Pyridine, an organic compound, is a six-membered heterocyclic compound containing one nitrogen heteratom. It can be seen as a compound in which one of the benzene molecules (CH) is replaced by N, so it is also called nitrobenzene, colorless or slightly yellow liquid, and has a foul odor. Pyridine and its homologues are found in bone tar, coal tar, gas, shale oil, and petroleum. Pyridine is used industrially as a denaturant, dye aid, and raw material for the synthesis of a range of products, including pharmaceuticals, disinfectants, dyes, etc. Pyridine hydrochloride is the hydrochloride state of pyridine. Pyrichemicalbook hydrochloride can be used as organic synthesis intermediates and pharmaceutical intermediates, can be used as laboratory research and development process and chemical pharmaceutical production process, and is also one of the raw materials for the production of methylerythromycin. The preparation method can directly form salt by passing dry hydrochloric acid gas into pyridine. Specific method: The reaction bottle was filled with 100 grams of sodium chloride and 200 ml of concentrated hydrochloric acid, and then drip-added concentrated sulfuric acid to produce hydrochloric acid gas. After drying with concentrated sulfuric acid, it was passed into pure pyridine solution cooled by ice water bath to prepare pyridine hydrochloride. Use as a pharmaceutical intermediate

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