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ID:35126000
大小:2.07 MB
页数:57页
时间:2019-03-19
《试析提高干法腈纶装置废气中低浓度dmf的回收率研究》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、天津大学硕士学位论文提高干法腈纶装置废气中低浓度DMF的回收率研究姓名:张连敏申请学位级别:硕士专业:化学工程指导教师:李祥高;于飞20070801摘要抚顺石油化工公司腈纶化工厂采用美国杜邦的干法纺丝技术生产腈纶,以丙烯腈为主要单体,同丙烯酸甲酯、苯乙烯磺酸钠发生聚合反应,制得聚丙烯腈,用二甲基甲酰胺(D肝)为溶剂制得纺丝原液。在后续的纺丝、水洗牵伸、干燥等生产工序中排放了低浓度废气,经过淋洗后将含有DMF的溶液送至回收装置进行DMF回收利用。杜邦干法腈纶装置纺丝工序排放的DMF废气浓度低,约为500mg/m3,在淋洗塔中传质动力小,回收过程能源消耗高;干燥机产生的
2、DMF废气进入后纺淋洗塔,后纺淋洗塔为筛板塔,效率较低,而且DMF废气输送距离过长、位差较大,造成动力消耗过高。国内其他干法腈纶装置正在进行技术改造,提高DMF回收率以获得较小的DMF消耗量。本文通过理论研究,采用活性碳纤维吸附技术,将低D肝含量废气浓缩,然后再淋洗回收,可提高传质效率,尤其是大幅度降低能耗。增设以活性碳纤维为吸附材料的在线连续吸附解吸设备,设计高效淋洗塔,改进原有低浓度DMF废气回收方案,将产生较好的节能效益,同时也减小了环境污染。关键词:二甲基甲酰胺;废气;回收;改进AbstractTheAcrylicFiberPlantofFushunPetr
3、ochemicalCorporationproducesacrylicfiberutilizingdryspinningtechniqueownedbyDuPont.Poly(acrylonitrile)isproducedbypolymerizationofacrylonitrile,themainmonomer,withacrylicacidmethylesterandsodium4-vinylbenzenesulfonate.ThespinningsolutionispreparedusingDMFasthesolvent.Duringtheconsequen
4、tproceduresincludingspinning,waterflushinganddrawinganddrying,low-concentrationexhaustgasisemittedandwashedwithwater.TheresultantDMF.containingsolutionissenttotherecycleequipmentforreuse.Sincetheconcentrationoftheexhaustgasislow,only500medm3,themasstransferdrivingforceforwashingisweaka
5、ndthustheenergyconsumptionforrecyclingisratherhilgh.TheexhaustDMFgasemittedfi'omthedryeriswashedinthewashingtower.Thewashingtowerisasieve—platetowerwithlowefficiency.Inaddition,thetransportdistanceofexhaustDMFgasistoolongandthepositiondifferenceislarge,resultinginhighpowerconsumption.T
6、echnicalreformationsarebeingcardedoutintheotherdry—spunacrylicfiberplantstoincreasetheDMFrecyclingefficiencyandthusreducetheDMFconsumption.Basedontheoreticalstudy,inOurwork,adsorptionprocessusingactivecarbonfiberastheadsorbentisappliedtoconcentratetheexhaustDMFgasbeforebeingwashed.Them
7、asstransferefficiencyisenhancedandtheenergyconsumptionissignificantlyreduced.Theenergyconservationbenefitwillbeincreasedandtheenvironmentalpollutionwillbeloweredbysettingupallonlinecontinuousadsorption.desorptionequipmentfilledwithactivecarbonfiber,designingahigh-efficiencywashingtow
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