Aqueous ammonia is an alternative solvent for CO2 capture that has many advantages. In recent years, researchers have investigated ammonia as a promising solvent for CO2 capture from various gases. A significant emitter of carbon dioxide from the chemical sector is the soda ash industry. Since ammonia is an auxiliary substrate in soda production, it can easily be used to capture CO2 from tail gas streams. After CO2 absorption, process liquids can be returned to the production process, helping to reduce the use of raw materials.The main source of CO2 emissions to the atmosphere in the Solvay Process is the post-carbonation gas from the carbonating tower. It has been demonstrated that this process can be intensified and the use of calcium carbonate in the form of limestone is reduced by returning the carbon dioxide to the process. Stoichiometrically, one kg of avoided CO2 saves approximately 2.27 kg of limestone. This paper presents the initial results and lessons learned from the operation of the pilot plant for CO2 capture from tail gas streams of the Solvay Process. The process has been tested and implemented in a pilot plant with a gas flow rate of up to 4000 m3n/h. The influence of various process parameters has been investigated.