| 摘要 |
PCT No. PCT/JP89/00529 Sec. 371 Date Jan. 18, 1990 Sec. 102(e) Date Jan. 18, 1990 PCT Filed May 29, 1989 PCT Pub. No. WO89/11323 PCT Pub. Date Nov. 30, 1989.A method for recovering crystals from a slurry by supplying the slurry to a rotary sucking filter while rotating a cylindrical filter medium thereof to effect a sequence of operations of sucking filtration, washing and further sucking filtration, which method comprises conducting a sucking filtration while pressurizing the slurry side so as to maintain such a temperature and pressure that the filtrate of the rotary sucking filter will not reach a condition of supersaturation, whereby stuffing of the filter medium due to deposition of crystals from the mother liquor with increase in the slurry viscosity is prevented and the recovery of the crystals are realized efficiently over a long period of time. This method is suitable for recovering crude and purified crystals of terephthalic acid and can be applied also for the recovery of general crystilline products, such as hydroquinone, resorcin and so on from slurries of them.
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