The quality of brine in chlor-alkali production is crucial. Traditional primary brine purification does not meet the required standards, so secondary purification of the brine is necessary.

In concentrated hydrochloric acid, metal ions mainly exist in the form of complex anions. LSC series ion exchange resins can effectively remove iron ions and also remove other metal ions to varying degrees. Contaminated hydrochloric acid passes through a special ion exchange resin, and the exchange process capture the iron thanks to the very high selectivity. Once the LSC series ion exchange resin is saturated with iron ions, it can be regenerated with deionized water (distilled water). After regeneration, the ion exchange resin is restored to its original state and can be repeatedly used for exchange and regeneration.

Sunresin provides a mature ion exchange resin process for acetic acid purification, which can remove bromine or chloride ions in acetic acid to less than 5ppm, or undetectable levels. The fixed bed mode is recommended for the ion exchange process for acetic acid purification, which runs continuously and removes impurities through the front and back resin columns to improve the removal accuracy and ensure the maximum utilization of the resins. For details, refer to the figure below.

In the chlor-alkali industry, the use of ion-exchange membrane electrolyzers to produce sodium hydroxide has become a common practice. However, this membrane method requires that the content of calcium and magnesium ions in the brine into the tank be less than 20ppb. The old refining method can only reduce the content of calcium and magnesium ions in the brine to about 1 ppm.

Ethylene glycol (EG) is an important organic chemical raw material. It is mainly used to synthesize polyester polyester and polyester resin, produce hygroscopic agents, plasticizers, surfactants, cosmetics and explosives, and used as dyes, inks, solvent, formulating engine antifreeze, etc.

Sunresin developed Seplite® LWT510 macroporous adsorption resin and Seplite® MA396 special resin for iron removal.

EPS is made of polystyrene resin as the main body, adding foaming agent and other additives. It is a kind of buffer material that is widely used at present. Polytyrene resin suppliers in China are mainly concentrated in Northeast China, Jiangsu and Zhejiang, Beijing, Tianjin and Hebei, and most of them are small and medium-sized enterprises. Sunresin is a professional manufacturer.

Adipic acid is an important chemical raw material, mainly producing nylon 66.