wider application of the positive permeation technology can be promoted through further study on the draw solution.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control engineering, and relates to the research on using a lactic acid complex as a drawing solution in a forward osmosis process, in particular to the research on seawater desalination. Background technique [0002] Forward osmosis is a membrane separation process driven only by osmotic pressure. Water molecules spontaneously permeate through a semi-permeable membrane from the raw material part with high water chemical potential to the draw liquid part with low water chemical potential, which can be used to extract drinking water from sewage or seawater. water. Compared with reverse osmosis, which can also be used to extract drinking water, forward osmosis uses osmotic pressure as the driving force, no external pressure is required, and the energy consumption of drawing water is reduced; the water recovery rate is high; the tendency of membrane fouling is small, and the system ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
CPCC02F1/445
Inventor 张捍民于明川
Owner DALIAN UNIV OF TECH
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