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About This Club

This club is to who aspire to learn about aspen process simulation tecniques in chemical enggineering.

Club Type

Engineering Software
  1. What's new in this club
  2. Arun Gupta


    im stuck in one question , can anyone help me out ??? Problem Description Normal butane, C4H10, is to be isomerized to isobutane in a plug-flow reactor. This elementary reversible reaction is to be carried out adiabatically in the liquid phase under high pressure using a liquid catalyst which gives a specific reaction rate of 31.1 h-1 at 360 K. The feed enters at 330 K. Calculate the PFR volume necessary to process 100,000 gal/day (160 kmol/h) at 70% conversion of a mixture 90 mol % n-butane and 10 mol % of i-pentane, which is considered an inert. Plot and analyze X, Xe, T and -rA down the length of the reactor Calculate the CSTR volume for the same conditions as the PFR
  3. Munsif Ahmed


    Where can I get the ASPEN software so that I can learn and implement it
  4. Prudhvi nadh


    The HYSYS user interface is horrid when compared with other simulators. AspenTech has a very large market share,its all about marketting and market share, not capabilities of them,despite the fact that (in the case of HYSYS, in my opinion) is user friendly.Aspen plus "looks" nicer, but that's about it. I think they both use the same thermo; version 7.1 of Aspen's suite of tools allows HYSYS to start using the property packages from Aspen Plus. So as far as accuracy goes, you're *probably* going to get the same answers out of both programs. Aspen Plus has solids handling capabilities in it, I believe, and it has an "automatic recycle" capability whereas in HYSYS you have to add them manually. Some like that, some don't.What I've seen is persons get used to one simulator, and because of familiarity, that's what they stick with, even if someone shows up with a "better" product, that's cheaper, faster, w/'s not so much cost,as it is,"this is what we were used". Aspen Plus evolved as a chemical process simulator - it is very strong for simulating non-ideal properties, systems with electrolytes, solids, azeotropes, and chemical reactions. It is also strong for modeling large-scale flowsheets (using the equation-orieted approach).HYSYS is optimized for upstream oil & gas, gas processing, and refining applications. It has a good workflow centered around 'forward-backward' solving. Hysys is meant for the petrochemical industry, it has better support for things like Assays and has built in refinery reactors, like FCC's and catalytic reformers. Aspen Plus is more general purpose with great electrolyte support and solids and polymer support. It is geared more towards capturing general phenomena and allowing you to describe your process at a more fundamental level, such as with rate-based separation, although the new Acid Gas package in Hysys uses a rate based column. In Aspen Plus it will look at the topology of your flowsheet and guess which stream(s) to tear. You can go into the convergence folder, and choose a different stream to tear and set the change the tolerance and convergence algorithm and the threshold for a trace component (will not be included in the error calculation) which is useful for tearing streams with very low concentrations of some reactant that is basically at the level of numerical noise. Aspen Plus also has an equation oriented mode which makes it MUCH easier to converge especially tricky recycles once you get it close in SM mode. It also is useful for doing optimization. The decisions you make when using either of these tools is much more important than the particular differences between either of them.
  5. Prudhvi nadh

    Aspen plus

    Introduction Engineers are constantly being called upon to predict the behavior of systems. Chemical engineers in particular must be able to predict the actions of chemical species, a very difficult task. As chemical engineering students, when confronted with a large chemical system, you might ask, "Where do I even begin? Mass balances? Energy balances? Thermodynamic properties? Reaction Kinetics?" Over the past few years as a student you've learned about each of these crucial topics separately, however, "real world" situations will require an engineer to incorporate all of these areas. This is where the idea of a process model is helpful. A process model can be defined as an engineering system's "blue print." The process model is a complete layout of the engineering system including the following: FlowsheetThe process model flowsheet maps out the entire system. The flowsheet shows one or more inlet streams entering into the system's first unit operation (i.e., heat exchanger, compressor, reactor, distillation column, etc.) and continues through the process, illustrating all intermediate unit operations and the interconnecting streams. The flowsheet also indicates all product streams. Each stream and unit operation is labeled and identified. Chemical ComponentsThe process model specifies all chemical components of the system from the necessary reactants and products, to steam and cooling water. Operating ConditionsAll unit operations in the process model are kept under particular operating conditions (i.e., temperature, pressure, size). These are usually at the discretion of the engineer, for it is the operating conditions of the process that effect the outcome of the system. Sound confusing? Well can you imagine keeping track of all of this by hand, then solving all the mass and energy balances, determining thermodynamic behavior, and using reaction kinetics just to determine what size reactor to use, or how much product you'll achieve? ASPEN PLUSTM allows you to create your own process model, starting with the flowsheet, then specifying the chemical components and operating conditions. ASPEN PLUSTM will take all of your specifications and, with a click of the mouse button, simulate the model. The process simulation is the action that executes all necessary calculations needed to solve the outcome of the system, hence predicting its behavior. When the calculations are complete, ASPEN PLUSTM lists the results, stream by stream and unit by unit, so you can observe what happened to the chemical species of your process model.
  6. Arun Gupta


    what is basic difference b/w ASPEN + and ASPEN HYSYS ??
  7. Arun Gupta


    Aspen Plus is the market-leading chemical process optimization software used by the bulk, fine, specialty, & biochemical industries, as well as the polymers industry for the design, operation, and optimization of safe, profitable manufacturing facilities.