DanielDaniels
Badges: 14
Rep:
?
#1
Report Thread starter 3 years ago
#1
I knew the answer is solvent extraction, but cannot confidently justify why the other three are not correct. Any help please?
Attached files
0
reply
Protoxylic
Badges: 14
Rep:
?
#2
Report 3 years ago
#2
Generally extraction through reflux is used in line with a Soxhlet extractor, to justify the use of a soxhlet extractor is to know the solubility of your product versus possible impurities in a particular solvent. In this case, an aromatic ester will most likely be soluble in many organic solvents such as DCM or Ethyl Acetate. Extremely limited solubility will warrant the use of a Soxhlet extractor which refluxes the solvent to increase solubility.

Filtration is used, clearly, when your product is insoluble in a particular solvent. In this case, you have a two-phase mixture of an aqueous system (the acid, now neutralised by the base). So this isn't correct.

Recrystallisation is a purification process that could be used after extraction if your product is crystalline at room temperature, for this we ideally need a single phase solvent system - not a mixture of water and organic solvent. So this isn't correct.

Solvent extraction is probably one of the most common extraction processes used, it's the first stage of processing which is to remove many impurities that are soluble in water (and to remove water itself) and not soluble in organic solvents - or less commonly, vice versa.

Spoiler:
Show

The impurities removed here would be water, sodium benzoate and dissolved carbon dioxide along with some of the nitro benzoic acid. In your organic phase you will have your product benzoic ester and some starting material nitro benzoic acid
1
reply
DanielDaniels
Badges: 14
Rep:
?
#3
Report Thread starter 3 years ago
#3
(Original post by Protoxylic)
Generally extraction through reflux is used in line with a Soxhlet extractor, to justify the use of a soxhlet extractor is to know the solubility of your product versus possible impurities in a particular solvent. In this case, an aromatic ester will most likely be soluble in many organic solvents such as DCM or Ethyl Acetate. Extremely limited solubility will warrant the use of a Soxhlet extractor which refluxes the solvent to increase solubility.

Filtration is used, clearly, when your product is insoluble in a particular solvent. In this case, you have a two-phase mixture of an aqueous system (the acid, now neutralised by the base). So this isn't correct.

Recrystallisation is a purification process that could be used after extraction if your product is crystalline at room temperature, for this we ideally need a single phase solvent system - not a mixture of water and organic solvent. So this isn't correct.

Solvent extraction is probably one of the most common extraction processes used, it's the first stage of processing which is to remove many impurities that are soluble in water (and to remove water itself) and not soluble in organic solvents - or less commonly, vice versa.

Spoiler:
Show


The impurities removed here would be water, sodium benzoate and dissolved carbon dioxide along with some of the nitro benzoic acid. In your organic phase you will have your product benzoic ester and some starting material nitro benzoic acid

Thanks a bunch really. That's what i am looking for. Well explained
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How do you prefer to get careers advice?

I like to speak to my friends and family (15)
11.03%
I like to do my own research online using careers specific websites (87)
63.97%
I like speaking to the careers advisors at school, college or uni (18)
13.24%
I prefer to listen watch videos or listen to podcasts of people in my chosen career (13)
9.56%
Something else (let us know in the thread) (3)
2.21%

Watched Threads

View All
Latest
My Feed