High Purity Na2WO4 Synthesis & Manufacturing Process Guide
For R&D teams and procurement specialists seeking reliable High purity precursors, understanding the underlying Manufacturing process is critical for quality assurance. This technical overview details the synthesis routes, analytical validation, and supply chain capabilities for Na2WO4. As a leading Chemical supplier, NINGBO INNO PHARMCHEM CO.,LTD. ensures every batch meets rigorous specifications for industrial and laboratory applications.
Deep Dive: Chemical Synthesis Route and Mechanism
The production of premium grade Sodium tungstate typically follows two primary pathways: wet chemical synthesis and solid-state reaction. The wet chemical method is preferred for achieving analytical reagent standards. This process begins with the dissolution of high-purity tungsten metal using concentrated hydrogen peroxide (30-40% w/w). This oxidation step is highly exothermic and converts metallic tungsten into tungstic acid intermediates.
Subsequent neutralization with sodium hydroxide (NaOH) adjusts the pH to approximately 13-14, forming a clear solution of the target salt. To ensure exceptional purity, ethanol is utilized as a precipitating agent. Since Na2WO4 is insoluble in ethanol while sodium hydroxide and other impurities remain soluble, this step effectively isolates the product. The resulting crystals are washed repeatedly to remove residual alkali, ensuring minimal carbonate contamination. Alternatively, solid-state synthesis involves reacting sodium carbonate with tungsten trioxide at temperatures between 450°C and 650°C, though this route requires careful control to prevent oxide evaporation.
For applications requiring strict impurity profiles, such as radiopharmaceuticals or optoelectronics, validation via Raman spectroscopy is essential. Characteristic bands at 928 cm⁻¹ and 812 cm⁻¹ confirm the integrity of the WO4 tetrahedra within the cubic spinel structure. NINGBO INNO PHARMCHEM CO.,LTD. leverages these precise synthesis controls to deliver consistent Sodium Tungstate Dihydrate suitable for sensitive catalytic processes.
| Parameter | Specification (Industrial Grade) | Specification (Analytical Reagent) | Test Method |
|---|---|---|---|
| Assay (Na2WO4·2H2O) | ≥ 99.0% | ≥ 99.9% | Titration / ICP-MS |
| Loss on Drying | ≤ 1.0% | ≤ 0.5% | Gravimetric (105°C) |
| pH Value (5% Solution) | 9.0 - 11.0 | 9.5 - 10.5 | pH Meter |
| Water Insolubles | ≤ 0.05% | ≤ 0.01% | Filtration |
| Heavy Metals (as Pb) | ≤ 10 ppm | ≤ 5 ppm | ICP-MS |
| Chloride (Cl) | ≤ 0.01% | ≤ 0.005% | Turbidimetry |
Supply Chain Stability and Packaging Options
Executive decision-makers prioritize regulatory compliance and logistical reliability. Our manufacturing facilities adhere to strict environmental and safety standards, ensuring compatibility with REACH and TSCA regulations for global export. We offer flexible packaging solutions to accommodate both laboratory-scale trials and Bulk price commercial orders. Standard options include 25kg kraft paper bags with PE liners for moisture protection, as well as 500kg drums for large-scale industrial usage.
Inventory management systems are designed to maintain steady stock levels of this strategic Fireproofing agent and catalyst precursor, minimizing lead times for international shipments. Each shipment is accompanied by comprehensive documentation, including batch-specific Certificates of Analysis (COA) and Safety Data Sheets (SDS). This transparency allows procurement teams to verify quality before deployment in production lines.
To request a batch-specific COA, SDS, or secure a bulk pricing quote, please contact our technical sales team.