己内酰胺在硫酸铵晶体表面吸附特性  

Adsorption of caprolactam on surface of ammonium sulfate crystal

作　　者：何晓辉[1,2] 雍玉梅[2] 禹耕之[2] 张广积[2] 杨超[2] 金鑫[1] 

机构地区：[1]北京化工大学理学院,北京100029 [2]中国科学院过程工程研究所,北京100190

出　　处：《化工学报》2010年第11期2849-2854,共6页CIESC Journal

基　　金：国家自然科学基金项目(20976177;20990224);国家杰出青年科学基金项目(21025627);中国石油化工股份有限公司项目(209030);国家重点基础研究发展计划项目(2007CB613507)~~

摘　　要：In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide(CPB),dodecyltrimethylammonium bromide(DTAB),non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate(SDS)and sodium dodecyl benzene sulfonate(SDBS)increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases.In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide（CPB）,dodecyltrimethylammonium bromide（DTAB）,non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate（SDS）and sodium dodecyl benzene sulfonate（SDBS）increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases.

关 键 词：吸附 硫酸铵 酰胺油 表面活性剂 

分 类 号：TQ028[化学工程]