I hope that others appreciate this discussion as much as I have... By all of your input, I have learned a lot, and that is what I was hoping for. Thank you for your input on PTFE, PP and HDPE. US Plastics has a good assortment of them.
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Bullion.Forum
Pvs,Plastic,Teflon
- Thread starter Refiner232121
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Lou:
Your assessment of the different plastics has made a huge difference to me and I thank you. Having gotten a good dose of NOX fumes the first time I used that process, and now being very dedicated to preserving my own life and those I will work near, I heartily thank you, Lou.
Your assessment of the different plastics has made a huge difference to me and I thank you. Having gotten a good dose of NOX fumes the first time I used that process, and now being very dedicated to preserving my own life and those I will work near, I heartily thank you, Lou.
Glad to help. I just don't want people thinking they can use nylon with nitric acid and not have problems.
Lou said:
Lou: If you could advise I would appreciate your input. Intelligent Others your input is desired as well.
I bought this fan for my fume hood and scrubber
http://www.usplastic.com/catalog/item.aspx?itemid=23519&clickid=redirect
Because it is an 8 inch coupling required to connect to the housing of the fan, I am running into problems finding a HDPE pipe or fittings that will be resistant to the nitrogen dioxide fumes. For my Scrubber I have 1" HDPE pipe and HDPE male fittings (can only find PVC nuts to hold onto the lab hood) from the AR Fume hood/enclosed lab hood. I am really only finding either very expensive options or PVC options and there are only one or two places to buy a 8 inch to 6 or 4 inch reducers. All these are in PVC. Should I be worried about PVC failing if my scrubber is doing its job? How long would PVC last if exposed to NO2? Can it be cleaned or at the least kill any NO2 in the piping with a mild mix of water and lye? I am sorry that my questions may seem never ending. But this forum is great, and if I have questions I am sure that others should be thinking some of these things themselves. Otherwise, they may have gotten a good shot of NO2 and decided not to make this a hobby/business. For those that are thinking about making this a hobby, IT IS A DANGEROUS HOBBY. Thank you for your input, (in advance).
qst42know
Well-known member
I suspect you will get a reasonable lifespan from PVC.
http://www.vp-scientific.com/Chemical_Resistance_Chart.htm
PVC is used for plating tanks containing nitric acid solutions.
http://www.vp-scientific.com/Chemical_Resistance_Chart.htm
PVC is used for plating tanks containing nitric acid solutions.
I have seen these exact blowers used for assay hoods without any scrubbing of the fumes (nitric from parting) in use for over 10 years with no noticeable degradation. As laboratories are exempt from the scrutiny seen by refiners by the EPA they do not scrub their assay lab exhaust.
Well exempt as long as they're Conditionally Exempt Small Quantity Generator of hazmat waste, and even then, that depends on what they work with in their lab. Any more than 100 kg and they take notice and it keeps step with how much waste you make.
As for your question: that blower is exactly what you need. That's a smaller version of what's used in my 6' hoods.
Lou
As for your question: that blower is exactly what you need. That's a smaller version of what's used in my 6' hoods.
Lou
Thank you all for your input. Having had a few weeks of coughing from a good hit of NO2, I want to scrub the fumes very well. Not just for my sake, but for the rest of the community.
1. I understand that lye diluted should be used for the first scrub, exactly what is the output of that chemical reaction?
2. Also I have or read here that NO2 scrubbed with H2O and crushed marble will also give a positive result. True?
3. If there is a chlorine gas present can that be scrubbed with diluted peroxide?
Thank you for your straight answers.
1. I understand that lye diluted should be used for the first scrub, exactly what is the output of that chemical reaction?
2. Also I have or read here that NO2 scrubbed with H2O and crushed marble will also give a positive result. True?
3. If there is a chlorine gas present can that be scrubbed with diluted peroxide?
Thank you for your straight answers.
HAuCl4
Well-known member
http://www.gargscientific.com/ptfe.htm
Borrowing an idea from Irons on the universal digestor vessel made of teflon with a lid.
Maybe there is a supplier in the US for these PTFE vessels. I see they have up to a 10 liter size, more than enough for most refiners out there.
Can heat the acid in a microwave oven, pull it out and then drop the metal inside for digestion.
Borrowing an idea from Irons on the universal digestor vessel made of teflon with a lid.
Maybe there is a supplier in the US for these PTFE vessels. I see they have up to a 10 liter size, more than enough for most refiners out there.
Can heat the acid in a microwave oven, pull it out and then drop the metal inside for digestion.
I have quite a bit of PTFE and FEP labware. The FEP bottles are for storing high purity acids and solutions. I have some 2L PTFE bottles and pressure reactors. They're over $800 new per piece. A 10L reactor would be absurdly expensive!
Best thing to get for bulk is a glass lined Pfaulder or an Ambi as 4metals mentioned.
Best thing to get for bulk is a glass lined Pfaulder or an Ambi as 4metals mentioned.
HAuCl4
Well-known member
http://www.finemech.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=A136-14&Category_Code=f512&Product_Count=10
Here's a german supplier. 2 liter beaker $173. I bet chinese are even cheaper.
The Pfaudler reactor design is the one I like the most, but a deal is hard to find, and retail too expensive.
An all teflon near closed system is not hard to imagine. I'll post a design if I find the cheap pieces, for your review and consideration. 8)
Teflon reactor on a table, teflon acid heater in a microwave oven, vaccuum buchner funnel and precipitator/separation funnel, with some tubes and stopcocks and a simple scrubber. Something like this would be very durable and hassle and fume free.
Of course not for huge amounts, but I think for up to 50-100 Oz it would work quite nicely and trouble free.
Here's a german supplier. 2 liter beaker $173. I bet chinese are even cheaper.
The Pfaudler reactor design is the one I like the most, but a deal is hard to find, and retail too expensive.
An all teflon near closed system is not hard to imagine. I'll post a design if I find the cheap pieces, for your review and consideration. 8)
Teflon reactor on a table, teflon acid heater in a microwave oven, vaccuum buchner funnel and precipitator/separation funnel, with some tubes and stopcocks and a simple scrubber. Something like this would be very durable and hassle and fume free.
Of course not for huge amounts, but I think for up to 50-100 Oz it would work quite nicely and trouble free.
HAuCl4
Well-known member
Any shape made to order in PTFE. I imagine they will not be cheap.
http://www.ptfeparts.com/teflon-ptfe-labware.htm
P.S.: I got a quote from this people at $6250.00 each for a 21 liter vessel, quantity 3. I'd only pay that kind of money for a reactor if a customer insisted on teflon and ruled out other choices (like pvc, fiberglass/resin, etc.) I imagine the teflon vessels would outlive several generations of refiners however. :shock:
http://www.ptfeparts.com/teflon-ptfe-labware.htm
P.S.: I got a quote from this people at $6250.00 each for a 21 liter vessel, quantity 3. I'd only pay that kind of money for a reactor if a customer insisted on teflon and ruled out other choices (like pvc, fiberglass/resin, etc.) I imagine the teflon vessels would outlive several generations of refiners however. :shock:
