PROCESS FOR THE PURIFICATION OF AROMATIC DICARBOXYLIC ACID

Title:

PROCESS FOR THE PURIFICATION OF AROMATIC DICARBOXYLIC ACID

Document Type and Number:

WIPO Patent Application WO/2012/038751

Kind Code:

A3

Abstract:

A process for the purification of aromatic dicarboxylic acid comprising the steps of: (a) slurrying crude aromatic dicarboxylic acid solids with water recycled from at least a filtration step in a feed preparation zone; (b) supplying flash steam in vapour phase to the feed preparation zone from at least one of a crystallisation step, a filtration step, and a drier step; (c) preheating the slurried aromatic dicarboxylic acid solids to form a solution; (d) subjecting the heated solution to hydrogenation; (e) pure aromatic dicarboxylic acid to crystallise; (f) filtering out the crystals of pure aromatic dicarboxylic acid and recovering water in a single stage filtration process; (g) supplying at least part of the recovered water to the feed preparation zone; and (h) drying the filtered crystals and recovering same, wherein the flash stream recovered from at least one of a crystallisation step, a filtration step or a drier step is recovered as a vapour phase stream having a pressure of from about atmospheric to 5 barg and is supplied to the feed preparation zone without phase change. Also described is a system for the purification of aromatic dicarboxylic acid and a feed preparation vessel therefor.

Inventors:

GRAY JULIAN STUART (GB)
WINTER MICHAEL WILLIAM (GB)

Application Number:

PCT/GB2011/051790

Publication Date:

May 10, 2012

Filing Date:

September 22, 2011

Export Citation:

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Assignee:

DAVY PROCESS TECHN LTD (GB)
GRAY JULIAN STUART (GB)
WINTER MICHAEL WILLIAM (GB)

International Classes:

C07C51/43; B01D9/00; C07C51/487

Domestic Patent References:

WO1993024441A1	1993-12-09
WO1994019082A1	1994-09-01