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zeolite alternatives

zeolite alternatives - Chemistry Forum

zeolite alternatives - Chemistry Forum. Discuss chemical reactions, chemistry.


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  #1  
Old 10-20-2003, 01:59 PM
Anneke
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Default zeolite alternatives



I am wondering if there are any (environmental friendly) alternatives
for zeolite for use in cooling systems, e.g. other minerals that have
similar internal surface or cooling capacity...
I am interested in the names of alternatives, the way they work
(similar to zeolite??), the possibility to re-use them (as you can
recycle zeolite) and their capacity.
Suggestions and ideas are very welcome!!

Anneke
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  #2  
Old 10-21-2003, 07:55 AM
jacques jedwab
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Default zeolite alternatives

In article <[Only registered users see links. ] >,
[Only registered users see links. ] (Anneke) wrote:


What's wrong with zeolithes?

Some candidates for your possible list:

active carbon, phyllosilicates (bentonite, glauconite, etc.), asbestos for
thousands of uses (with its drawbacks), perlite, phosphates, sulfates,
etc., etc., but generally for narrow range uses.

Look at a book on industrial minerals (e.g. Harben et Bates: "Geology of
the non-metallics", Metal Bull. Inc., 1984)

Beware: the concept of an "environmental friendly" material vanishes away
once the "friend" has been put at work for something and has been
transported, modified, saturated, agglomerated, heated, dumped, dispersed
at sea, stacked, stored, packed, etc.

J.J.
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  #3  
Old 10-22-2003, 01:26 AM
Gregg
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Default zeolite alternatives


"Anneke" <[Only registered users see links. ]> wrote in message
news:363f8cb6.0310200559.20936273@posting.google.c om...
Why are zeolites environmentally unfriendly?
They are typically used in refrigeration systems to remove water from the
refrigerant and activated alumina maybe added to remove acids that form in
the system.
Desiccant cores (the name for the zeolite units) are typically phosphate
bonded cores and fired to remove any chemically bonded water (~900 F). The
freshly fired cores are hermetically sealed (in a can) while they are still
hot.
The zeolite itself is just an alkali or alkali-earth alumino-silicate
material - same basic chemistry as clay - in fact some clays can
intercalated or processed to form zeolites.
Zeolites are inexpensive and they can be easily reactivated by reheating -
the cores are not often reclaimed because removing them from the plumbing
and reheating it is just too expensive. Some companies claim they can
regenerate cores with vacuum - but I have not seen any data that indicates
this method restores sufficient capacity to make them useful.
Zeolites are basically harmless processed dirt (maybe the phosphate bond
could be a very small possible environmental problem - I doubt it - but the
zeolite beads are sometimes held in place by a screen w/o using phosphate
bond) Loose sieve is a problem because the screen maybe more expensive than
the boned core unit and if loose zeolite pieces break away they can ruin a
compressor - now you have an entire refrigeration unit to dispose of.
If you want to do something environmentally friendly - you should
concentrate on materials other than desiccant cores used in refrigeration
units.
Gregg


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  #4  
Old 10-22-2003, 09:40 AM
Anneke
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Default zeolite alternatives

Would it be possible to cool down for example a small container of
liquid without the zeolite (or alternative) in it?
I read that one of the purposes is for example cooling of beer
barrels/casks. In Germany there seems to be some patent about this but
not on zeolite but some other similar working mineral.....
Environmetal friendly referred to alternatives...Zeolite is also used
in for example drying of food ingredients.

Anneke


"Gregg" <[Only registered users see links. ]> wrote in message news:<l1llb.123881$[Only registered users see links. ].adelphia .net>...
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  #5  
Old 10-23-2003, 09:25 PM
Gregg
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Default zeolite alternatives

Zeolites are not needed to build a working refrigerator - they just help the
refrigerant and equipment last longer by taking contaminants out of the
refrigeration fluid.
If you take activated zeolite (a lot of it) and throw into water it has a
fairly violent reaction - the water will become quite hot and may even boil.
Zeolites can be designed to specifically adsorb a variety of substances -
not just water.
I'm not sure why replacing zeolites is an issue unless low cost alternatives
are being sought. -
There is a new product just out in the US that uses zeolites to stop
bleeding - just sprinkle it on the wound - no more bleeding.
(although if your not careful it can cause burns) - The inventor originally
used it on nicks from shaving
It has already been a great success for treating troops in Iraq (where it
has saved several lives)and it has been approved by the FDA for over the
counter sales.
- So simple - I wonder why nobody thought of it years and years ago?
Gregg
"Anneke" <[Only registered users see links. ]> wrote in message
news:363f8cb6.0310220140.143b65e3@posting.google.c om...
news:<l1llb.123881$[Only registered users see links. ].adelphia .net>...
the
in
The
still
reheating -
plumbing
indicates
the
phosphate
than
a
refrigeration


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