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| A Probe into Key Processing Steps in Sorbic Acid Production |
| WANG Guo-jun |
| Ningbo Wanglong Technology Shares Co. Ltd., Yuyao 315476, China |
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Abstract Several key processing steps in the industrial production of sorbic acid are described in this paper. Firstly, the quality
control of raw materials should be strictly ensured, especially for the preparation of high-quality ketene, which is necessary to
prepare high-quality polyesters with high conversion rate. Secondly, it is necessary to strictly specify the polymerization
process. Only high crotonaldehyde conversion rate makes it possible to obtain high sorbic acid yield, so crotonaldehyde
conversion rate is the base for sorbic acid production. Thirdly, high sorbic acid yield can be obtained only if high-quality
polyesters with high conversion rate are entirely depolymerized, thus indicating that depolymerizing polyesters is the foundation
for the production of sorbic acid. Finally, the crude product resulting from polyester depolymerization is made up of sorbic
acid and tar. High-quality sorbic acid can be obtained only if tar is be thoroughly separated from the crude product. This means
that tar removal is the key for the production of high-quality sorbic acid.
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2011, Vol. 25 
