School of Environment, Tsinghua University, Beijing, China.
Environ Sci Technol. 2011 Aug 1;45(15):6539-44. doi: 10.1021/es200310p. Epub 2011 Jul 8.
Analytical pyrolysis was conducted to evaluate the major hazardous air pollutant (HAP) emissions from pyrolysis of bituminous coal and a furan binder, which are the two most commonly used casting materials for making green sand and furan no-bake molds in Chinese foundries. These two materials were flash pyrolyzed in a Curie-point pyrolyzer at 920 °C and slowly pyrolyzed in a thermogravimetric analyzer (TGA) from ambient temperature to 1000 °C with a heating rate of 30 °C/min. The emissions from Curie-point and TGA pyrolysis were analyzed with gas chromatography-mass spectrometer/flame ionization detector. Thirteen HAP species were identified and quantified in the pyrolysis emissions of the two materials. The prominent HAP emissions were cresols, benzene, toluene, phenol, and naphthalene for the bituminous coal, whereas they were m,p,o-xylenes for the furan binder. Xylenesulfonic acid, the acidic catalyst in furan binder, was found to be the major source of xylene emissions. Thermogravimetry-mass spectrometer monitored the evolution of HAP emissions during TGA pyrolysis. For both of the casting materials, most of the emissions were released in the temperature range of 350-700 °C.
采用热裂解分析法评估了烟煤和呋喃粘结剂热解过程中主要的危险空气污染物（HAP）排放，这两种物质是中国铸造厂制作型砂和呋喃自硬砂模具最常用的两种铸造材料。这两种材料在居里点热解仪中于 920°C 下进行快速热解，并在热重分析仪（TGA）中以 30°C/min 的升温速率从环境温度缓慢升温至 1000°C。采用气相色谱-质谱/火焰离子化检测器对居里点和 TGA 热解产生的排放物进行分析。在这两种材料的热解排放物中鉴定并定量了 13 种 HAP 物质。烟煤的主要 HAP 排放物为甲酚、苯、甲苯、苯酚和萘，而呋喃粘结剂的主要 HAP 排放物为二甲苯。在呋喃粘结剂中作为酸性催化剂的二甲苯磺酸被认为是二甲苯排放的主要来源。热重-质谱联用仪监测了 TGA 热解过程中 HAP 排放物的演变。对于这两种铸造材料，大部分排放物都在 350-700°C 的温度范围内释放。
