发明名称 |
VERFAHREN ZUR HERSTELLUNG VON GEREINIGTER TEREPHTHALSÄURE. |
摘要 |
In a process for producing purified terephthalic acid which comprises catalytically oxidizing p-xylene in liquid phase to produce crude terephthalic acid containing 4-carboxybenzaldehyde as a main impurity therein, and treating the crude terephthalic acid with hydrogen in the presence of a hydrogenation catalyst in a reaction vessel, thereby to produce purified terephthalic acid containing 4-carboxybenzaldehyde in an amount of fixed range in a stationary manner, there is provided an improvement which makes it possible for the treatment to reach the stationary state promtly after partial exchange of deactivated catalyst for a new one. The improvement comprises feeding into the reactor crude terephthalic acid which contains 4-carboxybenzaldehyde in an amount larger than that in the stationary state of the treatment, and treating the terephthalic acid until the treatment reaches the stationary state. |
申请公布号 |
AT129489(T) |
申请公布日期 |
1995.11.15 |
申请号 |
AT19910111118T |
申请日期 |
1991.07.04 |
申请人 |
MITSUI PETROCHEMICAL INDUSTRIES, LTD. |
发明人 |
TANIGUCHI, NORIO, C/O MITSUI PETROCHEM;WAKICHO;YAMANE, HIROSHI, C/O MITSUI PETROCHEM. |
分类号 |
B01J23/44;C07B61/00;C07C51/265;C07C51/42;C07C51/487;C07C63/26 |
主分类号 |
B01J23/44 |
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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