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Author: Subject: pentaerythritol from paint
dynamite
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[*] posted on 24-4-2003 at 14:47
pentaerythritol from paint


I found out that thing like colourles paint is polyconde... product pe+1,2bensendicarboksylacid. alkyd colorlespaint pentaftal... does someone has any ideas how to remowe pe sorry obout this mes.
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KABOOOM(pyrojustforfun)
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[*] posted on 15-7-2003 at 18:57


it's a ester so dissolve in dilute H2SO4 then add exess Ca(OH)2 filter then let the filtrate to evaporate.
edit : first add lime then sulfuric acid (dilute solutions)
u want PETN? don't isolate PETN. add your PEester to conc HNO3

u'll get PETN. u need less Nitric acid than when PE is used!!

because less water is generated
C((OCO)2C6H4)2(CH2OH)2 + 4HNO3 => C(CH2ONO2)4 + C6H4(COOH) +

2H2O
:cool:

[Edited on 4-8-2003 by KABOOOM(pyrojustforfun)]
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narkar
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[*] posted on 5-2-2004 at 17:19


can it be done as a soap boiling?2C6H4(COO)2)(CH2)4C (pentaerythritol diphthalate)+4NaOH and XH2O. Disodium phthalate is water soluble PE. low soluble?
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KABOOOM(pyrojustforfun)
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smile.gif posted on 7-2-2004 at 20:19
I was wrong


firstly I think the compound was something like C(CH<sub>2</sub>OH)<sub>3</sub>CH<sub>2</sub>OOCC<sub>6</sub>H<sub>4</sub>COOH secondly nitrolysis may not take place cause it's a aromatic carboxylic acid 3dly Ca(OH)<sub>2</sub> may not work well, due to its low solublity in water
NaOH is a better choice:
<blockquote>quote:<hr>can it be done as a soap boiling?2C6H4(COO)2)(CH2)4C (pentaerythritol diphthalate)+4NaOH and XH2O. Disodium phthalate is water soluble PE. low soluble?<hr></blockquote>PE is quite soluble in water. I would add excess CaCl<sub>2</sub> after soap boiling, let every thing evap then add alcohol and let stand for some hour then filter. the NaCl, Ca(OH)<sub>2</sub>, Ca(OOC)<sub>2</sub>C<sub>6</sub>H<sub>4</sub>, and the excess CaCl<sub>2</sub>hydrate don't dissove in alcohol




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