Process and apparatus for slurry separation of aromatic carboxylic acid
View Patent ↗In a process for removing aromatic carboxylic acid from a slurry thereof in solvent, the slurry is split into sub streams and each of said sub streams is supplied to a respective rotary pressure filter such that the sub stream pass through the filters in parallel. Gas is passed through the rotary pressure filters in series in an open-loop arrangement.
1. A process for removing aromatic carboxylic acid from a slurry thereof in solvent comprising the steps of:
(a) splitting the slurry into sub streams and supplying each of said sub streams to a respective rotary pressure filter such that said sub streams pass through the filters in parallel; and
(b) passing gas through the rotary pressure filters in series in an open-loop arrangement.
2. The process according to claim 1 wherein a first and second filter are present; the slurry is split into two sub streams which are passed in parallel to the first and second filters; and the gas is passed initially to the first filter and subsequently to the second filter.
3. A process for the production of crude aromatic carboxylic acid comprising the process of claim 1 .
4. A process for the purification of crude aromatic carboxylic acid comprising the process of claim 1 .
5. The process according to claim 1 wherein the aromatic carboxylic acid is terephthalic acid or isophthalic acid.
6. Apparatus for the removal of aromatic carboxylic acid from a slurry thereof in a solvent comprising:
(a) a plurality of rotary pressure filters;
(b) means for supplying slurry to the filters in parallel; and
(c) means for supplying gas to the filters sequentially in series in an open-loop arrangement.
7. Apparatus according to claim 6 wherein the aromatic carboxylic acid is terephthalic acid or isophthalic acid.