Moj trenutni vir vakuuma in malo razmišljanja o tej temi

[Osmosis Vanderwaal]

1. 
   Ko gre za vakuumske vire za labf
   
   
   
   Ko gre za vakuumske vire za domači laboratorij, je žal težko najti poceni možnosti. Če želite dejansko dobro laboratorijsko vakuumsko črpalko, pričakujte, da boste odšteli 500 dolarjev za rabljen kos, ki je najmanj dober. Večina nas, domačih navdušencev, nima toliko denarja. Zato se zadovoljimo s ponovno uporabljenimi;
   1. Vakuumske črpalke z vrtljivimi lopaticami, ki se najpogosteje uporabljajo za sušenje vode iz klimatskih napeljav in odkrivanje puščanja. Glavna težava te vrste črpalk je, da ves zrak in plin, ki ga izsesate iz posode, potuje skozi olje črpalke ter hitro uniči tesnila in pokvari olje. Nekatere kemikalije so razgradile olje v eni vožnji, ki je trajala manj kot 4 ure. Ubil sem že nekaj poceni črpalk.
   2. Obstajajo membranske črpalke, ki so po velikosti in porabi energije podobne črpalkam z vrtljivimi lopaticami. Ne uporabljajo olja, zato nimajo te težave, vendar ne ustvarjajo zelo močnega podtlaka. Ne dovolj, da bi bili uporabni.
   3. Kitajska podjetja, kot je Vevor, izdelujejo majhne membranske črpalke za kemijo. V notranjosti so v bistvu akvarijske črpalke in imajo zelo majhno sposobnost čiščenja volumna, vendar lahko komaj ustvarijo uporaben vakuum pri statični obremenitvi, njihova cena pa se začne pri približno 175 dolarjih.
   Tukaj je tisto, kar trenutno uporabljam, dvostopenjska membranska črpalka, priključena zaporedno. Na Amazonu je bilo približno 30 dolarjev, vendar jih ima aliexpress za 20 dolarjev. To je potekalo iz 24 voltnega napajalnika, ki sem ga imel naokoli, toda $ 15 na Amazonu vam bo prinesel res premočnega, $ 10 na aliexpressu tako, $ 30-40. Postavil sem ga na pripomoček ( Imam nekaj) in potegnil -28 "hg. Voda vre pri 100 ° F namesto 212 (37,8C namesto 100) dovolj, da deluje za večino običajnih destilacij topil, vakuumsko filtriranje in desikacijo..just thought I would show a cheap alternative for a piece that goes with a basic kit
   
   

 

[Osmosis Vanderwaal]

Pozabil sem na venturijeve vire vakuuma. Nekateri stanejo 300 dolarjev in več, poleg tega pa morate imeti tekočo vodo. Izdelujejo tudi poceni, vendar nisem prepričan, ali so kos tej nalogi ali ne. Tudi ta črpalka je na eni strani potegnila -23 "hg", tako da bi jo lahko uporabili kot dva vira vakuuma, prav tako je zaradi delovanja druge črpalke na spletu dosegla 1/10 prostornine ene membranske črpalke. Je zelo tiha.

 

[jessejames122669]

3d natisnil sem vakuumsko črpalko asperator in jo imam v liniji z električno vodno črpalko, ki reciklira vodo v vedru. Še nisem imel priložnosti, da bi jo uporabil. Njegova glasna. moj mali vakuumski oljni akumator je precej ocvrt. dušikova kislina jih je močno poškodovala.

 

[Osmosis Vanderwaal]

Hkrati je tudi Hcl. Pravzaprav karkoli. Imam enomembransko črpalko, ki je v bistvu polovica tega in je preglasna, da bi delovala ponoči. Tudi ta je glasna, če je priključena samo na eno stran, ko pa priključiš drugo daiphram, postane za 20 dB tišja

 

[Dr. MMX]

dobil sem vevorjev najcenejši,,, smešno, da je trajalo približno pol leta z uporabo nekajkrat na teden. Običajno za filtratgion mmc freebase ali vakuumsko destilacijo. Verjetno imam srečo

 

[Osmosis Vanderwaal]

Nekaj časa sem jih obdržal pri življenju, ,morda tudi 6 mesecev, enega je ubila 4-urna destilacija in vakuumska destilacija *nekaj, kar je bilo zelo kislo, če bi imel res dobro past ali 3, bi zdržal 5-krat dlje

