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Disclosed is a method for removing the acidity from a mixture of 1,1,2 Trichloro, 1,2,2 Trifluoroethane and 1,1,1 Trichloroethan which are used as solvents in the manufacturing of electronic components.
English (United States)
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Acidity Removal from Halogenated Solvents
Disclosed is a method for removing the acidity from a mixture of 1,1,2
Trichloro, 1,2,2 Trifluoroethane and 1,1,1 Trichloroethan which are used as
solvents in the manufacturing of electronic components.
During manufacturing, large quantities of solvents evaporate a are absorbed
by activated carbon filters. The carbon filters are subsequently regenerated with
steam, and during the regeneration process, the aforementioned solvents
decompose slightly to form free hydrogen chloride and low molecular organic
acid. This prevents the condensed solvents from being recycled for use as
electronic grade chemicals, as corrosion of parts and materials would result.
It has been known to use synthetic resins to purify and upgrade liquids.
Since absorption properties of resins are governed by their porous structure and
by their chemical composition, resins may be effective in removing a wide range
The condensed solvents from the regeneration of the activated carbon filters
are collected in a holding tank. Solvents are passed through an absorption
column containing strongly basic anion resin TYPE 1, DOWEX SBR-P
(manufactured by Dow Chemical Corporation). The acidity contained in the
solvent mixture is absorbed in the resin. When the resin has reached saturation,
it can be regenerated using a solution of sodium hydroxide.
The acidity from the mixture of solvents is thus effectively removed, and the
solvents can then be re-us...