Is it just in my head? Or can these cheap

used Vacuum pumps, on-net, be safely used to

suck solvent?

I would like to evaporate naphtha or alcohol.

If one was using super useful Methanol, will

a Vacuum suck every last poisonous drop out?

A good way to recycle solvents?

[This message has been edited by sitbcknchill (edited 12-30-2003).]

ive always thought vacuum was spelt vacumn,,till i just looked it up then,,

who gives a shit right...

can it suck solvent,,

nope..

can it create the vacuum required to decrease the internal pressure allowing the solvent to be evaporated at a lower temperature???

yeah it could,, but the gaseous solvent would still eat all the internal plastic parts of the pump,,just slower..

they sell little hand pumps from lab supply businesses,,they arent bad...

I though some labor-atory techniques used a vacuum to remove solvents. Water or any of

your typical solvents will fill up the space

devoid of air. No?

I mean no way will one have a puddle of liqid

water at say 1-psi. Nor a puddle of Acetone

or Naphtha. Any non-volatile compound (good

or bad) will be left behind.

Sure, heat evaporates yer solvents, but if

one just wants to remove a solvent?

hmm,,

is there a piece of equipment that collects solvent by a vacuum enticing the liquid into a container,,

i havent heard of one...

the only knowledge i have in this area is,

if a solvent is heated in a vacuum,,

said solvent will boil at a lower temperature.

Over on Totse's front page; "Miscellanious

Drug Info - Alkaloid Extraction", he uses a

Vacuum pump to extract the last of the

Methanol. I guess that means he uses heat to

extract most of it.

It's a mystery to me. As the pressure lowers

boiling points all go lower than room temp.

No?

If it was that easy, everyone would do it. ??

hold on laughing gas,

creating a vacuum inside a sealed pressure vessel over heat,,isnt heating toluene in the kitchen ..

I think you could use a used pump, and i'm sure it would suck out most of the Methanol, but I don't think it would remove all of it. I think evaporation would remove the rest.

quote:Originally posted by kirby:

hold on laughing gas,

creating a vacuum inside a sealed pressure vessel over heat,,isnt heating toluene in the kitchen ..

My impression was he used heat at normal air

pressure, then went to vacuum. I still wish

someone with schooled lab techniques, would

answer though.

As air pressure drops, so does boiling point.

So, a low enough pressure, means you don't

need added heat. I figure no way can a

volatile solvent stay in a substance, it's

gonna evaporate from any ways. When the darn

air is mostly gone.

For instance: There is a portable hypo-baric

(low-pressure) chamber used to dry flooded,

valuable papers & books. It supposedly dries

them so quickly, that mold has no chance to

get started.

If one is not refluxing solvent & just wants it out? It is impossible to have any liqid in

a vacuum. No?

solvents,

when left at room temperature,

will either evaporate through a dry enviroment,

or if in a moist enviroment,

will evaporate slower whilst absorbing moisture from the enviroment...

hyperbaric chambers

hyperbaric medicine

these are two areas where i have had extensive training and education...

is it possible to have a liquid in a vacuum,

that is not refluxing??

yes it is..

Liquids in a vacuum, won't last will they?

I mean their boiling points are all reached

way before anywhere near total vacuum. No?

Is not that the theory behind the "bends"?

When the pressure of water is, too quickly,

removed from the body of a diver, the

Nitrogen that has been forced into their

blood, boils. No?

I'd love to boil solvents in the absense of

flame & oxygen! It just seems way more sexy.

Flame & solvents, not sexy, unless one is

doing Better Living Through Explosives!

hmm,,

0 to 250 feet you have 2 gases going in,,oxygen and nitrogen,,plus trace elements of quite a few others..

the o2 is easily on and off gassed through the cells,,o2 goes in,,co2 come out,the bloody picks up the co2 and kicks it out in the lung,,picked up and breathed out..

nitrogen,,

goes through the cell membranes/on-gassing,,far faster than it can pass back/offgassing,eg; a muscle hit or a skin hit,,the nitro cant get out of the muscle/skin quick enough,,this nitro begins to interfere with the nerves and arse over you go,,

its the same for any part of the body,,it can trap nitro and root you dry,,the worse being a CNS hit or a brain hit,,

as far as boiling in the blood,,

no,

the nitro's ability to pass into the blood and be removed back to the lungs/offgassed and removed by breathing is severely restricted by its low ability to transfer through cell membranes,,as such it collects in the joints,,and you have a bone hit..

skin hits are tolerable,

from there on there savagely painfull,,very frightening,,and often fatal..

Dude, I'm vague, I don't know. I just know

that googling for vacuums + solvents, makes

me feel that if I'm lucky, I'll graduate Gr.

3. No wonder (or wonder again & again) 'geers

are weird!

The Electron Shell Game, is GONE, just gone.

So far, that if you got a grasp; Certain, on

any little piece. Consider yerself, lucky.

