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Synthesis of Phenylacetic Acid From Benzyl Cyanide (large scale)

WillD

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Jul 19, 2021
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YiBrQSFtLu

Equipment and glassware:

Reagents:

  • Water 725 l;
  • Sodium hydroxide (NaOH) 75 kg;
  • Benzyl cyanide 300 kg;
  • Hydrochloric acid (HCl aq 37%) 70 l;
  • Activated carbon 14 kg;

Reaction Scheme
TFX7k9263g

Synthesis
1. Water 650 l and sodium hydroxide (NaOH) 75 kg are added into a batch reactor.
2. Stirring is turned on for 2 h.
3. Benzyl cyanide 300 kg is added into the reactor.
4. The reaction mixture is maintained to a temperature 100 ℃.
5. The reaction mixture is stirred for 9 h.
6. Water 75 l is added into the reactor.
7. The reaction mixture is cooled down to 20 ℃.
8. Hydrochloric acid (HCl aq 37%) 70 l is poured into the reaction mixture in order to reach pH 6, temperature 20 ℃ has to be maintained.
9. Activated carbon 14 kg is then added to the mixture.
10. The reaction mixture is heated to a temperature 65 ℃.
11. This temperature is maintained with stirring for 30 min.
12. The reaction mixture is then moved into crystallization dishes through a
nutsche-filter.
13. Than, cooled down to temperature 10 ℃.
14. At this temperature and stirring, phenylacetic acid is released by 37% hydrochloric acid at pH 1-2.
15. Phenylacetic acid crystallization takes about 2 h.
16. The reaction mass is moved to a centrifuge after crystallization, pressed and washed on a vacuum filter with cold water.
 
Last edited by a moderator:

Jack

Don't buy from me
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Can you post a link to the source of this information,
and what is the purpose of the activated carbon step? Is this personal experience?
 

WillD

Expert
Joined
Jul 19, 2021
Messages
645
Reaction score
889
Points
93
Can you post a link to the source of this information,
and what is the purpose of the activated carbon step? Is this personal experience?
JackThere is no article on this subject, this is a production moment. If you are interested in practicing this synthesis, I will help.
 
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