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Home > System > High Pressure Reactor > Special Purpose Reactor > Hydrothermal Reactor

High Pressure Reactor

Special Purpose Reactor - Hydrothermal Reactor [Overview]
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     Overview   HSR05   HSR1   HSR2   HSR PS  
 
Hydrothermal synthesis means the techniques crystallizing substances such as metal salt, oxide, hydrate, or metal powders which depend on solubility, temperature, pressure and solute concentration in solution or suspension. Liquid Phase Synthesis is synthesizing method in high temperature and pressure by using a water or aqueous solution. Mineralizer contributes the solubilization, accelerate nucleation of compound in liquid. Mineralizer not only just lowers the temperature but also generates compound selectively, so it is necessary for hydrothermal synthesis. Ilshin Autoclave's Hydrothermal Synthesis system can perform hydrothermal synthesis of various materials. Most of powders are crystallized in 300, 85 /. Our equipments provide accurate temperature and pressure for process. Ilshin Autoclave Co.,Ltd obtained ASME pressure vessels certification of design & manufacturing, also have Korea Gas Safety Corporation and The Korea Occupational Safety and Health Agency certification so can ensure safety.
 
 
Classification of Hydrothermal Synthesis
Classification Features
 Hydrothermal Crystallization Crystallize an amorphous substance or low crystalline in hot water.
 Hydrothermal Precipitation Precipitate alcohols or salt by hydrolysis or neutralization in hydrothermal condition
 Hydrothermal Reaction React solvent or solid in hydrothermal condition to generate new precipitation.
 Hydrothermal Decomposition Decompose compounds in hydrothermal condition.  
 Hydrothermal Oxidation Oxidize metals by an water solution in high pressure and temperature.
 
The advantages of hydrothermal synthesis
Fast reaction and dispersion (It’s suitable for generating solid solution / compounds)
Control pressure, temperature, solution, and addictives.
Weaknesses of usual liquid phase synthesis (ex: co-precipitation, hydrolysis method)
 
Weaknesses of usual liquid phase synthesis (ex: co-precipitation, hydrolysis method)
- Non-uniformity when removing residual solvent
- Inhomogeneous crystallization
- Cause pollution / agglomeration when performs sintering or pulverization  
 
Major materials using hydrothermal synthesis
* Hydrothermal Synthesis (BaTiO3)
1) Properties : High dielectric constant and thermostability → ferroelectricity, piezoelectricity
2) Applications : Capacitor, thermistor, sensor, communication filter, microwave filter, NVM(non-volatile memory),
                               DRAM(Dynamic Random Access Memory), heat detector, optical waveguide
3) Manufacturing process drawing of hydrothermal synthesis
4) An analysis on properties of materials
Synthesis Method Firing temp.(°C) SSA(m2/g) SSA D(μ) X-ray D(μ)
Hydrothermal - 8.5 0.12 0.09
400 8.2 0.12 -
600 7.2 0.14 -
800 6.0 0.16 -
Co-precipitation 900 5.5 0.18 0.12
1000 4.6 0.22 0.13
1050 3.3 0.30 0.29
Solid-state reaction 1100 1.0 1.00 0.49
 
* Hydrothermal Synthesis (ZnO)
 
1) Stirring speed : zinc chloride (Zncl2) / zinc acetate (Zn(Ac)2)
Starting material - Zinc chloride
    ZnCl2 + 2NaOH → Zn(OH)2 + 2NaCl → ZnO + H2O + 2NaCl
Starting material - Zinc acetate
    Zn(AC)2 + 2NaOH → Zn(OH)2 + 2NaAc→ ZnO + H2O + 2NaAc
- Reaction temperature : 80
- Process time : 6 hours
- Precipitant : 1M NaOH (dropping 10ml/min)
- Stirring speed : 2000rpm
2) Change of Zno according to Starting Material
Starting material : Zinc chloride Starting material : Zinc acetate
3) Change of Zno according to Mole Concentration
(A) 0.2 M   (B) 1 M    (C) 2 M
4) Change of Zno according to time

5) Change of Zno according to temperature
80 150
6) Change of Zno according to pH
 
Benefits of Ilshin Autoclave's Hydrothermal Synthesis Reactor
Safety
• Design and manufacture according to ASME(American Society of Mechanical Engineer), pressure vessel standards.
• Design and manufacture according to KGS and KOSHA.
Accurate equipment
• Improve process time and equipment efficiency by installation of heater
• Maintain constant temperature by internal/external insulation
• Improve safety through the multi-safety devices
Customized engineering

 • A variety of types and specification for customer
 • Different types of research are available by various additional components.

Easy assembly/disassembly and clean up
• A variety of measurements facilitate analyzing operating conditions.
• Easy assembly/disassembly and clean up
 
Products
Hydrothermal Synthesis Series
HSR05 series
HSR1 series
HSR2 series
HSR PS series
 
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