Alkylaromatics in Detergents Manufacture

Modeling and Optimizing Linear Alkylbenzene Sulfonation

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4 Citations (Scopus)

Abstract

Linear alkylbenzene sulfonic acid (ASA) is the main ingredient of many commercial formulations for industrial and domestic synthetic detergents. The current industrial ASA production method includes sulfonation of linear alkylbenzene (LAB) with sulfur trioxide in tubular falling-film reactors. The present study investigates the influence of light alkylaromatics on the efficiency of ASA production. After dealkylation and polymerization, these aromatic compounds form viscous components in the sulfonation reactor. This increases the organic liquid viscosity and disrupts the uniformity of sulfonation. We present the results of IR analysis of the LAB and ASA samples, which indicate that the viscous components are sulfones that are part of the unsulfonated matter. With due consideration of the sulfonation process reaction network, we developed a mathematical model for a sulfonation reactor considering the alkylaromatics content in the feed flow and its effect on the reaction rates. The results allowed the improvement of sulfonation process in terms of increasing the number of days between the reactor washings. The sulfur flow rate increased from 371.7 to 380.9 kg h−1 at the end of this period for the aromatics content in LAB of 4 wt.% and from 372.1 to 380.1 kg h−1 for aromatics content in LAB of 6 wt.%. The proposed modifications of the process modes can increase the SO3 conversion up to 98%.

Original languageEnglish
Pages (from-to)175-184
Number of pages10
JournalJournal of Surfactants and Detergents
Volume21
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

Sulfonation
detergents
sulfonic acid
Detergents
Sulfonic Acids
reactors
sulfur
Acids
production engineering
sulfones
organic liquids
aromatic compounds
washing
Sulfur
falling
ingredients
Viscosity of liquids
mathematical models
Sulfones
reaction kinetics

Keywords

  • Linear alkylbenzene sulfonic acid
  • Mathematical model of sulfonation process
  • Sulfones
  • Sulfur trioxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

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title = "Alkylaromatics in Detergents Manufacture: Modeling and Optimizing Linear Alkylbenzene Sulfonation",
abstract = "Linear alkylbenzene sulfonic acid (ASA) is the main ingredient of many commercial formulations for industrial and domestic synthetic detergents. The current industrial ASA production method includes sulfonation of linear alkylbenzene (LAB) with sulfur trioxide in tubular falling-film reactors. The present study investigates the influence of light alkylaromatics on the efficiency of ASA production. After dealkylation and polymerization, these aromatic compounds form viscous components in the sulfonation reactor. This increases the organic liquid viscosity and disrupts the uniformity of sulfonation. We present the results of IR analysis of the LAB and ASA samples, which indicate that the viscous components are sulfones that are part of the unsulfonated matter. With due consideration of the sulfonation process reaction network, we developed a mathematical model for a sulfonation reactor considering the alkylaromatics content in the feed flow and its effect on the reaction rates. The results allowed the improvement of sulfonation process in terms of increasing the number of days between the reactor washings. The sulfur flow rate increased from 371.7 to 380.9 kg h−1 at the end of this period for the aromatics content in LAB of 4 wt.{\%} and from 372.1 to 380.1 kg h−1 for aromatics content in LAB of 6 wt.{\%}. The proposed modifications of the process modes can increase the SO3 conversion up to 98{\%}.",
keywords = "Linear alkylbenzene sulfonic acid, Mathematical model of sulfonation process, Sulfones, Sulfur trioxide",
author = "Irena Dolganova and Igor Dolganov and Emiliya Ivanchina and Elena Ivashkina",
year = "2018",
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language = "English",
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journal = "Journal of Surfactants and Detergents",
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T1 - Alkylaromatics in Detergents Manufacture

T2 - Modeling and Optimizing Linear Alkylbenzene Sulfonation

AU - Dolganova, Irena

AU - Dolganov, Igor

AU - Ivanchina, Emiliya

AU - Ivashkina, Elena

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Linear alkylbenzene sulfonic acid (ASA) is the main ingredient of many commercial formulations for industrial and domestic synthetic detergents. The current industrial ASA production method includes sulfonation of linear alkylbenzene (LAB) with sulfur trioxide in tubular falling-film reactors. The present study investigates the influence of light alkylaromatics on the efficiency of ASA production. After dealkylation and polymerization, these aromatic compounds form viscous components in the sulfonation reactor. This increases the organic liquid viscosity and disrupts the uniformity of sulfonation. We present the results of IR analysis of the LAB and ASA samples, which indicate that the viscous components are sulfones that are part of the unsulfonated matter. With due consideration of the sulfonation process reaction network, we developed a mathematical model for a sulfonation reactor considering the alkylaromatics content in the feed flow and its effect on the reaction rates. The results allowed the improvement of sulfonation process in terms of increasing the number of days between the reactor washings. The sulfur flow rate increased from 371.7 to 380.9 kg h−1 at the end of this period for the aromatics content in LAB of 4 wt.% and from 372.1 to 380.1 kg h−1 for aromatics content in LAB of 6 wt.%. The proposed modifications of the process modes can increase the SO3 conversion up to 98%.

AB - Linear alkylbenzene sulfonic acid (ASA) is the main ingredient of many commercial formulations for industrial and domestic synthetic detergents. The current industrial ASA production method includes sulfonation of linear alkylbenzene (LAB) with sulfur trioxide in tubular falling-film reactors. The present study investigates the influence of light alkylaromatics on the efficiency of ASA production. After dealkylation and polymerization, these aromatic compounds form viscous components in the sulfonation reactor. This increases the organic liquid viscosity and disrupts the uniformity of sulfonation. We present the results of IR analysis of the LAB and ASA samples, which indicate that the viscous components are sulfones that are part of the unsulfonated matter. With due consideration of the sulfonation process reaction network, we developed a mathematical model for a sulfonation reactor considering the alkylaromatics content in the feed flow and its effect on the reaction rates. The results allowed the improvement of sulfonation process in terms of increasing the number of days between the reactor washings. The sulfur flow rate increased from 371.7 to 380.9 kg h−1 at the end of this period for the aromatics content in LAB of 4 wt.% and from 372.1 to 380.1 kg h−1 for aromatics content in LAB of 6 wt.%. The proposed modifications of the process modes can increase the SO3 conversion up to 98%.

KW - Linear alkylbenzene sulfonic acid

KW - Mathematical model of sulfonation process

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KW - Sulfur trioxide

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