نتایج جستجو برای: Ethyl Benzene
تعداد نتایج: 53205 فیلتر نتایج به سال:
ethyl benzene used increasingly each year is the raw material of producing styrene monomer. this substanceis produced from benzene alkylation with ethylene or ethanol, depending on the availability and cost of rawmaterials. in this study benzene alkylation in the presence of ethanol in a catalytic fixed bed reactor inthree states of isotherm, adiabatic and non-isotherm-non-adiabatic is mathemat...
Background: Benzene and ethyl benzene are important indoor air pollutants, even in low amounts in office environment may cause risk for staff. The purpose of this study was to evaluate and determine the amounts of these pollutants in the office environment air of Yazd hospitals. Methods: In a cross-sectional study, 18 samples of the air in office units of two hospitals were collected in Decemb...
Background and aims : Toluene effects on the nervous system and causes numbness, lack of control in voluntary muscles and seizures. Ethyl benzene can also cause irritation of the eyes and throat and at higher concentrations it can damage the nervous system. Exposure with toluene and ethyl benzene may occur in different environments such as vehicle cabindue to possible emissions of vehicle int...
Background & Objectives : Exposure to different chemical compounds such as toluene and ethyl benzene occurs in workplaces, residency, and urban areas. Currently, vehicle cabin environment is one of the new exposure sources of passengers to these compounds. This study aimed to evaluate the effects of in-cabin decoration and deodorizer use on interior concentrations of toluene and ethyl be...
background: several effects of volatile organic compounds (vocs) have been recognized such as toxic and carcinogenic human health effects. to evaluate cancer risk of benzenes air samples were taken, at an automobile manufacturing painters in tehran following inhalation exposure. methods: to perform this study, cross-sectional was done in 2016. sampling was carried out by active pump sampler usi...
In this study, nanoporous silica aerogel and silica aerogel-activated carbon composites have been synthesized using a water glass precursor by cost effective ambient pressure drying method. Equilibrium and kinetics of benzene and ethyl benzene adsorption on silica aerogel and its composites have been measured in a batch mode at tree weights of adsorbent. For the first time, the experimental dat...
Abstract Title: Determination of benzene, toluene ,ethyl benzene and xylene (BTEX) in ambient air painting workshops car compared to the air surrounding residential areas during winter 1394 in Yazd city . MH.Salmani1 , MH. Ehrampoush2, MH.Mosadegh3 , SMH. Sharifi4* 1Depatment of Health , School of Health , Shahid Sadoughi University of Medical Sciences,YAZD, IRAN 2Depatment ...
Abstract Background and Aim: Benzene, toluene, xylene and ethyl benzene (BTEX) are the most important aromatic compounds in petroleum products. BTEX compounds due to their high vapor pressure, easily change to gas form and mixed with ambient air. Petroleum products loading workers are exposed to these compounds by the inhalation of BTEX compounds. The aim of this study was to evaluate the ef...
background and objectives: analytical methods for volatile organic compounds (vocs) in different samples need extraction of compounds, by applying hazardous solvents. solid phase micro-extraction (spme) is a solvent-free equilibrium extraction method, in which proper calibration can allow quantitative determinations of vocs at a very good sensitivity without the use of any organic solvent. vocs...
Background and purpose: Ethyl benzene is a toxic aromatic compound derived from petroleum hydrocarbons which usually enters the environment through leakage of oil industries and activities, wastes and effluents released by pharmaceutical industry, plastics, resins and petrochemicals. This study aimed to examine the feasibility of the use of MgO nanoparticles as catalysts in the ozonation proces...
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