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I think it is important to include Robert Stein in the history of the column still as his model the patent still invented in 1827 was improved on by Coffey. —Preceding unsigned comment added by 59.167.231.150 ( talk) 05:27, 29 February 2008 (UTC)
The last paragraph mentions that this still doesn't filter out higher boiling point contaminants. Is this true??? I thought methanol had a lower boiling point than alcohol 66.64.248.162 ( talk) 23:26, 21 July 2008 (UTC)
The azeotrope is the 4% of ethanol-water compound. It has a lower BP than either of its parents. The BP of this azeotrope is lower than 78.37C. If an azeotrope is formed, it is always the first fraction. The first column of the Coffey still is now known as a reflux column. This type of still is used to make 96% pure ethanol. The hot distillate is then flavored and diluted with water. Gin and vodka are examples of such flavored spirits. There is little point in removing the azeotrope, via chemical drying, as water is later added in production. — Preceding unsigned comment added by 220.244.73.231 ( talk) 23:27, 15 April 2014 (UTC)
Why is there mention of a continuous still planted in the middle of an article on column stills? Confusing. Clarification needed.-- 69.122.62.231 ( talk) 14:49, 3 December 2009 (UTC)
I'm afraid I can't fully grasp how the process works as the explanation in the text is unclear and sometimes ambiguous and possibly contrary to the diagram, which has a key but no explanation, including regarding which are wanted an which waste products.
The diagram lists the first stage as wash entering the rectifier but in the article text the rectifier (with a clearly incorrect link to the electrical device) is confusingly referred to as the second rather than the first column. The wash is shown descending the rectifier in a zig-zag or spiral but what is this achieving?
What is the "liquid out" at stage 3 in the diagram ((largely) condensed steam?) and is it a wanted or waste product?
When the alcohol vapour from stage 4 goes to the rectifier, what happens there? The article text states that "it circulates until it can condense at the required strength" but how does this come about? Are the "Most volatile components" removed at stage 6 of the diagram the desired end product? What are the "Recycled less volatile components" at stage 5 and are they recycled as they have a higher water content which can then be reduced further in recycling?
Why doesn't the addition of steam to the analyser simply further dilute the wash, defeating the object of the whole process?
The article states that "Column stills behave like a series of single pot stills, formed in a long vertical tube". Are we talking about the whole mechanism here, the analyser alone or something else? What is a bubble plate?
The link to analyser in the article text appears to be in need of disambiguation.
I potentially have some further points which require clarification but they are dependent on the answers to the above. Mutt Lunker ( talk) 10:35, 29 May 2011 (UTC)
This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||
|
It is requested that a mechanical diagram or diagrams be
included in this article to
improve its quality. Specific illustrations, plots or diagrams can be requested at the
Graphic Lab. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. |
I think it is important to include Robert Stein in the history of the column still as his model the patent still invented in 1827 was improved on by Coffey. —Preceding unsigned comment added by 59.167.231.150 ( talk) 05:27, 29 February 2008 (UTC)
The last paragraph mentions that this still doesn't filter out higher boiling point contaminants. Is this true??? I thought methanol had a lower boiling point than alcohol 66.64.248.162 ( talk) 23:26, 21 July 2008 (UTC)
The azeotrope is the 4% of ethanol-water compound. It has a lower BP than either of its parents. The BP of this azeotrope is lower than 78.37C. If an azeotrope is formed, it is always the first fraction. The first column of the Coffey still is now known as a reflux column. This type of still is used to make 96% pure ethanol. The hot distillate is then flavored and diluted with water. Gin and vodka are examples of such flavored spirits. There is little point in removing the azeotrope, via chemical drying, as water is later added in production. — Preceding unsigned comment added by 220.244.73.231 ( talk) 23:27, 15 April 2014 (UTC)
Why is there mention of a continuous still planted in the middle of an article on column stills? Confusing. Clarification needed.-- 69.122.62.231 ( talk) 14:49, 3 December 2009 (UTC)
I'm afraid I can't fully grasp how the process works as the explanation in the text is unclear and sometimes ambiguous and possibly contrary to the diagram, which has a key but no explanation, including regarding which are wanted an which waste products.
The diagram lists the first stage as wash entering the rectifier but in the article text the rectifier (with a clearly incorrect link to the electrical device) is confusingly referred to as the second rather than the first column. The wash is shown descending the rectifier in a zig-zag or spiral but what is this achieving?
What is the "liquid out" at stage 3 in the diagram ((largely) condensed steam?) and is it a wanted or waste product?
When the alcohol vapour from stage 4 goes to the rectifier, what happens there? The article text states that "it circulates until it can condense at the required strength" but how does this come about? Are the "Most volatile components" removed at stage 6 of the diagram the desired end product? What are the "Recycled less volatile components" at stage 5 and are they recycled as they have a higher water content which can then be reduced further in recycling?
Why doesn't the addition of steam to the analyser simply further dilute the wash, defeating the object of the whole process?
The article states that "Column stills behave like a series of single pot stills, formed in a long vertical tube". Are we talking about the whole mechanism here, the analyser alone or something else? What is a bubble plate?
The link to analyser in the article text appears to be in need of disambiguation.
I potentially have some further points which require clarification but they are dependent on the answers to the above. Mutt Lunker ( talk) 10:35, 29 May 2011 (UTC)