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Agglomeration Behaviour of Caprolactam Solution Concentrates Triggered by Cyclic Dimers in the Recovery Process: Characterisation, Mechanism, and Process Optimisation
Process Safety and Environmental Protection ( IF 4.384 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.psep.2020.01.026
Chunwang Yi; Ce Yang; Jie Li; Juan Chen; Shen Zhang; Huan Sun

The cyclic dimer 1,8-diazacyclotetradecane-2,9-dione is one of the most important components of caprolactam solution concentrates and triggers significant agglomeration during the recovery process in industrial polyamide-6 plants. For this reason, the agglomeration behaviour and morphology changes of cyclic dimers in solution concentrates were investigated. Precipitates separated from an ∼80 wt.% solution concentrate were explored. Cyclic dimers aggregated in the solution concentrates at lower temperatures to form larger, thicker, and compacted structures or multi-layers structures. An appropriate increase in the solution temperature and addition of fresh caprolactam aid in avoiding agglomeration, but high temperatures (over 140 ℃) initiate the hydrolytic polymerisation of caprolactam in the solution concentrate, which aggravates blockages. Based on these results, an optimised process model is introduced to avoid aggregation.
更新日期:2020-01-23

 

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