CBSE Class 10 Answered
how BHA and BHT are formed?
Asked by richaverma914 | 08 Apr, 2015, 05:44: PM
Expert Answer
BHT (Butylated hydroxytoluene) is chemically derived from phenol.
Industrially, BHT is prepared by the reaction of p-cresol (4-methylphenol) with isobutylene (2-methylpropene) catalyzed by sulfuric acid.
- CH3(C6H4)OH + 2 CH2=C(CH3)2 → ((CH3)3C)2CH3C6H2OH
Alternatively, BHT is prepared from 2,6-di-tert-butylphenol by hydroxymethylation or aminomethylation followed by hydrogenolysis.
BHA (Butylated hydroxyanisole) is prepared from 4-methoxyphenol and isobutylene.
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