Maybe you, can parse them online deals, but I

go duh!

moon,you have lost me,,

whats GR,3.

what is a GEER?

if it is an engineer,

yeah some of us are weird,,

some arent...

what is the electron shell game??

what online deals??

originally you asked would a vacuum remove every drop of methanol,,,

yes it would,,

but so would leaving it in a warm dark room..

but,

if you havent dried your methanol,

then the 5% water content of the methanol,, in the wrong humidity,,

may take a month to dry,,

if it ever does..

Grade 3.

Engineer.

Like I say, those weird machines for extract-

ing solvents, that one finds on google. I

guess one could get the manuals...but why?

I want a smoke or a bump. Have you looked at

those industrial processs machines? They look

too expensive, unless one is an Angel. But,

Nature has her Laws, all I want to know is;

can one spend a $100.00 for a Vacuum pump to

extract; say Methanol from "whatever"?

I mean, gosh, there are a zillion people on

these BBS at one time or another. Some must

have been through serious Labs, using Vac.

Else, how could people build & sell these

weird solvent extracting machines?

Electron Shell Game. All Life. No fooling

with electrons, means only kinetic action.

Like, your typical Elemental Gasses.

Oxygen or Chlorine:"Hi, like these electrons?

Wanna touch 'em? Sure ya do, go ahead. Nice

huh? That wasn't so bad was it? Go ahead you

know you want to".

Go ahead, stop fooling with those Electrons,

you know you should!

ps. What did the organism say? Whoa, look at

the Gasses on those Carbons! (At least that's

what I think my Reptile brain says they say)

i dont know what your on,,

but i want some of it,

right now

i havent heard of a grade 3 engineer,,

ive heard of,

structural

mechanical,

electrical,

aeronautical,

subsea,

few others,

but not grade 3

yeah you can buy a vacuum pump for a 100 dollars,,

its what your going to connect it to that costs,,

say it was a condensor,,

another couple of 100

vaccuum pumps are indeed used for filtration purposes and for creating a vaccuum within a sealed system that some lab techniques require to lower the boiling point of some things. SWIM hears they last ok as long as one keeps the oil changed in them regularly. SWIM also hears that refrigerator pumps/compressors can be used when modified properly. for filtration purposes only SWIM recommends a simple hand operated vaccuum pump available at any auto parts store in the form of a brake bleeding kit. run you about 20 bucks or so.

check this place out. SWIM hears these are amongst the best pumps on the market.

http://www.varianinc.com/cgi-bin/nav?varinc/docs/products/vacuum/index&cid=$CID

quote:Originally posted by Wicked_Rain:

check this place out. SWIM hears these are amongst the best pumps on the market.

http://www.varianinc.com/cgi-bin/nav?varinc/docs/products/vacuum/index&cid=$CID

Yup. If I ever spend a few years at MIT or

CalTech, & have an urge to pump Helium, make

semi-conductors or perfect fusion...

Maybe, I'll just stick to heat & air.

quote:Originally posted by moonmeister:

Maybe, I'll just stick to heat & air.



that dont sound like much fun

quote:Originally posted by Wicked_Rain:

that dont sound like much fun

Well if i ever get serious cash (which I'm

seriously doubting) I'll look into buying a

small generic drug company. Then I'll see

just what's what.

I don't know much about primo lab chems, but

who can't imagine just legally ordering just

about ANY? Company works M-F? Wonderful week

ends!

Some of those automotive Vacuum pumps look

interesting. Although the only spec. that's

relevant said 25 inches of Vacuum. As far as

Googy shows that would lower boiling points

some. Not so far that liquid is impossible,

though.

From the charts, more serious V. takes the

boiling point of water down below 0c !

I'm kinda partial to Iso now but have my l'il

heart set on old 'anol. So scary, so good.

http://www.surpluscenter.com/item.asp?UID=2003123022112640&catname=&qty=1&item=2-1075

Magnetic Drive

Chemical

Pump

Price $94.99

5.5 GPM 115 VAC LITTLE GIANT PUMP

10 In Stock



Polypropylene pump housing handles low concentrate acids. Max. fluid temp. 150° F.

Is not that a circulating, rather than a V.

pump? Though surplus V. pumps do seem to go

for similar prices. Then of course, does one

want their solvent going just anywhere?

What does one need? An airtight container, a

vacuum pump, a whatzit to seperate solvent

from air.



Well more gin & back to Googy. Maybe even

a 0430 hrs. trip for the tomatoes evil Cuz.

ah um, I think someone got VAC ( volts Alternating Current) mixed up with VACuum.

Boiling temps depend on the outside pressure.

A lower pressure lets a liquid boil at a lower temp.

And vice versa, your car cooling system is under pressure, so that the coolant won't boil when the engine gets to 100deg C.

water boils at 100 deg C At Sea Level.

A way to find out what altitude you are at is to boil water and check its temp, ( this is also dependant on the air pressure, which can put it out of sync a bit.)

