Sulfuric acid (CAS 7664-93-9) — Citrus N/A Note Fragrance Ingredient
Sulfuric acid
CAS 7664-93-9
What Is Sulfuric acid?
Sulfuric acid is a highly corrosive chemical primarily used in industrial processes, not in consumer fragrances. It is encountered in car batteries, cleaning agents, and manufacturing. Due to its extreme hazards, it has no place in perfumery and should never be used in any personal care products.
Safety Profile
PROFESSIONAL USEWhat Does Sulfuric acid Smell Like?
Sulfuric acid has no legitimate use in fragrance due to its highly corrosive nature. It produces pungent, acrid fumes that are harmful to inhale. Any perceived scent would be overpoweringly sharp and chemical, with no desirable olfactory characteristics for perfumery applications.
2D Molecular Structure
SMILES: OS(O)(=O)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
Sulfuric acid (H₂SO₄) is a strong mineral acid with no role in fragrance chemistry. It is produced industrially via the contact process, where sulfur dioxide is oxidized to sulfur trioxide and dissolved in water. Its primary uses are in fertilizer production, oil refining, and chemical synthesis – all far removed from perfumery applications.
Physical & Chemical Properties
| Boiling Point | 337 °C |
|---|---|
| Density | 1.84 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|
Classic Accords
Tip: This chemical should never be used in fragrance formulation under any circumstances.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not approved for any fragrance use by IFRA.
GHS Classification
RIFM Assessment
Not evaluated by RIFM as it has no fragrance applications.
Sustainability
Industrial sulfuric acid production has significant environmental impacts, including sulfur dioxide emissions. However, this is irrelevant to perfumery as the substance has no legitimate use in fragrance creation.
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Perfumers Notes
Odor Threshold
0.15 unknown.
Standard Dilution
10% in DPG (standard dilution for most fragrance materials)
Ingredient Data Sheet
CAS 7664-93-9Physical Properties
| Molecular Weight | 98.08 g/mol🔬 PubChem |
| LogP (Octanol-Water) | -1.4🔬 PubChem |
| Boiling Point | 290 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0075 mmHg @ 25°C📊 OPERA |
| Involatility Index | 0.0008💻 Calculated |
| log Kp (skin permeability) | -4.292💻 Calculated |
| SMILES | OS(=O)(=O)O🔬 PubChem |
Volatility & Performance
| Fragrance Note | Base💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 1.4 / 5💻 Calculated |
Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
Physicochemical Properties
DTXSID: DTXSID5029683
Physical Properties
| Molecular Weight | 98.07 g/mol🔬 EPA CompTox |
| Density | 1.532 g/cm^3🔬 EPA CTX |
| Boiling Point | 299.4 °C🔬 EPA CTX |
| Melting Point | -3.825 °C🔬 EPA CTX |
| Flash Point | 178 °C📊 PubChem |
| Refractive Index | 1.537 Dimensionless📊 OPERA |
| Molar Volume | 44.58 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | -0.653 dimensionless💻 Computed |
| Water Solubility | 10.192 mol/L🔬 EPA CTX |
| Henry's Law Constant | NaN atm-m3/mole🔬 EPA CTX |
Transport Properties
| Vapor Pressure | 0.068 mmHg🔬 EPA CTX |
| Surface Tension | 124.135 dyn/cm📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 74.6 Ų💻 Computed |
| H-Bond Donors | 2 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 0 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 13.925 cm^3/mol📊 OPERA |
| Polarizability | 5.52 Å^3📊 OPERA |
Data Sources:
🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.
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