Optimization of alkylphenols – intermediates in the oil dope production on the macroporous sulfokationite «Amberlyst 36 Dry»

The formation of alkylphenols, which are intermediates in the oil dope production (phenol alkylation by ethylene oligomers) in the presence of macroporous catalyst «Amberlyst 36 Dry» is studied. Sulphocationit «Amberlyst 36 Dry» is much simpler in comparison with the conventional catalyst KU2-8CHS, has more longer life, but also increases the speed, conversion and selectivity. We found that ethylene oligomers, containing the largest number of vinylidene olefins with internal double bond are most active in the alkylation. Linear α-olefins are much less active in the alkylation. The ratio of ortho- and para-isomers of alkylphenols is mainly determined by the structure of olefins and temperature, and unchanged with increasing duration of the process. Established that the rate of conversion alkylphenyl ethers alkylphenols depends on the structure of the alkyl radical of the ether. It is shown that the conversion rate of alkylphenyl ethers to alkylphenols depends on the structure of the alkyl radical of the ether. Alkylphenols fully complying with the specifications can be obtained with practically quantitative yield of oligomers of ethylene at 135 °C and a molar ratio of ethylene oligomers : phenol = 1: 6.

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