What is Barium Acetate?
Barium acetate, (CH3COO)2Ba, is a water-soluble barium salt typically produced by reacting barium sulfide with acetic acid or a cation exchange resin in acetate form. It is a crystalline solid with a molecular weight of 255.42 g/mol and good solubility in water.
Properties of Barium Acetate
- It exists as trihydrate (Ba(CH3COO)2·3H2O) and anhydrous forms. A new hydrate phase, [Ba6(C2H3O2)12(H2O)3.5], has also been reported.
- It is used as a precursor for preparing barium-containing materials like barium titanate (BaTiO3), which is a widely used dielectric material in capacitors and other electronic components.
- It finds applications in the production of vinyl acetate, as a reagent in chemical analysis, and in the glass and ceramic industries.
- High-purity one is required for various applications, and specialized equipment like evaporative crystallization units and breakage-proof transportation devices have been developed for its production and handling.
Preparation of Barium Acetate
- Reaction of barium carbonate with acetic acid: It reacts with acetic acid under reflux conditions to form a crude solution. The solution is filtered, treated with hydrogen peroxide, and adjusted to neutral pH with barium hydroxide. Evaporative crystallization and drying yield the final product.
- Ion exchange process: Aqueous barium sulfide solution is passed through a cation exchange resin (sodium or potassium form) or an anion exchange resin (acetate form). The isolated solution contains barium acetate, which can be further purified by recrystallization.
- Co-precipitation with oxalic acid: Industrial barium hydroxide is added to an acetic acid solution, followed by activated carbon, oxalic acid, and ammonium sulfide. After heating, filtering, and drying, high-purity barium acetate trihydrate is obtained. The mother liquor is concentrated to yield anhydrous barium acetate.
Applications of Barium Acetate
Pyrotechnics and Fireworks
It is a key ingredient in pyrotechnic compositions, imparting a green color to flames and fireworks displays. It is used in combination with other metal salts and oxidizers to produce vibrant colors and effects.
Analytical Chemistry
It finds applications in analytical chemistry as a reagent for the gravimetric determination of sulfates. It precipitates sulfate ions as insoluble barium sulfate, enabling quantitative analysis.
Textile and Leather Industry
It is employed as a mordant in the dyeing of textiles and leather. It helps fix dyes onto fibers, improving color fastness and enhancing the vibrancy of shades.
Ceramics and Glass Production
It is a precursor for the synthesis of barium compounds used in ceramics and glass manufacturing. It is a source of barium oxide, which imparts desirable properties like increased refractive index and improved insulation.
Medical Applications
Barium sulfate, derived from barium acetate, is widely used as a contrast agent in medical imaging techniques like X-ray examinations of the gastrointestinal tract. Its high density and radiopacity make it suitable for enhancing visibility.
Polymer and Coating Additives
It is employed as a precursor for barium-containing compounds used as fillers, pigments, and additives in polymers, coatings, and paints. These impart properties like increased opacity, improved mechanical strength, and flame retardancy.
Environmental Applications
It has potential applications in environmental remediation processes, such as the removal of sulfate ions from wastewater through precipitation as barium sulfate.
Application Cases
| Product/Project | Technical Outcomes | Application Scenarios |
|---|---|---|
| Green Pyrotechnic Compositions | Barium acetate imparts a vibrant green colour to flames and fireworks displays, enabling the creation of visually stunning pyrotechnic effects. | Fireworks displays, pyrotechnics for entertainment and special effects. |
| Sulfate Analysis in Analytical Chemistry | Barium acetate precipitates sulfate ions as insoluble barium sulfate, enabling quantitative gravimetric determination of sulfates in analytical chemistry applications. | Laboratories conducting chemical analysis, environmental monitoring, and quality control in various industries. |
| Textile and Leather Dyeing | Barium acetate acts as a mordant, fixing dyes onto fibres and enhancing colour fastness and vibrancy of shades in textiles and leather. | Textile and leather manufacturing industries, dyeing processes for fabrics and leather goods. |
| Barium Oxide Precursor for Ceramics and Glass | Barium acetate serves as a precursor for the synthesis of barium oxide, which imparts desirable properties like increased refractive index and improved insulation to ceramics and glass products. | Ceramics and glass manufacturing industries, production of speciality glasses and advanced ceramic materials. |
| Barium-based Medical Imaging Contrast Agents | Barium acetate is a precursor for the synthesis of barium-based contrast agents used in medical imaging techniques like X-ray and CT scans, enhancing the visibility of internal structures. | Healthcare facilities, hospitals, and diagnostic imaging centres conducting X-ray and CT scans. |
Latest Technical Innovations of Barium Acetate
Advanced Optical and Coating Applications
Barium acetate has found novel applications in the preparation of barium-containing polyacrylates for optical lenses and coatings with improved properties. These polymers exhibit a higher refractive index (up to 1.55) compared to conventional plastics (1.45-1.50), allowing for thinner and lighter lenses with equivalent optical performance to glass lenses. They also possess higher hardness and impact strength than traditional polymers.
Pharmaceutical and Biomedical Uses
Barium acetate is being explored for biomedical applications beyond its traditional use as an X-ray contrast agent. For instance, it has been investigated as a precursor for the synthesis of barium-based nanoparticles and composites with potential applications in drug delivery, bioimaging, and cancer therapy.
Functional Materials and Energy Storage
Barium acetate serves as a precursor for the synthesis of various functional materials, including barium titanate (BaTiO3) and other barium-based ceramics. These materials find applications in dielectric capacitors, piezoelectric devices, and energy storage systems like batteries and supercapacitors. Researchers are exploring novel synthesis routes and modifications to enhance the properties of these materials.
Environmental and Catalytic Applications
It has been studied as a precursor for the preparation of barium-based catalysts and adsorbents for environmental remediation. For example, barium-containing materials have shown potential for the removal of sulfur compounds from fuels, CO2 capture, and wastewater treatment.
Innovative Synthesis Methods
Researchers have developed novel and environmentally friendly methods for the synthesis of high-purity one. These include techniques like ion exchange processes, precipitation methods using oxalic acid, and co-production of crystalline and anhydrous forms. These methods aim to reduce industrial pollution and improve product quality.
Technical Challenges of Barium Acetate
| Synthesis of High-Purity Barium Acetate | Developing efficient and environmentally-friendly methods for synthesising high-purity barium acetate with minimal impurities and waste generation. |
| Novel Barium-Based Nanocomposites | Exploring the synthesis and applications of barium-based nanocomposites for drug delivery, bioimaging, and cancer therapy. |
| Barium Titanate Synthesis and Optimisation | Optimising the synthesis of barium titanate with smaller particle size and improved dielectric properties for electronic applications. |
| Barium Sulfate Purification and Modification | Developing processes for purifying and modifying barium sulfate to enhance its properties for applications in coatings, rubbers, and medical imaging. |
| Barium-Based Functional Materials | Synthesising and characterising novel barium-based functional materials for energy storage, capacitors, and piezoelectric devices. |
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