化学工程
化學工程
화학공정
CHEMICAL ENGINEERING
2014年
6期
69-73
,共5页
甲缩醛%Aspen Plus模拟%双效精馏
甲縮醛%Aspen Plus模擬%雙效精餾
갑축철%Aspen Plus모의%쌍효정류
methylal%Aspen Plus simulation%double-effect distillation
甲缩醛法制甲醛过程中，在精馏浓缩甲缩醛时，容易形成甲醇-甲缩醛共沸体系，不易得到高纯度的甲缩醛。通过研究分析可知甲醇-甲缩醛的共沸组成随压力的变化而变化，因此现有的很多工艺均采用变压精馏分离甲缩醛。其缺点是能耗高、效率低，能量的损失较大。为了进一步提高甲缩醛精馏塔的效率，在变压精馏的基础上运用双效精馏的方法来改进甲缩醛分离提纯工艺。模拟结果，甲缩醛精馏塔为：27块理论板，压力为1000 kPa，双效精馏过程中塔底再沸器和塔顶冷凝器的节能率分别为54．97％和37．79％。
甲縮醛法製甲醛過程中，在精餾濃縮甲縮醛時，容易形成甲醇-甲縮醛共沸體繫，不易得到高純度的甲縮醛。通過研究分析可知甲醇-甲縮醛的共沸組成隨壓力的變化而變化，因此現有的很多工藝均採用變壓精餾分離甲縮醛。其缺點是能耗高、效率低，能量的損失較大。為瞭進一步提高甲縮醛精餾塔的效率，在變壓精餾的基礎上運用雙效精餾的方法來改進甲縮醛分離提純工藝。模擬結果，甲縮醛精餾塔為：27塊理論闆，壓力為1000 kPa，雙效精餾過程中塔底再沸器和塔頂冷凝器的節能率分彆為54．97％和37．79％。
갑축철법제갑철과정중，재정류농축갑축철시，용역형성갑순-갑축철공비체계，불역득도고순도적갑축철。통과연구분석가지갑순-갑축철적공비조성수압력적변화이변화，인차현유적흔다공예균채용변압정류분리갑축철。기결점시능모고、효솔저，능량적손실교대。위료진일보제고갑축철정류탑적효솔，재변압정류적기출상운용쌍효정류적방법래개진갑축철분리제순공예。모의결과，갑축철정류탑위：27괴이론판，압력위1000 kPa，쌍효정류과정중탑저재비기화탑정냉응기적절능솔분별위54．97％화37．79％。
In the process of manufacturing highly-concentrated aqueous formaldehyde solution by methylal oxidation, when concentrated methylal is distillated,it is easy to form a methanol-methylal azeotropic system,and difficult to obtain high-purity methylal.The methanol-methylal azeotropic composition changes with pressure,thus many existing processes use swing-pressure distillation (using high-pressure column)to separate methylal.There are many disadvantages,such as high energy consumption and low efficiency,which result in great energy loss.To improve the efficiency of the tower,the process of separating methylal was improved by combining swing-pressure distillation with double-effect distillation.The simulation results are as follows:the high pressure column is built up by 27 theoretical plates,the pressure is 1 000 kPa,the energy saving rates of the bottom reboiler in the double-effect distillation process is 54.97%,and the energy saving rates of the overhead condenser is 37.79%.
