A new process of extraction distillation with salt was developed for the triple azeotropic system of methyl acetate - ethanol - water and the selective method of the solvent and salt were studied 本文针对乙酸甲酯?乙醇?水三元共沸体系，提出了加盐萃取精馏的工艺过程，并对盐的选择和萃取剂的选择方法进行了研究。
A liquid mixture of two or more substances that retains the same composition in the vapor state as in the liquid state when distilled or partially evaporated under a certain pressure 共沸混合物两种或多种物质组成的液体混合物，当在某种压力下被蒸馏或局部汽化时，在气体状态下和在液体状态下保留相同的物质的成分
When reacting with acid splitting products neutracid develops always a new active surface , that means constant efficiency . besides neutracid stops through its granulated structure uncontrolled boiling problems 和酸性物质反应后，除酸剂又会生成一种新的表面活性，意味着长期有效。另外， neutracid的分散体结构可阻止产生共沸现象。
Application of the combined experiment design method to ethanol - water system has shown it ' s able to use for determination of the appropriate conditions for salt effect in extractive distillation with salt of binary close boiling or azeotropic mixtures 联合试验设计法在乙醇-水体系的应用表明：该法可用于二元共沸、近沸体系的加盐萃取精馏过程中盐效应适宜条件的确定。
For heterogeneous azeotropic distillations , three phases , one vapour phase and two liquid phases , can coexist . the existence of the second liquid phase could change the hydrodynamic behaviour and therefore influence the separation efficiency 对三相共沸精馏过程而言，一个汽相和两个液相形成汽液液三相共存现象，第二个液相会或多或少地改变精馏过程的流体力学特性并最终影响过程的传质分离效率。
A new method on extraction of phenanthrene from crude anthraceneis given , which includes azeotropic dissolution with ethylene glycol , extraction of carbon tetrachloride , treatment of sulfuric acid and ethyl alcohol recrystallization , in the end , the best process is obtained 研究了从粗蒽中提取菲的方法，即用乙二醇对原料进行共沸，以四氯化碳为溶剂并用硫酸处理，最后用无水乙醇重结晶，制定出最佳的工艺路线
Abstract : a new method on extraction of phenanthrene from crude anthraceneis given , which includes azeotropic dissolution with ethylene glycol , extraction of carbon tetrachloride , treatment of sulfuric acid and ethyl alcohol recrystallization , in the end , the best process is obtained 文摘:研究了从粗蒽中提取菲的方法，即用乙二醇对原料进行共沸，以四氯化碳为溶剂并用硫酸处理，最后用无水乙醇重结晶，制定出最佳的工艺路线
The azeotropic distillation of the system acetic acid - water - azeotropic agent ( isopropyl acetate and butyl acetate ) is simulated . due to the non - ideal behavior , nrtl - hoc and uniquac - hoc model is used to depict vapor - liquid phase equilibrium behavior of this system . concerning the liquid in the decanter , the stability is checked by tangent plane stability analysis , and the initialization of phase splitting calculation is produced . a good estimate of the phase fration is gotten by successive substitution with newton ' s method , and every component of two phase is gotten by mass equilibrium equation . finally , the solution of this equation is produced with successive substitution calcultion . the naphtali - sandholm method is used to simulation of azeotropic distillation . by virtue of this combined calculation method , the simulation is begun with operational data as basical data . the results of simulation accord with the operating data , which proved that the combined calculation method is credible 该体系具有高度非理想性，气液相平衡模型采用nrtl - hoc和uniquac - hoc模型，采用切平面判据法对进入分层器中的液相进行液相稳定性测试，提供液液相分离计算的初值，再结合牛顿拉夫森迭代法运算求得相分割系数，根据物料衡算求出各相组成，循环迭代可求得分层各组分数据，共沸精馏模拟计算采用那夫塔列-山德荷姆全变量迭代算法。
Thome correlation has good precison in calculating heat transfer coefficients of r404a inside horizontal microfin tube . 3 . the analyses on different empirical formulations of in - tube boiling heat transfer coefficients indicate that r404a can be treated as pure refrigerant during calculating its the in - tube boiling heat transfer coefficients 对近共沸混合工质r404a ，通过对光管和内螺纹管沸腾换热系数关联式的分析计算得出结论：在计算r404a的光管和内螺纹管沸腾换热系数时可以被作为纯质来处理。
The demand of protecting the ozone layer , saving energy and improving room comfort is a developmental trend to air source heat pump system in recent years . composition modulation is one form of capacity controls , which changes system capacity by varying composition of nonazeotropic mixtures 环保、节能、舒适性是当今空气源热泵系统发展所追求的方向，而混合工质容量调节是利用非共沸混合工质的组成特性，通过改变系统中混合工质的浓度来调节系统容量的一种调节方式。
