Chemical Process Simulation and Optimization with Aspen Plus Report

This report details the design and simulation of chemical processes using Aspen Plus, focusing on acid removal steps involving CO2 and H2S removal via the AntiSolvent Swing Regeneration method, separation of Natural Gas Liquids, and heavy hydrocarbons. It covers dehydration processes using Aspen HYSYS simulation, highlighting the importance of water removal to prevent corrosion, and explores cryogenic distillation for gas separation. The report also discusses the use of alkanolamine-based solvents for gas sweetening, detailing the chemical reactions involved in removing acid components and the process of glycol dehydration for natural gas drying. The document concludes with a process flow diagram illustrating the integration of various streams, including dry methane reforming, CO2, O2, coal, water, and air, in the chemical process.

Running head- CHEMICAL PROCESS ON ASPEN PLUS
CHEMICAL PROCESS ON ASPEN PLUS

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CHEMICAL PROCESS ON ASPEN PLUS
Table of Contents
Introduction-....................................................................................................................................3
Dehydration Process Using Aspen Hysis Simulation......................................................................3
Cryogenic Distillation Process........................................................................................................4
Conclusion-......................................................................................................................................6
References........................................................................................................................................6

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Introduction-
In order to design the chemical process based on Aspen Plus, the acid removal steps are
designed along with the reactions involved in removing the CO2 and H2S, using the Anti-
Solvent Swing Regeneration method, the Natural Gas Liquids along with heavy hydrocarbons
are also separated.
Dehydration Process Using Aspen Hysis Simulation
The dehydration method is a process used in chemical reaction to remove the water content from
the reaction. The water needs to be removed from the chemical processing of CO2 to avoid
corrosion. Sulphuric acid is a common agent used for chemical dehydration. There are different
methods used for dehydration, the most common method is the process of water condensing,
cooling and gas or water separation.
Procedure:
The most used process of removing the acid components is absorption in alkanolamine
based solvents. During the process, the components of the acid react with the absorption liquid of
alkanolamine, with the help of reversible followed by exothermic reaction in the gas contractor,
though liquid contactor is also used. During the steps of the reaction, the components of the acid
are removed from the solvent with the help of regenerator, which is generally at high temperature
or maybe at low temperature. The alkanolamines generally used are MEA (monoethanolamine),
DEA (diethanolamine), DIPA (diisopropanol amine) along with MDEA (N

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Methyldiethanolamine). In the case of gas involved in amine solvent for the sweetening of the
gas, the processes mainly involved are ASPEN and HYSYS (Parvez, Mujtaba, Hall, Lester &
Wu, 2016), based on process stimulation. Cryogenic distillation is used for the gas separation
process.
Cryogenic Distillation Process
Cryogenic distillation is a chemical technique used for the separation of gases from the air in the
reaction. This process is similar from other distillation processes except that here the temperature
used for boiling is low compared to other techniques. This process liquefies the gases to a very
cold temperature and then the components separated are distilled with their respective boiling
points.
The CID gases such as CO2, H2S and other components of the sulphuric are generally to some
extent present in natural gas as well as industrial gases. Since the gaseous streams are based on
the alkanolamine-based solvent. The reactions needed are as follows:
H S + Amine ⇔ Amine H + HS-(1)
CO2 + H2O + Amine ⇔ Amine COOH + OH (2)
+ − + + ⇔ + 3 4 CO2 H2O R2NCH3 R2NCH HCO (3)
Following the number (1) reaction H2S reacts the most along with amines with the help
of proton transfer. While in the case of number (2) CO2, reacts with secondary and primary
amines to form carbonate. In the case of MDEA, the H attached with N do not have any tertiary

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amine. the CO2 reaction happens after the CO2 dissolves in the H2Oto form a bicarbonate ion
[1, 3, 6, 7, 8, and 9]. The chemical reaction is as follows:
− + CO2 + H2O ↔ HCO3 + H (4)
− − + HCO ↔ CO + H 2
3 3 (5)
− + H2O ↔ OH + H (6)
+ + RR R NH ↔ RR R N + H ' ' ' ' (7)
− + H2 S ↔ HS + H (8)
− − + HS ↔ S + H 2 (9)
Here the R represents the methyl group and R′ to an ethanol group.
In the case of glycol contactor, the purity is greater than 99%, in the case of water free
glycol. The water removal is done with the help of the column of the bottom which is referred to
as glycol rich. The natural gas, which is dry, needs to be left in the top, keeping the absorption
column intact, which is further transferred to the gas plant and system of the pipeline. The
absorbers of the glycol can be columns, which are packed along with columns that are tray like.
The glycol is left as it is, followed by vapors of hydrocarbon. Later the glycol is removed.
Thereafter, the flash vessel along with the rich glycol is heated (Mansouri, Boukholda,
Bourouis & Bellagi, 2015). with the exchanger and is given in the stripper, which is
popularly known as the regenerator. The stripper of the glycol has reboiler, overhead
condenser. Apart from that, the trim cooler can be used as a cross exchanger along with
gas that is dry or with the help of exchanger that is air-cooled.

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Figure 1 - Steps on Aspen Plus
Conclusion-
With the help of the above-mentioned diagram, the Stream as well as Dry methane
reforming, along with CO2, O2, and coal, water, air is applied in the necessary steps.
References
Mansouri, R., Boukholda, I., Bourouis, M., & Bellagi, A. (2015). Modeling and testing the
performance of a commercial ammonia/water absorption chiller using the Aspen-Plus
platform. Energy, 93, 2374-2383.

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Parvez, A. M., Mujtaba, I. M., Hall, P., Lester, E. H., & Wu, T. (2016). Synthesis of Bio‐
Dimethyl Ether Based on Carbon Dioxide‐Enhanced Gasification of Biomass: Process
Simulation Using Aspen Plus. Energy Technology, 4(4), 526-535.