prov:value
| - In fact, however, naphtha oil used as one of the starting materials for the reaction contemplated by the present invention contains solvents such as benzene, toluene, xylenes, propylbenzenes, trimethylbenzenes, tetramethylbenzenes, indan, methylindans, etc. and these solvents resulting to ensure not only constant progress of the reaction but also ease in agitating operations and recovery of the co
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