Octadecyl trimethyl ammonium chloride (OTAC)

Octadecyl trimethyl ammonium chloride (OTAC) is a waxy, white solid with a chemical formula of C21H46ClN. It exhibits solubility in water and other polar solvents. Widely employed as a cationic surfactant, OTAC finds applications across diverse industrial sectors, serving functions such as emulsification, dispersion, and detergency.

Energy Sector

Octadecyl trimethyl ammonium chloride (OTAC) finds diverse applications in the energy sector, contributing to enhanced oil recovery (EOR) processes as a surfactant. It effectively modifies the surface properties of reservoir rock, facilitating improved oil flow. Additionally, OTAC serves as a dispersant in drilling fluids, mitigating clump formation and enhancing drilling efficiency. Furthermore, ongoing studies explore its potential as a corrosion inhibitor for metal surfaces in the oil and gas industry. The versatile properties of OTAC make it a valuable asset across multiple energy sector applications.

Water Treatment

Octadecyl trimethyl ammonium chloride (OTAC) serves several purposes in water treatment processes. It acts as a coagulant aid, aiding in the coagulation and flocculation of suspended particles to enhance water quality. Additionally, OTAC can be used as a flotation agent to separate suspended solids from water and as a softening agent to remove hardness ions. However, it’s essential to regulate its use in water treatment to mitigate potential negative environmental impacts if not handled and disposed of properly.

Pulp & Paper

Octadecyl trimethyl ammonium chloride (OTAC) finds various applications in the pulp and paper industry. It contributes as a wet-end additive to enhance paper strength, retention, and drainage. Additionally, OTAC serves as a sizing agent to enhance water resistance and printability, and as a coating agent to improve surface properties and gloss. However, it’s important to exercise careful monitoring of OTAC’s use in the pulp and paper industry to address potential environmental concerns if not managed and disposed of properly.

CAS No.: 112-03-8


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