Accurate temperature control of chemical reactors is important for the chemical process as well as for safety reasons (on exothermic reactions especially).There are two ways of accurate temperature control of chemical pressure reactors:
Jacketed & el. heated reactors
Electrical heating for pressure reactors
In case of electrical heating, heating elements are integrated in the temperature control block (high temperature / high pressure reactor) or on other Buchi pressure systems on the reactor itself. Integrated cooling coils can be connected to water or compressed air. The Buchi btc PID temperature controller ensures accurate process temperatures and efficient heating. This temperature control system is used on Lab - and Pilot scale pressure reactors made of stainless-steel, Hastelloy® and other metals. It is also available in (ATEX) Ex version.
The typical temperature range is from room temperature up to 500°C.
Temperature control units (TCU) used with jacketed reactors
TCUs are used for accurate temperature control in combination with jacketed reactors. By circulating a heat transfer oil through the reactors jacket, efficient heating and cooling of the process media as well as stable process temperature is achieved. Temperature control with TCUs is used for chemical reactors made of glass, glass lined steel, but also made of stainless steel, Hastelloy and other metals.
TCUs installed outside of the Ex zone, connected to reactors inside Ex Zone 1 or 2, require an additional Buchi isolation barrier. For large TCUs, see also glass equipment, auxiliary equipment.
Chemical reactors can be operated by TUCs with heat transfer oils of different temperature ranges from -80°C up to 300°C - info on request. Typical operation temperature: -50 °C to +250 °C