2results about "Preparation by ozonolysis" patented technology

Systems and methods are provided for ozonolysis of polycyclic aromatic hydrocarbons (PAHs) in a liquid CO2 reaction environment. It has been unexpectedly discovered that oxygen-containing functional groups can be added to PAH substrates while substantially avoiding combustion reactions and while reducing or minimizing formation of energetic intermediates. Because the formation of energetic intermediates is minimal, the ozonolysis can be performed at temperatures near ambient (e.g., between −10° C. and 50° C.) while still achieving a satisfactory safety profile. In various aspects, ozonolysis can occur while forming a reduced or minimized amount of water, such as forming substantially no water in the reaction environment.

The present invention provides a novel method for producing 1,9-nonane diol, with which 1,9-nonane diol can be efficiently produced with little environmental burden. This method for producing 1,9-nonane diol includes: (1) a step for blowing ozone gas into oleyl alcohol in such a way that ozone gas is blown until the ozone gas concentration at an outlet exceeds half the ozone gas concentration at an inlet, and the acid value of a treated product that has been treated with the ozone gas is 15 mg KOH / g or less; and (2) a step for hydrogenating, in the presence of a nickel catalyst, the treated product that has been treated with the ozone gas.