Elementary (Hive Addict)
04-15-02 09:47
No 297224
      From Anti-freeze to Acetaldehyde  Bookmark   

Ethylene glycol + HCl > Ethylene Chlorohydrin
Ethylene + Cl2 and H20 > Ethylene Chlorohydrin

Ethylene Chlorohydrin + Alkali > Ethylene Oxide

Catalytic Isomerization to Acetaldehyde

Aluminum oxide (Al2O3), phosphoric acid and phosphates, iron oxides, and, under certain conditions, silver, catalyze the isomerization of EO to acetaldehyde.

More Info

Post 297178 (Elementary: "Alkylene Oxides from Glycols", Novel Discourse)
Patent GB1036130

Nobodys home
(Old P2P Cook)
04-15-02 09:53
No 297231
      For academic purposes?  Bookmark   

Seems a tough route to take to make acetaldehyde. Most people would probably just oxidize ethyl alcohol.
(Hive Addict)
04-15-02 10:00
No 297237
      Cheaper ?  Bookmark   

Ethylene glycol is a lot cheaper than ethanol (no duty)

Nobodys home
(Hive Prodigy)
04-15-02 13:38
No 297338
      Perhaps in the UK  Bookmark   

You dont have stabdard 70% EtOH as a household cleaner/antiseptic?


Vivent Longtemps La Ruche!
(Hive Addict)
04-15-02 14:21
No 297362
      No not in the UK  Bookmark   

We have vodka and methylated varieties only, not even everclear available to the common household.

(as far as I know !)

Nobodys home
(Hive Prodigy)
04-15-02 14:38
No 297366
      Ok, I didn't know.  Bookmark   

Ok. As my last offtopic suggestion for the casual reader, I then think that it would be much easier to brew ethanol from fermentation of sugars and baker's yiest, followed by distillation, and weak oxidation to acetaldehyde.

Just my opinion on feasability. And with that, I must say that your idea is pretty clever. smile


Vivent Longtemps La Ruche!
(Master Searcher)
04-15-02 16:28
No 297400
      pinocol rearrangement  Bookmark   

Could you do a pinocol rearrangement of ethylene glycol to get acetaldehyde?

The hardest thing to explain is the obvious
04-17-02 01:25
No 298089
      Not worth the risk?!  Bookmark   

From the ethylene oxide MSDS:
explosive limits: 3-100%, flash point <-18C, boiling point 10.4C

They use ethylene oxide as the fuel in these big fuel-air-bombs.

It's also said to be incompatible to temps above 52C, oxidizers, ALKALIS, acids, alkohols, mercaptams, copper, SILVER, magnesium, mercury and their salts.