imran rahman - Academia.edu (original) (raw)

Papers by imran rahman

Research paper thumbnail of The Path Ahead for Ionic Liquids

Chemical Engineering & Technology, Jul 1, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An Improved Process for Manufacture of Epoxides, Particularly Epichlorohydrin

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stabilization of complex chaotic dynamics of chemical processes using a fuzzy logic controller

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adaptive recursive least squares fuzzy controller

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nonlinear control using neuro-fuzzy network

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Process Identification using GP: A Case Study Involving FCC Unit

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hybrid PCA-Fuzzy Neural Network Formalism for Batch Process Monitoring

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Separation Processes in Biopolymer Production

Ramaswamy/Separation and Purification Technologies in Biorefineries, 2013

ABSTRACT Recently lactic acid (LA) and its polymer, polylactic acid (PLA), have attracted the att... more ABSTRACT Recently lactic acid (LA) and its polymer, polylactic acid (PLA), have attracted the attention of world researchers due to their versatile commercial applications. Whether LA can be used to its full potential largely depends on whether it can be produced in a cost-effective manner with high purity and optical activity. The major technology barrier in the costeffective production of high-purity lactic acid is its downstream separation and purification. This chapter presents a case study where different techniques such as electrodialysis, adsorption, solvent extraction, membrane separation and reactive distillation were analyzed for separation of lactic acid from fermentation froth. Among them, reactive distillation was found to be promising at an industrial scale. Autocatalytic reactive distillation of lactic acid with methanol using a packed bed column followed by hydrolysis of methyl lactate with lactic acid catalyst, using three CSTRs in series, has been reported for purification of lactic acid.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Purification of Lactic Acid via Esterification of Lactic Acid Using a Packed Column, Followed by Hydrolysis of Methyl Lactate Using Three Continuously Stirred Tank Reactors (CSTRs) in Series: A Continuous Pilot Plant Study

Industrial & Engineering Chemistry Research, 2011

ABSTRACT The world market of lactic acid is growing every year, mainly as a solvent and precursor... more ABSTRACT The world market of lactic acid is growing every year, mainly as a solvent and precursor to poly(lactic acid) (PLA). The cost of renewable biomass-derived PLA will have to compete with other synthetic polymers, if it is to grab a significant and sustainable fraction of the market share. It is thus necessary to have efficient and cost-effective technology for the production of pure-grade lactic acid (LA). In this article, a novel cost-effective, eco-friendly continuous process for the production of high-quality lactic acid at pilot plant scale has been demonstrated. The novelty of this process is that, for the first time, we report and use the concept of inverse reactive distillation for the esterification of crude concentrated LA in a continuous countercurrent packed column mode. This allows us to operate the column at higher temperatures, improving the kinetic rate process and leading to shorter columns. This is followed by the hydrolysis of methyl lactate (MLA) in a series of three continuously stirred tank reactors (CSTRs), where LA itself acts as a catalyst. The LA obtained in the pilot plant process shows 99.81% purity (by weight) on water-free basis and has an optical purity of 99.9%. The pilot scale experimental results pertaining to the autocatalytic esterification of LA and hydrolysis of MLA have been compared and validated, with respect to simulated results. The innovations reported here can make the process economically viable for commercial use.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Path Ahead for Ionic Liquids

Chemical Engineering & Technology, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of fuzzy logic controller using genetic algorithms

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Pilot Plant Study of Recovery of Lactic Acid from Ethyl Lactate

Organic Process Research & Development, 2009

Purified lactic acid is used for production of biodegradable polymer. Esterification with ethanol... more Purified lactic acid is used for production of biodegradable polymer. Esterification with ethanol and subsequent hydrolysis in distillation columns to produce purified lactic acid without catalyst has obvious advantages. In this paper, we present a pilot-plant study of ethyl lactate ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evaluation of repulsive particle swarm method for phase equilibrium and phase stability problems

Fluid Phase Equilibria, 2009

In literature, there are two broad approaches for phase equilibrium calculations: Gibbs' fre... more In literature, there are two broad approaches for phase equilibrium calculations: Gibbs' free energy minimization and solving non-linear equations for stationary points [1]. According to McDonald and Floudas [2], due to complexity of UNIFAC, modified Wilson, or ASOG activity ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development of a Soft Sensor for a Batch Distillation Column Using Support Vector Regression Techniques

Chemical Engineering Research & Design, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of Continuous Distillation Columns Using Stochastic Optimization Approaches

Chemical Engineering Research & Design, 2001

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of a Continuous Process for the Recovery of Lactic Acid Using Differential Evolution Algorithm

Chemical Product and Process Modeling, 2008

∗Chemical Engineering & Process Development Division, National Chemical Laboratory, Pune-4110... more ∗Chemical Engineering & Process Development Division, National Chemical Laboratory, Pune-411008, India, r.imran@ncl.res.in †Chemical Engineering Department, National Institute of Technology (NIT), Warangal - 506 004, India, arsalanchem@gmail.com ‡Chemical ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Comparative assessment of downstream processing options for lactic acid

