Systematic Name:Barium dihydroxide
CAS Number:17194-00-2 (anhydrous), 12230-71-6 (octahydrate)
EC Number:241-234-5

Key Characteristics:

• Hyroscopicity:Readily absorbs CO? from air to form barium carbonate

• Crystal System:

  • Anhydrous: Orthorhombic (Pnma space group)

  • Octahydrate: Monoclinic (P2?/c space group)

• Refractive Index:1.50 (octahydrate)

• Magnetic Susceptibility:-72.010?? cm/mol

2. Advanced Physical-Chemical Data

Thermodynamic Properties

Phase Behavior

• Eutectic Point:With water at -78C (35.7 wt% Ba(OH)?)

• Dehydration Steps:

  1. Octahydrate ? Trihydrate at 55C

  2. Trihydrate ? Monohydrate at 130C

  3. Monohydrate ? Anhydrous at 300C

3. Industrial-Scale Production

Modern Manufacturing Processes

1. Continuous Hydration Reactor System

   • BaO + H?O ? Ba(OH)? (?H = -105 kJ/mol)

   • Temperature control at 80-90C

   • Yield: >98% pure product

2. Electrodialysis Method

   • Membrane-based separation from BaCl? solutions

   • Energy consumption: ~3.5 kWh/kg

3. High-Purity Crystallization

   • Multi-stage vacuum crystallization

   • Produces 99.99% pure crystals for electronic applications

Quality Specifications (Industrial Grade)

4. Advanced Applications

Emerging Technological Uses

• Superconductor Precursor:For YBCO thin film deposition

• Solid Oxide Fuel Cells:Electrolyte dopant

• Perovskite Solar Cells:Intermediate layer fabrication

Specialty Chemical Applications

• Organobarium Synthesis:Grignard-type reactions

• Polymer Stabilization:For high-temperature resins

• Nuclear Applications:Neutron shielding compositions

5. Safety & Toxicology

Exposure Limits

Ecotoxicity Data

• Daphnia magna EC50:2.1 mg/L (48h)

• Algal Growth Inhibition:0.8 mg/L (72h)

• Soil Microorganism Toxicity:LC50 = 45 mg/kg

6. Analytical Methods

Quantification Techniques

1. Gravimetric Analysis:

   • Precipitation as BaSO?

   • Detection limit: 0.1 mg/L

2. ICP-OES:

   • Wavelength: 455.403 nm

   • Linear range: 0.01-100 ppm

3. Ion Chromatography:

   • Column: Dionex IonPac CS12A

   • Eluent: 20 mM methanesulfonic acid

7. Storage & Handling Protocols

Optimal Storage Conditions

• Temperature:15-25C

• Humidity:<40% RH

• Container Type:Polyethylene with double sealing

• Shelf Life:24 months (unopened)

Spill Management

1. Small Spills:

   • Absorb with vermiculite

   • Neutralize with dilute sulfuric acid

2. Large Spills:

   • Contain with sand bags

   • Professional hazardous material team required

8. Global Market Overview

Production Capacity

Price Trends (2023)

• Industrial Grade:$1,200-1,500/ton

• Electronic Grade:$8,000-12,000/ton

• Pharma Grade:$15,000-20,000/ton

9. Recent Research Developments

Cutting-Edge Studies (2022-2023)

1. CO? Capture:

   • Absorption capacity: 2.3 mmol CO?/g at 25C

   • Regeneration efficiency: 92% after 50 cycles

2. Battery Applications:

   • Solid electrolyte additive for Li-S batteries

   • Improves cycle life by 300%

3. Nanomaterial Synthesis:

   • Template for BaTiO? nanowires

   • Aspect ratio control up to 1:500

10. Regulatory Update

Recent Changes (2023)

• EU REACH:New restrictions on industrial uses

• US EPA:Added to Toxics Release Inventory

• China:New export controls on high-purity grades

Conclusion

Barium hydroxide continues to evolve as a technically significant compound, finding new applications in advanced materials and green technologies while facing increasing regulatory scrutiny. The development of safer handling technologies and closed-loop production systems will likely determine its future industrial viability. Ongoing research into its nanoscale applications suggests potential breakthroughs in energy storage and environmental technologies, positioning this classic chemical for 21st century challenges.

What is Barium Sulfate?

Barium sulfate is a chemical compound made from the element barium (Ba), sulfur (S), and oxygen (O). Its chemical formula is BaSO?. It appears as a white, odorless powder and is insoluble in water, meaning it does not dissolve.

Even though barium itself can be poisonous, barium sulfate is safe to use in many products because it does not dissolve in water or in the human body.

Properties of Barium Sulfate

Here are some key characteristics of barium sulfate:

• Color: Bright white

• Form: Powder or crystals

• Density: High (heavy)

• Solubility: Does not dissolve in water

• Stability: Chemically stable

These properties make it useful in many technical and commercial applications.

Where Does Barium Sulfate Come From?

Barium sulfate is usually made from a natural mineral called barite. Barite is mined from the earth, crushed, and then purified to create pure barium sulfate. It can also be created through a chemical reaction by mixing a barium salt with sulfuric acid.

Uses of Barium Sulfate

1. Medical Imaging

One of the most common uses of barium sulfate is in hospitals for X-ray imaging of the stomach and intestines. It is mixed with water and swallowed by the patient. Because it is very dense, it helps doctors see the inside of the digestive system more clearly on X-rays.

This special mixture is known as a barium meal or barium swallow.

2. Oil and Gas Drilling

In the oil and gas industry, barium sulfate is added to drilling fluids (also called drilling mud). It helps control pressure while drilling deep into the ground. Its high weight makes it ideal for balancing pressure underground.

3. Paints and Coatings

Barium sulfate is used in paints, coatings, and inks. It improves the brightness, thickness, and durability of the paint. It also helps give a smooth and shiny finish.

4. Plastics and Rubber

In plastics and rubber manufacturing, barium sulfate is used as a filler. It adds weight, improves appearance, and helps block light or radiation. It is used in products like plastic pipes, rubber sheets, and floor tiles.

5. Cosmetics

In the cosmetic industry, small amounts of barium sulfate are used in powders, makeup, and skin care products to improve texture and brightness.

Benefits of Barium Sulfate

• ? Safe for Medical Use: Does not absorb into the body.

• ? Chemically Stable: Does not easily react with other substances.

• ? Non-Toxic in Solid Form: Unlike other barium compounds, it is safe.

• ? Affordable: It is widely available and cost-effective.

• ? Versatile: Can be used in many industries.

Is Barium Sulfate Safe?

Yes, barium sulfate is considered safe when used properly. In medicine, it is given only in a controlled amount and passes through the body without being absorbed.

However, other forms of barium that dissolve in water can be harmful. Thats why only insoluble barium sulfate is used in medical and industrial applications.

Environmental Impact

Barium sulfate is not dangerous to the environment. Since it does not dissolve in water, it does not move through soil or contaminate water. However, mining barite (the natural source) can have environmental effects if not done carefully.

Handling and Safety Tips

Even though barium sulfate is safe:

• Dont breathe in the dust.

• Use gloves and goggles if handling large amounts in factories.

• Follow proper safety rules in workplaces.

• Store it in a dry place away from chemicals.

Conclusion

Barium sulfate may seem like a simple white powder, but it plays a big role in many industries. From helping doctors take clear X-rays to making paints brighter and oil drilling safer, barium sulfate is a useful and trusted material. It is safe, stable, and valuable across many fields.