a process was developed to refine tallow with alkali and sulfuric acid.

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a process was developed to refine tallow with alkali and sulfuric acid.
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a process was developed to refine tallow with alkali and sulfuric acid.
a process was developed to refine tallow with alkali and sulfuric acid.

a process was developed to refine tallow with alkali and sulfuric acid.
开发出了一道从牛油中提炼碱和硫酸的工序.