超重力精馏回收果胶沉淀溶剂的应用  

Application of higee distillation for pectin precipitation solvent recovery

作　　者：宋子彬[1,2] 栗秀萍[1,2] 刘有智[1,2] 李道明[1,2] 李宁[1,2] 

机构地区：[1]中北大学山西省超重力化工工程技术研究中心,山西太原030051 [2]超重力化工过程山西省重点实验室,山西太原030051

出　　处：《化工进展》2015年第4期1165-1170,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21376229);山西省科技攻关计划(工业)(20130321035-02)项目

摘　　要：同时应用超重力精馏连续与间歇操作分离回收果胶沉淀溶剂中的乙醇,并以不锈钢波纹丝网为填料,在原料乙醇质量分数xf=55%、回流比R=4、超重力因子β=63.16~252.67、原料流量F=15~50L/h、1.01×105Pa和室温进料下操作,研究了四级超重机在连续精馏过程中的传质性能;并在β=161.71、R=2.5~7及1.01×105Pa操作条件下,考察了间歇精馏过程中不同回流比R对塔顶和塔底乙醇浓度xd和xw的影响。结果表明,在连续精馏过程中,理论塔板数NT随β和F的增大而增加,设备的等板高度HETP为41.12~58.21mm,xd=93%,xw=35%;在间歇精馏过程中,xd随着R的增大先增高后降低,xw随着R和t的增大而下降,所得产品xd为92.5%,xw为1.05%;乙醇分离回收效果良好,回收率为91.28%,单位回收乙醇产品成本为0.644元/L,充分表现出超重力精馏工艺应用于果胶沉淀溶剂的回收再利用的优势。The continuous and intermittent processes of higee distillation separation were used in recycling ethanol in the solvent of pectin precipitation at the same time. With stainless steel wave thread packing,mass transfer of four-stage higee distillation continuous process was studied,under the conditions of atmospheric pressure and ambient temperature,feedstock mass fractionxf of 55%, reflux ratioR of 4,average high gravity factorβ of 63.16—252.67,feedstock flux F of 15—50 L/h. Different operating conditions impacting on the tower top ethanol mass fractionxd and tower bottom ethanol mass fractionxw were also studied in the four-stage higee distillation batch process,under the conditions of atmospheric pressure,R of 2.5—7,β of 161.71. Under the operation of continuous process,the number of theoretical plateNT of four-stage higee distillation equipment increased with increasingβ andF; the height equivalent of theoretical plateHETP was 41.12—58.21mm;xd was 93% andxw was 35%. Under the operation of batch process,xd increased first then decreased with increasingR,whilexw decrease withR and t;xd is 92.5% andxw is 1.05%. The separation effect of Ethanol recycling is good,and recovery rate was 91.28%. The cost of unit ethanol recovery was 0.644 yuan/L,showing advantage of higee distillation in recycling ethanol in the solvent of pectin precipitation.

关 键 词：超重力 精馏 乙醇-水 溶剂回收 

分 类 号：TQ09[化学工程]