Patent ID: 8653015
Filing Date: 2014-02-18
Classification: C11D

Abstract:
1. A concentrated, non-aqueous solvent blend for use as a substitute for traditional commodity cleaning solvents, such as methanol and acetone, in reflux cleaning of soiled chemical manufacturing equipment, consisting of: a. at least three biodegradable solvents consisting of 1-methyl-2-pyrrolidone, normal propyl alcohol, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, ethyl lactate, propylene glycol n-propyl ether, propylene glycol phenyl ether, ethylene glycol n-butyl ether, diethylene glycol n-butyl ether, or mixtures thereof; wherein the selected solvents have a vapor pressure (mm Hg@25° C.) ranging from about 0.1 to about 7.0; a vapor density (air=1) ranging from 2.0 to about 6.0; a boiling point ranging from about 100° C. to about 300° C.; a specific heat (j/g/° C.) ranging from about 0.3 to about 2.3; a heat of vaporization (j/g@BP) ranging from about 250.0 to about 270.0; and a surface tension lower than that of water upon dilution with water the composition forms a low viscosity use solution.