ASPEN conventional vapor/liquid

In addition to handling the conventional vapor/liquid process operations, the ASPEN library of process models includes solids handling and separation units, a set of generalized reactors, improved flash and distillation unit models and process models from the FLOWTRAN simulator. The user can also include his or her own model or key elements of a model, such as the reaction kinetics, in FORTRAN code. 

Because ASPEN is to be used with coal conversion processes, its streams can be designated to carry an arbitrary number of solids or solid phases. This is done by specifying any number of substreams. In fact, the conventional vapor/liquid stream is normally assumed as a substream and solids can comprise other substreams. For the conventional vapor/liquid substream, process data is carried on component molar flows, total molar flow, temperature pressure, specific enthalpy, specific entropy, density, molar vapor fraction, molar liquid fraction, and molecular weight. For solid substreams, which are called "non-conventional substreams," the characterizing data is not as deterministic. The information associated with these substreams is called "attributes". Such attributes may be particle size distribution, ultimate and proximate analyses, or other material specific information. Another type of substream is an "informa-... 

Ambient pressure = 1 bar. Valid phases = Vapor - liquid, and Free water = No. When happy with this page, click on the Next button. The next page lets you select the conponents. First, pick a binary mixture of interest (use ethanol and water). Component ID is whatever you want to call it. Type should be conventional. Then click on the conponent name box or hit ENTER. If you used ethanol and water as the conponent IDs, Aspen will conplete that row. If you used a different ID, such as E or W, give the appropriate conponent name (ethanol or water). Then do the next conponent. Aspen Plus will recognize these two conponents. If Aspen Plus does not fill in the formula, click on the Find button and proceed. When done with conponents, click on Next. Note that Aspen Plus can be piclg about the names or the way you write formulas. Note If you use W as conponent ID, Aspen will think this is tungsten. Type water as conponent name instead. 

It is believed that ASPEN provides a state-of-the-art capability for thermodynamic properties of conventional components. A number of equation-of-state (EOS) models are supplied to handle virtually any mixture over a wide range of temperatures and pressures. The equation-of-state models are programmed to give any subset of the properties of molar density, residual enthalpy, residual free energy, and the fugacity coefficient vector (and temperature derivatives) for a liquid or vapor mixture. The EOS models (named in tribute to the authors of such work) made available in ASPEN are the following ... 

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See also in sourсe #XX -- [ ]

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