Purification process of 2, 3-dimethylpyridine

• Main Authors: YANG YANHE, QIN YIZHONG
• Format: Patent
• Language: Chinese; English
• Published: 20.11.2020
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY

The invention relates to the technical field of polymethylpyridine production, in particular to a purification process of 2, 3-dimethylpyridine. The process mainly comprises the following steps: carrying out primary rectification and secondary rectification by adopting a byproduct high-boiling residue of a pyridine production process to obtain high-purity 2, 3-dimethyl pyridine. The problem that materials with similar boiling points are difficult to separate efficiently is effectively solved, the boiling points of components can be reduced through reduced-pressure rectification, energy consumption is reduced, the adopted corrugated net packing is large in specific surface area and gap, high in mass transfer efficiency and good in separation effect, the concentration of the 2, 3-dimethylpyridine can be increased to 99.5 +/-0.1 wt% through two times of rectification, the yield reaches 80%, a distillation method and a full-closed production process are completely utilized in the whole purification process, and t