B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
161/30, 182/60
B01D 33/06 (2006.01) B01D 33/073 (2006.01) B01D 33/09 (2006.01) B01D 37/00 (2006.01)
Patent
CA 1320148
72688-2 ABSTRACT OF THE DISCLOSURE A method for recovering crystals from a crystal- containing slurry by supplying the slurry to a rotary vacuum filter while rotating a cylindrical filter medium thereof to effect a first stage filtration, washing and a second stage filtration, which method comprises conducting a sucking filtra- tion while pressurizing the slurry side so as to maintain such temperature and pressure that the filtrate of the rotary vacuum 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 terephthalic acid crystalline products and can be applied also for the recovery of general crystalline products, such as hydroquinone, resorcin and so on from slurries of them.
600776
Mitsui Chemicals Incorporated
Smart & Biggar
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