Regarding solvent extraction, the issue of solvents and water azeotropes! I seek advice from experts.
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Currently, all the large state-owned enterprises in the market for lubricant base oils no longer produce base oils of type 1. There are still some solvent extraction units in operation in the market; could someone please tell me whether NMP is azeotropic with water and what the temperature of the azeotrope is? What is the proportion of the azeotropic system as well?
The normal boiling point of NMP is 204°C. No reports of an azeotrope existing in the NMP/water system can be found in sources such as the \"Azeotrope Data Handbook,\" so it is estimated that no azeotrope will form. This is also supported by actual cases in industry where the vacuum distillation dehydration process is used to recover NMP from aqueous NMP waste solvents.