Reaction Mechanism for the Ozonization Course of NPnEO and NP
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摘要: 为提高再生水质量和回用安全性,采用臭氧氧化壬基酚聚氧乙烯醚(NPnEO)及其代谢产物壬基酚(NP),分析了臭氧氧化NPnEO的效果及其反应历程.研究结果表明,壬基酚聚氧乙烯醚的臭氧氧化主要发生在乙氧基链上,随着氧化进程的进行,各种聚合度NPnEO中的EO链发生断裂,聚合度随之减小,前10 min内,混合物中各聚合度的NPnEO所占的比例仍符合泊松分布.壬基酚极易被臭氧氧化,接触5 min后去除率可达到90%;壬基酚的臭氧氧化不完全,有壬醇类中间产物生成.Abstract: In order to improve the quality and security of reclaimed water to reuse,ozonization is used to oxidate nonylphenol ethoxylates(NPnEO) and nonylphenol(NP) that is one of bio-degradation products of NPnEO,and the mechanism of the oxidation reaction is analyzed.The results show that the ozonation processes of NPnEO mainly occur on the ethoxy chain (EO),which the EO chain of NPnEO with various polymerization degrees has been synchronously degradated into the smaller polymerization degrees.In the 10 minutes of the reaction,the rate of a various polymerization degrees in NPnEO mixtures meet the Poisson distribution.NP is easily to be oxidized by ozone,but incomplete.The removal rate of NP is 90% after 5 minutes of reaction.There are a lot of intermediary products to be produced in the ozonization process,which can be deduced to nonyl alcohol isomers based on the analysis of the mass spectrum of the byproducts.
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Keywords:
- recycling water /
- nonylphenol ethoxylates /
- ozonation /
- oxidation mechanism
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