Production methods: pyridine and picoline ago from coal tar by-product of the recovery, it is distributed in the coke oven gas, tar and crude benzene. General gas transfer from the mother liquor in the ammonium sulfate hydrate the boiling point of pyridine is very low, at between 95-97 ℃, the recovery of light crude base in pyridine, 2 - methyl-pyridine with 15%, and further distillation can be made to cut 2 - methyl-pyridine. With the use of pyridine and picoline expansion, synthetic production of pyridine and picoline continue to develop.