METHOD FOR REFINING CRYSTALLINE AMINOPHENOLS
PROBLEM TO BE SOLVED: To provide a method for refining crystalline aminophenols having excellent effect from a respect scarcely causing discoloring with time even when stored in the air. SOLUTION: The method for refining the crystalline aminophenols comprises a step for drying crystal at ≤40°C until...
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| Main Author | |
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| Format | Patent |
| Language | English |
| Published |
28.07.2005
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| Edition | 7 |
| Subjects | |
| Online Access | Get full text |
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| Abstract | PROBLEM TO BE SOLVED: To provide a method for refining crystalline aminophenols having excellent effect from a respect scarcely causing discoloring with time even when stored in the air. SOLUTION: The method for refining the crystalline aminophenols comprises a step for drying crystal at ≤40°C until operation under reduced pressure is finished after filtering crystal obtained by crystallizing aminophenols and washing the crystal. Aminophenols obtained from a method comprising the following steps A to C are used as the aminophenols. The step (A): a step for reacting dihydric phenol with ammonia. The step (B): a step for carrying out crystallization operation of aminophenols using ethers as a solvent. The step (C): a step for filtering crystal of aminophenols after the step (B). COPYRIGHT: (C)2005,JPO&NCIPI |
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| AbstractList | PROBLEM TO BE SOLVED: To provide a method for refining crystalline aminophenols having excellent effect from a respect scarcely causing discoloring with time even when stored in the air. SOLUTION: The method for refining the crystalline aminophenols comprises a step for drying crystal at ≤40°C until operation under reduced pressure is finished after filtering crystal obtained by crystallizing aminophenols and washing the crystal. Aminophenols obtained from a method comprising the following steps A to C are used as the aminophenols. The step (A): a step for reacting dihydric phenol with ammonia. The step (B): a step for carrying out crystallization operation of aminophenols using ethers as a solvent. The step (C): a step for filtering crystal of aminophenols after the step (B). COPYRIGHT: (C)2005,JPO&NCIPI |
| Author | MORIMURA NAOKI |
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| Snippet | PROBLEM TO BE SOLVED: To provide a method for refining crystalline aminophenols having excellent effect from a respect scarcely causing discoloring with time... |
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| Title | METHOD FOR REFINING CRYSTALLINE AMINOPHENOLS |
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