 

[Loki12]

Ugotovil sem, da je za destilacijo spojin z visokim bolingom in uporabo črpalke s korozivnimi snovmi ali topili, ki vplivajo na zdravje črpalke, boljša, čistejša in na splošno stroškovno učinkovitejša zamisel kupiti najcenejšo vakuumsko oljno črpalko AC in jo, ko umre (se preneha vrteti), preprosto zavreči in kupiti novo. Ni potrebe po domišljenih črpalkah s kemično odpornimi deli, saj stanejo preveč, še vedno jih je treba vzdrževati, dele pa je včasih tudi težko dobiti, če niste registrirana fizična oseba.

 

[Osmosis Vanderwaal]

Nekaj sem jih že ubil. Za vevorjevo črpalko z močjo 1/4 KM in pretokom 3,5 cm3, ki stane 60 dolarjev, ni na voljo nobenih delov. Pri teh majhnih vakuumskih črpalkah za enosmerni tok mi je všeč, da priključiš drugo stran in to je kompresor. Sinoči sem z njo razstrelil otroški napihljiv cnair. Trajalo je celo večnost (15 minut), vendar ti ne premaknejo veliko prostornine. Mislim, da bi lahko napihnil svojo pnevmatiko, če bi se potrudil.

 

[gnbarsh3463_11]

Kaj pravite na obdelavo teh delov iz teflona? Z mojo oljno črpalko se dogaja, da drsni plastični ventil v notranjosti absorbira topila in se razširi, nato pa se zatakne. Ta del je enostavno obdelati iz teflona z domačim orodjem (gre dobesedno za dve ploščici z vzmetmi v notranjosti), vendar nisem prepričan, kako dobro bo deloval teflon, saj je veliko mehkejši od katerega koli materiala, iz katerega je izdelan ventil.
In kovinski deli - morda jih je mogoče prevleči z nikljem zaradi odpornosti proti koroziji?

 

[Osmosis Vanderwaal]

Obe moji rotacijski črpalki z žilami imata teflonske lopatice, težava je v tem, da se olje razgradi in izgubiš podtlak, poleg tega pa so v ohišju ventila majhne luknjice, ki se običajno zamašijo

 

[Labchef]

Želim si, da bi obstajal videoposnetek, ki prikazuje vakuumsko destilacijo z eno od tistih vakuumskih črpalk z vrtljivimi lopaticami, ki se uporabljajo za odplinjevanje epoksida.

 

[Osmosis Vanderwaal]

I e jih je nekaj zgorelo. Resnično preprosto je, kako jih uporabljati. Priključite jih in vklopite, na eni strani je vakuumska linija, na drugi strani je ventil, na vrhu pa je merilnik, malo odprete ventil in tako nadzorujete vakuum. Največja težava pri njih je, da gre ves zrak, ki ga vakuumiraš, skozi olje, preden se izloči. To je v redu za vakuumsko komoro, vendar je življenjska doba olja lahko le 1 minuta, vendar je moje povprečje 4 ure.

 

[SunDay]

Hello guys,
Maybe someone have experience with vacuum pumps? I used one from hobby shop, but after couple of shifts is become broken, i think that simple vacuum pump "doesnt like" dcm or acetone fumes. maybe there is alternative ?

 

[Osmosis Vanderwaal]

Generally nothing likesmthose things. Donyou knownwhat kindnof pumpmit is or can you link ampicturemfrom the net? There are several typesmof vacuum pump.mthe vane pump, often used in repairing a/c equipment, needs vacuum oil andnall of the air it vacuums passes through thay oil, andnthere for the oil is ruined regularly and hasnto be changed every few hours. DIAPHRAM VACUUM PUMPS USE A RUBBER/SILICONE TYPE DIAPHRAM ans therefor are oiless pumps, but depending on the composition of the diaphram could dissentigraye in contact with sctrong chemicals. Then there are claw vacuum pumps, which work on the same principals as a roots style supercharger, and a few vareantiions of each of these. Then there is the aspirator vacuum pump, clearly the besy in situations one can use it in, uses water from a faucet passing ove a venturi andndrawing vacuum. Its the same tehnolgy as a perfume bottle with a bulb you squeeze thay makes a mist or now a carborater works. A carb passes air by thenventuri to draw out gasoline, and an aspirator pump uses water to draw out air. These can run from $20-800+, but they need a source ofnrunning water and the water has to remain cold. You should have a cold trap on your vacuum line. They run $35 and up but will increse the lifespen of your pump significantly and improve the air quality by absorbing some chemicals into water

