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Specialty Chemistry Forums => Citizen Chemist => Topic started by: Floyd92 on January 29, 2013, 06:03:03 PM

Title: How to alter the boiling point of a solution by adding other chemicals?
Post by: Floyd92 on January 29, 2013, 06:03:03 PM

Hi, this is my first post so hello to everyone!

I have an idea which I won't explain because it will take too long. Anyway I am trying to find a solution (relatively inexpensive and non corrosive) with a boiling point of 10 degrees centigrade. Obviously there are lots of possibilities but I'm looking for ideas.

Appologies if I sound a bit blunt but my chemistry is very rusty.

Thanks!

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: Arkcon on January 29, 2013, 06:58:36 PM

A quick check of the CRC suggests that 1,2 butadiene, or butadiyne or ethyl methyl ether as common compounds with a boiling point of 10 C.  The first is difficult to prepare, and the last isn't the safest ether to keep around in the pure state, and additives raise the boiling point.

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: Floyd92 on January 29, 2013, 08:29:22 PM

Thanks, with regards to ethyl methyl, would it be safe enough if keeps in a totally sealed system? With heat or refrigeration being used to change between liquid and gaseous states to increase or decrease pressure?

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: Arkcon on January 29, 2013, 09:00:40 PM

Methy ethyl ether i supposedly the worst ether for the formation of explosive peroxides.  In general terms, a sealed system should keep oxygen out, but in practice, in the long term, we just don't make assumptions like that.  All engineered refrigerator systems do develop leaks at some point.

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: curiouscat on January 29, 2013, 11:23:07 PM

How about Cyclobutane? 12°C? Close enough? Sounds safer.

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: curiouscat on January 29, 2013, 11:25:10 PM

Or neopentane? But that's flammable too. Well, at least not explosive.

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: Floyd92 on January 30, 2013, 06:34:36 AM

ok, so maybe i should explain the project (or rather concept) in it's basic form so you can all have a clearer idea of what would be suitable.

The idea is to use fluctuations in atmospheric temperature and/or water temperature to change a liquid solution to a gas (Increasing pressure which could in turn drive a turbine, or similar) and then the same gas back to a liquid solution, decreasing the pressure and creating a vacumn in the second boiler causing another turbine to spin and generate electricity.

(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fi1308.photobucket.com%2Falbums%2Fs601%2Fscottishexp%2Fconcept1_zps268d2e15.jpg&hash=f10e715ce997f27ecc3fe271c59771167d9e9a34)

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: curiouscat on January 30, 2013, 06:39:25 AM

Can turbine #2 be a turbine or does it have to be a pump?

Title: Re: How to alter the boiling point of a solution by adding other chemicals?
Post by: Floyd92 on January 30, 2013, 06:50:07 AM

can be a turbine. the high pressure in boiler 1 will move to the low pressure in boiler 2 when heated, and then when boiler 1 is cooled and boiler 2 is heated, the reverse will happen.