Discussion

Started 6th May, 2022

Monash University (Australia)

Production cost (OPEX) estimation of a chemical process plant

To estimate the production costs of the chemical process plant, these are the preliminary estimated data. This helps the process engineer to make a decision among the alternatives.

What do you think?

Production cost estimati
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Chemical Processes

Process Engineering

Thinking

Shuwana Tasleem

SAI Life Sciences Ltd

Its really serves as a good first estimate

Cite

1 Recommendation

Orlando M Lourenço

University of Lisbon

Nidhal Kamel Taha El-Omari

The World Islamic Science and Education University (WISE)

Chuck A Arize

Texas A&M University-Commerce

Yoganandan G

Periyar University

Umar Ashraf

Yunnan University

Determining the functional unit and applying the concept of avoided products

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Asked 29th Apr, 2024

Rendra Hakim Hafyan

Can we use input (for example, biomass) as a functional unit and truly ensure that all products produced are avoided products?

Polymers pyrolysis using "PYROLYSIS REACTION"?

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Asked 4th Apr, 2024

Davide Sorino

Hello everyone, I am trying to use the new type of reaction present in Aspen plus V14, known as "pyrolysis."

I have tried to simulate pyrolysis of HDPE, by entering the kinetics suggested by Aspen plus Help, but still I always encounter errors, or if the program runs, I get in output products with a yield in the order of 10^(-30).

In particular, once I get the reaction going, the following errors I encounter:

****PROPERTY PARAMETER ERROR ERRORS ENCOUNTERED IN CALCULATION OF VAPOR-LIQUID K-VALUES USING OPTION SET POLYNRTL FOR KVL.

** ERROR

RPLUG EXITED BECAUSE INTEGRATION FAILED. INDEX = (-9)

PROBABLE CAUSE IS INCORRECT KINETICS. CHECK RATE-CON

PARAMETERS AND MOLAR VOLUME CALCULATIONS.

Thank you in advance for your response.

What is CEPCI (Chemical Engineering Plant Cost Index) value for 2022?

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5 answers

Asked 4th May, 2023

Han Zhang

What is CEPCI (Chemical Engineering Plant Cost Index) value for 2022?

How to make deep eutectic solvent mixture of choline chloride and ethylene glycol in 1:2 molar ratio ? what ammount of both chemical has to be taken?

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8 answers

Asked 28th Mar, 2023

Rajni Kumari

For making Deep eutectic solvent of choline chloride and ethylene glycol in 1:2 molar ratio how much quantity of cholin chloride and ethylene glycol has to be taken ?

How to calculate cellulose, hemicellulose, and lignin content via ultimate analysis?

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Asked 19th Jan, 2023

Park Sunyong

I need a help for atomic balance

I read a paper which named [The effect of the biomass components lignin, cellulose and hemicellulose on TGA and fixed bed pyrolysis]

doi: (https://doi.org/10.1016/j.jaap.2013.01.012)

Results of ultimate analysis are as follows:

C: 46.43

H: 6.21

O: 42.19

unit: [wt%]

cellulose, hemicellulose and lignin are defined as follows:

Cellulose: C6H10O5

Hemicellulose: C5H10O5

Lignin: C10H12O3

I cannot calculate those three component using atomic balance.

Could someone help me how to calculate them?

The results of calculation are as follows:

Cellulose: 42%

Hemicellulose: 27%

Lignin: 26%

Please, someone explain me.

How to solve the convergence problem about tutorial example in Aspen plus?

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2 answers

Asked 23rd Dec, 2022

Quan Zhou

Recently i wanted to use aspen plus to simulate fixed-bed gasification and i tried to test the example of the Aspen_Plus_Model_for_Moving_Bed_Coal_Gasifier included in the installation package. The iterative calculation method remains unchanged, and it can converge quickly according to the default working conditions. However, after modifying the working conditions, such as reducing the amount of water vapor in the inlet, convergence is difficult to succeed. Attempts to modify the iterative calculation method and reduce the residual convergence criterion were unsuccessful. May I ask what is the solution for the problem? Thanks a lot!

Vapor Pressure Model Pl0Xant Has Missing Parameters ?

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2 answers

Asked 26th Sep, 2022

Arun Teja Doppalapudi

Dear team,

I am converting triglycerides to FAME and has taken triglyceride TAG-PPO (C53H100O6) from the ASPEN biodiesel database.

I have given the reactions (1). Triglycerides--> Diglycerides ,(2). DG--> MG, & (3). MG-->FAME + glycerol along with the reversible reactions.

I have given the vapour -liquid-liquid as the valid phases for the RCSTR reactor and NRTL method was selected.

Though I have used all the components data from the ASPEN database, I am getting the following errors

->Calculations begin ...

VAPOR PRESSURE MODEL PL0XANT HAS MISSING PARAMETERS:

PLXANT/1ST ELEMENT (DATA SET 1) MISSING FOR COMPONENT TAG-PPO

****PROPERTY PARAMETER ERROR

ERRORS ENCOUNTERED IN CALCULATION OF VAPOR-LIQUID K-VALUES USING

OPTION SET NRTL FOR KVL.

! Calculations stopped because of missing property parameters

Can you please help me resolve the issue?

Thank you for the consideration

Kind regards

Arun

How to deal with sensible kinetic in Aspen Plus?

Question

3 answers

Asked 30th Mar, 2022

Asya Bornazzini

Hello! I have a problem with a reformer kinetic implemented in Aspen Plus. I have a PFR reactor that need to be closed with a recycle. In this recycle there is a very small amount of H2 that invalidate the kinetic and gives me error, this is because in the reaction rate expression, some terms are divided for the partial pressure of H2, and therefor being so small, is like dive everything for zero and that is causing problem in the converge.

Is anyone of you familiar with such problem? There is a way to "eliminate" a component from a stream is present below a certain amount?

Thank you

How to resolve Error of E-bal and M-bal in aspen plus?

Question

3 answers

Asked 9th Dec, 2021

Taimoor Khalid

I am simulating gasification of biomass in aspen plus using RCSTR but facing the following problem.

´´ THE E-BAL LOOP FAILED ON THE FIRST ITERATION BECAUSE THE M-BAL LOOP DID

NOT CONVERGE IN 50 ITERATIONS.´´

Can someone help me with this issue?

Thank you for your consideration.

Regards

Taimoor Khalid

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John M. Prausnitz

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Application of Numerical Methods in Chemical Process Engineering

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Numerical methods in chemical engineering deal with a broad range of problems starting from calculations on atomic or molecular level to the optimization of complete chemical plants. From an engineer’s point of view, we will expound the following subjects: quantum mechanical calculations of atoms and molecules numerical treatment of chemical reacti...

Laccase immobilisation on mesostructured silicas, authors: J. Bryjak, K. Szymańska, A.B. Jarzębski, Chemical & Process Engineering 2012, 33 (4), pp. 611-620

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