C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/617
C07C 37/07 (2006.01) C07C 37/50 (2006.01) C07C 39/15 (2006.01)
Patent
CA 1334978
A process is disclosed which is capable of producing p,p'-biphenol of high purity by the dealkylation reaction of 3,3',5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl and which yet allows isobutene to be recovered in high yield. The process performs the dealkylation reaction of 3,3',5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl in the presence of an acid catalyst using as a solvent a saturated hydrocarbon having a boiling point of 190°C or above,an alicyclic hydrocarbon having a boiling point of 190°C or above, a hydrocarbon with an iodine value of no more than 1, sulfolane, or a mixture of these solvents. Also disclosed is a process for producing p,p'-biphenol from a mixture of 2,6-di-t-butyl-phenol and 3,3',5,5'- tetra-t-butyl-4,4'-diphenoquinone or from a mixture of 2,6-di-t-butylphenol, 3,3',5,5'-tetra-t-butyl-4,4'- diphenoquinone and 3,3',5,5'-tetra-t-butyl-4,4'- dihydroxybiphenyl. In this process, the synthesis of 3,3',5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl by the redox reaction between 2,6-di-t-butylphenol and 3,3',5,5'- tetra-t-butyl-4,4'-diphenoquinone and the production of p,p'-biphenol by the dealkylation reaction of 3,3',5,5'- tetra-t-butyl-4,4'-dihydroxybiphenyl are performed at one stage in the presence of both an acid catalyst and a solvent at a temperature of 120 - 280°C.
577983
Ishibashi Masayasu
Kurano Yoshito
Tanaka Michio
Taniguchi Katsuo
Ltd. Mitsui Petrochemical Industries
Smart & Biggar
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