Need some chemist help - anyone? | |
Travis Bickle Vigilantes need love too.... User ID: 26788702 United States 12/03/2012 08:14 PM Report Abusive Post Report Copyright Violation | I was wondering how much Ammonium nitrate is required per liter of water to drop the temperature, and how much will it actually drop the temp to - freezing? Also, is ammonium nitrate toxic, can you get a food grade, etc? Finally, with all the security these days, can you buy small amounts from a chem house or hobby store or do you need permits and crap? Trying to figure out a way to drop water temps on a prototype item I am constructing, and temperature has become an issue for one device in general... thanks!! Quoting: Anonymous Coward 3558872 It seems to me that you're some kind of inventor who really has no chemical or scientific background.... Maybe you should team up with a local chemical engineer or even Chemistry teacher to bounce ideas off of. The reason I say this that you offer no volume information what so ever, so there can either be no answer to your question or a multitude of answers, accounting for the volume and temperature variables. Using NH4NO3 as a coolant is not very efficient, and the resulting dilution is mildly/moderately toxic if ingested. How much water are you trying to cool and to what temperature? Last Edited by Travis Bickle on 12/03/2012 09:41 PM One of these days... A *REAL* rain is gonna come and wash all this scum off the streets. |
Anonymous Coward User ID: 29027413 Netherlands 12/03/2012 08:29 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward (OP) User ID: 3558872 United States 12/04/2012 04:45 PM Report Abusive Post Report Copyright Violation | I was wondering how much Ammonium nitrate is required per liter of water to drop the temperature, and how much will it actually drop the temp to - freezing? Also, is ammonium nitrate toxic, can you get a food grade, etc? Finally, with all the security these days, can you buy small amounts from a chem house or hobby store or do you need permits and crap? Trying to figure out a way to drop water temps on a prototype item I am constructing, and temperature has become an issue for one device in general... thanks!! Quoting: Anonymous Coward 3558872 It seems to me that you're some kind of inventor who really has no chemical or scientific background.... Maybe you should team up with a local chemical engineer or even Chemistry teacher to bounce ideas off of. The reason I say this that you offer no volume information what so ever, so there can either be no answer to your question or a multitude of answers, accounting for the volume and temperature variables. Using NH4NO3 as a coolant is not very efficient, and the resulting dilution is mildly/moderately toxic if ingested. How much water are you trying to cool and to what temperature? Thanks. Maybe I can find a local chemist at the uni. Not that much water, probably, 8 oz max. Need a way to chill water peridocally without the use of power. Temperature of water will run from ambient to approx 150 degrees before it needs to be cooled down as far as possible, preferabbly ambient or less. Do you have any ideas on coolants that I can look at before talking to a chemist? Trying to get some ideas to see if plausible before spending all that time and money (which is tight). Thanks. |
Travis Bickle Vigilantes need love too.... User ID: 26788702 United States 12/04/2012 07:31 PM Report Abusive Post Report Copyright Violation | I was wondering how much Ammonium nitrate is required per liter of water to drop the temperature, and how much will it actually drop the temp to - freezing? Also, is ammonium nitrate toxic, can you get a food grade, etc? Finally, with all the security these days, can you buy small amounts from a chem house or hobby store or do you need permits and crap? Trying to figure out a way to drop water temps on a prototype item I am constructing, and temperature has become an issue for one device in general... thanks!! Quoting: Anonymous Coward 3558872 It seems to me that you're some kind of inventor who really has no chemical or scientific background.... Maybe you should team up with a local chemical engineer or even Chemistry teacher to bounce ideas off of. The reason I say this that you offer no volume information what so ever, so there can either be no answer to your question or a multitude of answers, accounting for the volume and temperature variables. Using NH4NO3 as a coolant is not very efficient, and the resulting dilution is mildly/moderately toxic if ingested. How much water are you trying to cool and to what temperature? Thanks. Maybe I can find a local chemist at the uni. Not that much water, probably, 8 oz max. Need a way to chill water peridocally without the use of power. Temperature of water will run from ambient to approx 150 degrees before it needs to be cooled down as far as possible, preferabbly ambient or less. Do you have any ideas on coolants that I can look at before talking to a chemist? Trying to get some ideas to see if plausible before spending all that time and money (which is tight). Thanks. I'm assuming here that you're talking about 150 Fahrenheit and not Celsius. The problem your going to run into with Endothermic reactions of any kind is that they are short lived and not renewable. You would need a constant supply of chemicals and provide a way to deal with the waste. The endothermic reaction is an absorption of energy (heat) to complete the chemical process: NH4NO3 + H2O ----> NH4OH + HNO3 So mixing water and Ammonium Nitrate results in a solution of ammonium ions, nitrate ions, ammonia, and acid protons. Once that process is complete, it's done. You may want to look at a Peltier cooler to suit your needs, but it will require power. Last Edited by Travis Bickle on 12/04/2012 07:32 PM One of these days... A *REAL* rain is gonna come and wash all this scum off the streets. |
Anonymous Coward (OP) User ID: 3558872 United States 12/04/2012 07:38 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 1499591 Netherlands 12/04/2012 07:39 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 22323395 United States 12/04/2012 07:42 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 20679797 United Kingdom 12/04/2012 07:42 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward (OP) User ID: 3558872 United States 12/04/2012 07:43 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 25390958 United States 12/04/2012 07:49 PM Report Abusive Post Report Copyright Violation | I was wondering how much Ammonium nitrate is required per liter of water to drop the temperature, and how much will it actually drop the temp to - freezing? Also, is ammonium nitrate toxic, can you get a food grade, etc? Finally, with all the security these days, can you buy small amounts from a chem house or hobby store or do you need permits and crap? Trying to figure out a way to drop water temps on a prototype item I am constructing, and temperature has become an issue for one device in general... thanks!! Quoting: Anonymous Coward 3558872 for your purposes this is simple. Since the instant cold packs are water and the evil oxidizer. buy one and measure the water and chemical components and scale it up. Be cautious as not all instant cold packs use the evil oxidizer. And just so you know, the solution can burn sensitive skin |
Anonymous Coward User ID: 25390958 United States 12/04/2012 07:50 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 25390958 United States 12/04/2012 07:54 PM Report Abusive Post Report Copyright Violation | |
Travis Bickle Vigilantes need love too.... User ID: 26788702 United States 12/04/2012 08:02 PM Report Abusive Post Report Copyright Violation | just so you know, you can use the used instant cold packs as the excellent fertilizer it is. It's not a chemical reaction that changes anything from what it was, it remains water and fertilizer 0-0-34 Quoting: Anonymous Coward 25390958 Ummm... NO! Fertilizer & Water |-------------------------------| NH4NO3 (Ammonium Nitrate) + H2O Mix them together and you get: Ammonium Hydroxide & Nitric Acid |----------------------| NH4OH + HNO3 in an Aqueous soution. Last Edited by Travis Bickle on 12/04/2012 08:04 PM One of these days... A *REAL* rain is gonna come and wash all this scum off the streets. |
Anonymous Coward User ID: 22048331 United States 12/06/2012 08:27 PM Report Abusive Post Report Copyright Violation | |