Caustic Soda Liquid 32–50% — Membrane-Grade NaOH for Pulp, Alumina & Soap Plants

Product overview

Liquid caustic soda (sodium hydroxide solution) is the primary alkali output of membrane chlor-alkali electrolysis and one of the highest-volume industrial chemicals traded in bulk worldwide. Our export grades at 32% and 50% NaOH deliver the low-chloride purity profile that membrane cells achieve — sodium chloride capped at 50 ppm and iron at 10 ppm — making this solution suitable for Bayer-process alumina digestion, kraft pulp cooking liquor makeup, continuous soap saponification and municipal water pH correction without chloride contamination of downstream circuits.

Concentration choice reflects freight economics against dilution capacity at the receiver: 50% NaOH maximizes alkali content per nickel-lined ISO tank movement and is the standard feed for alumina refineries and large detergent complexes with heated storage. The 32% grade suits pulp mills, textile mercerization plants and regional distributors who prefer lower viscosity and reduced crystallization risk during cold-weather storage. Origins include integrated chlor-alkali complexes in the Black Sea basin, North Africa and the Arabian Gulf with dedicated caustic loading jetties and heated ISO tank filling bays.

Typical buyers include alumina refineries securing merchant caustic when own evaporation trains run at reduced rates, pulp and paper groups building seasonal cooking-liquor inventory, oleochemical and soap manufacturers on continuous saponification campaigns, and water-treatment operators dosing alkalinity ahead of coagulation stages. HS code 2815.12. MOQ from 100 MT on FOB, CFR or CIF terms.

Full specification

Loading ports & logistics

Liquid caustic soda is a Class 8 corrosive that attacks aluminium, zinc and unprotected carbon steel — every transfer point from loading arm to receiver tank must use alkali-compatible materials. We coordinate three principal delivery modes depending on parcel size and discharge infrastructure.

Nickel-lined or 316L stainless steel ISO tank containers hold approximately 20–24 MT net per unit and suit multi-modal routes to inland pulp mills, soap plants and water-treatment facilities with dedicated caustic unloading bays. Heated tank options are available for 50% grades in winter loading windows. Ideal for parcels of 100–500 MT assembled from multiple tank units on FOB Black Sea or MENA origins.

Dedicated alkali road tankers and coastal chemical barges move parcels of 500–2,000 MT on short-sea routes between chlor-alkali complexes and Mediterranean or Red Sea discharge terminals. Nickel-lined cargo tanks are mandatory; receivers must confirm heating capacity for 50% solution to prevent pipe-line crystallization during discharge.

Nickel-lined parcel tankers handle larger industrial contracts above 2,000 MT on long-haul routes to dedicated caustic jetties in India, Turkey and West Africa. FOB loading at exporter-nominated alkali berth; CFR and CIF quotes include tank freight, marine insurance and discharge-port compatibility check before firm offer. Typical lead time 10–20 days from contract execution to loading window.

Packaging & documentation

Cargo ships as liquid NaOH solution in nickel-lined or 316L stainless ISO tank containers, dedicated alkali road tankers or nickel-lined chemical tankers — bulk merchant grade is not offered in drums or IBCs. Each lot is accompanied by a mill certificate of analysis showing NaOH titre, chloride, iron and carbonate results, safety data sheet (SDS) per GHS with corrosive hazard classification, commercial invoice, tank list, bill of lading and certificate of origin.

Concentration is confirmed by acid-base titration against standardized HCl on the COA, with density cross-check via calibrated hydrometer at 20 °C. Third-party inspection (SGS, Bureau Veritas or equivalent) at loading can be arranged on buyer request. Tank cleanliness certificate and previous-cargo confirmation are mandatory before ISO reload; aluminium and acid residues are excluded from acceptable prior cargoes. IMO dangerous goods declaration and emergency response guide references are included for Class 8 corrosive carriage.

FAQ

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