Pipe coil cooker

Apparatus for cooking sugar comprising a tubular coil wound about a longitudinal axis which is substantially vertically disposed, said coil including an inlet at the lower portion thereof and an outlet at the upper portion thereof, means in communication with said inlet for forcing a mixture of sugar, water and additives upwardly through said coil, a heating jacket disposed in surrounding relationship to said coil, means in communication with said heating jacket for providing a heating medium within said jacket to heat the mixture passing through said coil to a high temperature at which sugar crystals dissolve so as to provide a clear sugar solution at said outlet, and means in communication with said outlet for controlling the operational pressure within said coil, said coil being of rounded-off rectangular cross-section to ensure optimum heat transfer by improving the heat transfer per unit weight of the mixture of sugar, water and additives forced through the coil.