Continuous Stirred Tank Reactor - English

Questions posted on ST Forums:

• My results of simulation doesn't match.

  Sir, I've performed the entire simulation as per tutorial but the conversion of Ethanol and Acetic acid is showing 0.395404 and 0.379588 respectively. I've run the simulation many times by watching the tutorial but the results doesn't match.

  09-10M 40-50S rauttanmay9977@gmail.com
  
  
  Answer last updated on: March 22, 2025, 4:50 a.m.

  ---

• Getting Wrong Results

  I am using DWSIM version 8. I have followed the exact steps as mentioned in the tutorial. The CSTR gets simulated successfully but the results are totally different. In Compound conversions, only the acetic acid conversion is being displayed and its value is 1.86E-14 % as opposed to >90 % in the tutorial. Also the heat load is not being displayed.

  09-10M 0-10S aksrathod25@icloud.com
  
  
  Answer last updated on: March 22, 2025, 4:49 a.m.

  ---

• Error in CSTR

  When the simulating the CSTR, error is generated in calculation mode so that i cannot obtain the desired conversion through this CSTR simulation. CSTR.dwxmz

  09-10M 20-30S Bharkhada_Priyesh
  
  
  Answer last updated on: May 24, 2024, 4:25 p.m.

  ---

• Error in CSTR

  When i am calculate for CSTR i given value of isothermic in calculation mode and i have facing the error in calculation and i did not getting the conversion and i have follow every steps as you tough me in tutorial and my DWSIM version is 8 in windows 11.

  08-09M 30-40S Bharkhada_Priyesh
  
  
  Answer last updated on: May 24, 2024, 4:04 p.m.

  ---

• Conversion percentage doesn't match with the tutorial

  The residence time obtained match with that of tutorial whereas the conversion percentage attained is 65.8% and 63.2%  for ethanol and acetic acid respectively (that too by changing the velocity units to kmol/m3s.(version installed is 6.4.3).Kindly help

  00-01M 0-10S vidyavijayev
  
  
  Answer last updated on: Jan. 19, 2023, 12:03 p.m.

  ---

• Error of name for assignment question of tutorial(CSTR)

  Drive link:https://drive.google.com/file/d/117US25tw_eUSA0rlgzCYXkUX8oPYabal/view?usp=sharingThis error was raised during the calculation of a Unit Operation or Material Stream.System.NullReferenceException: Object reference not set to an instance of an object.   at DWSIM.SharedClasses.SystemsOfUnits.Converter.ConvertToSI(String units, Double value) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.SharedClasses\UnitsOfMeasure\SystemsOfUnits.vb:line 1184   at DWSIM.UnitOperations.Reactors.Reactor_CSTR.NewCalculate(Object args) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.UnitOperations\Reactors\CSTR.vb:line 701   at DWSIM.SharedClasses.UnitOperations.BaseClass.Solve() in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.SharedClasses\BaseClass\SimulationObjectBaseClasses.vb:line 442   at DWSIM.FlowsheetSolver.FlowsheetSolver.CalculateObjectAsync(Object fobj, CalculationArgs objArgs, CancellationToken ct) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.FlowsheetSolver\FlowsheetSolver.vb:line 223   at DWSIM.FlowsheetSolver.FlowsheetSolver.ProcessQueueInternalAsync(Object fobj, CancellationToken ct) in C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.FlowsheetSolver\FlowsheetSolver.vb:line 520Location:Code Location: ConvertToSI (file 'C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.SharedClasses\UnitsOfMeasure\SystemsOfUnits.vb', line 1184)Calling Method: NewCalculate (file 'C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.UnitOperations\Reactors\CSTR.vb', line 701)Check input parameters. If this error keeps occurring, try another Property Package and/or Flash Algorithm.

  07-08M 10-20S virat282003
  
  
  Answer last updated on: June 28, 2022, 4:54 p.m.

