Dimethylamine-epichlorohydrin-ethylenediamine copolymer

Dimethylamine-epichlorohydrin-ethylenediamine copolymer (CAS 42751-79-1) is a cationic polyelectrolyte used in water treatment and process industries to destabilize suspended particles and facilitate their removal.

Where is Dimethylamine-epichlorohydrin-ethylenediamine copolymer used?

• Municipal and industrial water treatment: primary coagulant or coagulant aid, reducing turbidity and suspended solids ahead of filtration or sedimentation
• Pulp and paper: retention and drainage improvement on the wet end, helping fine fibers and fillers bind to the sheet
• Textile processing: dye fixation and effluent treatment, reducing color in discharge water
• Leather and tannery operations coagulate protein-rich streams.
• Combined with inorganic coagulants such as polyaluminium chloride or alum to improve removal of low-turbidity water and settling efficiency.

Good to know: Its quaternary amine functionality delivers a strong positive charge across a broad pH range. Technical grade is standard, with performance characterized by charge density and molecular weight rather than pharmacopeial standards like USP or Ph. Eur.

Formulation notes

• For water treatment, can be used alone after dilution to 0.05 to 0.5% solids.
• Dosing is typically continuous after dilution, with the optimal dosage determined by jar testing based on turbidity and water chemistry.

Typical specification

• Aqueous solutions typically have a pH in the range 4 to 7.
• Available as a 50 wt. % solution in water.
• Available with a molecular weight range of 90,000 to 150,000.

Regulatory status

• Maximum permitted content is 3% based on dry fiber.
• Epichlorohydrin must not be detected in the aqueous extract of the finished product, with a detection limit of 1 mg/kg.
• 1,3-dichloro-2-propanol must not be detected in the aqueous extract of the finished product, with a detection limit of 2 µg/l.

Storage, packaging and handling

• Sealed into drums or IBCs.

Frequently asked questions about Dimethylamine-epichlorohydrin-ethylenediamine copolymer

What regulatory limit applies to ethyleneimine in the resin?

Ethyleneimine must not be detected in the resin, with a detection limit of 0.1 mg/kg.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.