Method for preparing vitamin B1 intermediate (pyrimidine)
The invention discloses a method for preparing a vitamin B1 intermediate (pyrimidine). The method comprises the following steps: directly carrying out water vapor distillation to recover o-chloroaniline, hydrolyzing, adding methanol, and properly controlling the aminopyrimidine concentration and the...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The invention discloses a method for preparing a vitamin B1 intermediate (pyrimidine). The method comprises the following steps: directly carrying out water vapor distillation to recover o-chloroaniline, hydrolyzing, adding methanol, and properly controlling the aminopyrimidine concentration and the methanol concentration to obtain the intermediate thiothiamine used in a next process. The method has the advantages of simple process operation, high combined yield, environmental protection and energy saving. |
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