Questions tagged [distillation]

For questions about the process of distillation. For the distillation process used in metal refining, also use the [metallurgy] tag.

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1answer
196 views

Fractional distillation of a product differs from the components listed in the SDS. What am I doing wrong?

I recently bought a product called Prestone De-Icer for Windows and Wipers which claimed to contain Methanol. I was puzzled when using it to note that it did not smell much like Methanol so I looked ...
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1answer
138 views

Would distilling a sodium fluoride solution generate hydrogen fluoride to any noticeable extent?

If you have a solution of NaF, and you boil it (to get pure water by distillation) can the fluoride ions in water separate from sodium ions and combine with hydrogen ions to form HF? ...
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0answers
697 views

How to get anhydrous triflic acid from triflic anhydride?

I require a small amount of triflic acid, and while other research groups do not have any, I did locate some trflic anhydride. Does anyone have a published protocol for obtaining the anhydrous acid ...
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2answers
551 views

How to purify water with activated carbon?

If I am not mistaken, distilling water does not remove all possible impurities. Chemicals with boiling points less than $100\ \mathrm{^\circ C}$ will be transferred as well. Does the usual tap water ...
3
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2answers
2k views

Condenser length?

I notice that Graham condensers tend to come in three main sizes: 200mm, 300mm and 400mm. What are the relative merits of each size? My typical application is vacuum distillation of organic solvents ...
2
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1answer
1k views

Most efficient way to purify household vinegar: distillation or freezing?

I am aware that there are better ways to purify acetic acid out of a water-acid mixture than these, but which one out of distillation (using heat) and fractional freezing (using cold) would gain a ...
5
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4answers
176 views

To heat or not to heat; distillation?

One of the questions in a recent past paper I completed was: One way to make water from the reservoir suitable for drinking is by distillation. Describe how water is distilled. And I answered ...
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1answer
294 views

How to separate benzyl alcohol and meta-cresol

Benzyl alcohol and meta-cresol boiling point's are not so different, the fractional distillation will be very difficult, what can i do for separate this two composites ?
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3answers
8k views

Cracking of dicyclopentadiene - was my simple Liebig condenser distillation setup adequate?

I recently did a distillation of dicyclopentadiene (bp 166 °C) to get cyclopentadiene (bp 40 °C). The setup as instructed by my supervisor consisted of a simple water-cooled Liebig condenser. Oil bath ...
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2answers
4k views

Denatured Ethyl Alcohol Purification

I have denatured ethyl alcohol which was obtained this formula; In 100 L ethyl alcohol there is 0.8 gr denatonium benzoate and 78 gr tert-Butyl alcohol. Is there any way to obtain absolute ethyl ...
2
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1answer
926 views

Deuterium depleted water through fractional distilation

Could a packed fractional still of the same type used to distill ethanol to 95% be used to produce deuterium depleted drinking water? The still has a 1000 watt electric heating element and has a ...
2
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1answer
74 views

Synthesis of phosphonate salt not working

I have tried four times in the past few weeks to synthesise 2-ethoxyvinyl phosphonyl dichloride by reacting ethyl vinyl ether with phosphorus pentachloride in toluene. I have been following the ...
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1answer
541 views

Fractional vs Simple distillation

After performing both simple and fractional distillations for a 50/50 mixture of methyl acetate/ethanol, i discovered that my total recovery (in mass) of substances after distillation was lower for ...
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2answers
2k views

boiling point and distillation relation

i need help with the fractional distillation method of a couple of substances at least more than two substances , just like air actually what am i looking for is that why do substances in air with a ...
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2answers
301 views

overall energy and the boiling point

i need help with the fractional distillation method of a couple of substances at least more than two substances , just like air actually what am i looking for is that why do substances in air with a ...
2
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1answer
191 views

Does Dean Kamen's Slingshot really filter virtually everything?

According to Dean Kamen (in the movie http://www.imdb.com/title/tt3242934/) and on the Net (http://www.popsci.com/article/science/pure-genius-how-dean-kamens-invention-could-bring-clean-water-millions)...
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1answer
80 views

opperating a distillation column far from flooding

I know that flooding will ruin the performance of a distillation column. There are many correlations (Eckert, kister, billet, etc.) that will tell you when a column will flood based on your fluid ...
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2answers
3k views
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1answer
859 views

Troubles with cinnemaldehyde extraction - A few general questions

I'm trying to do a cinnemaldehyde extraction. I've tried both a simple and a steam distillation. I'm using the video: [https://www.youtube.com/watch?v=bDoaPIKT_Xg] - as a guide. One of the main ...
3
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1answer
324 views

Freeze distillation: Does efficiency depend on solubility?

