A method for separating and purifying 1,2-cyclohexanediamine from a product synthesized from hexamethylenediamine by hydrogenation of adiponitrile
Through the combined process of delight tower and purification tower, using high vacuum distillation technology, 1,2-cyclohexanediamine was successfully isolated and purified from the product of hydrogenated adipiconet into hexanediamine, solving the problems of low purity and yield in the prior art, and achieving efficient product purification.
CN116986995BActive Publication Date: 2025-08-29SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD +1
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Patent Information
- Application Number
- CN202310925732.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-26
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2043-07-26
AI Technical Summary
Technical Problem
The prior art is difficult to effectively isolate and purify 1,2-cyclohexanediamine in the product in the process of hydrogenation of adiponitrile, resulting in low product purity and utilization value.
Method used
The combination process of delighting tower and refined tower is adopted to separate and purify 1,2-cyclohexanediamine by limiting the theoretical number of plates, operating pressure and temperature, and distillation is carried out under high vacuum conditions.
Benefits of technology
The separation and purification of 1,2-cyclohexanediamine with high purity and high yield is achieved, and the product quality and production efficiency are improved.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a method for separating and purifying 1,2-cyclohexanediamine from a product synthesized from hexamethylenediamine by hydrogenating adiponitrile. The method comprises the steps of firstly rectifying the product synthesized from hexamethylenediamine by hydrogenating adiponitrile in a lightness removal tower, collecting the obtained bottom liquid, sending it to a refining tower for further rectification, and extracting 1,2-cyclohexanediamine from the top of the refining tower. The method successfully separates and purifies 1,2-cyclohexanediamine from a product synthesized from adiponitrile with complex components and similar physical properties by limiting the theoretical plate number, tower top operating pressure, and tower bottom operating temperature of the lightness removal tower and the theoretical plate number, tower top operating pressure, and tower top operating temperature of the refining tower, thereby effectively improving the product quality and production efficiency of 1,2-cyclohexanediamine.
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