The adsorption of propylene on clean and hydrogen-covered Pd(1 1 1) has been studied by using temperatureprogrammed desorption (TPD) and reflection-absorption infrared spectroscopy. Propylene adsorbs in a di-r configuration on clean Pd(1 1 1). At high exposures, it forms second and subsequent layers. Upon heating, propylene desorbs molecularly at 200 and 280 K and, in contrast to ethylene adsor...

The main goal of this study was to describe the method of the synthesis of the dodecyl-, tetradecyl-, hexadecyl- and octadecyl-propylene glycol emulsifiers in the presence of selected anionic and nonionic surfactants. Acyl propylene glycol emulsifiers were produced by esterification of propane-1,2-diol (propylene glycol, PG) with C12:0-C18:0 fatty acids in the presence of anionic sodium dodecyl...

A new methacrylate monomer with two propylene glycol groups on the side chain, di(propylene glycol) methyl ether (diPGMA), was synthesised and homo- co-polymerised for first time.

Chronic exposure to propylene does not result in any increased incidence of tumors, yet does increase N7-hydroxypropylguanine (N7-HPGua) adducts in tissue DNA. To investigate any potential for genotoxicity (mutagenicity or clastogenicity), male F344 rats were exposed via inhalation to up to 10,000 ppm propylene for 1, 3, or 20 days (6 h/day, 5 days/week). The endpoints examined included gene (H...

Propylene and acetylene are released to mine air with the increase in the temperature of self-heating coal. Concentrations of these gases in mine air are applied as indicators of the progress of the self-heating process. Hydrocarbons emitted from the self-ignition center are sorbed on coal, while migrating through the mine workings. Coal crushed during the mining process is characterized by a h...

Propylene is an important chemical intermediate in the chemical industry, which is conventionally produced either as a co-product to ethylene in steam crackers or byproductin refineries. With the increase in exploration of shale gas, new cracker projects for ethyleneproduction are based primarily on ethane feedstock, which yield almost no propylene [1,2] Onthe other hand, the demand...

frothers havea profoundeffectonbubble size and also flotation efficiency. in present study the effect of type and dosage of frothers on the flotation response of coarse particles of quartz was investigated.  therefore, flotation response of coarse particles using frothers such as mibc, pine oil, poly propylene glycol with concentration of 0, 25, 50 and 75 g/t, was obtained respectively. for all...