Re: scCO2 storage

mark_tarka_at_yahoo.com
Date: 12/29/04 

Date: 29 Dec 2004 09:45:19 -0800

clutchbabe wrote:

"Crutchbabe"?

> I work for a small company who has been asked to provide a quote for

Uhm, yeh.

> some pressure vessels (enough to store 70 cubic meters of
supercritical
> CO2 at 20MPa).

You don't _store_ SCCO2, you use normal tanks
of CO2 that feed a pump associated with your
equipment; that pump creates the SCF as you
need it.

> I am not a chemist, and have been having some trouble
> finding simple information to guide me in this task, I am hoping
> someone may be willing to provide some answers or direct me to a
place
> to find them. (Uncle Al, I am specifically hoping you answer)

That's what UA meant to say :-)

> First of all, how to you find the temperature at 20MPa prior to
> providing the heat to make scCO2? Besides a pressure relief valve,
are
> there any other special pieces needed for the vessel (i.e. does it
need
> to be insulated etc). Does scCO2 or regular CO2 have material
> restrictions (i.e. SST vessels or will carbon steel work). Basically,
I
> have designed 31 pressure vessels (36" i.d. x 10ft long, 4" thick) to
> withstand the pressure and I am wondering if there is more to it then
> that. The end-user will be supplying the scCO2, the bank of vessels
> will be manifolded together so that all fill or empty at the same
time.

Of course, UA and I could be wrong and your end-
user will die while using your equipment. Do you
have adaquate liability insurance?

> I have proposed a low pressure tank with a pump to them but it was
not
> an acceptable solution. They must have it this way...

"They" are, of course, morons (assuming that
this is a legitimate post; unlikely, given
the state of the art in the industry at this
time :-)

Mark (Then there was the time I had to
use SCCO2 to extract the essence
of plaid fabric in order to discern
the manufacturer; it was a criminal
case -- the girl shot the man in the
back while he was sleeping. Of the
28 bullets striking the victim, 3
passed through his boxer shorts,
plaid, and the threads carried into
the body were part of the D.A.'s
evidence against her -- she had
worn the shorts earlier and the
fabric contained stains from her
        anus and vagina :-)