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I am looking for a cost-effective way to remove acetone from wastewater. Our wastewater contains ppm-level concentrations of methylene chloride and acetone. Methylene chloride is removed via air stripping, but acetone remains due to its solubility in water.
We currently dispose this water in totes on a monthly basis, but I would prefer to remove the water to minimize the volume of waste disposed. Will ion exchange work, and if so, does anyone know of a preferred resin?
Regards,
Erich Zimmerman
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Acetone Separation
Started by ezimmer976, Jul 25 2003 10:00 AM
5 replies to this topic
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#2
ShaunHill
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Posted 25 July 2003 - 11:47 AM
I don't believe ion exchange will remove acetone from water. Acetone is not an ioninc compound.
You could try heating it, boiling point of Acetone is less than 60C at atmospheric pressure. However, if you have a lot of water this might not be very economic. You would want to check the amount of heat required to see if this is practical.
Other than that, you could look into reverse osmosis, the acetone molecule is larger than the water molecule.
I would recommend calling some vendors of RO membranes and see if they can comment on removal of acetone. I haven't seen it done, but it makes sense that it should work.
You could try heating it, boiling point of Acetone is less than 60C at atmospheric pressure. However, if you have a lot of water this might not be very economic. You would want to check the amount of heat required to see if this is practical.
Other than that, you could look into reverse osmosis, the acetone molecule is larger than the water molecule.
I would recommend calling some vendors of RO membranes and see if they can comment on removal of acetone. I haven't seen it done, but it makes sense that it should work.
#3
Guest_Guest_*
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Posted 25 July 2003 - 12:28 PM
Dear ezimmer976:
Try looking into pervaporation. There is an excellent article about it elsewhere in this "ChE Resource Page" website. If I remember correctly, there are specific membranes for removing organics from water. From my previous pervap experience, you will toss out some volume of water with your acetone and MeCl. Compare this (reduced) volume of water to current practice, and also compare to what you would get with RO. (If I understand the technologies correctly, water would have to permeate through the membrane in RO, whereas a very limited amount of organics would permeate through the membrane in pervap. This leads to much smaller equipment size and cost.)
Try looking into pervaporation. There is an excellent article about it elsewhere in this "ChE Resource Page" website. If I remember correctly, there are specific membranes for removing organics from water. From my previous pervap experience, you will toss out some volume of water with your acetone and MeCl. Compare this (reduced) volume of water to current practice, and also compare to what you would get with RO. (If I understand the technologies correctly, water would have to permeate through the membrane in RO, whereas a very limited amount of organics would permeate through the membrane in pervap. This leads to much smaller equipment size and cost.)
#4
siretb
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Posted 30 July 2003 - 01:54 AM
I agree that ion exchange is not a solution, ion exchange is for removing ions, salts, ...
Since we are talking of ppm levels, why not consider a static bed of activated carbon, where you'd either dispose of the spent carbon or steam regenerate it and recover the solvants by distillation?
I am not sure pervaporation is an economical solution, because pervaporation operates on vapors. You still have to spend a lot of energy, even if it's less than for a regular distillation.
Also, since you have methylene chloride, may be solvant extraction would work. I do not know the partition coefficient you'll get for the aceton, but that'sd probably worth a pass of calculations.
Since we are talking of ppm levels, why not consider a static bed of activated carbon, where you'd either dispose of the spent carbon or steam regenerate it and recover the solvants by distillation?
I am not sure pervaporation is an economical solution, because pervaporation operates on vapors. You still have to spend a lot of energy, even if it's less than for a regular distillation.
Also, since you have methylene chloride, may be solvant extraction would work. I do not know the partition coefficient you'll get for the aceton, but that'sd probably worth a pass of calculations.
#5
montu lakhani
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Posted 01 August 2003 - 09:59 AM
[FONT=Times][SIZE=7][COLOR=blue] dear fren
u can go for distillation , but it may be little costly if you have any process and design problem you can contact me .
my mail id is montu_lakhani@yahoo.com
have good day
montu
#6
Pervaporation
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Posted 17 September 2003 - 10:11 AM
Sulzer is a supplier of pervaporation units. One of our customers is running a pilot plant for the separation of acetone out of water with membranes. You could send a mail to me and I would pass your enquiry to them.
SULZER membrane systems, Pierre.strauch@sulzer.com
SULZER membrane systems, Pierre.strauch@sulzer.com
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