I was surprised to learn that freeze distillation has the same inefficiencies as vapor distillation: Namely, that it is impossible to get two miscible fluids to fully separate in one "pass" of ...
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1answer
2k views

Steam Distillation - Condensate not going through condenser

Basically what the title says. I set my equipment up exactly like pretty much every diagram I could find. There's condensation through the claisen adapter and into the distillation adapter, but for ...
6
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1answer
618 views

steam distillation of 4-bromoaniline , why render it basic prior

In the multistage synthesis of 4-bromobenzenamine, why must the solution be rendered alkaline prior to the steam distillation after the hydrolysis of 4-bromo-N-ethanoylbenzenamine?
4
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1answer
953 views

Simple distillation & azeotropes

In my organic chemistry lab, we recently had an experiment where we were given a mixture of 50:50 ethanol & ethylene glycol. We were supposed to perform a simple distillation to calculate the ...
2
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1answer
1k views

Vacuum-jacketed distilling column

I was looking for some distillation equipment on Sigma Aldrich because I wanted to perform some vacuum distillation, when I came across a vacuum-jacketed distilling column. Now as far as I understood ...
5
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1answer
149 views

Drying a distillate liquid

So I'm carrying out the distillation of some essential oil and I have to remove the water content in it. The usual method is using diethyl ether but I'm looking for a greener method. What can I do?
2
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1answer
122 views

Is the 'sweat' on the side of bottles distilled water?

Are the water droplets that form on the side of water bottles (or other drink containers) distilled water? Assume that the sides of the container are completely clean.
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1answer
144 views

Extract acid from a solution

I have a solution containing glucose and some sulfuric acid. I want to distill out the sulfuric acid to then reuse it for other purposes. The problem is the presence of glucose in the solution. I'm ...
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2answers
2k views

Internal vs external steam distillation

To extract essential oils from plant matter (amongst other purposes), steam distillation is often used. I've seen a lot of different glassware setups for this. I've sometimes seen them broken into two ...
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1answer
334 views

How to remove dichlorometane from water?

I will have water that have been through dichloromethane. Doing so, the dichlorometane (solubility $2~\%$) will contaminate my water by forming an azeotrop which will have a $38~\mathrm{^\circ C}$ ...
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1answer
537 views

Fractional Distillation

Why does the long length of the fractionating column in fractional distillation enable more effective separation of two liquids in a mixture? (basically what's the purpose of the fractionating ...
11
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2answers
6k views

Proper use of vacuum pump during vacuum distillation

I am preparing to do a vacuum distillation and am unsure exactly how to manage the vacuum. The vacuum pump I have is a two-stage rotary vane pump which is capable of 250 microns or lower. It has a ...
7
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1answer
1k views

Vacuum distillation apparatus selection and configuration

I want to assemble a "hobbyist-level" vacuum distillation apparatus for extracting small volumes of "typical" solvents (e.g., water, alcohols, ketones, diols). I already have standard lab glassware ...
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0answers
192 views

Can I use a Liebig condenser for condensing sulfuric acid?

I have a Liebig condenser but I read that the air cooled condenser is preferred for high temperature boiling points. My question is whether I can still use my Liebig with minimal risk... Should I just ...
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1answer
350 views

Precipitate Sodium Hypochlorite from tap water before distillation

Is there a fairly simple way to precipitate Sodium Hypochlorite from tap water before I distill it? Or, second best, a way to neutralize it?
3
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1answer
8k views

How to calculate mole ratio of two volatile compounds in distillation?

I have two volatile compounds (such as ethyl acetate and ethyl propionate). I am going to separate these compounds by simple and fractional distillation. How do I calculate mole ratios of the two ...
5
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1answer
107 views

N2O production vs air distillation

After producing nitrogen by distilling air, how is that nitrogen used with the oxygen to yield nitrous oxide ($\ce{N2O}$)? I see $\ce{N2O}$ available in different purities from various suppliers, but ...
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3answers
9k views

Isopropyl alcohol forming peroxides

I read in many MSDS that Isopropyl alcohol tends to form peroxides (by reacting to air OR light) which may explode when they reach a given concentration. For example: http://nj.gov/health/eoh/rtkweb/...