Solvent cleaning method

Enclosed vapor degreasers have become popular and necessary in the last two decades (Box 2.1). The reason is that non-solvent cleaning methods (particularly aqueous cleaning technology) don t provide adequate performance, and some users desire or need to use solvents about which there are SHE (safety, health, and environmental) concerns — particularly perchloroethylene, methylene chloride, trichloroethylene, and n-propyl bromide (in that order). 

Solvent-Cleaning Method. As received SAW devices were dip rinsed with chloroform, methanol and acetone. 

This procedure can be applied to most P2P mixes but is especially effective on the methods to follow. However, in super clean methods, such as the PdCl2 below, where lots of isosafrole is produced, the iso byproduct can interfere with crystal formation. Someone-Who-ls-Not-Strike once found that when an appreciable amount of isosafrole was formed to the detriment of MD-P2P, the oil screwed up the crystal matrix disallowing it to form. Confused, the chemist tried to rescue the uncrystallized oil from the aqueous solution by extracting out the oil to try other things. But when the solvent hit the solution, the P2P crystallized out. Go figure The... 

Other Gleaning Methods. Solvent cleaning, ie, degreasing, is chiefly used to remove grease and oil. Solvent is appHed to rags which are replaced when they become contaminated. The final rinse is always made using fresh solvent. Individual ship components can be solvent-cleaned by dipping in tanks of solvent. 

Care is needed to ensnre that the cleaning method is compatible with the flame arrester in terms of the materials of constmction and the arresters overall rohnstness. Snitahle cleaning methods inclnde the nse of solvents, water, steam, compressed air, or nltrasonics. 

The latter cleaning method would have removed completely the sodium chlorate, which is soluble in water but not in halogenated solvents [5],... 

Water Direct distillation or distillation of solvent-cleaned sample at acidic pH, react with 4-amino antipyrine and potassium ferricyanide at pH 10 or extract colored complex in chloroform Spectrophotometric (ASTM Method D-1783) <5 pg/L (chloroform extract) <0.1 mg/L (direct) NG ASTM 1978... 

Solvent cleaning, the oldest method, preferably in the vapour phase. There are severe restrictions on the use of solvents, chlorinated ones in particular, and safety, environmental and fire risks. Convenient solvents, which must be compatible with the substrate, can dissolve oils, greases and other organic contaminants. Generally, the parts... 

Even in spite of their low investment costs vrater jet pumps and steam ejectors are being replaced in the laboratories more and more by diaphragm pumps because of the environmental problems of using vrater as the pump fluid. Solvent entering the vrater can only be removed again through complex cleaning methods (distillation). 

The existing cleaning methods can be divided into wet and dry cleaning. The wet cleaning process uses a combination of solvents, acids, surfactants and deionized (DI) water to spray and dissolve contaminants from the surface area. The Dl water is used to rinse after each chemical use. The oxidation of the wafer surface is sometimes integrated into the cleaning... 

A clean, solvent-free method has been developed for the bis-hydroxylation of alkenes by the use of Nafion-based acidic catalysts and 30% H202.655 Nafion NR50 and SAC-13 exhibited high activity in the oxidation of isomeric C alkenes, cyclohexene [Eq. (5.228)], 1,4-cyclohexadiene, and allylic alcohols in the temperature... 

Wipe and liquid samples from pyrolized transformer oil (CDDs) Extraction with organic solvent clean-up on neutral silica/basic silica/acidic silica column clean-up and fractionation by sequential chromatography on basic alumina, carbon/silica gel, and Sepralyte columns HRGC/HRMS No data 58-151 (wipe) 51-136 (liquid) Hardin et al. 1989 (ASME method)... 

---