Talk:Fractional distillation

message: Who uses a bunsen burner as the heat source for a fractional distillation? Most of the time, you risk setting your lab bench on fire! —Preceding unsigned comment added by 64.53.218.27 (talk • contribs) 7 February 2006 (UTC)
:...I use one. Kilo-Lima|(talk) 14:32, 23 April 2006 (UTC)
replies: text: Depends what you're fractionating really. Then again, strictly speaking it's probably safer to move away from the open flames, but if you need fast powerful heat...GreatMizuti 13:47, 29 July 2006 (UTC)
replies: text: I have never, ever seen a bunsen burner used for destillation. That was an ancient practice. 70ies? 50ies? WWII? --Maxus96 (talk) 21:21, 28 August 2016 (UTC)
replies: text: I routinely did it in the 90s, and still do occasionally for special purposes...hard to beat a micro-burner for quick high heat at a small spot on weirdly shaped vessels. DMacks (talk) 21:27, 28 August 2016 (UTC)
thread_title: Bunsen Burner

message: I deleted the expansion stub because:
* I expanded the article by adding a schematic diagram and a discussion of reflux used in large-scale industrial towers.
* I expanded the "See also" section considerably by adding links to the articles that deal with the various other types of distillation such as azeotropic distillation, freeze distillation, extractive distillation, etc.
In my personal opinion, what this article needs is to downplay its focus on laboratory-scale glassware distillation and upgrade its focus on the use of large-scale fractionators in industry.  Perhaps that could be done by simply reversing the location of the glassware section and the industrial section?? What do others think? - mbeychok 00:08, 5 June 2006 (UTC)
thread_title:  Deleted expansion stub 

message: Is it possible to use a spiral for the column?Arnero 19:01, 22 October 2006 (UTC)
replies: text: Arnero, If you are asking about industrial fractionators, I don't understand what you mean by a spiral. Industrial fractionators (or distillation columns) usually use vapor-liquid contacting devices known as trays (or plates) or some type of packing.  There are various types of trays ... the most prevalent are those using either bubble caps or valve caps. As for packing (as noted in this article), it may be random dumped packing or structured sheet metal. - mbeychok 19:25, 22 October 2006 (UTC)
replies: text: I suspect he's thinking of a graham condenser (for example, this Ace Glass item ). That's very good for condensing a vapor, due to lots of thermal contact with the cooling jacket, but I don't know why it would be a good for the fractionating column.  Alternatively, there are spiral packing techniques for straight Liebig condensers. DMacks 08:00, 23 October 2006 (UTC)
thread_title:  Trays 

message: While reading this article i came across the following section:
"Alternate set-ups may utilize a "cow" or "pig" which is connected to three or four receiving flasks. By turning the "cow" or "pig", the distillates can be channelled into the appropriate receiver. A Perkin triangle is versatile piece of apparatus that can be also be used to collect distillation fractions which does not require a cow" or "pig" adaptor. A Perkin triangle is most often used where the distillates are air-sensitive or where the fractions distil and are collected under reduced pressure, but can be used for a simple and fractional distillation."
Now, i assume that cows and pigs refer to some kind of chemistry equipment, mabey glassware or whatever. However, without previous knowledge of the subject and no links, it makes this segment confusing at best. perhaps someone who actually knows what this means can throw a link or two in there? 204.82.251.197 (talk) 14:30, 9 February 2009 (UTC)
thread_title:  On the farm 

message: in the intro, it says that if the boiling point difference is greater than 25ºC, simple distillation is used. simple distillation cannot produce a reasonably pure (<5% impurities) sample unless the boiling point difference is greater than 100ºC. According to Introduction to Organic Laboratory Techniques: A Small-Scale Approach (ISBN:978-0534408336), 108ºC is required to achieve separation by simple distillation. There is a table in the book (page ~751) that has a list of how many boil/condense cycles are required for various boiling point differences. It also calls the boil/condense cycles that occur in the column "theoretical plates." the table ranges from bp difference of 108º with 1 theoretical plate to a bp difference of 2º which requires 100 theoretical plates.  —Preceding unsigned comment added by 71.92.101.14 (talk) 04:59, 2 October 2009 (UTC)
thread_title:  25º? 

message: The first line as written isn't strictly correct. There are at least a couple things wrong with it, and I believe the most important is the omission of the use of the term fractionating column, since fractional distillation is distinguished from other types of distillation based on the use of a fractionating column such as a Vigreux column, not the fact that it's a method of separating mixtures into fractions. All types of distillation separate the pot into fractions, so this is not characteristic of fractional distillation. Also not entirely correct is the description of the mixture. This technique will give fractions of a pot but not if one of the components of a mixture is, say, a gas. A gas will leave open apparatus and escape and not be captured as a fraction. Very often, fractionation of liquids is wanted. "A mixture" without further characterization is very general. I am willing to rework the first three sentences if no one else would like to take the opportunity to do so. I will come back in a few days to see if an edit has been made, and if not I'll give it a shot.
2603:900A:1C0B:7700:9D9F:26BA:28CF:552B (talk) 09:08, 14 April 2019 (UTC)
thread_title:  First line correct 

message: I think nonplussed is the adjective that describes my mental state, upon noticing our lack of not (only an article, but in fact) even of a redirect, for this perfectly predictable consequence of the topic-worthiness of the accompanying article. I hasten to add that even tho I may in fact be nuckin' futz, there is at least an insane logic to my assertion, and I may even explicate that before  shuffling off this [[wikt:mortal coil]|].--JerzyA (talk) 23:42, 30 June 2019 (UTC)
replies: text:    Oh, yeah: (It's tuff, when can't edit away yr talk typos, which, if I groused abt editing facilities on talk page's being inadequate, is the other side of the coin abt editing talk being sadly identical wit editing an article. (1)I predict that no one will give a damn abt my long thot analysis of the design issues, as editor/software-engineer (2) I can't guess whether (2a) That's fine, bcz there are still pros at WMF with adequate free attention to work it out, or (2b) that's tragic bcz fanboys seem adequate to maintain process and initiative, despite Hari Selden's lamented retirement and decline, or (2b) tragic, bcz real imaginative and professional  programming and data-management capabilities have still not been pushed to a point where the pro bono publica structures in place can continue to exploit the continuing refinement and elaboration of the underlying concept toward its full realization.IMO, history favors stagnation, but we can only, predict, and kick in our  own. two-bits, whether of hope and perhaps new heights, and/or of despair.and perhaps stagnation ending in collapse.--JerzyA (talk) 04:06, 1 July 2019 (UTC)
replies: text:    : :For example (Re le esprit d'escalier:) I wrote, probably  Hari Selden and the best I can do about it is to append comments like this. If I were as clever as I like to imagine, I'd have written some WP:essays since the early days, and exploited the wiki capabilities more in the WP:wikipedia nanespace, instead of composing essays on talk pages. Too late?.----JerzyA (talk) 04:41, 1 July 2019 (UTC)
thread_title:  [[Fractional condensation]] 

message: What is a fractional distillation 2409:4043:91B:BEFE:0:0:29E:E0AC (talk) 06:18, 25 March 2022 (UTC)
thread_title:  Science 

message: Which is the distillate of fractional distillation 102.7.80.12 (talk) 07:13, 4 July 2022 (UTC)
thread_title:  Chemistry