Separation and Purification Technology of 2,3-dimethylpyridine
The separation and purification process of 2,3-dimethylpyridine,a by-product of pyridine synthesized by the aldehyde-ammonia method,was studied by acidification,salt-formation,parsing,extraction and distillation.The separation and purification of 2,3-dimethylpyridine were carried out by investigating the type of hydrochloric acid,the ratio of hydrochloric acid to the reactant,the reflux time of the salt-forming reaction,the salt-forming crystallization temperature,the crystallization time,adjusting pH,the usage amount of the extraction agent and different distillation conditions.After detailed research,the separation and purification process of 2,3-dimethylpyridine with high content and high yield was determined.This process has the advantages of being green and environmentally friendly,having a simple method,high product purity and yield,low production cost,and a low amount of three wastes,and is suitable for large-scale production equipment.
2,3-dimethyl pyridinepurificationacidification of saltparsingextractiondistillation
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