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Carbon Traps
 

Carbon traps offer a solution for the removal of undesirable gaseous and vapour contaminants in glove boxes. The unique physical absorptive properties of activated carbon make this an ideal, and economical, consumable product for the removal of solvents. Impregnated activated carbons function by the combined effect of chemical reaction and adsorption to remove contaminants that are not readily adsorbed by activated carbon alone.

Carbon traps can be installed in the outlet vents of gas purged (open loop) glove boxes, and in line prior to the gas purifier in gas recirculated (closed loop) glove boxes. Carbon traps should not be used in place of a particulate filter but in conjunction with one, as each has a dedicated design and operational function.

Gas purifiers are particularly vulnerable to being de-activated (poisoned) by sulphur and sulphur compounds, halides, chlorides, halogen, alcohols, hydrazine, phosphene, arsine, arsenate, mercury and other metallic compounds. Solvents have an adverse effect on the moisture reactant.

Carbon traps need to be carefully selected to the design parameters of the glove box gas flow velocity and volume for effective operation. Additionally, the carbon capacity needs to reflect the amount of contaminant and recharge time scale if saturation, and contaminant bypass, is to be avoided.

In practical terms it is difficult to predict the life or monitor the condition of a carbon filter in glove box applications. Activated carbon has a variable weight of absorbed contaminant to weight of carbon, with ratios of 1% up to 50% for differing chemicals. As a consequence of this a cautious over-design approach should be taken.

Glove Box Technology Ltd offers three basic designs, with carbon capacities of 1 litre, 5 litres and 8 litres. The 1 litre unit is for small glove boxes with low gas flow rates and small quantities of contaminants. The 5-litre unit is designed for general use in gas purged (open loop) or gas recirculated (closed loop) glove boxes with moderate quantities of contaminant. And the 8-litre unit is designed for harsh conditions in gas recirculated (closed loop) glove boxes.

The 1 litre unit is available in stainless steel, as an in-line trap with ½" BSP connections to either end, or in "open" ended design for connection to either a ½" BSP or NW16 outlet. The carbon charge is not included but can be supplied under separate instruction to customer requirements.

The 5-litre unit is available in stainless steel as an in-box trap and features an integrated inline HEPA filter. Connection to the glove box gas outlet (open loop) or gas recirculation system (closed loop) is through a NW40 outlet to the side of the carbon trap. Designed for removal through the glove box antechamber, the carbon trap should first be double bagged (PVC) and sealed with a cable tie prior to transfer to a fume cabinet for recharge. Recharge carbon must be oven dried prior to refill and must be dust free granular quality. The carbon charge is not included but can be supplied under separate instruction to customer requirements.

The 8-litre unit is available in stainless steel, as a self-contained floor mounted unit and is designed as a "break in" trap for fitting prior to the gas purifier using NW40 connections. Features an arrangement of 5 full bore stainless steel ball valves, three for permanent installation in the gas recirculation line to provide a gas bypass facility, and two permanently with the carbon trap, for isolating prior to removal to a fume cupboard for a carbon recharge. Additionally equipped with a compound gauge, and double valve quick disconnect for pluming into the vacuum line to remove air and trace moisture from the recharged and installed carbon trap. Recharge carbon must be oven dried prior to refill and must be dust free granular quality. The carbon charge is not included but can be supplied under separate instruction to customer requirements.

All carbon traps are designed on typical glove box gas flow velocity and volume rates to provide dwell times consistent with the removal of contaminants from our recommended carbon granule size with low gas pressure drop. Carbon capacity is based upon our experience of average duty requirements, and an annual service recharge to optimise filter efficiency and replacement economy.

Custom designed carbon traps can be of an integrated design or stand-alone units for installation into existing glove boxes. Large carbon traps are supplied with carbon filter racks equipped with safe change facilities.


