tecnetium
(Hive Bee) 09-11-01 02:20 No 212020 |
Possible MeOH and Formic acid synth | Bookmark | ||||||
Hi bees have a look at this reaction swim found in one of her textbooks: 50% NaOH 2HCHO -----------> CH3OH + HCOO-Na+ Plain old formaldehyde can be used to make MeOH (a handy solvent) and sodium formate. Clean up - Distill off MeOH (bp 65 C). Then distill off all the water. Then acidify with H2SO4 and distill off the formic acid (bp 100.5 C). Any comments? |
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Karl (Stranger) 09-11-01 03:45 No 212025 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
The H2SO4 could oxidise the formic |
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Chromic (Hive Addict) 09-11-01 16:19 No 212269 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
Maybe acidify with hydrochloric acid and boil off the azeotrope (which, btw has a higher BP than water or formic acid)? |
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Rhodium (Chief Bee) 09-11-01 16:45 No 212278 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
Exactly, acidify just until neutral with HCl, and distill off the azeotrope (22.5% formic acid, 77.5% water) with a boiling point of 107.1°C (higher than that of formic acid, 100.8° C or water, 100°C). Make sure enough water is present, and collect the 105-110°C fraction. |
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PEYOTE (Hive Bee) 09-12-01 05:28 No 212526 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
It's a simple dismutation.... |
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Chromic (Hive Addict) 09-12-01 18:25 No 212832 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
I take it 22% HCOOH can be used in a performic? |
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Rhodium (Chief Bee) 09-12-01 18:34 No 212837 |
Re: Possible MeOH and Formic acid synth | Bookmark | ||||||
I'd suggest distillation of it first to achieve the above mentioned azeotrope. 22% seems a little bit low, but maybe it still would work with good agitation of the reaction. |
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