Rigorous Batch Vaporization / Solvent Switch

General Description

This unit operation model simulates batch evaporation in a stirred vessel by employing formal VLE models for the determination of the physical state of the vessel contents. The operation is dynamic in the sense that it captures the time evolution of the vessel contents until a specified vaporization target is achieved.

This operation is different than Batch Vaporization / Solvent Switch

Unit Procedure Availability

      Batch Vessel Procedure in a Reactor

      Batch Vessel Procedure in a Seed Reactor

      Batch Vessel Procedure in a Bioreactor

      Batch Vessel Procedure in a Seed Bioreactor

      Batch Vessel Procedure in a Disposable Bioreactor

      Batch Vessel Procedure in a Disposable Seed Bioreactor

      Batch Vessel Procedure in a Fermentor

      Batch Vessel Procedure in a Seed Fermentor

      Batch Vessel Procedure in a Disposable Bioreactor

      Inoculum Preparation Procedure in a Rocking Bioreactor

      Inoculum Preparation Procedure in a Roller Bottle

      Inoculum Preparation Procedure in a T-Flask

      Inoculum Preparation Procedure in a Shake Flask

      Inoculum Preparation Procedure in a Test Tube

      Batch 3x3 Generic Box Procedure

      Batch 5x5 Generic Box Procedure

      Batch 10x10 Generic Box Procedure

Rigorous Batch Vaporization: Modeling Calculations

Material Balances

The user must initially identify the problem to be solved by selecting an operating mode (i.e., concentrate or solvent switch) and a vaporization target (i.e., a specification for the vessel contents at the end of the operation). In the Concentration mode, one of the following vaporization targets can be specified: (a) final molar percentage volume, (b) final volumetric percentage, (c) final liquid volume, or (d) final amount of a key component, either as molar percentage or mass concentration. In the Solvent Switch Mode, the user can specify either (a) the final amount of the key component or (b) the total amount of solvent to be added in the vessel. In the latter case, the program assumes that the solvent is uniformly added to the vessel i.e., an equal amount of solvent is added at every time step throughout the duration of the vaporization.

Energy Balances

The heating requirements of the operation are calculated under the assumption of a constant heating rate. This constant heating rate is initially applied to the vessel contents until their temperature reaches the bubble point of the mixture. Subsequently, the vaporization of the liquid contents begins until the specified vaporization target is achieved. The program calculates the average vaporization rate throughout the course of the operation.

Evaporation Time

The vaporization time is either specified by the user or calculated by the program, given a constant heating rate. Notice that when the solvent amount is specified in the case of Solvent Switch Mode, the heating rate cannot be specified by the user and is always calculated by the program.

Equipment Sizing

See Batch Vessel Operations: Equipment Sizing.

Vacuum Pump Power Consumption

See Vacuum Pump Auxiliary Equipment Calculations.

References

1.   McCabe W. L., J. C. Smith, and P. Harriott. (1993). Unit Operations of Chemical Engineering, McGraw-Hill.

2.   Kern D. Q (1965). Process Heat Transfer, McGraw-Hill.

3.   Coulson J. M. and J. F. Richardson, (1978). Chemical Engineering, 2, Pergamon Press.

Rigorous Batch Vaporization: Interface

The interface of this operation has the following tabs:

      Oper. Cond’s, see Rigorous Batch Vaporization: Oper. Conds Tab

      Volumes, see Batch Vessel Operations: Volumes Tab

      Rigorous Toolbox, see Flash Evaporation: Toolbox Options Tab

      Profiles, see Rigorous batch vaporization: Profiles Tab

      Labor, etc, see Operations Dialog: Labor etc. Tab

      Description, see Operations Dialog: Description Tab

      Batch Sheet, see Operations Dialog: Batch Sheet Tab

      Scheduling, see Operations Dialog: Scheduling Tab