1、 Working principle: Four major systems collaborate to control temperature

　　Reactor high and low temperature integrated machineAccurate temperature control is achieved through four major systems: refrigeration, heating, circulation, and temperature control. The core logic is as follows:

refrigeration system

Adopting steam compression refrigeration, the core components include compressor, condenser, expansion valve, and evaporator.

The refrigerant (such as R410A) is compressed by a compressor into a high-temperature and high-pressure gas, which is then cooled by a condenser and becomes liquid. It is then throttled and depressurized by an expansion valve into a low-temperature and low-pressure gas-liquid mixture, which enters the evaporator to absorb the heat of the refrigerant and complete the refrigeration cycle.

The low temperature range can reach -80 ℃ (some models), meeting the requirements of deep low temperature experiments.

heating system

Adopting electric heating method, the core component is stainless steel heating tube or ceramic heating plate, directly immersed in the refrigerant.

When the temperature is lower than the set value, the heating tube is energized to convert electrical energy into thermal energy, and the refrigerant is uniformly heated by the circulation pump, with a high temperature range of up to 250 ℃ (some models).

circulatory system

Powered by a circulating pump, the refrigerant is circulated between the equipment and the reactor jacket through a closed pipeline.

The refrigerant exchanges heat with the materials inside the jacket and the kettle. After completing the heat exchange, it flows back to the equipment, forming a closed-loop cycle to ensure temperature stability.

Temperature Control System

Composed of a temperature sensor, PLC controller, and touch screen display, it collects the temperature of the refrigerant in real time and transmits it to the PLC.

By using the PID algorithm to "pulse" regulate the heating/cooling components, the temperature fluctuation is controlled at ≤± 0.2 ℃, and the touch screen supports parameter setting and data storage.

2、 Application scenario: Covering multiple domain requirements

　　Reactor high and low temperature integrated machineWith a wide temperature range (-80 ℃ to 300 ℃) and high-precision temperature control capability, it is widely used in the following fields:

Chemical reaction temperature control

Control the reaction temperature and stabilize chemical reactions under high pressure (such as hydrogenation reactions).

Collect reaction products through low-temperature cooling to ensure the controllability of the reaction process.

material synthesis

Synthesize materials with different properties (such as alumina powder and thermoplastic resin) by combining high and low temperature processes.

Suitable for semiconductor equipment cooling and heating, vacuum chamber cooling and heating, and other scenarios.

Microbiological research

Used for fermentation, ion exchange, colloid preparation and other experiments to improve the efficiency of microbial product synthesis.

Drug development

Quickly control temperature and ensure stability, meet the precise control requirements of drug reaction processes, and accelerate the research and development process.

Fine chemical production

High precision temperature control technology ensures product quality and improves production efficiency, such as in the synthesis of silicone resin.

3、 Selection Guide: Precise Matching of Four Dimensions

When selecting, it is necessary to consider the reactor specifications, experimental temperature range, core performance, and practical details to avoid blindly pursuing high performance.

Match the specifications of the reaction kettle

30 liter double-layer reactor: Choose models with cooling capacity of 1.5-2.5KW.

Reactors with a capacity of over 50 liters: Choose models with a cooling capacity of over 3KW to ensure temperature control efficiency.

Determine the experimental temperature range

Conventional synthesis: Select models with temperatures ranging from -40 ℃ to 200 ℃.

Deep low temperature experiment: Choose a -80 ℃ model to avoid functional redundancy.

Evaluate core performance

Temperature control accuracy: Priority should be given to models with temperature fluctuations of ≤± 0.5 ℃, with dual screen display for real-time comparison between the set and actual temperatures.

Heating and cooling speed: Conventional experiments choose models with a heating rate of 3-5 ℃/min and a cooling rate of 2-4 ℃/min; Choose higher speed models for special quick response.

Circulating system: Choose corrosion-resistant materials (such as 304 stainless steel) for the circulating pump, compatible with various media such as water and thermal oil.

Pay attention to practical details

Convenience of operation: Touch buttons are easier to operate than knobs, and support timed functions to reduce manual supervision.

Safety protection: It must have over temperature alarm and leakage protection functions, and some models are equipped with overload protection.

Mobile and maintenance: Models with brake universal wheels are easy to move; Models with liquid level observation windows on the body are more convenient for supplementing thermal conductive media.

Cost and long-term benefits

Initial price: Avoid only looking at the price and calculate long-term costs (such as energy consumption and replacement costs of vulnerable parts).

Energy consumption: Choosing low-energy models can save electricity bills every month.

Vulnerable parts: Choose models with easily replaceable sealing rings to reduce maintenance costs.

4、 Misconceptions and Solutions in Selection

Misconception 1: 316L stainless steel "universal anti-corrosion"

Problem: 316L stainless steel is not resistant to strong corrosive media such as hydrofluoric acid and concentrated sulfuric acid.

Solution: Choose Hastelloy C276 or PTFE lined reactor for strong acid environment.

Misconception 2: Glass reaction kettle is "safe and non-toxic"

Problem: Glass reaction vessels are not resistant to high pressure and are easily corroded by strong alkalis (such as NaOH solution).

Solution: Choose stainless steel or Hastelloy reaction vessels for high-pressure or strong alkaline environments.

Misconception 3: Ignoring the Influence of Environmental Temperature

Problem: The cooling efficiency of air-cooled equipment may decrease by 50% in environments above 35 ℃.

Solution: Choose water-cooled equipment or reserve heat dissipation space for high-temperature environments.

Misconception 4: Underestimating the corrosiveness of the medium

Problem: Failure to provide MSDS of materials to the supplier resulted in incorrect material selection.

Solution: Provide MSDS of materials before selection and select targeted materials.