Search International and National Patent Collections

1. (WO2018200032) USING PRESSURIZED WET GAS LINES TO AVOID FOULING IN PURIFIED TEREPHTHALIC ACID (PTA) FILTERS AND LINES

Pub. No.:    WO/2018/200032    International Application No.:    PCT/US2017/063433
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Nov 29 00:59:59 CET 2017
IPC: C07C 51/42
C07C 51/47
C07C 51/487
C07C 63/04
C07C 63/26
C07C 63/15
Applicants: BP CORPORATION NORTH AMERICA INC.
Inventors: KEYES, Timothy H
BARTOS, Thomas
Title: USING PRESSURIZED WET GAS LINES TO AVOID FOULING IN PURIFIED TEREPHTHALIC ACID (PTA) FILTERS AND LINES
Abstract:
Processes for recovering a purified aromatic carboxylic acid include contacting a crude aromatic carboxylic acid with hydrogen in the presence of a catalyst in a hydrogenation reactor to form a purified aromatic carboxylic acid; crystallizing the purified aromatic carboxylic acid to form a solid/liquid mixture comprising purified aromatic carboxylic acid solids; filtering the solid/liquid mixture in a rotary pressure filter apparatus to remove a liquid filtrate, washing the solid/liquid mixture in the rotary pressure apparatus with a wash fluid to form a washed solid/liquid mixture, and drying the washed solid/liquid mixture in the rotary pressure apparatus with an inert gas to form a filter cake comprising purified aromatic carboxylic acid solids and a wet gas stream; withdrawing the wet gas stream from the rotary pressure filter apparatus while maintaining the wet gas stream at a pressure above ambient; and recovering the purified aromatic carboxylic acid solids from the filter cake.