【3D Process Flow】Summary Post -- Full Process of Adiponitrile (ADN) Production via Phosgene Method

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【3D Process Flow】Summary Post – Useful for understanding the process flow: https://bbs.hcbbs.com/thread-5711616-1-1.html ---------------------------------------------------------- Understand the entire production process of nylon 66’s key raw material, adiponitrile (ADN), in just one diagram. Adiponitrile (ADN) is an aliphatic dinitrile, and the most common industrial production method for it is the hydrocyanation of butadiene. This process is mature and offers high yields; however, due to the use of the highly toxic raw material hydrogen cyanide (HCN), its key to successful operation lies in strict closed-loop control over reaction temperature, catalyst efficiency, handling of toxic gases, and the recycling of large amounts of solvent. 1: Raw material preparation and pre-treatment Before entering the core reaction system, the three key materials need to be in place: The raw material IPDA (isophorone diamine, V-101): This constitutes the backbone of IPDI. Chlorobenzene solvent (V-102): This solvent is essential in the phosgene process; it is used to dilute IPDA in order to control the reaction heat, and it is recycled as an absorbent. Raw material: Phosgene (COCl₂, V-103): A key reactant, but highly toxic. These raw materials first flow into the static mixer (M-101). Static mixers have no moving parts; they utilize a special internal structure to mix fluids rapidly and thoroughly, thereby preparing them thermodynamically and dynamically for the subsequent reaction. II: The Duo of Two-Stage Cyanation Reactions (A, B & C) This is the core part of the entire apparatus, comprising the \"primary\" cyanation reaction and the reaction for the formation of adiponitrile. Stage A: Primary cyanation reaction zone (99.9% colorless to slightly yellow adiponitrile product, which is then stored in the adiponitrile (ADN) product storage tank (V-104)). This product is a high-quality raw material for nylon 66.