Study of Cation-exchange Capacity in Alkylamine Intercalation of Montmorillonite

doi:10.11885/j.issn.1674-5086.2017.08.08.02

Abstract

Abstract: In view of the lack of quantitative assessment methods for alkylamine as an intercalation inhibitor to inhibit the hydration expansion of clay minerals, the cation-exchange capacity (CEC) of intercalation of montmorillonite with alkylamine (hexamethylenediamine and branched polyethyleneimine) was studied. The alkylamine montmorillonite composite was characterized by infrared spectroscopy. The CEC value of the alkylamine-intercalated montmorillonite composite was measured by different cation-exchange capacity methods and qualitatively verified by photoelectron spectroscopy. It was found that the ammonium chloride-ammonium acetate method could not only accurately measure the CEC value of montmorillonite but also accurately measure the CEC value of the alkylamine montmorillonite composite. Branched polyethyleneimine can displace a higher number of exchangeable cations than hexamethylene diamine, suggesting that with increasing number of primary amine groups, the inhibition performance improves. Therefore, the CEC value of alkylamine-intercalated montmorillonite composites can be quantitatively determined using the ammonium chloride-ammonium acetate method, which is an accurate quantitative method for assessing the inhibition performance of shale intercalation agents.

Key words: shale intercalation agents, alkylamine, montmorillonite, cation-exchange capacity, inhibition performance

CLC Number:

TE25

XIE Gang, LUO Pingya, DENG Mingyi. Study of Cation-exchange Capacity in Alkylamine Intercalation of Montmorillonite[J]. 西南石油大学学报(自然科学版), 2018, 40(6): 165-171.

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