Stannous Oxalate (Tin(II) Oxalate) CAS 814-94-8

Stannous oxalate, also known as tin(II) oxalate, is a high-performance inorganic tin catalyst widely used in industrial chemistry. With the chemical formula SnC₂O₄ and CAS number 814-94-8, this white crystalline powder serves as an efficient, low-coloring catalyst for esterification, transesterification, and polycondensation reactions. It delivers excellent results in polyester production, plasticizer manufacturing, and textile processing while maintaining a favorable toxicity profile compared to many organotin alternatives.

Chemical and Physical Properties

It is a stable, high-purity compound with the following key characteristics:

  • Chemical Name: Stannous oxalate / Tin(II) oxalate
  • CAS Number: 814-94-8
  • Molecular Formula: SnC₂O₄
  • Molecular Weight: 206.73 g/mol
  • Appearance: White crystalline powder or colorless crystals
  • Density: 3.56 g/cm³
  • Melting Point: Approximately 280 °C (decomposes)
  • Solubility: Practically insoluble in water (0.5 g/L); soluble in dilute hydrochloric acid, methanol, and petroleum ether
  • EINECS: 212-414-0

Main Applications and Uses

Stannous oxalate excels as a catalyst where high activity at moderate temperatures and minimal color formation are required. Primary applications include:

  • Esterification and Polycondensation Catalyst: Accelerates production of organic esters, plasticizers, and polyesters (including PTT and other specialty polymers) at lower temperatures than traditional catalysts.
  • Textile Industry: Used in dyeing and printing processes for improved color fastness and fabric treatment.
  • Polymer and Resin Manufacturing: Effective in transesterification reactions and coal hydrogenation processes.
  • Other Industrial Uses: Serves as a reducing agent in select chemical syntheses and finds application in specialized coatings and battery research (anode materials).

Its high tin content (typically 56–58 %) and low volatility make it a preferred choice for manufacturers seeking consistent performance and reduced by-product formation.

Product Specifications (Industrial Grade)

  • Purity (as SnC₂O₄): ≥98.5 %
  • Tin (Sn) Content: 56.0–58.0 %
  • Moisture: ≤0.5 %
  • Insoluble Matter: ≤0.1 %
  • Heavy Metals (as Pb): ≤50 ppm
  • Iron (Fe): ≤50 ppm
  • Particle Size: –80 mesh (fine powder for rapid dispersion)

Custom specifications and higher-purity grades are available upon request.

Packaging and Storage

Stannous oxalate is supplied in moisture-proof packaging to preserve quality:

  • Standard packaging: 25 kg fiber drums or kraft paper bags with inner PE liners
  • Custom options: 50 kg drums or bulk bags for large-volume users

Storage Recommendations: Store in a cool, dry, well-ventilated area away from heat, direct sunlight, and oxidizing agents. Keep containers tightly sealed. Shelf life under proper conditions is 24 months.

Safety and Handling

Stannous oxalate is classified under GHS with the following hazards:

  • Harmful if swallowed (H302)
  • Harmful in contact with skin (H312)
  • Causes serious eye damage (H318)

Always use appropriate personal protective equipment (gloves, goggles, protective clothing, and dust respirator). Work in well-ventilated areas and follow local regulations for disposal. It is not classified as a carcinogen by IARC.

Frequently Asked Questions (FAQs)

What is Stannous Oxalate CAS 814-94-8?

Stannous oxalate (tin(II) oxalate) is an inorganic tin salt with the formula SnC₂O₄ and CAS number 814-94-8. It appears as a white crystalline powder and functions primarily as a catalyst in esterification and polymer reactions.

What are the primary uses of Stannous Oxalate?

It is mainly used as a catalyst for esterification, transesterification, and polycondensation in polyester and plasticizer production. It is also applied in textile dyeing/printing and as a reducing agent in specialized chemical processes.

Is Stannous Oxalate soluble in water?

It is practically insoluble in water (approximately 0.5 g/L) but dissolves readily in dilute acids such as hydrochloric acid.

What is the typical purity of industrial Stannous Oxalate?

Commercial industrial grades offer ≥98.5 % purity with tin content between 56.0 % and 58.0 %. Higher-purity grades are available for specialized applications.

How should Stannous Oxalate be stored?

Store in a cool, dry, well-ventilated place in tightly closed original containers. Avoid exposure to moisture, heat, and strong oxidizers. Shelf life is 24 months when stored correctly.

What safety precautions are required when handling Stannous Oxalate?

Wear protective gloves, clothing, eye/face protection, and a dust mask. Avoid inhalation, ingestion, and skin/eye contact. In case of exposure, rinse immediately and seek medical attention if necessary.

Can Stannous Oxalate be used in polyester production?

Yes. It is an effective catalyst for the synthesis of polyesters such as polytrimethylene terephthalate (PTT) and other engineering polymers, offering high activity and low color contribution.

What is the difference between Stannous Oxalate and other tin catalysts?

Stannous oxalate provides a high metal content, excellent catalytic efficiency at lower temperatures, and a lower toxicity profile than many organotin compounds, making it suitable for sensitive applications.

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