© GLOVE BOX TECHNOLOGY LTD January 2004


Treatable Contaminants

Substances suffixed by a * require special treatment

Acetic acid Acetic anhydride
Acetone Acids
Acrolein Acrylic acid
Acrylonitrile Adhesives
Alcohol Allyl alcohol
Amines* Ammonia*
Amyl acetate Amyl alcohol
Amyl ether Aniline
   
Benzene Bromine
Butadiene Butyl acetate
Butyl alcohol Butyl cellosolve
Butyl chloride Butyl ether
Buryraldehyde Butyric acid*
   
Camphor Caprylic acid*
Carbolic acid* Carbon disulphide
Carbon tetrachloride Cellosolve (Ethyl Glycol)
Cellosolve acetate Chlorine
Chlorobenzene Chlorobutadiene
Chloroform Chloro nitropropane
Chloropicrin Chlorothene
Corrosive gases* Cresol
Crotonaldehyde Cyclohexane
Cyclohexanol Cyclohexanene
Cyclohexene  
   
Decane Dibromoethane
Dichlorobenzene Dichlorodifluoromethane
Dichloroethane Dichloroethylene
Dichloroethyl ether Dichloromonofluoromethane
Dichloro-nitroethane Dichloropropane
Dichlorotetrafluoroethane Diethyl amine
Diethyl ketone Dimethylaniline
Dimethylsulphate Dipentane
Dioxane Dipropyl ketone
   
Ether Ethyl acetate
Ethyl acrylate* Ethyl alcohol
Ethylamine Ethyl benzene
Ethyl bromide Ethyl chloride
Ethyl ether Ethyl formate
Ethyl mercaptan Ethyl silicate
Ethylene chlorhydrin Ethylene dichloride
Ethylene oxide  
   
Fluorotrichloromethane Formaldehyde*
Formic acid Freons
   
Genklene Glutaraldehyde
   
Heptane Heptylene
Hexane Hexylene (1-Hexane)
Hexyne (Butyl acetylene) Hydrogen bromide*
Hydrogen chloride* Hydrogen cyanide
Hydrogen fluoride* Hydrogen iodide*
Hydrogen selenide Hydrogen sulphide*
   
Indole Iodine
Iodoform Isocyanates
Isoprene Isopropyl acetate
Isopropyl alcohol Isopropyl ether
   
Lactic acid  
   
Mercaptans* Mercury*
Mesityl oxide Methyl acetate
Methyl acrylate Methyl alcohol
Methyl bromide Methyl butyl ketone
Methyl cellosolve Methyl cellosolve acetate
Methyl chloroform Methyl ether
Methyl isobutyl ketone Methyl formate
Methyl mercaptan* Methylal
Methylcyclohexane Methylcyclohexanol
Methylcyclohexanone Methylene chloride
Monochlorobenzene Monofluorotrichloromethane
   
Napthalene Nicotine
Nitric acids* Nitric Oxides*
Nitrobenzenes Nitroethane
Nitroglycerine Nitromethane
Nitropropane Nitrotoluene
Nonane  
   
Octalene Octane
Organic chemicals Ozone
   
Paradichlorobenzene Pentane
Pentanone Pentylene
Pentyne Perchloroethylene
Phenol Phosgene
Plastics Plasticisers
Poison gases* Propanol
Propionaldehyde Propionic acid
Propyl acetate Propyl alcohol
Propyl chloride Propyl ether
Pyridine  
   
Radiation products* Rubbers
   
Skatole Solvents
Stoddard solvent Styrene monomer
Sulphur compounds* Sulphur dioxide*
Sulphur trioxide Sulphuric acid*
   
Tarnishing gases Tetrachloroethane
Tetrachloroethylene Toluene
Toluene di isocyanate Toluidine
Trichloroethylene  
   
Urea Uric acid*
   
Valeric acid* Valericaldehyde
Vinyl chloride Vinyl chloride/acetate
   
Wood alcohol  
   
Xylene  

This list is not exhaustive and if a particular compound does not appear, please contact our technical sales department for further advice.

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Carbon Traps

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Carbon Traps

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Carbon Traps

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Carbon Traps

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