Process for dewatering an aqueous organic solution

a technology of organic solution and process, applied in the direction of filtration separation, separation process, membrane, etc., can solve the problem of high energy consumption of processes

Inactive Publication Date: 2010-06-24
CHEVROU USA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Process for dewatering an aqueous organic solution
  • Process for dewatering an aqueous organic solution
  • Process for dewatering an aqueous organic solution

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[0047]To estimate the energy savings of the invention, a hypothetical reservoir is assumed to be an open evaporation pond located in an area with plenty of sunshine and the following average climatic conditions:

Relative Humidity (%)52.6Average Temperature (° C.)18.6Average Wind speed (m / s)2.84

[0048]The draw solution is a 20 wt % solution of magnesium chloride in water. Absorbed solar energy leads to a rise in the temperature of the draw solution. FIG. 2 shows the change in evaporation rate with change in temperature on the water surface. FIG. 2 indicates that by allowing solar heating to raise the temperature of water surface to 50° C., approximately 540 mL / hr / cm2 of water can be removed. The pond area was determined by the surface area needed to evaporate water sufficient to attain draw solution concentration of 5M MgCl2 in water.

[0049]A cellulose triacetate membrane is used in the osmosis process. The membrane is assumed to be impermeable to ethanol. A water / ethanol separation fac...

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Abstract

An energy-efficient process for dewatering an aqueous organic solution includes using freely available solar energy to concentrate a draw solution within a reservoir. The draw solution is used in conjunction with a membrane to remove water from the organic solution in a forward osmosis process. The draw solution is diluted by the osmosis process, and returned to the reservoir to be re-concentrated and reused in the osmosis process.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a process for dewatering an aqueous organic solution.[0002]Processes are known for producing high concentration organic solutions such as alcohols useful in the production of alternative fuels. For instance, ethanol suitable for blending with gasoline generally has a concentration of between about 95% and about 100% ethanol by weight and less than about 1% water by volume. Known processes for dewatering ethanol solutions to achieve suitable concentrations include conventional distillation of a fermentation broth to raise the concentration of the broth, until an azeotropic solution is formed. For example, the concentration of ethanol in the broth may be raised using conventional distillation until an azeotrope is formed. The distillation process can be followed by further processing to further remove water from the solution. Such further processing includes distilling at lower than atmospheric pressure in order to derive more ...

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Application Information

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IPC IPC(8): B01D61/02B01D61/08B01D61/10
CPCB01D61/002B01D2313/36B01D61/005C07C29/76C07C31/08Y02P20/10Y02P20/50
Inventor HUSAIN, SHABBIRPRAKASH, PRAKHAR
Owner CHEVROU USA INC
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