Formation of trace byproducts in the premixed flames of CH3Cl/C2H4

Date

1997-05-01

Author

Huang, JW
Onal, I
Senkan, SM

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

129
views

0
downloads

The chemical structure of an atmospheric pressure, fuel-rich (equivalence ratio 3.06), flat flame of a chloromethane and ethylene (CH3Cl/C2H4 = 1.99) has been studied experimentally using both heated microprobe and cold trap sampling techniques followed by high-resolution gas chromatography/mass spectrometry (GC/MS). The identities and absolute concentrations of more than 50 major and minor hydrocarbon and chlorinated hydrocarbon species have been established, including a large number of aromatics, substituted aromatics, and polycyclic aromatic hydrocarbons (PAHs). Although some chlorinated PAHs were also detected, unsubstituted aromatics dominated the PAH product distribution. Mole fractions determined were in the range of 0.45-2.0 x 10(-7), With the heaviest PAHs at mass 226 (C18H10, benzo[ghi]fluoranthene and cyclopenta[cd]pyrene). The measurements indicated the selective suppression of certain PAHs, e.g., cyclopenta[cd]pyrene, in the presence of HCl when compared to regular hydrocarbon flames. Heated silica surfaces of the sampling probe and transfer lines were also noted to chlorinate select PAHs, such as pyrene and acenaphthylene. The mole fraction profiles of many of the products first increased, then decreased, and increased again in the post-flame zone. A number of oxygenated aromatics were also detected. These measurements provide new information on the identities and levels of hazardous air pollutants formed in the incineration of chlorinated hydrocarbons and represent useful data for the development and validation of detailed reaction mechanisms.

Subject Keywords

Fuel-rich, Chemical structures, Methyl-chloride, Laminar flames, Pyrolysis, Oxidation, Mixtures, Pressure, Soot

URI

https://hdl.handle.net/11511/67083

Journal

ENVIRONMENTAL SCIENCE & TECHNOLOGY

DOI

https://doi.org/10.1021/es960596j

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Dissolution of colemanite and crystallization of gypsum during boric acid production in a batch reactor Erdoğdu, Anıl; Eroğlu, İnci; Department of Chemical Engineering (2004) One of the most commonly used boron compounds, boric acid, is produced by dissolving colemanite (2CaO₉3B2O3₉5H2O) in aqueous sulfuric acid whereby gypsum (CaSO4₉2H2O) is formed as a byproduct and must be separated from the main product. This process consists of two steps, dissolution of colemanite and formation of gypsum. The amount of boric acid formed depends on the first step, dissolution of colemanite. In the latter step, gypsum crystals are formed and stay in the reaction mixture to grow up to a size l...
Characterization and kinetics of light crude oil combustion in the presence of metallic salts Kök, Mustafa Verşan (American Chemical Society (ACS), 2004-05-01) In this research, a reaction cell, thermogravimetry (TG), and differential thermal analysis (DTA) were used to characterize the light crude oil combustion and kinetics in the presence of copper(I) chloride (CuCl) and magnesium chloride (MgCl2·6H2O). In TG-DTA experiments with magnesium chloride, three reaction regions were identified, known as distillation, low-temperature oxidation (LTO), and high-temperature oxidation (HTO). In the case of copper(I) chloride, two main transitional stages are observed with...
Production of lactic acid esters by reactive distillation Yalçın, Özgen; Karakaş, Gürkan; Hamamcı, Haluk; Department of Chemical Engineering (2011) The esterification of lactic acid with ethanol over Lewatit S 100, strong cation ion exchange resin catalyst, was studied in counter current vapor-liquid contactor type differential reactor by feeding ethanol and lactic acid solution as vapor and liquid phases, respectively. The ethanol vapor phase was diluted by dry air and the water removal was achieved by the mass transfer of water from liquid to vapor phase. Effect of ethanol to lactic acid feed molar ratio and vapor flow rate on fractional conversion a...
Characterization of zeolite membranes by gas permeation Soydaş, Belma; Kalıpçılar, Halil; Department of Chemical Engineering (2009) Zeolite membranes are attractive materials to separate gas and liquid mixtures. MFI is a widely studied zeolite type due to its ease of preparation and comparable pore size with the molecular size of many substances. In this study MFI type membranes were synthesized over porous α-Al2O3 supports and characterized with XRD, SEM and gas permeation measurements. In the first part of this study the effect of soda concentration of the synthesis solution on the membrane morphology and crystal orientation was inves...
Characterization of degradation products of polyethylene oxide by pyrolysis mass spectrometry Fares, M.M.; Hacaloğlu, Jale; Suzer, S. (1994-01-01) The techniques of direct and indirect (evolved gas analysis) pyrolysis MS are used to characterize the thermal degradation products of polyethylene oxide. Using direct pyrolysis MS technique the main degradation process is determined to be due to C~ and C~C scissions yielding fragments characteristic of the polymer. Evolved gas analysis indicates formation of small molecular stable compounds such as C2H•OCzH 5, CH3CHO, CO,, CO and C2H 4.

Citation Formats

J. Huang, I. Onal, and S. Senkan, “Formation of trace byproducts in the premixed flames of CH3Cl/C2H4,” ENVIRONMENTAL SCIENCE & TECHNOLOGY, pp. 1372–1381, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67083.