Modified Alcohols Part 2

How does solvent cleaning work in an airtight degreaser? It is important to understand the cleaning system in its functions How does solvent cleaning work in an airtight degreaser? Efficiency of solvent cleaning in closed / airtight machines Amounts per 100 kg oil removed solvent 745 kg OPEN MACHINE air emissions 520 kg waste 233 kg How does solvent cleaning work in an airtight degreaser? Efficiency of solvent cleaning in closed / airtight machines How does solvent cleaning work in an airtight degreaser? Efficiency of solvent cleaning in closed / airtight machines Amounts per 100 kg oil removed Closed cleaning equipment solvent 745 kg The distillation unit of the cleaning equipment enables the re-use of the solvent solvent 160 kg solvent 15 kg Solvent monitoring enables the longer use of the solvent OPEN MACHINE CLOSED MACHINE CLOSED MACHINE & CPS air emissions 520 kg waste 233 kg air emissions 10 kg waste 150 kg air emissions 10 kg waste 5 kg Why do you need to stabilize? The “LITTLE CHEMICAL REACTOR” oil oil oil Cl -C-C- Solvent Ester S oil TMP -C-C- Water HEAT METAL (catalytic effect) Why do you need to stabilize? The “LITTLE CHEMICAL REACTOR” Volatile contamination Separated in water separator Weak acid Sulfuric acid (+Smell) Hydrochloric Acid Water oil TMP R-COOH HEATH S HCl Solvent Reused 2 Disposed Stabilization for increased process safety and reliability pH / alkalinity Process safety Safety Zone Corrosion Risk ? DUALENE™ 1601 S and DOWCLENE™* 1621 are already alkaline in their first delivery. DOWCLENE™* 1601 can be stabilized to ensure they work in the safety zone from the very beginning. time Continue solvent monitoring and stabilization (if required) to safeguard your equipment and extend solvent lifespan. Mandatory monitoring with MAXICHECK™ test kits reveals potential challenging situations and provides recommendation on addition of stabilizer if required. Benefits of use of modified alcohols in airtight machine COST EFFICIENCY • Continuous solvent recovery via built-in distillation • Long solvent lifespan • Less solvent consumption • Fewer bath exchanges • Less solvent waste • Modified alcohols‘ ability to process both polar and nonpolar contaminations may reduce need for additional cleaning processes PROCESS SECURITY • Easy monitoring of solvent condition with test kits • Reliable cleaning results  High solvent quality in rinsing step  Vapor degreasing as last cleaning step • Vacuum drying reduces risk of solvent trapped in blind holes ENVIRONMENTAL PROTECTION • Virtually no air emissions • Minimal risk of contaminating ground water (hermetically sealed construction) • Operators have virtually no contact with chemicals AGENDA 01 - What are modified alcohols? 02 - How do they work? 03 - Is it useful for me? Is it useful for me? Non polar / water insoluble Water soluble / polar Hydrocarbons Water Halogenated solvents (DOWPER™*/MECTHENE™*) Modified alcohol (DOWCLENE™* 1601) Modified alcohol (DUALENE™ 1601 S) Modified alcohol (DOWCLENE™* 1611) Modified alcohol (DOWCLENE™* 1621) Modified alcohol/Hydrocarbon in a hybrid process (DOWCLENE™* 1601 or 1621/Water) Oil Waxes Petroleum Fats Resins Corrosion Protection Inhibitor Ester Tensides Salts Emulsions Emulsion residues EP additives AW additive Surfactants Is it useful for me? • Which type of metal gets cleaned? (e.g. iron, brass, copper, aluminum, titanium) • How big are the metal parts? • What is the condition of the metal surface? (e.g. blind holes) Is it useful for me? Requested surface tension of the metal surface after the cleaning process General cleaning With Hydrocarbons Wafer-thin film remains on the metal surface With water Chemicals required Energy consumption Waste disposal Precision cleaning Halogenated Solvents or Modified Alcohol Residue-free drying on the surface With water Same as normal cleaning + high space requirement CUSTOMER EXAMPLE Customer example – HS Marston Aerospace Limited Use of DOWCLENE™* 1601 • • Supplier of aerospace industry Production of heat exchangers for aircrafts Cleaning requirement: • Cleaning of heat exchangers • Brazing process after cleaning 2011 Chlorinated Solvent Water-based Cleaning N-Propylbromide Fluorinated Solvent Time Modified Alcohol 2020 3rd Machine Installation Customer example – HS Marston Aerospace Limited What about aqueous cleaning? Aqueous cleaning has its benefits too! • For polar contaminations • When working wet-in-wet (e.g. water-based painting, galvanization) • Cleaning can be combined with surface finishes (phosphating, chromating etc) or deposition of protective coatings • In-line processes possible • Due to different formulations, potential to adapt to the cleaning requirements Key differences between solvent cleaning and aqueous cleaning • • • • Cleaner concentration remains constant for consistent cleaning results Cleaning process in one working chamber – no product carry-over Closed system under vacuum Solvent recycling through internal distillation • • • • Cleaner concentration must remain constant for consistent cleaning results Cleaning process takes place in several cleaning and rinsing baths – therefore product carry-over Change in cleaner concentration due to evaporation Regular re-dosing or replacement necessary