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Cyclopentanol is an important organic chemical intermediates, synthetic adipic acid method, but the pollution is serious, limited sources of raw materials, developed by a rich source of raw materials Cyclopentene cyclopentanol important significance. The the cyclopentene the direct hydration prepared cyclopentanol process of research, screening out the best catalyst and a solvent suitable for industrialization, on this basis, to optimize the process conditions. The screening of the catalyst in the phenol as a solvent in the reaction system, to examine the catalytic activity of 12 kinds of strongly acidic cation exchange resin, the initial screening of six kinds of high temperature the cation exchange resin. And then focus on the relationship of these six kinds of the catalytic activity and the temperature, and found that Amberlyst 35 and Amberlyst 36 best. On this basis, considering the various indicators of catalyst, filtering the optimal catalyst is of Amberlyst 36. As the solvent using phenol do Yi etherification reaction and the alkylation reaction occurs to produce high-boiling byproducts, the subject filter the reaction solvent. By examining a variety of alcohols, ketones, ethers, and other solvents for the hydration reaction, filtering out the best solvent for the butanol. Examine the impact of butanol as a solvent when the reaction temperature on this basis, the results show that when the reaction temperature was 150 ° C, the best effect of the hydration reaction. Amberlyst 36 as catalyst, as butanol as the solvent, and to optimize the reaction process. Examines the influence of the of cyclopentene and molar ratio of water, the catalyst content, the additive and the reaction time of the hydration reaction. Draw preferred reaction conditions: the molar ratio of cyclopentene with H2O 1:4, butanol and cyclopentene mass ratio of 1:1, a catalyst Amberlyst 36 an amount of 9% of the system mass, the reaction temperature is 150 ° C, the initial pressure of 1.20MPa, the stirring speed was 600rpm, reaction time 2h. Under the optimal reaction conditions, cyclopentyl alcohol in a yield of 11.90%, and the selectivity was 95.78%. In addition, the subject to study the stability of the catalyst, the results of Amberlyst 36 apply four times, although the yield is slightly decreased, but the selectivity has been maintained at a high level, the catalyst remains substantially stable. Compared with the literature, the subject of selection of the higher activity of Amberlyst 36 catalyst and a better stability of butanol as solvent, to avoid the time of the solvent using a phenol ether and alkylation side reaction, the yield and selectivity are maintained at a high level, while butanol lower boiling point, is more conducive to the post-processing, and suitable for industrialization.
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