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Topic: High pressure problem in the laboratory?  (Read 5217 times)

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Offline benjamin5476

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High pressure problem in the laboratory?
« on: September 25, 2012, 08:23:25 AM »
I want to do an organic reaction of high pressure,But I can not find the requirements of equipment,I want to achieve pressure is 60kgf/cm2,What kind of equipment is more appropriate??

Offline discodermolide

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Re: High pressure problem in the laboratory?
« Reply #1 on: September 25, 2012, 08:40:07 AM »
What scale will the reaction be?
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Offline fledarmus

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Re: High pressure problem in the laboratory?
« Reply #2 on: September 25, 2012, 08:46:26 AM »
If you got to the Sigma-Aldrich website and search for "pressure reactor", you will find several varieties rated for different pressures. I have found the following type to be most convenient for small scale lab work, but they use over-heated solvents for pressure and have no provision for adding additional gas for pressure.

http://www.sigmaaldrich.com/catalog/product/aldrich/z181099?lang=en&region=US&cm_sp=Customer_Favorites-_-Detail_Page-_-Image-Z181099

I have also used something similar to this when I needed to use high pressure gas in the reaction. In my case it was ammonia.

http://www.berghof.com/Products/en/Products/Laboratory+Instruments/High+Pressure+Reactors-p-3011.html


Offline benjamin5476

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Re: High pressure problem in the laboratory?
« Reply #3 on: September 25, 2012, 01:33:19 PM »
What scale will the reaction be?
The reaction scale is 2 L,Do you have any suggestions?

Offline discodermolide

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Offline fledarmus

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Re: High pressure problem in the laboratory?
« Reply #5 on: September 25, 2012, 03:43:35 PM »
Wow, 2L pressure reactor - that almost takes it out of laboratory scale. You might want to check with whoever your facilities manager is to be sure you can run that large a reaction under that much pressure inside your lab. Many labs and especially lab hoods aren't rated for containing pressure if there is a rupture.

It also takes you well beyond the glass pressure vessels. You will probably be searching for either a stainless steel pressure reactor or a glass lined pressure reactor. A quick google search turns up lots of suppliers for both.

Unfortunately, my last experience with a pressure reactor that size was nearly 30 years ago, and the reactor was an obsolete piece of equipment then. I don't think my input will be very helpful.

Offline discodermolide

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Offline orgopete

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Re: High pressure problem in the laboratory?
« Reply #7 on: September 26, 2012, 07:48:50 AM »
Wow, 2L pressure reactor - that almost takes it out of laboratory scale. You might want to check with whoever your facilities manager is to be sure you can run that large a reaction under that much pressure inside your lab. Many labs and especially lab hoods aren't rated for containing pressure if there is a rupture.

I agree with this comment. Although I have not done many high pressure reactions and of them were on a large scale, safety really needs to be addressed. I have seen the results of high pressure ruptures. I always have a lot of anxiety with these reactions, especially at the start and end when you have to expose yourself to what may be a high pressure vessel. Why do you think the vessel may also be referred to as a bomb? If so, then a 2L vessel might be referred to as a big bomb.
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Offline curiouscat

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Re: High pressure problem in the laboratory?
« Reply #8 on: September 29, 2012, 10:56:15 AM »
I've used Parr reactors; very convenient.

Here's a 2 L, 200 bar model:

http://www.parrinst.com/products/stirred-reactors/series-4520-1-2l-bench-top-reactors/

Offline curiouscat

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Re: High pressure problem in the laboratory?
« Reply #9 on: September 29, 2012, 10:58:21 AM »
Look in Google for the equipment. Pressure reactors: for example: http://syrris.com/batch-products/atlas-pressure-reactors?_kk=pressure%2520reactors&_kt=8c2e207e-0ee7-4809-a2c1-609abdff90e0&gclid=CMHygICl0bICFcRV3godalgAgA

Why are they called "Atlas Sodium Pressure" and "Atlas Potassium Pressure". They use the molten  metals as a heating medium?

I was intrigued by the reference to Alkali Metals in their names.  ???

Offline discodermolide

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Re: High pressure problem in the laboratory?
« Reply #10 on: September 29, 2012, 11:16:52 AM »
No idea, certainly not what you suggest.
Why do you have Escort as a name for a car or Astra or any other name. Why is your name curiouscat?
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Offline curiouscat

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Re: High pressure problem in the laboratory?
« Reply #11 on: September 29, 2012, 11:58:36 AM »
Why do you have Escort as a name for a car or Astra or any other name. Why is your name curiouscat?

That itself is one satisfactory explanation. I read more into it than there was.

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