strangespice
(Stranger) 05-28-00 01:44 No 10279 |
Proper forming of peracetic acid | Bookmark | ||||||
The info to prepare peracetic is hard to find. Perhaps one of you serious fellows would care to help? What I know; 1% H2SO4: GAA....stir 24h A journal said to heat the GAA up to 50 deg before adding 35% H202... is this kosher? I dont want a fucking space shuttle. Anyway....supposedly a longer time to form the epoxide is needed as well. 48 h vs 18 or so..... What I dont; ratio of this hyped up GAA to H202 if the pinacolone rearrangement steps are the same... I dont know why they wouldn't be. *&^%$# |
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strangespice (Stranger) 05-28-00 19:01 No 10528 |
Re: Proper forming of peracetic acid | Bookmark | ||||||
In the Aldrich catalog, it gives a warning about 32% peracetic acid exploding on heating..... so I assume you wont heat it...(!) ......but really, I am going to have to pester you all on every board until someone coughs it up...I know its floatin' around out there... its not like I havent looked. Organicum(my best text) gives perbenzoic prep, pertungstic prep, but no peracetic. Search engine yields SHIT. C'mon *&^%$# |
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hey_man (Pimp Master) 05-28-00 19:12 No 10530 |
Re: Proper forming of peracetic acid | Bookmark | ||||||
Doing a search on Rhodium's info site produces the following...
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Artful_Dodger (Newbee) 05-29-00 21:13 No 11097 |
Re: Proper forming of peracetic acid | Bookmark | ||||||
Ouch...feel like a school kid busted for not doing his homework |
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Nutmeg238 (Hive Bee) 06-01-00 17:25 No 12602 |
Re: Proper forming of peracetic acid | Bookmark | ||||||
I found this in US patent 2,692,271. Column 3 lines 6-32: Although peracids generally may be emplyed as epoxidizing agents, it will be found, as a practical matter, that peracetic acid will be the epoxidizing agent generally employed, and that acid has been used throughout the examples given hereinafter. The peracetic acid may be effectively prepared by reacting acetic acid with aqueous hydrogen peroxide in the presence of about 1% sulfuric acid as a reaction catalyst. The reaction proceeds with glacial acetic acid or aqueous acetic acid. The hydrogen peroxide may be the commercial 27.5% or 100 volume product or may be aqueous solutions of high peroxide content as, for instance, 50% to 90% H2O2. Peracetic acid may similarly be prepared by reaction of acetic anhydride with hydrogen peroxide by oxidation of aldehydes, U.S. patent 2,314,385, or by the method described in U.S. patent 2,490,800 issued December 13, 1949, to Greenspan. When employing the resultant peracetic acid as the epoxidizing agent, it is necessary to neutralize any strong acid, e. g. sulfuric acid, present as catalyst from its formation. This may be done either by neutralizing the sulfuric acid content with an alkali, such as caustic soda, or by buffering the solution with a material such as sodium acetate. Image replaced by text to facilitate archiving. Edited by Nutmeg238 6/20/00. ----------------------- Manual of Patent Examining Procedure Chapter 100 103 Right of Public to Inspect Patent Files and Some Application Files 37 CFR 1.11 Files open to the public (a) After a patent has been issued or a statutory invention registration has been published, the specification, drawings, and all papers relating to the case in the file of the patent or statutory invention registration are open to inspection by the public, and copies may be obtained upon paying the fee therefor. See Section 2.27 for trademark files. |
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Nutmeg238 (Hive Bee) 06-03-00 09:26 No 13294 |
Re: Proper forming of peracetic acid | Bookmark | ||||||
Also, they give an example in US patent 2802025 where CH3COOOH is made from CH3COOH, H2O2 and H2SO4 which are allowed to come to equilibrium in 12 to 16 hr. See also US patent 5098598 which discusses the stability of percarboxylic acids and US patent 4168274 which discloses a continuous epoxidation process which uses aqueous and organic phases. Also, search class 562 subclasses 2, 4 and 6 which covers percarboxylic acids and epoxidation. You can search it online at http://www.uspto.gov or if you're near the patent office go there and you can search all the way back to patent number 1. If you're near a patent office in another country they might have US patents......... |
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