Benzene carbonic acid purifying method
This invention is a kind of benzoic acid purification method, utilize amidocyanogen substance that boiling point higher than benzoic acid, after heat treatment of the benzoic acid intermediate product gained in the oxidation course which make the phthalic anhydride with raw materials of 1,2-xylene,r...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | This invention is a kind of benzoic acid purification method, utilize amidocyanogen substance that boiling point higher than benzoic acid, after heat treatment of the benzoic acid intermediate product gained in the oxidation course which make the phthalic anhydride with raw materials of 1,2-xylene,repassing distillation treatment, getting high purity benzoic acid. |
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