  ---

• Improper conversion Value

  I use DWSIM version 6: The conversion value I got for synthesis of Ethyl Acetate in a CSTR are Ethanol - 0.395 & Acetic acid - 0.379. i checked every value and steps shown in the tutorial and everything is the same. Every time the value has some difference than the value in tutorial, I understand it is because of versions. But, this low conversion is not accepted. Kindly help me with this.

  01-02M 20-30S Deena_S
  
  
  Answer last updated on: July 7, 2021, 12:05 p.m.

  ---

• ERROR : No reactor headspace defined

  When i run the simulation it shows error, no reactor headspace defined. Their is no data about headspace in problem statement.

  09-10M 20-30S ajaysengar143@gmail.com
  
  
  Answer last updated on: June 29, 2021, 11:40 a.m.

  ---

• Material Stream status: not calculated

  Material stream status shows "not calculated". 

  02-03M 10-20S ajaysengar143@gmail.com
  
  
  Answer last updated on: June 21, 2021, 12:25 p.m.

  ---

• Feed Error

  After selecting the units and when I add feed it shows NRTL Error: Missing interaction parameters for binary pair acetic acid/ethanol.

  03-04M 0-10S sony___antony
  
  
  Answer last updated on: June 10, 2021, 7:38 p.m.

  ---

• regarding heat load of the CSTR

  I am getting the heat load of the CSTR ( in results) as -5.68434E-13.and outlet temperature in the CSTR property editor as 70 C while here in spoken tutorials it is showing as 25C.

  09-10M 30-40S praveen3402
  
  
  Answer last updated on: June 8, 2021, 4:30 p.m.

  ---

• Conversion is way off. Getting 65% and 63% as opposed to >90 values as shown in tutorial

  The conversion is way off. Attaching the simulation file. https://drive.google.com/file/d/16DSJ-Ps7f5_kmq5gc6eyVhutsj2erBvH/view?usp=sharing

  09-10M 40-50S sroyonline
  
  
  Answer last updated on: April 26, 2021, 11:19 a.m.

  ---

• HEAT LOAD

  Hello,I'm not getting heat load correctly in result section as per the tutorial results,i try so many times but getting heat load -32.0258KW

  12-13M 10-20S Achal_07
  
  
  Answer last updated on: March 24, 2021, 11:52 a.m.

  ---

• Heat Load

  I followed the same procedure and the heat load estimation is different in my simulation. Do you know why it is happened? Thanks

  12-13M 10-20S cabreramiguelangel
  
  
  Answer last updated on: Feb. 19, 2021, 2:13 p.m.

  ---

• CSTR

  I am following the exact same steps as shown in tutorial but when I solve flowsheet, I am getting 2 errors Maximum number of iterations reachedErrors occurred during the calculation of the flowsheet, please read the following messages for more details.

  09-10M 0-10S Elvin
  
  
  Answer last updated on: Feb. 17, 2021, 9:19 a.m.

  ---

• Kinetics of the reaction not found.

  I am using NRTL package with nested loop for the calculation of molar flow and residence time of reaction between CaO and HNO3. I have added the materials using pubchem data in form of joson file. When I am preparing the flowsheet, no error is indicating in error panel but  when I am solving the flowsheet it is showing kinetics of reaction not found. What I can do to solve this issue?*While making the compound, no data related to kinetics have been asked*

  09-10M 20-30S shikharranjan
  
  
  Answer last updated on: Feb. 17, 2021, 9:19 a.m.

  ---

• Getting Error when solving flowsheet

  I am following the exact same steps as shown in tutorial but when I solve flowsheet, I am getting 2 errors Maximum number of iterations reachedErrors occurred during the calculation of the flowsheet, please read the following messages for more details.I am using DWSIM version 6.2

  09-10M 30-40S mruthyunjayram
  
  
  Answer last updated on: Oct. 12, 2020, 5:14 p.m.

  ---

• Cannot locate New Steady-state Simulation under File Menu in DWSIM Version 6.1 Update 1

  I am unable to find "New Steady-state simulation" option under File Menu as displayed in the tutorial. I am using DWSIM Version 6.1 Update 1.

