Ozonization method for preparing nicotinic acid
The invention discloses a preparing method of niacin through ozone, which comprises the following steps: adopting quinoline as raw material; reacting sulphuric acid and quinoline to protect pyridine ring; making ozone and hydrogen dioxide solution as oxidant in the glacial acetic acid or composite s...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The invention discloses a preparing method of niacin through ozone, which comprises the following steps: adopting quinoline as raw material; reacting sulphuric acid and quinoline to protect pyridine ring; making ozone and hydrogen dioxide solution as oxidant in the glacial acetic acid or composite solvent of glacial acetic acid and water; oxidizing to form 2, 3-pyridine dicarboxilic acid under normal pressure at 0-80 Deg C; subliming; adding little water to form even liquid phase; decarboxylating to obtain the product. |
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