Hi Toby and All,
The iron/steel cuttings is a good idea if they are turned into
rust/iron oxide. SS/nickel though tends to make H2-CO so not what you want.
What temp you use determines what product you get. Lower temps,
400F give you heavy HCs, waxes, alcohols and higher ones, 475-550F give you
lighter HC's, gases like methane, propane, butane higher gasolines.
You'll need a very long tube stuffed with cat and held within 10F
of your target temp. The process is exothermic, no heating needed, so getting
rid of heat, narrow tubing using thermal oil or steam is important and you are
likely to need to recirculate it to get enough product change. I'd do a long
tube with a liquid collection sumps every 20' or so to remove product.
The cat will need cleaning by pumping in just H2 as production
decreases.
The archive on the Gas-to-fuels list is a good place to start or
the FT archive, especially if you read German as it has the WW2 FT process from
the Nazi's info.
Fischer's early experiments are interesting too as they were done at
atm pressure and produced the more valuable, cleaner, lighter HC's. Nazi's were
going for waxes, lubes, not fuels.
Jerry Dycus
--- On Wed, 9/1/10, Toby Seiler <[email protected]> wrote:
> From: Toby Seiler <[email protected]>
> Subject: Re: [Gasification] tube reactor for gas-to-liquids tests?
> To: "jim mason" <[email protected]>
> Date: Wednesday, September 1, 2010, 9:46 PM
> Jim,
>
> The cat is in the wrong place. Since you are supplying H
> and CO in bottles, the gases must be combined and heated
> then condensed within the catalyst and precipitated out.
> I'm not sure that having the cat in the heating is where it
> is needed as much as in the condenser.
>
> For a catalyst I would try plain iron lathe shavings
> after finding a local industry machining/cutting cast iron,
> perhaps cast steel. Or stainless, but I have no idea as to
> the chromium (yet).
>
> My suggestion would be to have an electric element such
> as a ceramic heater for heating your gases mixing
> them (why?...sorry can't disclose everything) and then
> expand them in a cooler packed with lathe millings. I
> would have a truck radiator and wind coils inside of the
> cooler vessel for water cooling. Large temp differance for
> going well below dew point, at least for the water.
>
> (2n+1) H2 + n CO → CnH(2n+2) + n H2O seems to be
> relevant. I would hope to have more than methane, even
> shooting for butane.
>
> _C4H10 + _O2 -> _ CO2 + _H2O and balanced 2 C4H10 +
> 13 O2 -> 8 CO2 + 10 H2O
>
> Maybe a dream, but if you have long enough residency time
> and enough cooling !
>
> Jeff, do you suggest electrodes that have an arc, as in
> plasma, or bringing water into the mix at the beginning?
> Would that be (2n+1) H2 + n CO + _ H2O or what? Seems
> like too much O.
>
> Regards,
>
> Toby Seiler
> Seiler Technical
>
>
>
>
>
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