A stirred tank reactor is a type of vessel used in chemical processes to mix reactants and facilitate reactions. It typically features an impeller that stirs the contents, ensuring uniform distribution of temperature and concentration. This design allows for better control over reaction conditions, making it suitable for various applications in industries like pharmaceuticals and food processing. These reactors can operate under different conditions, such as varying temperatures and pressures, depending on the specific reaction requirements. The continuous mixing helps to enhance reaction rates and improve product yields, making stirred tank reactors a popular choice in both batch and continuous processes.