Any hydrocarbon present in the H2S gas has the same effect on the system as hydrocarbon in the spent acid feed stream.

H2S气体中的任何碳氢化合物与废酸原料流中的碳氢化合物一样，对该体系的作用是相同的。

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Propionic acid and its salts are important feed preservatives.

丙酸及其盐是重要的饲料防腐剂。

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The effects of catalyst quantity, acetic alcohol mole ratio, acetic acid and ethyl alcohol feed site, reflux ratio and reflux composition on the process are investigated.

对乙酸与乙醇酯化反应体系，考察了催化剂用量、酸醇比、进料位置、回流比、回流组成等因素对过程的影响。

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Until recently, they have had to feed their bacteria with the unnatural amino acid in question, but in one case they have managed to overcome even that constraint.

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