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1、石油化工·924·PETR0CHEMICALTECHNOLOGY2014年第43卷第8期常規(guī)和雙效變壓精餾工藝分離乙醇胺和三乙烯二胺的模擬楊建明,袁俊,趙鋒偉,惠豐,呂劍,伊春海(1.西安近代化學(xué)研究所,陜西西安710065;2.西安交通大學(xué)化工學(xué)院,陜西西安710049)[摘要]基于乙醇胺和三乙烯二胺物系共沸組成隨壓力變化顯著的特點(diǎn),采用常規(guī)變壓精餾工藝分離乙醇胺和三乙烯二胺物系;為降低常規(guī)變壓精餾工藝的能耗,提出雙效精餾和變壓精餾耦合的雙效變壓精餾新工藝。采用AspenPlus化工流程模擬軟件對(duì)常規(guī)變壓精餾工藝和雙效變壓精餾工藝進(jìn)行模擬。模擬結(jié)果表明,采用常
2、規(guī)變壓精餾工藝和雙效變壓精餾工藝都能實(shí)現(xiàn)乙醇胺和三乙烯二胺物系的分離,乙醇胺和三乙烯二胺的純度都可達(dá)到99.90%(W);與常規(guī)變壓精餾工藝相比,采用雙效變壓精餾工藝,加熱公用工程可節(jié)fl~29.65%,冷卻公用工程可節(jié)能31.51%。【關(guān)鍵詞]乙醇胺;三乙烯二胺;共沸物;常規(guī)變壓精餾;雙效變壓精餾;節(jié)能[文章編號(hào)]1000—8144(2014)08—0924—05[中圖分類號(hào)]TQ028[文獻(xiàn)標(biāo)志碼]ASimulationofSeparationofMonoethanolamineandTriethylenediaminebyCommonandDoubleEf
3、ectPressureSwingDistillationYangJianming,YuanJun,ZhaoFengwei,Huifeng,LiiJian,MChunhai(1.Xi’anModemChemistryResearchInstitute,Xi’allShaanxi710065,China;2.SchoolofChemicalEngineering,Xi’anJiaotongUniversity,Xi’anShaanxi710049,China)[Abstract]Pressureswingdistillationforseparatingmonoet
4、hanoiamineandtriethylenediaminewasproposedbasedonthefeaturethattheazeotropiccompositionofthesystemwasinfluencedbypressuredifferenceinthesystem,anddoubleeffectpressureswingdistillationwhichwasdoubleefectdistillationcoupledwithpressureswingdistillationwasproposedtosaveenergyofthesystem
5、.ProcesssimulationforthepressureswingdistillationanddoubleeffectpressureswingdistillationwascarriedoutbyusingtheAspenPlussoftware.Theresultsshowedthatmonoethanoiamineandtriethylenediaminewithhigh—purity(thebothcouldreach99.90%)couldbeobtainedbythetwoseparationmethods,butthedoubleefec
6、tpressureswingdistillationcouldsaveenergyby29.65%inheatingprocessandby31.51%incoolingprocesscomparedwiththepressureswingdistillation.[Keywords]monoethanolamine;triethylenediamine;azeotrope;pressureswingdistillation;doubleefectpressureswingdistillation;energysaving三乙烯二胺(TEDA)主要用作生產(chǎn)聚氨酯
7、泡度164℃,共沸物質(zhì)量組成:MEA41.52%、TEDA沫塑料的催化劑,還可用于彈性體與塑料制品成58.48%。在工業(yè)化生產(chǎn)高純度TEDA產(chǎn)品的過程型工藝、乙烯聚合和環(huán)氧乙烷聚合催化劑等J。中,MEA和TEDA混合物的分離是一個(gè)難題。首近年來(lái),隨著聚氨酯泡沫塑料應(yīng)用范圍的日漸廣先,TEDA屬于易凝固物質(zhì),其凝固點(diǎn)158cC、沸泛,對(duì)其制備過程中使用的TEDA催化劑的需求大點(diǎn)l74,凝固點(diǎn)與沸點(diǎn)相差16℃,精餾操作彈性幅度增加。較小,并且在精餾過程中容易因TEDA凝固而堵塞中低壓法催化胺化合成乙撐胺工藝是有工業(yè)[收稿日期]2014—03—27;[修改稿日期]20
8、14—05—04?;熬?/p>