S-ANT Acrylonitrile Simplified Process Flow Diagram | Adapted from Shandong Synergy Tech (Ref. Nr. 11)

S-ANT is the trademarked designation of the complete acrylonitrile technology with independent intellectual property rights developed by Sinopec Shanghai Research Institute of Petrochemical Technology (SRIPT), a subsidiary of China Petroleum & Chemical Corporation (Sinopec), and offered for licensing by SRIPT/Sinopec as an integrated package — process package, matching SANC-series catalyst, reactor design, separation technology and environmental-protection technology — at scales up to a 400 kt/a single train, the world's largest, started up at Sinopec Zhenhai Refining & Chemical on 12 August 2025. The technology produces acrylonitrile by fluidized-bed ammoxidation of propylene over silica-supported SANC catalysts. Its patent base (230⁺ granted acrylonitrile patents) is anchored by CN1056601C — fluidized-bed dilute-phase internals that raise ammonia conversion from ~93% to 97–99% by promoting the secondary NH₃/acrolein/propylene reaction, underpinning the "clean-process" concept that minimises ammonium-sulfate waste — and by the internationally filed companion family (WO1998055217A1, US6716405B1). 

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