An efficient and energy-saving separation method for 1,4-cyclohexanediethanol (CHDM)

Through the optimized design of the three-tower distillation system with embedded thermal integration, the problems of high energy consumption, low purity and high investment cost in the separation process of 1,4-cyclohexanediethanol have been solved, realizing efficient and energy-saving CHDM separation, which is suitable for the preparation of raw materials for high value-added chemical products such as polyester fibers and coatings.

CN122079745APending Publication Date: 2026-05-26XUCHANG JINMENG POLYMATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XUCHANG JINMENG POLYMATERIAL TECHNOLOGY CO LTD
Filing Date
2025-12-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The separation process of 1,4-cyclohexanediethanol (CHDM) in the existing technology has problems such as high energy consumption, low product purity, severe thermal degradation and high investment cost. Especially when separating heavy components, the thermal efficiency of the atmospheric pressure series distillation column is low, coking of the column bottom is frequent, and high negative pressure operation leads to increased land occupation and investment.

Method used

The system employs a three-tower distillation system with embedded thermal integration and positive and negative pressure coupling. It combines atmospheric and vacuum distillation, low-temperature differential heat coupling, ordinary heat exchangers, forced circulation heat exchangers, falling film evaporators, and tower combinations. Through the optimized design and thermal coupling of the methanol separation tower, the heavy removal tower, and the product distillation tower, energy consumption is reduced and product purity is improved.

Benefits of technology

It significantly reduces energy consumption, improves product purity, reduces investment and operating costs, solves the problems of high-temperature coking and thermal degradation of heavy components, and is suitable for the preparation of raw materials for high value-added chemical products.

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Abstract

This invention discloses a highly efficient and energy-saving separation method and system for 1,4-cyclohexanediethanol (CHDM). It is a three-tower distillation system with embedded thermal integration and positive / negative pressure coupling. The product distillation tower is thermally coupled to the methanol tower, and the de-weighing tower is thermally coupled to the product distillation tower. The de-weighing tower is coupled to the product distillation tower, meaning the top vapor phase from the de-weighing tower directly enters a suitable position in the product distillation tower, and a suitable amount of liquid is extracted at an appropriate position as reflux from the de-weighing tower. This significantly saves energy and reduces investment costs without affecting separation. The bottom temperature of the de-weighing tower can operate stably below 240°C for extended periods, reducing the risk of high-temperature polymerization and dehydration. A heat exchanger is embedded at a suitable position in the methanol tower stripping section to heat the methanol tower with the top vapor phase from the product distillation tower, further reducing energy consumption.
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Citation Information

Patent Citations

  • A continuous preparing method and apparatus for cyclohexanedimethanol

    CN106518608A