This detailed process flow diagram (PFD) illustrates the ammonia-soda (Solvay) process, a major industrial method for the production of soda ash (sodium carbonate). The template details the flow of chemicals and reactions starting from inputs like limestone and coke, leading to the end product, soda ash. Key steps such as the carbonation tower, cooling tower, and calciner are marked, along with the flow paths for CO2, NH3 (ammonia), and H2O (water). This PFD is a tool for chemical engineers and plant operators to visualize and optimize the production process.