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MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN

The removal of the condensable higher molecular weight constifuents from natural gas prior to its liquefaction is very important both from the technical and economic aspects-of the process. The higher molecular weight constituents like propanes, butanes, and pentanes have to be removed to very lo...

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Main Authors:	V. R. , Radhakrishnan, K. M. , Tan, H., Zabiri
Format:	Conference or Workshop Item
Published:	2004
Subjects:	TP Chemical technology
Online Access:	http://eprints.utp.edu.my/3868/1/somche2_paper1-new.pdf http://eprints.utp.edu.my/3868/
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spelling	my.utp.eprints.38682017-01-19T08:27:36Z MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN V. R. , Radhakrishnan K. M. , Tan H., Zabiri TP Chemical technology The removal of the condensable higher molecular weight constifuents from natural gas prior to its liquefaction is very important both from the technical and economic aspects-of the process. The higher molecular weight constituents like propanes, butanes, and pentanes have to be removed to very low levels from the methane content, so that the subsequent cryogenic _units can operate properly. Further, the higher molecular weight components have higher economic value and need to be sepaiated to realize betJer economic potential from the natural gas (NG) facility. The major process in the NG pretreatment to achieve the above objective is the distillation chain consisting of a chain of 4 distillation columns, namely, the demethaniser, deethaniser, depropaniser and the debutaniser' The high value of propane as a refrigerant for internal use in the cryogenic s-y,stemsm, akes its operation very critical to the overall economics of the plant. In viJw of this, Advanced Process Control techniques are often used for the control of this column. To develop proper APC strategies for the column it is essential to have a distillation column model. This paper presents certain preliminary work in developing a suitable column model for the depropaniser column. The column modeled'is "a +7-stage depro-panisecro lumn processing6 26.4 torslday of feed.T he column pressureis 1g.56b ar. The feed contains 6 components propane, i- and n- Butane, I and n- pentane and n- !9xqe The inputs to the simulation were the feed concentrations, flow rate and the distillate concentration. The model was solved from the bottom plate up, going from stage to stage. The material balance and temperature convergen.. rv.i. obtainJ usi"ng the theia convergence method. After the temperature has converged, the liquid and vapor flow rates were corected using the energy balances. The model developed in the study was able to predict the plate compositions of an existing industrial column to good accuracy. The model was used for generating answerst o many WHAT-IF tlpe of q:uestionsw; hilh can be used for plant optimization. 2004 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/3868/1/somche2_paper1-new.pdf V. R. , Radhakrishnan and K. M. , Tan and H., Zabiri (2004) MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN. In: SOMChE 2004, 12-14 December, 2004, UTP. http://eprints.utp.edu.my/3868/
institution	Universiti Teknologi Petronas
building	UTP Resource Centre
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Petronas
content_source	UTP Institutional Repository
url_provider	http://eprints.utp.edu.my/
topic	TP Chemical technology
spellingShingle	TP Chemical technology V. R. , Radhakrishnan K. M. , Tan H., Zabiri MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
description	The removal of the condensable higher molecular weight constifuents from natural gas prior to its liquefaction is very important both from the technical and economic aspects-of the process. The higher molecular weight constituents like propanes, butanes, and pentanes have to be removed to very low levels from the methane content, so that the subsequent cryogenic _units can operate properly. Further, the higher molecular weight components have higher economic value and need to be sepaiated to realize betJer economic potential from the natural gas (NG) facility. The major process in the NG pretreatment to achieve the above objective is the distillation chain consisting of a chain of 4 distillation columns, namely, the demethaniser, deethaniser, depropaniser and the debutaniser' The high value of propane as a refrigerant for internal use in the cryogenic s-y,stemsm, akes its operation very critical to the overall economics of the plant. In viJw of this, Advanced Process Control techniques are often used for the control of this column. To develop proper APC strategies for the column it is essential to have a distillation column model. This paper presents certain preliminary work in developing a suitable column model for the depropaniser column. The column modeled'is "a +7-stage depro-panisecro lumn processing6 26.4 torslday of feed.T he column pressureis 1g.56b ar. The feed contains 6 components propane, i- and n- Butane, I and n- pentane and n- !9xqe The inputs to the simulation were the feed concentrations, flow rate and the distillate concentration. The model was solved from the bottom plate up, going from stage to stage. The material balance and temperature convergen.. rv.i. obtainJ usi"ng the theia convergence method. After the temperature has converged, the liquid and vapor flow rates were corected using the energy balances. The model developed in the study was able to predict the plate compositions of an existing industrial column to good accuracy. The model was used for generating answerst o many WHAT-IF tlpe of q:uestionsw; hilh can be used for plant optimization.
format	Conference or Workshop Item
author	V. R. , Radhakrishnan K. M. , Tan H., Zabiri
author_facet	V. R. , Radhakrishnan K. M. , Tan H., Zabiri
author_sort	V. R. , Radhakrishnan
title	MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
title_short	MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
title_full	MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
title_fullStr	MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
title_full_unstemmed	MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN
title_sort	modeling of a liquefied natural gas (lng)depropaniser column
publishDate	2004
url	http://eprints.utp.edu.my/3868/1/somche2_paper1-new.pdf http://eprints.utp.edu.my/3868/
_version_	1738655301795577856
score	13.211869

MODELING OF A LIQUEFIED NATURAL GAS (LNG)DEPROPANISER COLUMN

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