| 摘要 |
A sulfonation process includes the process steps of air sulfonating a fatty acid alkyl ester feedstock, bleaching the crude product with co- addition of up to about 40 wt.% of an alcohol based upon the weight of the crude product. The bleaching/alcohol addition step of the process is performed in a non-metallic or low-iron alloy system at temperatures above 90.degree.C. The resulting product is then neutralized with a liquid base or metal carbonate.
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