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《己内酰胺中挥发性碱杂质的控制.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、石油学报(石油加工)2012年4月ACTAPETROLEISINICA(PETROLEUMPROCESSINGSECT10N)第28卷第2期文章编号:1001—8719(2012)02—0225—06己内酰胺中挥发性碱杂质的控制胡合新,孙斌王恩泉(中国石化石油化工科学研究院,北京100083)摘要:针对己内酰胺成品中c。~C直链酰胺、苯胺和己二酰亚胺等挥发性碱杂质含量偏高,影响产品质量的问题,研究了杂质控制方法。考察了真空蒸馏、树脂吸附、酸性/碱性水解等方法降低挥发性碱杂质含量的效果,并跟踪分析了工业装置中环己酮杂质对己内酰胺产品质量的影响。结果表明,
2、真空蒸馏仅能脱除约2O正戊酰胺;Amberlyst强酸性树脂容易吸附脱除碱性较强的NH。,而难以吸附脱除碱性弱的正戊酰胺、正己酰胺;Na0H质量分数由0增至500~g/g时,加速了挥发性碱杂质的水解速率,但也促进己内酰胺开环水解、低聚等副反应;HSO溶液中添加NaNOz进行重氮化反应,明显加快了正戊酰胺、正己酰胺的水解速率,但大量己内酰胺同时存在时,HzSO易与己内酰胺发生络合反应,导致杂质基本不进行水解反应。通过严格限制环己酮中己醛和2一庚酮杂质质量分数至2O~30>g/g,挥发性碱杂质含量明显下降,己内酰胺优级品率可达到100。关键词:己内酰胺;产
3、品质量;挥发性碱;杂质中图分类号:TQ31.86文献标识码:Adoi:10.3969/j.issn.1001-8719.2012.02.010ControlMethodsoftheContentofVolatileBaseImpuritiesinCaprolactamHUHexin。SUNBin.WANGEnquan(ResearchInstituteofPetroleumProcessing,SINOPEC,Beijing100083,China)Abstract:Tosolveoff—specificationproblemofcaprolacta
4、m,causedbythevolatilebaseimpurities,suchasC3一C7amides,C6imidesandaniline,somemethodstocontrolthecontentofvolatilebaseimpuritieswereinvestigated,includingvacuumdistillation,resinadsorption,hydrolysis.Resultsshowedthatonly209/5(massfraction)ofpentylamidewasremovedbyvacuumdistillat
5、ion.RemovalefficiencyofammoniaonstronglyacidiccationexchangeresinAmberlystwashigherthanthatofpentylamideandhexoamide,whichmightbeattributedtothestrongeralkalinityofammonia.AstheNaOHmassfractionincreasedfrom0to500/,g/g,hydrolysisratesofpentylamideandhexoamidewerepromoted,buttheri
6、ng—openingpolymerizationofcaprolactamincreasedsimultaneously.AsaddingNaNO2intheH2SO4solution,conversionsofpentylamideandhexoamideincreasedsignificantly.However,ifcaprolactamexistedintheH2SO4solutionsystem,thecomplexformationofcaprolactamwithH2SO4willcompletelyrestrainthehydrolyt
7、icreactionofpentylamideandhexoamide.Aftercontrollingtheamountsofhexanaland2一heptanoneineyclohexanone,thecontentofvolatilebaseimpuritiesremarkablydecreased,thustheratioofproductwascomingupto100,thestandardoftop—gradeproduct.Keywords:caprolactam;productquality;volatilebase;impurit
8、ies收稿日期:201卜0415基金项目:中国石油化工股份有限公司“十条龙攻关”项目($208
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