CrossxD
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phenophthalein
Is there way to make phenol from polystyrene and phthalic acid from PET, acetylsalicilic acid or benzene from household thinks??
Thanks for reply. 
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blogfast25
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Quote: Originally posted by CrossxD  | Is there way to make phenol from polystyrene and phthalic acid from PET, acetylsalicilic acid or benzene from household thinks??
Thanks for reply. |
Phthalic can be extracted from vinyl (pPVC) gloves, shower curtains and other soft PVC items (there are several threads on this forum about that).
Not from PET, which is a TEREphthalate.
[Edited on 6-7-2015 by blogfast25]
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Praxichys
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1. Phenol can be made by heating acetylsalicylic acid
2. Benzene can be made by heating NaOH and sodium benzoate
3. p-phthalic acid can be made by hydrolyzing PET ester with NaOH in ethylene glycol
You need m-phthalic acid for the phthalic anhydride needed for phenolphthalein condensation using phenol. You also need a strong lewis acid to
catalyze the reaction.
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Metacelsus
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Phenol from salicylic acid:
https://www.sciencemadness.org/whisper/viewthread.php?tid=27...
Phthalates from plastic:
http://www.sciencemadness.org/talk/viewthread.php?tid=25567#...
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gdflp
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| Quote: Originally posted by Praxichys |
You need m-phthalic acid for the phthalic anhydride needed for phenolphthalein condensation using phenol. You also need a strong lewis acid to
catalyze the reaction.
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Only ortho-phthalic acid can form a cyclic anhydride, m-phthalic acid cannot easily. Phenolphthalein is synthesized by condensing phthalic
anhydride(from dehydrating o-phthalic acid) with phenol and an acid catalyst.
[Edited on 7-6-2015 by gdflp]
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CrossxD
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Thank you very much, but what shower curtains have phthalic esters, how they look?
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UC235
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Soft, clear plastic that smells bad in most cases. Don't bother with shower curtains. My experiments found that they only contain ~10-15% plasticizer.
Vinyl gloves contain approximately 30% and are a much more viable source.
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CrossxD
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In my country are gloves made only from latex...:/
Only in pharmacy but they are expensive
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CrossxD
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Isn't strong lewis acid sulphuric acid?
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blogfast25
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| Quote: Originally posted by UC235 | | Don't bother with shower curtains. My experiments found that they only contain ~10-15% plasticizer. Vinyl gloves contain approximately 30% and are a
much more viable source. |
Hmmm... garbage shower curtain, garden hose, vinyl flooring etc contain less DOP but it will cost you less and you can get MORE if you're willing to
scale up a bit.
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aga
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The definition of what is a Lewis Acid is a bit different to what you might naturally assume.
https://en.wikipedia.org/wiki/Lewis_acids_and_bases
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CrossxD
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what are best solvents for phthalic esters?
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blogfast25
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Most lower alcohols are fine: MeOH, EtOH, IPA.
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CrossxD
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I found video where p. acid was made by oxidation o-xylene
is possible to separate xylene isomers?
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Praxichys
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| Quote: Originally posted by gdflp | | Quote: Originally posted by Praxichys |
You need m-phthalic acid for the phthalic anhydride needed for phenolphthalein condensation using phenol. You also need a strong lewis acid to
catalyze the reaction.
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Only ortho-phthalic acid can form a cyclic anhydride, m-phthalic acid cannot easily. Phenolphthalein is synthesized by condensing phthalic
anhydride(from dehydrating o-phthalic acid) with phenol and an acid catalyst.
[Edited on 7-6-2015 by gdflp] |
Derp. My bad. 1,2-benzenedicarboxylic acid. Kind of embarrassing to get o- and m- mixed up at this point.
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Nicodem
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Thread Moved
8-7-2015 at 11:25 |
CrossxD
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I recrystallized some acetylsalicylic acid and if I want to make from it salicylic acid I must reflux it with hydrochloric acid righ? Or I can leave
it for about day still?
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Texium
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| Quote: Originally posted by CrossxD | | I recrystallized some acetylsalicylic acid and if I want to make from it salicylic acid I must reflux it with hydrochloric acid righ? Or I can leave
it for about day still? |
Refluxing with 15% hydrochloric acid for a couple hours is your best bet. As you
cool the solution, the change will be obvious, as a ton of fluffy, needle-like crystals of salicylic acid will fall out which look very different from
ASA.
Boiling it in water would also work, but is a lot slower and less efficient.
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gdflp
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Refluxing with 15% HCl for hours is excessive. A reflux with very dilute HCl for a half hour will give a nearly quantitative yield of salicylic acid.
UnintentionalChaos described this procedure here. I have successfully replicated it several times with a slight modification.
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CrossxD
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and is better to use base ester hydrolysis or acid ester hydrolysis???
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Texium
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| Quote: Originally posted by gdflp | | Refluxing with 15% HCl for hours is excessive. A reflux with very dilute HCl for a half hour will give a nearly quantitative yield of salicylic acid.
UnintentionalChaos described this procedure here. I have successfully replicated it several times with a slight modification. |
Sorry, I know it is.
I like being through. 
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gdflp
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Acid hydrolysis is, IMO, less wasteful in respect to both chemical usage as well as time.
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CrossxD
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is acetone good solvent for phthalic esters?
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Oscilllator
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Yes, but You shouldn't use it for the extraction of them as PVC is highly soluble in acetone. They actually use it in conjunction with butanone to
weld PVC pipes. I used methylated spirits and the extraction went fine for me.
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CrossxD
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and what about make phthalic acid by oxidation xylen with hydrogen peroxide with some alkali hydroxide?
[Edited on 28-8-2015 by CrossxD]
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blogfast25
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| Quote: Originally posted by CrossxD | and what about make phthalic acid by oxidation xylen with hydrogen peroxide with some alkali hydroxide?
[Edited on 28-8-2015 by CrossxD] |
The only oxidation of ortho-xylene to phthalic acid that I know of is by means of potassium permanganate. 'UC235' has a very good YouTube
video on that synthesis:
https://www.youtube.com/watch?v=PAARYmBYudg
Hydrogen peroxide would not have the oxidising power needed, I think.
[Edited on 28-8-2015 by blogfast25]
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