发明名称 |
PROCESS AND SYSTEM FOR PURIFICATION OF AROMATIC DICARBOXYLIC ACID AND FEED PREPARATION VESSEL USED THEREIN |
摘要 |
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. |
申请公布号 |
EA024634(B1) |
申请公布日期 |
2016.10.31 |
申请号 |
EA20130000184 |
申请日期 |
2011.09.22 |
申请人 |
DAVY PROCESS TECHNOLOGY LIMITED |
发明人 |
GRAY Julian, Stuart;WINTER Michael, William |
分类号 |
C07C51/43;B01D9/00;C07C51/487 |
主分类号 |
C07C51/43 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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