发明名称 |
VERFAHREN ZUR HERSTELLUNG HOCHREINER TEREPHTHALSÄURE |
摘要 |
In the process for producing a high-purity terephthalic acid of the invention, a slurry of crude terephthalic acid crystals dispersed in an acetic acid solvent, which is produced by a liquid-phase oxidation of p-alkylbenzene in the acetic acid solvent, is continuously converted into a slurry in water by a mother liquor displacement and then subjected to a catalytic hydrogenation. The acetic acid solvent slurry is introduced into a column equipped with a central shaft having a plurality of stirring blades along a vertical direction thereof from an upper portion of the column. The crude terephthalic acid crystals are allowed to sediment to form a high-concentration zone of terephthalic acid crystals in the column. A displacing water is fed into the column from a bottom portion thereof so as to form an upward flow of water in the column while forming circular flows in the high-concentration zone by rotation of the stirring blades, thereby bringing the terephthalic acid crystals into counter-current contact with the upward flow of water. The terephthalic acid crystals after counter-current contact with the upward flow of water is discharged from a bottom portion of the column together with the displacing water, while simultaneously taking the acetic acid solvent out of a portion of the column disposed above a feed portion for introducing the acetic acid solvent slurry. By the process, the acetic acid solvent of the acetic acid slurry is displaced by water in a high degree of mother liquor displacement. |
申请公布号 |
DE602004019121(D1) |
申请公布日期 |
2009.03.05 |
申请号 |
DE20046019121T |
申请日期 |
2004.09.30 |
申请人 |
MITSUBISHI GAS CHEMICAL CO. INC.;TOYO BOSEKI K.K.;MIZUSHIMA AROMA CO. LTD. |
发明人 |
FUJITA, HIDEAKI;MACHIDA, HIROSHI;NAMIKI, NOBUO;WAGURI, YOSHIO |
分类号 |
C07C51/47;B01D12/00;C07C51/265;C07C51/487;C07C63/26 |
主分类号 |
C07C51/47 |
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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