4-Octylmorpholine is primarily used as a surfactant and emulsifier in various industrial applications. It is effective in stabilizing emulsions, particularly in the formulation of paints, coatings, and adhesives, where it helps to improve the consistency and application properties. Additionally, it is utilized in the production of cleaning agents and detergents, where its surfactant properties aid in the removal of oils and greases. In the pharmaceutical industry, it serves as an intermediate in the synthesis of certain drugs. Its ability to act as a phase transfer catalyst also makes it valuable in organic synthesis, facilitating reactions between compounds in different phases.