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A cold trap is an apparatus for efficiently capturing hazardous vapors

The model UT series efficiently captures hazardous vapors by utilizing temperature differentials. When using vacuum ovens or centrifugal evaporators, a cold trap is required. It effectively traps water vapor and toxic fumes emitted from vacuum drying or concentration equipment within the vacuum system. This not only significantly extends the service life of exhaust systems but also ensures compliance with emission and drainage regulations.　

Main Applications

  • Small-scale cooling bath for low-temperature reactions.
  • Recovery of vapors from vacuum oven exhaust gases.
  • Solvent recovery from vacuum desiccators.
  • Protection of exhaust systems and vacuum pumps.

Benefits of Cold Trap Units

  • Efficiently captures exhausted water vapor and hazardous fumes.
  • Protects the researcher’s work environment and reduces exhaust gas emissions.
  • Extends the service life of vacuum pumps.
  • Maintains high vacuum levels.

Note: The larger the temperature difference between the solvent’s boiling point under pressure and the collection unit, the more effectively vapors can be condensed and captured, thereby increasing recovery efficiency.

Configuration and Installation of Aluminum Block Sets for Cold Traps

Trappable solvents under high vacuum conditions

Substance nameLow-boiling point substances
at 798Pa (6mmHg)at 133Pa (1mmHg)
When using a diaphragm vacuum pumpWhen using an oil rotary vacuum pump
UT-1000
UT-3010L		UT-4000A
UT-4000L		UT-2000UT-1000
UT-3010L		UT-4000A
UT-4000L		UT-2000
Ultimate temperature-50°C-80°C-100°C-50°C-80°C-100°C
Water—YesYesYesYesYesYes
IsopentaneYes—YesYes——Yes
NeopentaneYes——Yes———
PentaneYes——Yes——Yes
HexaneYesYesYesYes—YesYes
HeptaneYesYesYesYes—YesYes
Ethyl acetateYesYesYesYes—YesYes
MethylamineYes——Yes———
EthylamineYes—YesYes——Yes
AcetonitrileYesYesYesYes—YesYes
Methyl mercaptanYes——Yes———
Ethyl mercaptanYes——Yes——Yes
ChloroformYes—YesYes—YesYes
Methyl chlorideYes——Yes———
1,1-DichloroethaneYes—YesYes—YesYes
1,2-DichloroethaneYesYesYesYes—YesYes
DichlorofluoromethaneYes——Yes———
MethanolYes—YesYes—YesYes
EthanolYes—YesYes—YesYes
PropanolYes—YesYes—YesYes
IsopropanolYes—YesYes—YesYes
ButanolYes—YesYes—YesYes
Ethylene oxideYes——Yes———
Diethyl etherYesYesYesYes—YesYes
AcetaldehydeYes——Yes———
AcetoneYes—YesYes—YesYes
Methyl ethyl ketoneYesYesYesYes—YesYes
BenzeneYesYesYesYes—YesYes
1,3-ButadieneYes——Yes———
CyclopentaneYes—YesYes——Yes
CyclohexaneYesYesYesYes—YesYes
Octane—YesYesYesYesYesYes
Toluene—YesYesYesYesYesYes
Ethylbenzene—YesYesYesYesYesYes
o-Xylene—YesYesYesYesYesYes
m-Xylene—YesYesYesYesYesYes
p-Xylene—YesYesYesYesYesYes
Acetic acid—YesYesYesYesYesYes
Aniline—YesYesYesYesYesYes
Pyridine—YesYesYesYesYesYes
Chlorobenzene—YesYesYesYesYesYes

Note: These values are theoretical guidelines. Depending on the actual ambient environment and load, the trap temperature may rise, potentially preventing successful collection.
Note: Set the trap temperature based on a guideline of at least a 10°C difference from the solvent’s boiling point under the specific reduced pressure.

Risks associated with operating without a cold trap

Vacuum pumpDiaphragm vacuum pumpOil rotary vacuum pump
SampleAqueous samplesOrganic solventsAcidsAqueous samplesOrganic solventsAcids
Released into the atmosphere, affecting operators—YesYes—YesYes
Released into the atmosphere, affecting the work environment—YesYes———
Internal corrosion of the pump———Yes—Yes
Peeling of the pump’s paint—YesYesYesYes
Corrosion of surrounding areas——Yes——Yes
Accelerated degradation of pump oil———YesYesYes
Failure to reach high vacuum levelsYesYesYesYesYesYes
Slow concentration speedYesYesYesYesYesYes

Compatibility with combined equipment

Cold trapModelUT-1000UT-2000UT-3010LUT-4000AUT-4000L
Ultimate temperature-50°C-100°C-50°C-80°C-80°C
Dehumidifying volume (Water)0.5kg0.4kg4.0kg1.0kg4.0kg
Vacuum drying ovenVOS-210CYesYes—Yes—
VOS-310C——Yes—Yes
VOS-452SD——Yes—Yes
VOS-602SD——Yes—Yes
Centrifugal evaporatorCVE-2100YesYes—Yes—
CVE-2200YesYes———
CVE-3000YesYes—Yes—
CVE-3110YesYes—Yes—

A List of Cold Traps and their Primary Features (Combination options)

ModelCharacteristics of trapped solventsUltimate temperatureDehumidifying volumeConnection port diameterCombination options
UT-1000Acids and organic solvents-50°C500mL10mmGlass condenser set B
Low-boiling acids and organic solventsGlass condenser set B for low boiling point solvents
Aqueous solution0.5kgCover B with nozzle
Acids and organic solventsAluminum block set
UT-2000Acids and organic solvents-100°C500mL10mmGlass condenser set B
Low-boiling acids and organic solventsGlass condenser set B for low boiling point solvents
Aqueous solution0.4kgCover B with nozzle
Acids and organic solvents500mLAluminum block set
UT-3010LAcids and organic solvents-50°C1800mL13mmLarge-volume glass condenser set C
Aqueous solution4kg21.7mmTransparent cover with nozzle (made of acryl)
Cover with nozzle (SUS)
UT-4000AAcids and organic solvents-80°C500mL10mmGlass condenser set C
Low-boiling acids and organic solventsGlass condenser set C for low boiling point solvents
Aqueous solution1kg17.3mmTransparent cover with nozzle (made of acryl)
Cover with nozzle (SUS)
UT-4000LAcids and organic solvents-80°C1800mL13mmLarge-volume glass condenser set C
Aqueous solution4kg21.7mmTransparent cover with nozzle (made of acryl)
Cover with nozzle (SUS)

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