For questions regarding the separation process consisting in the separation of a substance from a matrix. This tag can be used for generic extraction of elements from ore or more specific types of extraction such as: Liquid-liquid extraction, and Solid phase extraction.

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2
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0answers
7 views

Limits on contaminant size in filtration for extraction, and standard alternatives?

Following up on How to perform solvent extraction of a solid I realized that I haven't quantified the size of the contaminants. I know they aren't soluble in acetone and the target is, but I don't ...
2
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1answer
37 views

How to perform solvent extraction of a solid

Suppose I have a solid compound from which I want to extract a target chemical I know is soluble in acetone. So I crush and mix the compound in acetone, dissolving the target and suspending the ...
16
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1answer
643 views

How can an inexperienced chemist determine the chemical structure of a molecule?

I'm a fairly inexperienced, but nonetheless interested chemist, currently planning a small project for the coming summer: I want to isolate an unknown chemical from a plant and determine it's chemical ...
3
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1answer
59 views

Using Distribution Coefficient to Determine Mass and Percent of Acid Extracted

The $K_\mathrm{D}$ (distribution coefficient) of coffee water at $25\,°\mathrm{C}$ is $7.8$ in a methylene chloride/water system. If there is $2.0\,\mathrm{g}$ of caffeine in $200\,\mathrm{mL}$ of ...
9
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1answer
119 views

When is Serpeck's process preferred over Bayer's process?

Both these processes are used in concentration of bauxite. They use different reagents. Which is more commonly used (wikipedia says Bayer's) and why? When is one preferred over the other? Which is ...
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0answers
28 views

What is an effective extraction solvent for removing hydrocarbons from soil (using a soxhlet extractor)?

I am interested in improving the extraction efficiency of hydrocarbons from soil using a soxhlet extractor, and I would like to know what solvents might improve this extraction efficiency, and why. ...
9
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2answers
9k views

How do I extract cyanide from apple seeds?

I'm working on a crime story about cyanide poisoning from apple seeds. I just would like to have an idea of what processes and extraction techniques might be involved in getting cyanide from the ...
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1answer
245 views

How to cheaply extract iodine from an alcoholic solution?

I have an alcoholic solution of iodine. My goal is to extract the pure iodine without using rare or expensive compounds. How could I do this?
9
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3answers
115 views

What possibilities are there for refining aluminium on the moon?

Engines burning aluminium and liquid oxygen have been investigated for use on the moon because there is plenty of both elements in the soil - about 13% and 40% of highland soil, respectively. ...
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2answers
28 views

Chemical reactions in SFE?

What are the chemical reactions and/or chemical processes that take place during SFE(supercritical fluid extraction)? Namely supercritical $\ce{CO2}$.
1
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1answer
564 views

Separation of Binary mixture?

I will be given a binary mixture containing two unknown compounds(the mixture could be either liquid or solid- I don't know yet). The plan of the experiment is to identify the two compounds. So my ...
3
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1answer
340 views

Why should one perform an extraction with multiple small portions of solvent as opposed to one large portion?

I'm performing a liquid liquid extraction on a 1 Liter water sample for GC analysis. The procedure calls for 3 extractions with $50~mL$ of $\ce{CH2CL2}$. Would one extraction with $150~mL$ produce ...
5
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1answer
154 views

Standard solution and extracted solution : same concentration?

Summary : I am currently testing how a certain type of foam adsorbs HAP, PCB and OCP, and to this end I am depositing some on the foam, then extracting it. To know how much was extracted, I need to ...
2
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1answer
135 views

Can lye be extracted from bamboo ash?

I know that the best source of lye is hardwood. A brief search tells me that Bamboo is considered a hardwood of the monocotyledon variety. I've done a lot of searching to find this answer, but I can't ...
2
votes
1answer
681 views

How does one separate ethanol from acetic acid using aqueous extraction?

Would you add in $\ce{NaOH}$, deprotonating the acid, and then wash the mixture in water, thereby removing the $\ce{Na^+}$ and $\ce{CH3O^-}$ ions in an aqueous layer? But then wouldn't the ethanol be ...
2
votes
1answer
153 views

Can we extract $KI$ from Lugol solution?

I want to extract the $KI$ component of the Lugol solution, is there a method to do it? If not, how can I make a $KI$ solution?
3
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1answer
2k views

Chemical methods to extract Oxygen from Rust

Let's say I have a large quantity of rust and want to extract the oxygen from it in a way that allows me to collect the oxygen in a container. What chemical process can I use to do this and what ...
11
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2answers
238 views

Can we process waste just by decomposing it to homogenous mass and extracting the elements from it?

I. e., what if we just burn trash completely or dissolve it in acid, get the resulting paste and extract pure chemical elements out of it by applying some physics and/or chemistry to it until no more ...
1
vote
1answer
57 views

Metal extraction by pyrolysis

There is a process named solar furnace pyrolysis which is used to reduce the oxides of various elements by concentrating solar energy. Oxygen is liberated but an oxide slag is left. $\ce{SiO2 -> ...
3
votes
1answer
355 views

How to extract elemental Bismuth from pepto bismol?

I was trying to isolate elemental bismuth from pepto bismol (bismuth subsalicylate) using the process seen here but after I added the HCl, instead of getting a pink foamy substance I got a white ...
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2answers
270 views

Can caffeine be separated from coffee?

Is there a way to extract caffeine from coffee completely?
3
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1answer
1k views

How to extract pure caffeine from tablets?

I have some caffeine tablets and I want to extract the pure caffeine from the rest of the ingredients (caffeine 200 mg. Inactive ingredients in order are corn starch, dextrose, dicalcium phosphate, ...
14
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3answers
1k views

67 failures at extracting acetaminophen from Excedrin(R)

I have adapted the lab experiment described in this J. Chem. Ed. article for the organic chemistry lab course I teach. In the past year, the first year of implementation, I have had 67 failures (100% ...