One or several substances dispersed in another medium in the form of a system called the casual system. The material was dispersed as particles, and continuous media as the dispersion medium.

Cases:Such as salt water, salt is decentralized system is divided into heterogeneous and homogeneous dispersion of the decentralized system. Low molecular weight polymer solution and the solution of the homogeneous dispersion. Sol and scattered rough.

For the spread of the multiphase system. Dispersion of the scattered into ions of the material called decentralized, the other a substance called dispersing agent.

Dispersant is a molecule at the same time in the lipophilic and hydrophilic nature of the two opposing surfactant. Those can be difficult to homogeneous dispersion of inorganic dissolved in the liquid, The solid particles of paint, but also to prevent the solid particles and the settlement pool, a stable suspension of pharmaceutical requirements.

PESA can be used in system of oilfield refill water, crude oil dehydration and boiler;

PESA can be used in circulating cool water system of steel, petrochemical, power plant, medicine.

PESA can be used in boiler water, circulating cool water, desalination plant, and membrane separation in situation of high alkaline, high hardness, high pH value and high concentration index.

PESA can be used in detergent fields.