A method and apparatus for refining p-dioxanone by distillation coupled with gas phase adsorption dehydration

By using a depressurized distillation coupled with gas-phase adsorption dehydration, distillation is carried out under full reflux conditions, and the adsorption tank and empty tank are switched. This solves the problems of low dehydration efficiency and impurity introduction in the purification process of dioxane in the prior art, and realizes a highly efficient and simplified purification process and the production of high-purity products.

CN122404281APending Publication Date: 2026-07-17CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies for refining dioxane have problems such as low dehydration efficiency, complex processes, and easy introduction of impurities, which affect product purity and production efficiency.

Method used

A decompression distillation coupled with gas-phase adsorption dehydration method is adopted. Distillation is carried out under total reflux conditions. Gas-phase adsorption dehydration is achieved by switching between adsorption tanks and empty tanks. The discharge operation is carried out by periodically analyzing the water content in the condensate at the top of the column, and trace water is adsorbed and removed simultaneously.

Benefits of technology

This technology enables the efficient production of high-purity, low-water-content p-dioxanone within the same equipment, simplifying the process, improving production efficiency, maintaining product yield, and reducing investment costs.

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Abstract

本发明公开了一种精馏耦合气相吸附脱水精制对二氧环己酮的方法和装置。所述方法包括：在全回流状态下，对PDO粗品进行减压精馏，精馏过程中控制精馏塔塔顶上升气体进行气相吸附脱水，待脱除大部分水后，保持一定回流比进行出料操作，即得到纯度99‑99.9％、含水5‑60ppm的对二氧环己酮产品。本发明能够高效率地在一个设备里得到高纯度、低水含量的对二氧环己酮产品，同时保持较高的产品收率，本发明的方法具有工艺流程简单、投资成本低的特点，具备良好的工业推广前景。
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Citation Information

Patent Citations

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