METHOD OF PRODUCING INSULATING OIL COMPRISING DIBENZYLBENZENE

摘要

PCT No. PCT/JP90/00295 Sec. 371 Date Jan. 7, 1991 Sec. 102(e) Date Jan. 7, 1991 PCT Filed Mar. 7, 1990 PCT Pub. No. WO90/10686 PCT Pub. Date Sep. 20, 1990.An insulating oil comprising dibenzylbenzenes which is most suitably used for impregnating a metallized plastic film capacitor, is produced by the reaction of benzene or toluene with diphenylmethane or a methyl derivative thereof at 170 DEG C. to 400 DEG C. in the presence of a synthetic crystalline zeolite catalyst having a molar ratio of SiO2 to Al2O3 of 20 or above, wherein the inlets of main pores are constituted of ten-membered oxygen rings.