 

[SunDay]

Thank you for detailed answer! My pump goes with oil, its not works for this chem, when i open the oil valve it shoots all waste around, and after oil change its works much less time, then again need to change oil.. Its not good when on the process. maybe you could drop a link of a watter vaccum like you said? I

 

[SunDay]

Okay, I thought about trap. How about if i use vacuum pump, but between pump and buchner will place a trap..? And what solution I should use in trap, to catch dcm or acetone?

 

[handle]

TRUMP announces the U.S will transition to the Metric system !.. so that be 711.2 mmHg.
My Vacuum pump setup is almost identical too NurdRage setup. can say it is workable with ice cold water flowing.

 

[Osmosis Vanderwaal]

Uh, did he do that? Thats fine with me I have math autism. It shreiked at 711.2mm/hg though, 740 mm/hg? 14.7psig? 1 tor? 740 pascals? All that dont matter anyway because unless younare on a boat in the ocean its all wrong. I'll tell you vacuum is some ofnthe least understood shit. Measuring it i mean. If at.mpressure isn14.7 psig and absolute vacuum is 0 psig, then when you pull a vacuum, is it negative psi? Do you say, " minus 13 pis, minus 13.5 psi, minus 14 psi, minus 14.5 psi, minus 14.6 psi, 0 psi. Of course you cant achieve 0 psi, but you see what im saying?. I'm just kidding around, don't take the red pill of pressure.

 

[handle]

erhhh , no, these things are immiscible
Common Sense / Trump

 

[Osmosis Vanderwaal]

Sometimes I have tomwonder who the fuck came upmwith some of these units, but on the other hand some make perfect sense. Like, what thenfuckmisna foot? Well its 12 inches, which goes into 360 evenly, so it sounds harmoneous to thenearth being sort of a circle, but who decided to devide a circle into 360 parts and why? What would happen if we decided to divide a circle into...369 parts? Wellnit would be more awesome incan see that, because it has 3, 6 and 9. Would it tune music down to A=432? You know, it actually might, although music was already 432 for longer than we have been using 440. Then theres obviously a link there to mopars infamous 440ci big block and its no coincidence that the highes model had a 6 pack carburetor, which is really 3 sets of 2, see, 3,6,9 again ( the 9 is for the dana 60 rear end, it's got a 9 inch ring gear) so now we know why those old chryslers are so fast, the goldden ratio, obviously. Backnto the foot, it's not 25.4 cm, thats 10 inches a foot is (25.4×12) 304.8mm, but 30 cm has nothing to do with 369, sonwhats the poi t?

 

[handle]

Thats right, measurement of 1 meter is defined by the distance your eyelids travels from open position to closed position that is 1 meter. where as 1 yard is defined as the distance that one of your eyelids (left one only) travels from the fully open position to the fully closed position, as long as your looking top dead centre* center*

 

[SoldadoDeDrogas]

All these different systems of measurement have been around and have come and gone for milennia. Sacred geometry/divine proportions comes from observing and measuring phenomena in nature and recording the patterns etc. Nobody made these up or decided their actual foot was going to be a standard unit one day. For example, it isn't a coincidence that there are 12 months, 12 apostles, 12 inches etc. The original system wasn't any one, but an ecclectic blend of all we know, it was a combination and there were formulas for conversions etc. If you go and look at alot of the monuments and monoliths and other sacred sites around the world you will find that they have measurements with all these proportions and ratios in these different systems of measuring, simultaneously. You'll notice these same numbers over and over, 3, 10, 12, 33, 48, 108, 555 etc. 432 is in there, fibonacci sequence, PHI/golden ratio 1-1.618, and many others - through different systems and disciplines, standard/metric etc. from music, architecture, engineering, astronomy to chemistry etc. when you go to compare them. This just scratches the surface of some very deep stuff if you're interested in these types of rabbit holes. The things people in high places don't want you to know.