脲醛树脂合成及其脱硝性能研究  

Study on the Synthesis and Denitrification Performance of Urea Formaldehyde Resin

作　　者：张彬彬 刘俊 许战峰 张昭军 王琪 ZHANG Bin-bin;LIU Jun;XU Zhan-feng;ZHANG Zhao-jun;WANG Qi(Anhui Zhonghuan Environmental Protection Technology Co.,Ltd,Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province,Hefei 230001,China;School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽中环环保科技股份有限公司,工业园区污染治理与资源化利用安徽省联合共建学科重点实验室,安徽合肥230001 [2]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《安徽化工》2024年第5期75-78,共4页Anhui Chemical Industry

摘　　要：采用尿素和甲醛合成了脲醛树脂,对合成的树脂进行了红外和热重表征,并考查其脱硝性能。结果表明:尿素全部参与反应,成功合成了脲醛树脂。脲醛树脂的耐热性能明显高于尿素,且其在850℃的脱硝量达到165.70 mg(NO)/g(树脂),远高于尿素的11.84 mg(NO)/g(尿素)。脲醛树脂在700℃~900℃范围内均体现脱硝性能,且随着温度的升高,脱硝性能先增大后减小,850℃性能最佳。这可能与脲醛树脂分解产生活性氨的速率和脱硝反应速率匹配性有关,低温下反应速率慢,脱硝效果差;高温下脲醛树脂分解速率过快,导致脱硝持续时间短。当模拟烟气中含有氧气时,脱硝性能急剧下降,此时存在活性氨的脱硝速率和氧化速率竞争问题。不含添加剂时,活性氨氧化速率高于脱硝速率,出现烟气中NO浓度高于初始浓度的现象。当脲醛树脂中加入Fe_(2)O_(3)促进脱硝反应速率时,脱硝性能得到提升,未出现NO浓度高于初始浓度的现象。脲醛树脂与Fe_(2)O_(3)复合具有较好的脱硝性能和耐氧化性能,可用于工业炉内高温烟气脱硝。Urea formaldehyde resin was synthesized using urea and formaldehyde,and the synthesized resin was characterized by FT-IR and TG analysis.The denitrification performance of the resin was evaluated.The results showed that the urea formaldehyde resin was successfully prepared,and all urea participated in the polymerization reaction.Thermogravimetric analysis shows that the heat resistance of urea formaldehyde resin is significantly higher than that of urea.And its denitrification amount at 850℃reached 165.70 mg(NO)/g(resin),much higher than that of urea 11.84 mg(NO)/g(urea).Urea formaldehyde resin exhibits denitrification performance in the temperature range of 700℃~900℃,and the denitrification performance increases firstly,and then decreases with the increase of temperature.850℃has the best performance.The best performance is achieved at 850℃.This may be related to the matching of the reaction rate between the decomposition of resin to produce active ammonia and the denitrification reaction rate of active ammonia.At low temperatures,the reaction denitrification rate is slow and the denitrification performance is poor.At high temperatures,the decomposition rate of resin is too fast,resulting in a short duration of denitrification.When oxygen presents in the flue gas,the denitrification performance drops sharply.At this time,there is a competition problem between denitrification rate and the oxidation rate of the active ammonia.When there are no additives,oxidation rate of the active ammonia is higher than the denitrification rate,resulting in a phenomenon where the NO concentration in the flue gas is higher than the initial concentration.When Fe_(2)O_(3)is added to the resin to promote the denitrification rate,the denitrification performance is improved,and there is no phenomenon of NO concentration higher than the initial concentration.The composite of urea formaldehyde resin and Fe_(2)O_(3)has good denitrification and oxidation resistance performance,and can be used for high-temperature flue gas denitrif

关 键 词：脲醛树脂 高温 脱硝 

分 类 号：X511[环境科学与工程—环境工程] TQ319[化学工程—高聚物工业]