Jet ejector is one of the devices for gas liquid contacting, which utilizes a liquid media to absorb objectionable gases and particulates from industrial gaseous effluents. Ejector type scrubbers utilize a high velocity fluid jet for bringing the liquid and gas into intimate contact with each other. To design jet ejector (single or multi nozzle), for efficient absorption of gaseous species with simultaneous chemical reaction of species present in liquid mathematical models are required. Rigorous literature review of gas-liquid contactors suggests that mass transfer with chemical reaction in jet ejector is nearly unexposed. The current research work on mass transfer with chemical reaction between two phases (gas and liquid), using single and multi nozzle jet ejector or as a Gas liquid Contactor is presented in the book emphasizing on the following 1. Most recent literature survey in the area of mass transfer characteristics for designing jet ejector 2.The experimental study of rate of absorption with chemical reaction in single/multi nozzle jet ejector (laboratory scale and industrial scale) using chlorine-aqueous sodium hydroxide system.