Abstract: The present invention is directed to a printing composition, in particular, a paste printing ink vehicle for effecting the setting of a paste printing ink by penetration into a substrate, the vehicle utilizing a vegetable oil fatty acid esterified with a simple alcohol or glycol as a solvent. The use of the esterified fatty acid as a solvent in the printing ink vehicle enables the production of novel petroleum distillate free paste printing inks having characteristics substantially similar to that of conventional petroleum distillate based printing inks.

Abstract: Process and apparatus is disclosed for purifying waste gases containing minute pollutant liquid and solid particles. The process comprises treating the gas stream with a fine spray of scrubbing liquid by introducing into the gas stream the spray of droplet size in range of 1 micron or less. The scrubbing liquid is mixed with pollutant particles to wet and enlarge them in a turbulent region without appreciably increasing the pressure of the gaseous stream. The mixed gas stream is passed out of the turbulent region to a zone for removing the enlarged conglomerated contaminate particles from the gas stream. Apparatus is disclosed in which the process is carried out.