Ethylbenzene test sample

The acidity of pillared clays has been characterized by both microcalorimetric measurements of the adsorphon of aromatic molecules and pyridine and the catalytic ethylbenzene test reaction [111]. The aromatic probe molecules used were a reactant and a product of the catalytic reaction ethylbenzene and m-diethylben-zene, respectively. In this way, only the strongest of the accessible acid sites were htrated. The heats of adsorphon of these molecules indicate that a zirconium oxide pillared clay had stronger acidity than an aluminum oxide pillared clay, whereas the pyridine results were equal for both samples. 

Obtain samples of the following 11 organic liquids contained in individual small dropper bottles n-hexane (or other alkane), acetonitrile, methylene chloride, acetone, toluene, methanol, diethyl ether, ethyl acetate, ethylbenzene, ethanol, and chloroform. Then label each of the test tubes from step 1 with the names, or an abbreviation of the names, of these liquids. 

To determine the concentrations of benzene, toluene, ethylbenzene, and xylenes, approved methods (e.g., EPA SW-846 8021B, SW-846 8260) are not only recommended but are insisted upon for regulatory issues. Polynuclear aromatic hydrocarbons (PAHs) may be present in condensate, and evaluation of condensate contamination should include the use of other test methods (EPA SW-846 8270, SW-846 8310) provided that the detection limits are adequate to the task of soil and groundwater protection. Generally, at least one analysis may be required for the most contaminated sample location from each source area. Condensate releases in nonsensitive areas require analysis for naphthalene only. The analysts should ensure that the method has detection limits that are appropriate for risk determinations. 

A number of different testing kits based on immunoassay technology are available for rapid field determination of certain groups of compounds, such as benzene-toluene-ethylbenzene-xylene (EPA 4030) or polynuclear aromatic hydrocarbons (EPA 4035, Polycyclic Aromatic Hydrocarbons by Immunoassay). The immunoassay screening kits are self-contained portable field kits that include components for sample preparation, instrumentation to read assay results, and immunoassay reagents. 

The determination of mandelic acid in urine is recommended as a biological exposure test for ethylbenzene. The Biological Exposure Index (BEI) Committee of the American Conference of Governmental Industrial Hygienists recommends a mandelic acid concentration in urine of 1.5 g/g creatinine [about 10 mmol/L] as a BEI for ethylbenzene exposure. BEIs represent the levels of the determinants that are most likely to be observed in biological samples collected from healthy workers exposed by inhalation to air concentrations at the level of the TLV. Urine specimens must be collected during... 

PN-92/Z-04208.10 Air purity protection - Tests for phthalic acid esters - Determination of dibutyl phthalate vapors in permanent residence area air by gas ehromatography with sample enrichment PN-93/Z-04231.02 Air purity protection - Tests for content of harmful substances emitted during plastics processing - Determination of acetone, benzene, toluene, ethylbenzene 2-ethylhexanol, dibutyl phthalate and di-(2-ethylhexyl) phthalate in work places in the mixture emitted during poly(vinyl chloride) processing by gas chromatography... 

The results showed that the Pt3 catalyst had the lowest activity when compared to the conversion of ethylbenzene and better performance for the selectivity of o-xylene, further lower formation of nonaromatic compounds. It was observed that this catalyst remained away from the equilibrium conversion when compared to other catalysts tested it also showed increased coke formation for samples that have undergone deactivation forced. 

It is interesting to note that La,Na-X showed a 1.6 times higher conversion than the La,Na-Y zeolite, yielding benzene to diethylbenzene ratios of imity. The ranking of the catalysts with respect to their total acidity did not correlate with the activity in ethylbenzene disproportionation, while the concentration of very strong acid sites (Ho < -8.2) correlated very well with the catalytic activity of the faujasite-type materials. Sr- and Ba-Y samples, which do not possess strongly acidic sites, were not active in this test reaction. 

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