Introduction An aromatics complex is a combination of process units that can be used to convert petroleum naphtha and pyrolysis gasoline (pygas) into the basic petrochemical intermediates: Benzene Toluene and Xylenes (BTX). Benzene is a versatile petrochemical building block used in the production of more than 250 different products. Ethylbenzene, cumene, and cyclohexane are the most important ...

In this study, the effect of inlet concentration pollutants, empty bed residence time (EBRT) and liquid recycling velocity on performance BTF was explored. The results showed best operating characteristics biotrickling filter for study were at an 500 mg/m3�Cthe EBRT 300s 25.46 m h-1. At condition, total removal efficiency pollutants can reach more than 90%. Among them, toluene ethylbenzene abov...

An improved method for direct oxidative coupling of o-xylene could provide streamlined access to an important monomer used in polyimide resins. The use of 2-fluoropyridine as a ligand has been found to enable unprecedented levels of chemo- and regioselectivity in this Pd-catalyzed aerobic oxidative coupling reaction. Preliminary insights have been obtained into the origin of the effectiveness o...

AIMS To evaluate a safe sputum processing method for detection of tuberculosis in developing countries. METHODS A sample processing method was developed in which acid fast bacilli were killed with 1% sodium hypochlorite and concentrated by flotation on a layer of xylene before staining by the Ziehl Neelsen or auramine O methods. RESULTS Best results were obtained by auramine O staining afte...

Research findings concerning benzene, toluene, ethylobenzene, meta-, para- and ortho-xylene as well as styrene (BTEXS) emission at public cemeteries during All Saints' Day are presented here. Tests were carried out at town-located cemeteries in Opole and Grodków (southern Poland) and, as a benchmark, at the centres of those same towns. The purpose of the study was to estimate BTEXS emissions ca...

Various metal-organic framework (MOFs) adsorbents show peculiar adsorption behaviour as they can adopt different crystal phases, each phase with its own adsorption characteristics. Besides external stimuli such as temperature or light, different species of guest adsorbate can trigger a transition (breathing) of the host structure at a different pressure. Such phase transitions also occur during...

A gas chromatographic method for simultaneous determination of hippuric and o-, m-, and p-methylhippuric acids (metabolites of toluene and xylene) in urine is described. The analytical procedure is based on the extraction of the aromatic metabolites with ethyl acetate containing the internal standard and on a methylation with 3-methyl-1-p-tolyltriazene. With this method, which does not require ...

The separation of mixtures with close boiling points is a critical task in the petrochemical industry, and one such mixture that requires o-xylene/styrene. STED process used to separate o-xylene/styrene, which contains certain amount organic sulfur product due limitations process. In this study, underwent enhancements attain effective styrene accomplish deep desulfurization. A sulfolane (SUL) N...

This study aimed to test the possible use of unmetabolized volatile organic compounds (VOCs) in urine as biomarkers of low-level indoor environmental exposure. Twenty-four subjects in 13 dwellings in a prefecture of Japan participated in this study. Air samples of the breathing zone were collected in the living room and bedroom, along with spot urine samples (before bedtime and first morning vo...