Abstract
The effect of the acoustic cavitation in organic liquids was investigated. Aliphatic and aromatic hydrocarbons, alcohols .aldehydes, ethers and ketones were sonicated. These organic liquids seemed to decompose at the high temperature site formed from adiabatic collapse of the cavities. The decomposition products from aliphatic and aromatic hydrocarbons were hydrogen, methane, ethylene, acetylene and higher alkanes and alkenes, and hydrogen, methane, ethylene, carbon monoxide, carbon dioxide and aldehydes from alcohols. Hydrocarbons involved aromatic and cyclic compounds having high vapor pressure more than lOmmHg have not been decomposed, however, alcohols having high vapor pressure up to 40mmHg have decomposed. Methanol solution of DPPH (1,1-diphenyl-2-picrylhydrazyl), radical scavenger, was sonicated to investigated the behavior of sonochemically formed radicals. It is considered that DPPH has too low vapor pressure to enter the cavity and scavenges free radicals migrated from the cavity at the interface region. The major product from DPPH was DPPH2 (1,1-diphenyl-2-picrylhydrazine) and three kind of unknown products were observed The rate of formation of products from methanol in the presence DPPH was almost same as that in the absence of DPPH. So, the decomposition of methanol mostly completed in the cavity.
