系列窄分布醇醚羧酸盐氧化法制备及性能研究
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摘要
以系列窄分布醇醚(AEO_3/AEO_5/AEO_7/AEO_9)、氧气和氢氧化钠为原料氧化法合成窄分布醇醚羧酸盐(AEC_3/AEC_5/AEC_7/AEC_9),并优化窄分布AEC_7(7EO醇醚羧酸盐)合成工艺条件,同时考察了系列窄分布醇醚羧酸盐在不同pH值下的表面张力、泡沫性能和润湿性能。结果表明,钯碳负载催化剂用量为醇醚质量的0.4%(以氯化钯计),AEC_7合成优化条件为:反应温度75℃,氧压0.03 MPa,反应转速700 r/min,原料窄分布AEO_7与氢氧化钠摩尔比1∶1.02,产率达到93.8%;体系酸碱度对窄分布醇醚羧酸盐性能影响明显,在中性条件下,与AEC_3/AEC_5/AEC_9相比,AEC_7表面张力最大为41.66 mN/m;酸性条件下,AEC_3(3EO醇醚羧酸盐)发泡性最弱,碱性条件下,AEC_3发泡性最强;在中性和碱性条件下,窄分布AEC_3和AEC_5/AEC_7/AEC_9相比,在润湿和表面张力方面具有明显优势。
A series of fatty alcohol ether carboxylates(AEC)with narrow distribution(AEC_3/AEC_5/AEC_7/AEC_9)were synthesized by oxidation and using narrow distribution AEO(AEO_3/AEO_5/AEO_7/AEO_9),oxy gen and sodium hydroxide as raw materials.The process conditions of synthesis of narrow distribution AEC_7(7EO units)were optimized.The surface tension,foaming performance and wettability of a series of narrow distribution AEC at different pH values were also investigated.The results show that:Given that the palladium carbon supported catalyst is in an amount corresponding to 0.4%of the mass of alcohol ether(by palladium chloride),the opt imized conditions to synthesize AEC_7 are as follows:the reaction temperature is 75℃,the oxygen pressure is 0.03 MPa,the rotating speed is 700 r/min,the molar ratio of narrow distribution AEO_7 to NaOH is 1∶1.02,and the yield thus obtained can rea ch 93.8%;The pH value has significant effects on the properties of AEC with narrow distribution.Among the AECs under investigation,the surface tension of AEC_7 being 41.66 mN/m is the highest compared with AEC_3/AEC_5/AEC_9 under neutral conditions;AEC_3(3EO units)has the weakest foaming performance under acidic conditions and the strongest foaming performance under alkaline conditions;Among the narrow distribution AECs,AEC_3 has obvious advantages in wetting and surface tension compared with AEC_5/AEC_7/AEC_9 under neutral and alkaline conditions.
A series of fatty alcohol ether carboxylates(AEC)with narrow distribution(AEC_3/AEC_5/AEC_7/AEC_9)were synthesized by oxidation and using narrow distribution AEO(AEO_3/AEO_5/AEO_7/AEO_9),oxy gen and sodium hydroxide as raw materials.The process conditions of synthesis of narrow distribution AEC_7(7EO units)were optimized.The surface tension,foaming performance and wettability of a series of narrow distribution AEC at different pH values were also investigated.The results show that:Given that the palladium carbon supported catalyst is in an amount corresponding to 0.4%of the mass of alcohol ether(by palladium chloride),the opt imized conditions to synthesize AEC_7 are as follows:the reaction temperature is 75℃,the oxygen pressure is 0.03 MPa,the rotating speed is 700 r/min,the molar ratio of narrow distribution AEO_7 to NaOH is 1∶1.02,and the yield thus obtained can rea ch 93.8%;The pH value has significant effects on the properties of AEC with narrow distribution.Among the AECs under investigation,the surface tension of AEC_7 being 41.66 mN/m is the highest compared with AEC_3/AEC_5/AEC_9 under neutral conditions;AEC_3(3EO units)has the weakest foaming performance under acidic conditions and the strongest foaming performance under alkaline conditions;Among the narrow distribution AECs,AEC_3 has obvious advantages in wetting and surface tension compared with AEC_5/AEC_7/AEC_9 under neutral and alkaline conditions.
引文
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[3]Yang Qingli, Xue Boren, Zhang Yanshan, et al. Alkyl glycoside and alcohol ether carboxylate complex and its application in washing liquid[J]. Detergent&Cosmetics, 2012, 35(1):21-23.
[4]Li Yunling, Li Qiuxiao, Li Ming, et al. Synthesis and properties ofalcoholethercarboxylatebyoxidation[J].Speciality Petrochemicals, 2009(5):5-7.
[5]Yang Yongnian, Wen Pengpeng, Guo Jianguo, et al. Narrow distribution of downstream derivatives of alcohol ether[J].Detergent&Cosmetics, 2016, 39(8):39-42.
[6]Yi Ran, Wang Li, Xie Si, et al. Narrow distribution of dodecyl ether(2)synthesis and properties of sodium carboxylate[J].Journal of South China Normal University(Natural Science Edition),2014, 46(5):76-79.
[7]Li Yunling, Song Yongbo, Hou Suzhen, et al. Synthesis and properties of alcohol ether carboxylate[J]. Detergent&Cosmetics,2014(37):21-24.