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Author: Subject: Preparation of Phenol from Salicylic Acid
thebean
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[*] posted on 26-2-2014 at 17:30


Quote: Originally posted by DraconicAcid  
Quote: Originally posted by thebean  
Out of curiosity UC, how was the odor? I've heard that's rather indescribable but is sometimes equated to the smell of rotting fish.

That sounds more like pyridine than phenol.


I've heard them both described that way and wanted to clear it up for myself.




"You need a little bit of insanity to do great things."
-Henry Rollins
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[*] posted on 1-1-2019 at 03:25


I followed the procedure with 441 grams of salicylic acid. I observed large temperature swings when distilling the crude phenol. I think they were caused by further decarboxylation.

The distillation left behind salicylic acid residue. I decarboxylated the residue.

I obtained a good yield. It is not completely pure. Is phenol hard to fractionally distill?
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wg48
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[*] posted on 1-1-2019 at 07:14


Quote: Originally posted by thebean  
Quote: Originally posted by DraconicAcid  
Quote: Originally posted by thebean  
Out of curiosity UC, how was the odor? I've heard that's rather indescribable but is sometimes equated to the smell of rotting fish.

That sounds more like pyridine than phenol.


I've heard them both described that way and wanted to clear it up for myself.


I guess you have to be over 50 to know what Lifebuoy carbolic soap (a disinfecting soap containing phenol) smells like or how the soap factory at Port Sunlight on the Wirral England could be detected with your nose from miles away by the smell of the soap. LOL

https://en.wikipedia.org/wiki/Lifebuoy_(soap)




Borosilicate glass:
Good temperature resistance and good thermal shock resistance but finite.
For normal, standard service typically 200-230°C, for short-term (minutes) service max 400°C
Maximum thermal shock resistance is 160°C
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[*] posted on 1-1-2019 at 16:30


I redistilled my phenol through a short path condenser. I collected the fraction boiling between 179 C and 182 C. I obtained 188 grams of phenol melting at 40 C, 62.7%. It smells like sore throat spray.

A honey-colored oil remains in the distillation flask.
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lordcookies24
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[*] posted on 3-1-2019 at 11:17


This is the type of chemistry that I like. To make useful chemicals from normal everyday household items so I don't have to buy from chemical sellers
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XeonTheMGPony
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[*] posted on 5-1-2019 at 08:22


Quote: Originally posted by lordcookies24  
This is the type of chemistry that I like. To make useful chemicals from normal everyday household items so I don't have to buy from chemical sellers


It is cheaper to order in the end as you can not compete with industrial production.

I do recommend doing this stuff as it builds skill and experience, but for practical stuff better to order in bulk, when I order stuff I do it in 500 to 1Kg quantities
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[*] posted on 5-1-2019 at 09:06


Quote: Originally posted by XeonTheMGPony  

I do recommend doing this stuff as it builds skill and experience...


I agree completely. UC's experimental approach is a model for how to learn the most from an experiment. Without the benefit of IR, NMR, etc, he examines every possible explanation for his observations.




The single most important condition for a successful synthesis is good mixing - Nicodem
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