Non-Chemical Boiling a Platinum Solution Down

[rusty]

As ya'll can see the boiling flask is perfect for the task.

http://youtu.be/7WPmqM2W3sw

 

[g_axelsson]

Personally I would use an evaporating dish, the boiling flask is making the vapors condense again and go back into the flask.

Göran

 

[glondor]

would a small fan blowing across the top create a venturi effect and draw the vapor off faster?

 

[rusty]

would a small fan blowing across the top create a venturi effect and draw the vapor off faster?

I suppose a draft of air directed in the right direction would create a venturi effect drawing more vapor from the flask.

What I really need is a stopper for that flak to pull a vacuum, then I could even lower the temperature of the liquid.

 

[rusty]

Personally I would use an evaporating dish, the boiling flask is making the vapors condense again and go back into the flask.

Göran

The glass of the flask is hot there are no vapors being refluxed.

With the large surface area there's a lot of liquid being evaporated in a very short amount of time. The boiling flask beats anything I've used in the past.

 

[niteliteone]

Personally I would use an evaporating dish, the boiling flask is making the vapors condense again and go back into the flask.

Göran

The glass of the flask is hot there are no vapors being refluxed.

With the large surface area there's a lot of liquid being evaporated in a very short amount of time. The boiling flask beats anything I've used in the past.

With the boiling flask you have the global sides and top to catch microscopic splash of the bursting bubbles that returns values back to the solution. Allowing a faster evaporation time.
With the evaporating dish, you have to keep your temperature lower to insure no bubbles form that will splash values from your solution. You are able to blow air over the surface somewhat speeding the evaporating process.
Each method has its benefits and drawbacks. I use both, depending on what I am doing and how much time I have to monitor the process.

 

[rusty]

Personally I would use an evaporating dish, the boiling flask is making the vapors condense again and go back into the flask.

Göran

The glass of the flask is hot there are no vapors being refluxed.

With the large surface area there's a lot of liquid being evaporated in a very short amount of time. The boiling flask beats anything I've used in the past.

With the boiling flask you have the global sides and top to catch microscopic splash of the bursting bubbles that returns values back to the solution. Allowing a faster evaporation time.
With the evaporating dish, you have to keep your temperature lower to insure no bubbles form that will splash values from your solution. You are able to blow air over the surface somewhat speeding the evaporating process.
Each method has its benefits and drawbacks. I use both, depending on what I am doing and how much time I have to monitor the process.

For reducing a pregnant platinum liquor such as the setup I'm using would you recommend using boiling chips.

 

[niteliteone]

Personally I would use an evaporating dish, the boiling flask is making the vapors condense again and go back into the flask.

Göran

The glass of the flask is hot there are no vapors being refluxed.

With the large surface area there's a lot of liquid being evaporated in a very short amount of time. The boiling flask beats anything I've used in the past.

With the boiling flask you have the global sides and top to catch microscopic splash of the bursting bubbles that returns values back to the solution. Allowing a faster evaporation time.
With the evaporating dish, you have to keep your temperature lower to insure no bubbles form that will splash values from your solution. You are able to blow air over the surface somewhat speeding the evaporating process.
Each method has its benefits and drawbacks. I use both, depending on what I am doing and how much time I have to monitor the process.

For reducing a pregnant platinum liquor such as the setup I'm using would you recommend using boiling chips.

They should reduce the size of the bubbles reducing some of the splash, but I really don't see a benefit with this evaporating/condensing process. I have never used them when concentrating solutions, but I use boiling flasks like you are, so the splash is contained and self recovers.

 

[Harold_V]

As ya'll can see the boiling flask is perfect for the task.

My opinion?

The only thing I can see is the word "boil" connected to evaporation, which is sending the wrong message to readers. We've worked hard to get them to understand that under normal circumstances, one does not boil to evaporate, as it tends to result in losses.

The design of a boiling flask is intended to capture vapors or spatters that one hopes to retain. It is not intended for use as an evaporator, at least not one for venting to atmosphere. An evaporating dish is aptly named, and does not resemble a flask of any description. It provides a large surface, which readily discharges a large volume of vapor, all the while making the best use of the provided heat. It does not recycle vapors, which can't be said for a boiling flask.

Harold