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51313-02158-Surfactant Properties of Alkylbenzyldimethylammonium Chloride Oilfield Corrosion Inhibitors

Picture for Surfactant Properties of Alkylbenzyldimethylammonium Chloride Oilfield Corrosion Inhibitors
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Product Number: 51313-02158-SG
ISBN: 02158 2013 CP
Author: padina alaei
Publication Date: 2013
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Surfactant properties of alkylbenzyldimethylammonium chloride oilfield corrosion inhibitors and their effects on corrosion inhibition.

Padina Alaei Bernard P. Binks and Paul D. I. Fletcher

Surfactant and Colloid Group Department of Chemistry
University of Hull Hull HU6 7RX United Kingdom

Organic corrosion inhibitors such as the homologous series of alkylbenzyldimethylammonium chlorides (CnBDMAC) consist of a hydrophobic tail coupled to a hydrophilic headgroup and thus have surfactant functionality in addition to their corrosion inhibition action. They inhibit corrosion by adsorption to the steel-water interface to create a surface film which can act to slow the rate of corrosion by several orders of magnitude. The surfactant properties of these species can affect their efficacy as corrosion inhibitors in several ways. Firstly they can adsorb competitively on “parasitic” surfaces such as sand which then decreases their adsorption at the steel-water surface and hence reduces their corrosion inhibitor action. Secondly in the presence of oil they can partition to the oil phase which depletes the aqueous phase concentration and again reduces the inhibitor effectiveness. The aim of this study is to elucidate how measured surfactant properties (adsorption aggregation and distribution into oil) of CnBDMAC inhibitors (with alkyl chain lengths n ranging from 10 to 16 carbons) affect their efficacy as corrosion inhibitors.

Results are presented and discussed for:
• Adsorption isotherms for CnBDMAC at steel-water and sand-water interfaces as functions of chain length n temperature and brine concentration.
• How the measured corrosion rate varies with the adsorbed surface concentration of CnBDMAC.
• Quantitative modelling and experimental validation of how adsorption at the sand-water surface reduces the effectiveness of corrosion inhibition.
• Aggregation and distribution of CnBDMAC in systems containing brine and toluene oil as functions of CnBDMAC concentration chain length n and brine concentration.
• How the presence of oil reduces the corrosion inhibition and whether this effect can be quantitatively predicted from lab-based measurements of the CnBDMAC distribution.
Currently labour intensive trials have to be used to ensure optimisation of a corrosion inhibitor formulation to work under particular field conditions of for example sand and oil content. The work presented here shows how lab-based measurements can be used to predict how an inhibitor will work under set field conditions.
 

Surfactant properties of alkylbenzyldimethylammonium chloride oilfield corrosion inhibitors and their effects on corrosion inhibition.

Padina Alaei Bernard P. Binks and Paul D. I. Fletcher

Surfactant and Colloid Group Department of Chemistry
University of Hull Hull HU6 7RX United Kingdom

Organic corrosion inhibitors such as the homologous series of alkylbenzyldimethylammonium chlorides (CnBDMAC) consist of a hydrophobic tail coupled to a hydrophilic headgroup and thus have surfactant functionality in addition to their corrosion inhibition action. They inhibit corrosion by adsorption to the steel-water interface to create a surface film which can act to slow the rate of corrosion by several orders of magnitude. The surfactant properties of these species can affect their efficacy as corrosion inhibitors in several ways. Firstly they can adsorb competitively on “parasitic” surfaces such as sand which then decreases their adsorption at the steel-water surface and hence reduces their corrosion inhibitor action. Secondly in the presence of oil they can partition to the oil phase which depletes the aqueous phase concentration and again reduces the inhibitor effectiveness. The aim of this study is to elucidate how measured surfactant properties (adsorption aggregation and distribution into oil) of CnBDMAC inhibitors (with alkyl chain lengths n ranging from 10 to 16 carbons) affect their efficacy as corrosion inhibitors.

Results are presented and discussed for:
• Adsorption isotherms for CnBDMAC at steel-water and sand-water interfaces as functions of chain length n temperature and brine concentration.
• How the measured corrosion rate varies with the adsorbed surface concentration of CnBDMAC.
• Quantitative modelling and experimental validation of how adsorption at the sand-water surface reduces the effectiveness of corrosion inhibition.
• Aggregation and distribution of CnBDMAC in systems containing brine and toluene oil as functions of CnBDMAC concentration chain length n and brine concentration.
• How the presence of oil reduces the corrosion inhibition and whether this effect can be quantitatively predicted from lab-based measurements of the CnBDMAC distribution.
Currently labour intensive trials have to be used to ensure optimisation of a corrosion inhibitor formulation to work under particular field conditions of for example sand and oil content. The work presented here shows how lab-based measurements can be used to predict how an inhibitor will work under set field conditions.
 

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