Makes making a decent cup of tea a problem in high altitudes.

I think the reason to use vacuum is so that the solvent boils at a lower temp.

It still needs tempature though. The, say, solvent boils, rises as a vapour, travels thru the system, then condences (sp?) when it meets the cold end of the system, in the collecting flask.

Also, if the chemical in the solvent breaks down/degrades at a certain temp then by changing the pressure, the solvent will still boil.

The vac pump pictured is similar to a pump Swims got, its off a old money machine, the air pumped lifted a glass window up & down.

Would provide a vacuum too.

The vacuum pump actually doesn't suck the solvent out, it lowers the boiling point.

Whats needed somewhere 1/2 way thru this thread, is a jar with two hoses in the lid.

The hose from the boiling solvent setup goes into the jar, down almost to the bottom.

The other hose fitting starts at the lid level and goes thru to the vacuum pump.

Remember everythings air tight.

The above collection jars sorta like a bong,(we can all see that in our minds now.)

This stops the solvent getting into the vacuum pump, ( old freezer compressor pump)

There should probably be Two jar setups in a row, cooled in ice water too to condense the vapor out.

Also you maybe wanting to get the solvent/liquid out and using that, not the stuff in the boiling flask.

Most chemistry boils down to reaction and extraction.

Vacuum is normally about 20 ( mm/Hg or something) A freezer pump gets around about this, depends on seals, power etc and oil lube, Auto trans oil seems to give the best result, (from the reports here).

Swim mucked around with 3 or 4 before he gotta good one.

Two vacuum pumps in line can be used to lower the strain on each pump.

Swim thought it was spelt vaccum for a long time, not the first person, not the last.

The boiling flask can be kept at the same temp and the vacuum pressure manipulated to bring out different 'cuts' of the substance or solvent.

Swim read somewhere that water escaping from a vessel in spaces vacuum, boils and freezes at the same time.

Hope all this was helpfull, Swim.

Those small hand pumps Kirby mentioned, Swim thinks they are like the vehicle brakefluid pumps you can get at auto stores.

About US$65 here.

And those penis extenders advertised in Penthouse. ha ha.

Brake fluid is hydroscopic, it sucks moisture out of the air.

When the car is doing a lot of braking ,like on a long bendy downhill stretch the water in the brake fluid can boil.

The brake pedal goes 'hard' and the car will pull to one side, while needing a lot of pressure to stop.

When this happened to Swim, he got underneath car and undone the bleeding nipple, a jet of grey steam shot out for about 30 secs before the fluid did.

If bleeding brakes, don't use the brake pedal to push fluid thru, as without back pressure the pedal will travel futher and pick up bits of rust in the master cylinder, fucking the master cyl seals. Use a vacuum pump or get the autoshop to do it that way, the vacuum pulls the fluid past the seals allowing a complete flush of the system, always wondered if the vacuum off the carby could do that.

Brake fluid should be replaced every year.

The shops use different color fluid to tell when its completley thru.

Its so easy for them its not worth doing yourself, they do it at the same time they change the engine oil, and can do it for the same price as the oil,filter,fluid you buy anyway, check the sales specials.

Anyway, hope this saves someone a lot of grief and explains a few things too.

best vacuum pump ive seen was was a gorgeous little thing from thailand called ""under the table tasha""

Well, not having any weirder solvents than

IPA & H2O, at present. Browsing the the 100

zillion ofbytes used & say www.vacuubrand.net (http://www.vacuubrand.net)

is my present limit. I like their PC2001, I'm

very fond of pumps that say oil-free.

Vacuubrands used stuff mostly seems 4 figures

so I think I'll continue to browse & figure

out just what is required. Who wants 75lbs.

of the wrong expensive stuff sitting about?

Can one use those brake bleeding hand pumps,

or is it better to just wait & pick out a

real pump? Like a real degree-geek.

if you want an oil free vacuum pump then leave the italian and greek women alone,,and the arab female can be an oily bitch too

Knew an English girl once.. Sadie.

A Irish girl..she wouldn't tellus.

The German girl.. Electrolux.



Hmm Bangkok, For 50cents you get a beer, for two dollars she'l give you a blowjob while you drink it..

all on patpong road 1

ever dealt with hydraulics?

you can create vacuum easily by the use of a piston and a screw, much more than through the use of an electric pump

quote:Originally posted by Symbiote:

ever dealt with hydraulics?

you can create vacuum easily by the use of a piston and a screw, much more than through the use of an electric pump

elaborate on this please. will it work in a lab environment? will it work in the context that is spoken of here? if so then why arent pumps made that way for lab use?

quote:Originally posted by Wicked_Rain:

elaborate on this please. will it work in a lab environment? will it work in the context that is spoken of here? if so then why arent pumps made that way for lab use?

size is a limiting factor. greatly reduced pressure would require a large piston. basically it involves increasing the volume of a closed container

ever used a hypo?

the principle is pretty basic, i am not going to elaborate