A synthesis reactor is a type of chemical reactor specifically designed to carry out synthesis reactions — processes where simpler substances combine to form more complex products. These reactors provide the controlled environment necessary for reactants to interact, typically under specific conditions of temperature, pressure, and catalyst presence. In chemical engineering and industrial applications, synthesis reactors are crucial in producing a wide range of chemicals, including ammonia (in the Haber-Bosch process), methanol, hydrocarbons, and pharmaceuticals. They often employ designs such as fixed-bed, fluidized-bed, slurry, or loop reactors to maximize efficiency and product yield.