Dry Ice Trap Manual - LACO Technologies, Inc.
Contents
1. strength Do not use any other liquid such as acetone methanol water or similar products Initially the dry ice alcohol mixture will give off significant amounts of carbon dioxide gas and will eventually become a slurry that should typically last eight hours depending on the length of trap operation and gas load quantity LACO recommends that the cold well be at least 3 4 full at all times to produce the best trapping results The contents of the mixture can be viewed through the clear acrylic cover Additional dry ice and alcohol can 2 2010 LACO TECHNOLOGIES INC LACO USER MANUAL DRY ICE TRAPS 5 CLEANING Dry ice and alcohol in cold well To vacuum system E be added at any time To increase the longevity of the slurry do not remove the acrylic cover As mentioned the acrylic cover should be free to move For best trapping results the dry ice alcohol combination should be added to the dry ice trap and allowed to mix for a few minutes before the vacuum pump is turned on This will allow the dry ice trap to become very cold NOTE Donotallow trap to warm up while pumping as this will cause contaminants to warm up evaporate or sublime and in turn contaminate the pump 4 2 BASIC PARTS Figure 1 Basic Parts The operator can view the contaminants through the top of the large acrylic ring Cleaning should occur as required or if a reduction in trap performance is noted In addition the trap should b2. TECHNOLOGIES LACS USER MANUAL DRY ICE TRAPS CONTACT US LACRrrchnoiociEs PHONE FAX Toll Free 800 465 1004 Phone 801 486 1004 Fax 801 486 1007 ADDRESS LACO Technologies Inc 3085 West Directors Row Salt Lake City UT 84104 WEB www lacotech com infoolacotech com SMT 07 1005 revA2 ii 2010 LACO TECHNOLOGIES INC 1 2 3 CONTENTS 2010 LACO TECHNOLOGIES INC 1 SCOPE 2 SAFETY 3 OVERVIEW LACO USER MANUAL DRY ICE TRAPS This manual contains operation cleaning and maintenance information for LACO dry ice traps Our traps are designed to ensure safety when used properly It is the responsibility of the user to follow safety related warnings cautions notes and other reguirements described in this manual CAUTION Dry ice gives off a significant amount of colorless and odorless carbon dioxide gas which is heavier than air causing it to sink to low areas replacing breathable oxygen This could cause suffocation and therefore should only be used in a well ventilated room CAUTION Carbon dioxide gas will expand in the chamber and thus the top acrylic cover must be able to move freely Do not clamp or lay anything on top ofthis lid CAUTION Dry ice sublimates solid into gas at roughly a rate of 5 to 10 165 every 24 hours and therefore should be purchased and used only when needed CAUTION Isopropyl alcohol is a flammable colorless liquid Please keep away from open flam
3. 3 2 LYOPHILIZATION The LACO Dry Ice Trap can also be used in lyophilization or what is commonly known as freeze drying The trap would typically be used in the sublimation stage where ice is removed from a product and then condensed on the cold well In this stage a vacuum pump is connected to the dry ice trap which is in turn connected to the lyophilizer As the lyophilizer heats up slightly during this stage ice is turned to vapor which flows downstream where it is caught by the trap thus protecting the vacuum pump Because the LACO Dry Ice Trap is much colder than the cold surfaces typically used in lyophilizers the LACO trap provides a more efficient way to condense gases Table 1 Common Solvents SOLVENT EST VAPOR PRESSURE TORR 75 C Water 001 Acetone 5 Methanol 3 Isopropyl Alcohol a The data contained in this table is meant to provide general guidance on the use of the dry ice trap with common solvents It is not to be relied upon for making any calculations 4 1 OPERATING A DRY ICE TRAP 1 Connect the vacuum pump and pumping chamber to the dry ice trap as shown below 2 Add roughly 5 Ibs 2 3 kg of dry ice to the 3 5 quart 3 3 L cold well The dry ice should be crushed into small cubes 3 Add approximately 2 pints 946 4 ml Isopropyl alcohol This should be enough to safely fill the majority of the cold well For the best slurry consistency use Isopropyl alcohol of at least 90
4. Chamber and lid o rings should be replaced at the first sign of wear Table 2 Recommended Spare Parts List ITEM PART NUMBER DESCRIPTION 1 LMOR 443V70 Viton O Ring between Acrylic Ring and Shell 2 LMOR 438V70 Viton O Ring between Acrylic Ring and Cold Well 3 LMSA92068 Acrylic Cover Assembly 4 LMSA91174 Acrylic Ring Table 3 Accessories ITEM PART NUMBER DESCRIPTION 5 LVFGN25SV Centering Ring NW25 6 LVFCN25A Clamp NW25 Aluminum 7 LVODC150 Vacuum Grease For additional accessories please refer to www lacotech com or contact a LACO sales representative 4 2010 LACO TECHNOLOGIES INC
5. e heated surfaces some plastic surfaces and rubber coatings Water or other chemicals can shorten the life of a vacuum pump or limit its ability to reach its ultimate vacuum The LACO Technologies Dry Ice Trap is used to condense and trap condensable vapors before they reach the vacuum pump The Dry Ice Trap contains a mixture of alcohol and dry ice that is combined in a small cooling container called the cold well Placed inside a vacuum trap the contents of the cold well can easily reach a temperature of 100 F freezing many condensable gases that pass by it As condensable gases flow by the cold well they freeze and stick to the side ofthe well thus protecting the vacuum pump See Table 1 for a list of common chemicals and their estimated vapor pressures 3 1 DRY ICE TRAP FEATURES An acrylic cover is provided to monitor the dry ice alcohol slurry An additional outer acrylic ring is provided to view the accumulation of the trapped frozen gas on the outside surface of the cold well The shell of the vacuum chamber has been electro polished to ensure maximum vacuum performance and to enable easy clean up The chamber is equipped with NW flanges for quick connecting to a vacuum pump and the vacuum 1 2010 LACO TECHNOLOGIES INC 4 BASIC OPERATION LACO USER MANUAL DRY ICE TRAPS system These flanges are offset to enable the gas to flow around the greatest amount of surface area for maximum pump protection
6. e cleaned between each slurry batch The chamber shell ports and cold well are all stainless steel and can be cleaned easily with a water dampened cloth or other compatible chemicals Do not clean the cold well unless it has warmed to room temperature To clean the Dry Ice Trap 1 Turn off the vacuum pump and allow the Dry Ice Trap to come to at mospheric pressure by opening a venting valve 2 Removethe center well from the chamber and dispose of the slurry 3 Allow the well come reach room temperature then wipe down with water damp cloth as noted above Most of the contaminants will melt off after reaching a sufficient temperature 3 2010 LACO TECHNOLOGIES INC 6 MAINTENANCE LACO USER MANUAL DRY ICE TRAPS 4 Wipe the outside of the cold well to achieve its original sheen Mild soap with water can also be used but should be rinsed with clean or de ionized water To clean the acrylic lid 1 Useonly a damp or dry cloth 2 Donot use solvents on the acrylic lids To clean o rings 1 O rings may occasionally reguire cleaning Remove o rings completely and wipe them down with a dry or damp cloth 2 Apply a small amount of vacuum grease to the entire surface of the o ring 3 Remove excess with a lint free cloth NOTE Do not use abrasive cleaners on any part Centering rings on NW flanges should be periodically checked for cracks Aluminum clamps should be tight to eliminate the possibility of leaks
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