There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde.

吡啶碱的生产方法主要有两种：一是从煤焦油中提取；二是从氨和甲醛、乙醛的合成过程中获得。

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There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde.

吡啶碱的生产方法主要有两种：一是从煤焦油中提取；二是从氨和甲醛、乙醛的合成过程中获得。

youdao