Zinc Chloride Anhydrous – CAS No. 7646-85-7
Product Overview
Zinc Chloride Anhydrous, with the chemical formula ZnCl₂ and CAS Number 7646-85-7, is a highly pure, moisture-free inorganic salt widely recognized as a Lewis acid catalyst, fluxing agent, and dehydrating medium in organic synthesis, metalworking, and chemical processing. This white, odorless, free-flowing crystalline powder exhibits exceptional hygroscopicity and solubility in water (up to 432 g/100 mL at 25°C), delivering a strongly acidic pH of 4.0-5.0 in 5% solution for precise pH control and reaction acceleration. With a purity ≥99%, it excels in promoting esterifications, isomerizations, and Friedel-Crafts acylations without introducing water, ensuring higher yields and cleaner products. Its thermal stability up to 290°C decomposition supports flux applications in soldering and galvanizing, while low impurity levels make it suitable for pharmaceutical intermediates and wood preservatives, offering reliability in dry, high-precision environments.
Typical Properties of Zinc Chloride:
| Item | Standard |
| Assay (As ZnCl2) | 98% Min |
| Basic Salt (As ZnO) | 1.8% Max |
| Sulfate (SO4) | 0.01% Max |
| Iron (Fe) | 5 ppm Max |
| Lead (Pb) | 5 ppm Max |
| Cadmium (Cd) | 3 ppm Max |
| Copper (Cu) | 3 ppm Max |
| Manganese (Mn) | 5 ppm Max |
| Moisture | 0.5 % Max |
| Insoluble Acid | 0.05% Max |
| PH | 3-4 |
| Corrosion Test on Zinc Plate | Pass |
| Appearance | Powder – Granule |
Applications
Organic Synthesis and Catalysis
- Esterification and Acylation: Used at 1-5 mol% to catalyze reactions of alcohols and carboxylic acids, achieving 90%+ yields in biodiesel production.
- Pharmaceutical Intermediates: Dehydrating agent in cyclizations for antihistamines, ensuring anhydrous conditions for high-purity APIs.
Metalworking and Galvanizing
- Soldering Flux: Incorporated at 10-20% in formulations to clean copper and brass surfaces, promoting strong, oxide-free joints.
- Hot-Dip Galvanizing: 15-25% in pickle baths to etch steel, preparing for uniform zinc deposition.
Preservation and Industrial Uses
- Wood Treatment: Applied at 5-10% in fire-retardant impregnants to enhance char formation and fungal resistance.
- Battery Electrolytes: Additive in zinc-air cells for conductivity enhancement without hydration issues.
Why Choose Our Zinc Chloride Anhydrous?
Ours is vacuum-dried to <0.1% moisture and iron <5 ppm, providing exceptional flowability and catalytic potency without clumping or side reactions. Synthesizers report 20% faster reaction times and 15% higher selectivity in esterifications. Available in technical/pharma/industrial grades, packaged in 25kg desiccated bags or 50kg drums, with Kosher, Halal, and USP certifications for seamless integration.
Frequently Asked Questions (FAQs)
What is Zinc Chloride Anhydrous?
It is a dry zinc salt with formula ZnCl₂ and CAS 7646-85-7, used as a catalyst and flux. It’s a white powder that dehydrates and activates in reactions without water interference.
How is Zinc Chloride Anhydrous used in synthesis?
Add 2-4% to reaction mixtures under inert atmosphere; it coordinates with carbonyls to facilitate nucleophilic attacks, ideal for Friedel-Crafts without aqueous workup.
Is Zinc Chloride Anhydrous safe for handling?
Handle with gloves and ventilation—it’s irritant and hygroscopic; LD50 >2000 mg/kg oral, but store desiccated to avoid exothermic hydration.
What is the shelf life of Zinc Chloride Anhydrous?
In airtight, desiccated containers below 30°C, it remains stable for 2-3 years, with no decomposition or impurity buildup.
Can Zinc Chloride Anhydrous be used in flux formulations?
Yes, at 15-30% in aqueous pastes for soldering; its anhydrous form ensures consistent activity without dilution effects.
Does it affect pH in solutions?
Its acidic pH (4-5) provides mild acidity for catalysis, but neutralize with bases for neutral end-products if required.
What packaging options are available for Zinc Chloride Anhydrous?
We offer 25kg PE-lined paper bags, 50kg HDPE drums, and 1000kg supersacks, all desiccated for moisture control.
For catalytic guidelines, purity analysis, or custom packaging, our experts are ready to assist.
Contact Us
Elevate your processes with premium Zinc Chloride Anhydrous—Contact Us for samples, quotes, or technical support.
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