Process Simulation and Optimization of Adipic Acid Catalytic Ammoniation for Adiponitrile Production

Peng Jia; Song Xue; Yuhan Yan; Qi Zhang; Yanhong Huang; Pengzhi Bei; Zian Yan; Xu Feng; Yifan Zhang; Qianqian Xu

doi:10.54097/qbzc6h14

Authors

Peng Jia
Song Xue
Yuhan Yan
Qi Zhang
Yanhong Huang
Pengzhi Bei
Zian Yan
Xu Feng
Yifan Zhang
Qianqian Xu

DOI:

https://doi.org/10.54097/qbzc6h14

Keywords:

Adiponitrile; Adipic acid ammoniation; Sensitivity analysis; Process energy-saving optimization; Heat exchanger network optimization.

Abstract

Adiponitrile (ADN) is a critical raw material for nylon 66, and its efficient, green production is vital for securing the supply chain of key materials. Among domestic ADN production methods, the traditional butadiene hydrocyanation process faces challenges such as complex procedures, high energy consumption, and significant safety risks. In contrast, the adipic acid (AA) ammoniation method has garnered attention due to its simplified process, high product yield, and relatively low investment. However, industrial applications still encounter technical bottlenecks, including excessive energy consumption and insufficient heat integration. This study focuses on optimizing the AA ammoniation process for ADN production using Aspen Plus simulation, process intensification, and heat integration technologies. A comprehensive process model was developed, covering key units such as reactors and distillation columns. Sensitivity analysis was employed to investigate parameters like theoretical tray numbers, reflux ratios, and feed positions, revealing significant energy consumption in the cyclopentanone purification column (T0306). By introducing heat pump distillation technology, the latent heat of top vapors was recovered to drive the reboiler, reducing energy consumption by 85.9%. Additionally, the heat exchanger network was optimized by removing small-area exchangers and breaking loop circuits, achieving an 18.84% reduction in energy consumption. This research provides theoretical and technical support for the industrial development of green ADN production processes.

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