Separation and Purification Technology, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Path Ahead for Ionic Liquids

Chemical Engineering & Technology, Jul 1, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An Improved Process for Manufacture of Epoxides, Particularly Epichlorohydrin

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stabilization of complex chaotic dynamics of chemical processes using a fuzzy logic controller

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adaptive recursive least squares fuzzy controller

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nonlinear control using neuro-fuzzy network

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Process Identification using GP: A Case Study Involving FCC Unit

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hybrid PCA-Fuzzy Neural Network Formalism for Batch Process Monitoring

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Separation Processes in Biopolymer Production

Ramaswamy/Separation and Purification Technologies in Biorefineries, 2013

ABSTRACT Recently lactic acid (LA) and its polymer, polylactic acid (PLA), have attracted the att... more ABSTRACT Recently lactic acid (LA) and its polymer, polylactic acid (PLA), have attracted the attention of world researchers due to their versatile commercial applications. Whether LA can be used to its full potential largely depends on whether it can be produced in a cost-effective manner with high purity and optical activity. The major technology barrier in the costeffective production of high-purity lactic acid is its downstream separation and purification. This chapter presents a case study where different techniques such as electrodialysis, adsorption, solvent extraction, membrane separation and reactive distillation were analyzed for separation of lactic acid from fermentation froth. Among them, reactive distillation was found to be promising at an industrial scale. Autocatalytic reactive distillation of lactic acid with methanol using a packed bed column followed by hydrolysis of methyl lactate with lactic acid catalyst, using three CSTRs in series, has been reported for purification of lactic acid.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Purification of Lactic Acid via Esterification of Lactic Acid Using a Packed Column, Followed by Hydrolysis of Methyl Lactate Using Three Continuously Stirred Tank Reactors (CSTRs) in Series: A Continuous Pilot Plant Study

Industrial & Engineering Chemistry Research, 2011

ABSTRACT The world market of lactic acid is growing every year, mainly as a solvent and precursor... more ABSTRACT The world market of lactic acid is growing every year, mainly as a solvent and precursor to poly(lactic acid) (PLA). The cost of renewable biomass-derived PLA will have to compete with other synthetic polymers, if it is to grab a significant and sustainable fraction of the market share. It is thus necessary to have efficient and cost-effective technology for the production of pure-grade lactic acid (LA). In this article, a novel cost-effective, eco-friendly continuous process for the production of high-quality lactic acid at pilot plant scale has been demonstrated. The novelty of this process is that, for the first time, we report and use the concept of inverse reactive distillation for the esterification of crude concentrated LA in a continuous countercurrent packed column mode. This allows us to operate the column at higher temperatures, improving the kinetic rate process and leading to shorter columns. This is followed by the hydrolysis of methyl lactate (MLA) in a series of three continuously stirred tank reactors (CSTRs), where LA itself acts as a catalyst. The LA obtained in the pilot plant process shows 99.81% purity (by weight) on water-free basis and has an optical purity of 99.9%. The pilot scale experimental results pertaining to the autocatalytic esterification of LA and hydrolysis of MLA have been compared and validated, with respect to simulated results. The innovations reported here can make the process economically viable for commercial use.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Path Ahead for Ionic Liquids

Chemical Engineering & Technology, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of fuzzy logic controller using genetic algorithms

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Pilot Plant Study of Recovery of Lactic Acid from Ethyl Lactate

Organic Process Research & Development, 2009

Purified lactic acid is used for production of biodegradable polymer. Esterification with ethanol... more Purified lactic acid is used for production of biodegradable polymer. Esterification with ethanol and subsequent hydrolysis in distillation columns to produce purified lactic acid without catalyst has obvious advantages. In this paper, we present a pilot-plant study of ethyl lactate ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evaluation of repulsive particle swarm method for phase equilibrium and phase stability problems

Fluid Phase Equilibria, 2009

In literature, there are two broad approaches for phase equilibrium calculations: Gibbs' fre... more In literature, there are two broad approaches for phase equilibrium calculations: Gibbs' free energy minimization and solving non-linear equations for stationary points [1]. According to McDonald and Floudas [2], due to complexity of UNIFAC, modified Wilson, or ASOG activity ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development of a Soft Sensor for a Batch Distillation Column Using Support Vector Regression Techniques

Chemical Engineering Research & Design, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of Continuous Distillation Columns Using Stochastic Optimization Approaches

Chemical Engineering Research & Design, 2001

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of a Continuous Process for the Recovery of Lactic Acid Using Differential Evolution Algorithm

Chemical Product and Process Modeling, 2008

∗Chemical Engineering & Process Development Division, National Chemical Laboratory, Pune-4110... more ∗Chemical Engineering & Process Development Division, National Chemical Laboratory, Pune-411008, India, r.imran@ncl.res.in †Chemical Engineering Department, National Institute of Technology (NIT), Warangal - 506 004, India, arsalanchem@gmail.com ‡Chemical ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Comparative assessment of downstream processing options for lactic acid

Separation and Purification Technology, 2006

Bookmarks Related papers MentionsView impact