Showing papers on "o-Cresol published in 1989"
Abstract: Ozone pretreatment studies of a refractory phenolic compound, o-cresol, were conducted to evaluate the effects of ozonation on the anaerobic biodegradability and toxicity of the reaction products. Two types of batch studies, the biochemical methane potential (BMP) and the anaerobic toxicity assay (ATA), were performed on samples with and without preozonation. The ozonation products were well fermentable to methane after about 50% reduction in chemical oxygen demand (COD) or 32% reduction in dissolved organic carbon (DOC) was achieved by ozonation regardless of the initial concentration of o-cresol. Salicylic acid, glyoxylic acid, oxalic acid, propionic acid, acetic acid, and formic acid were the oxidation products identified. The reaction products formed in the basic pH range were more biodegradable and less inhibitory than those formed in the acid pH range. Phenol degradation was more susceptible to inhibition caused by ozonation products than was acetate utilization.
6 citations
Patent•
05 Oct 1989
TL;DR: In this article, a vapor phase catalytic reaction of phenol with methanol in the presence of a metal oxide was carried out to obtain the subject compounds, purifying the compounds and thermally decomposing the discharged high-boiling substance at a specific temperature.
Abstract: PURPOSE:To recover the subject substances in the form of a valuable components such as phenol and to achieve the resource-saving effect, by carrying out vapor-phase catalytic reaction of phenol with methanol in the presence of a metal oxide to obtain the subject compounds, purifying the compounds and thermally decomposing the discharged high-boiling substance at a specific temperature. CONSTITUTION:Phenol and methanol are subjected to vapor-phase catalytic reaction at 250-600 deg.C in the presence of a metal oxide. The gaseous by-products, unreacted methanol, unreacted phenol, produced water and o-cresol and/or 2,6-xylenol are separated from the obtained reaction product. The high-boiling substances separated in the above separation process are decomposed by heating at >=300 deg.C, preferably about 320-350 deg.C to recover phenol, o-cresol and 2,6-xylenol. The heat source for the above heating method is especially preferably an organic thermal medium and the thermal decomposition is carried out usually for 2-4hr.