Selection guide for laboratory temperature control equipment: precise temperature control, efficient experiments

Selection guide for laboratory temperature control equipment: precise temperature control, efficient experiments

Temperature control equipment is one of the core equipment in laboratories in fields such as chemical synthesis, materials research, and pharmaceuticals. Reasonable selection can not only improve experimental efficiency, but also ensure the stability of equipment and experimental safety. This article will start with four major equipment: "circulating water bath, heating and cooling circulator, recirculating chiller, and heating circulator", to explain in detail their principles, application scenarios, and selection points, helping you easily match reaction vessels, microchannels, or rotary evaporator to achieve precise temperature control!

1. Circulating water bath: an ideal choice for small and medium-sized low-temperature reactions

The circulating water bath, with its built-in refrigeration system and external circulation function, can provide a stable temperature environment within the range of -40℃ to 100℃, suitable for:

Constant temperature control of small reactor (1 ~ 5L), such as organic synthesis and crystallization experiments.

The low-temperature condensation of the rotary evaporator prevents the escape of volatile solvents.

Maintain the temperature of microchannel reactors to improve reaction uniformity.

Selection suggestion:

Temperature control accuracy: Below 0℃, the temperature control accuracy can reach ±0.1℃

Material: Stainless steel tank body is corrosion-resistant and suitable for organic solvent environments.

Circulating flow rate: When combined with microchannels or reaction vessels, a high flow rate (≥15L/min) should be selected to ensure heat exchange efficiency.

2. Heating and cooling circulator: flexible response to complex temperature field requirements

The heating and cooling circulator has both cooling and heating functions, with a commonly used range of -80℃ ~ 200℃ and a maximum of 350℃, suitable for the following scenarios:

Complex reaction process: such as temperature control throughout the entire process from low-temperature initiation to high-temperature post-treatment.

Dynamic temperature control experiment: programmed heating or cooling, suitable for catalytic testing and polymerization reactions.

Multiple devices in series: can provide independent temperature control for both the reactor and microchannel reactor simultaneously.

Selection suggestion:

Temperature control accuracy: The dynamic accuracy can reach ±0.5℃, and the static temperature control accuracy is ±0.1℃.

Heat transfer medium: Select heat transfer oil according to temperature to avoid the medium being unable to adapt to the extreme temperature.

Communication interface: Optional RS485 or Ethernet interface for easy integration with the automation system of the reactor.

3. Recirculating chiller: a low-cost solution for efficient heat dissipation

This device quickly removes heat by circulating low-temperature coolant (-120℃ ~ 0℃) and is suitable for the following scenarios:

To provide a stable cold source for the rotary evaporator and improve solvent recovery efficiency.

Assist in circulating cooling outside the reactor to reduce long-term operating costs.

Cooperate with high-precision constant temperature bath to achieve temperature control of large capacity reaction system.

Selection suggestion:

Cooling depth: For regular requirements, select models with a temperature of -40℃, while for special low-temperature experiments, models with a temperature below -80 ℃ are required. The temperature control accuracy can reach ± 0.5 ℃.

Corrosion resistant design: The material of the pump body needs to withstand cooling media such as ethylene glycol and saltwater.

Noise reduction performance: Compressor noise ≤ 65dB is suitable for open laboratories.

4. Sealed heating circulator: safely achieving high-temperature reactions

The sealed heating circulator can provide a stable high-temperature environment of 200℃~350℃ through the circulation of thermal oil, suitable for:

Catalytic reactions and synthesis of nanomaterials in high-temperature and high-pressure reactors.

High temperature experiments that require inert atmosphere protection (such as sintering of lithium battery materials).

Prevent oxidation of high-temperature media and improve the service life of equipment.

Selection suggestion:

Temperature control accuracy: within ±0.5℃, ensuring stability in sensitivity experiments.

Safety protection: equipped with over temperature alarm, pressure relief valve, and automatic power-off function.

Oil circuit sealing: The fully enclosed circulation system avoids contamination caused by thermal oil leakage.

Reasonable selection of temperature control equipment not only saves energy consumption, but also improves the success rate of experiments.