  01-02M 30-40S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 2:14 p.m.

  ---

• Volumetric flow value is different on my interface

  In Video: Volumetric Flow rate is 4.16 m3/hOn my interface, it is 4.1095 m3/h.  I am using DWSIM Version 6.1 Update 1

  03-04M 40-50S kaushikdatta
  
  
  Answer last updated on: Aug. 28, 2020, 2:12 p.m.

  ---

• Unable to locate Continuous Stirred Tank Reactor under Unit Operations in DWSIM Version 6.1 Update 1

  I am unable to locate the Continuous Stirred Tank Reactor under Unit Operations. I am using DWSIM Version 6.1 Update 1

  07-08M 30-40S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 11:53 a.m.

  ---

• Which option to select between Arrehenius and User-Defined to enter A=0.004 in DWSIM Version 6.1 Update 1

  In the Direct Reaction, there are two options as Arrehenius and User-Defined. For which should A=0.004 be entered?. I am using DWSIM Version 6.1 Update 1

  07-08M 10-20S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 11:44 a.m.

  ---

• I am unable to find any green tick button to Accept changes in DWSIM Version 6.1 Update 1

  I am unable to find any green tick button to Accept changes. I am using DWSIM Version 6.1 Update 1

  04-05M 20-30S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 11:38 a.m.

  ---

• Cannot find Composition option to enter the Basis as Mole Fraction in DWSIM Version 6.1 Update 1

  I am unable to locate the Composition option to enter the Basis as Mole Fraction. I am using DWSIM Version 6.1 Update 1

  03-04M 50-60S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 11:36 a.m.

  ---

• Unable to locate the Object Palette in DWSIM Version 6.1 Update 1

  I am unable to locate Object Pallete to add the material stream. I am using DWSIM Version 6.1 Update 1

  02-03M 50-60S priyamnayak
  
  
  Answer last updated on: Aug. 28, 2020, 11:27 a.m.

  ---

• error during checking the conversion

  while checking the conversion after solving the flow sheet..I saw the conversion of water as 2390.06%..is there any error while solving flowswheet

  08-09M 30-40S Navyanirmala
  
  
  Answer last updated on: Aug. 12, 2020, 7:45 a.m.

  ---

• Tmin & Tmax select

  how to know the   Tmin And Tmax  range vaild for the  define rate constant ?1) Repeat this simulation with different compounds and thermodynamics Compounds: Methyl Acetate, 1-Butanol, Methanol, N-Butyl Acetate Property Package: Raoult's Law 2) Repeat this simulation with different feed conditions Inlet stream: Mass Flow: 3600kg/h Mole Fraction(CH3OH): 0.1 Mole Fraction(C4H9OH): 0.45 Mole Fraction(CH3COOCH3): 0.45 Temperature: 75 degree C Pressure: 5 bar 3) Repeat this simulation with different CSTR dimensions and reaction kinetics CSTR Dimensions: Volume: 4 m3 Reaction rate: rA = KCACB K = 0.01 , n = 2

  07-08M 0-10S Anupa854
  
  
  Answer last updated on: May 10, 2020, 1:50 p.m.

  ---

• Tmin and Tmax

  How to set up the range for Tmin and Tmax? Are there any rules upon selecting the range?

  07-08M 0-10S fariasultana3208@gmail.com
  
  
  Answer last updated on: March 29, 2020, 6:24 p.m.

  ---

• Mentioning the order of the reaction

  Dear Sir /Madam,I) How can I specify the reaction order to be 2 . Should I just specify the DO of the reactants i.e.Ethanol and Acetic acid to be 2 ?ii) The question specified only the value of 'rate constant' and how can we enter it as 'frequency factor' In the Arrhenius equation

  11-12M 50-60S HaareshAugustus
  
  
  Answer last updated on: Feb. 28, 2018, 4:42 p.m.

  ---