Industrial Uses of Methyl Cyanide (Acetonitrile)
Methyl cyanide, also known as acetonitrile or MeCN, is a polar aprotic solvent used in chemical synthesis, pharmaceutical manufacturing, analytical testing, and selected industrial separation processes. Its molecular formula is C₂H₃N, and its CAS number is 75-05-8. Understanding its solvent properties, industrial applications, and boiling point helps users assess its suitability for different processes.
What Is Methyl Cyanide?
Methyl cyanide is the common name for acetonitrile, the simplest organic nitrile. It is a colorless liquid that is miscible with water and many organic solvents. Its polarity and solvent properties make it useful in applications where a suitable polar aprotic solvent is required.
Key identification and physical data include:
| Property | Value |
|---|---|
| Chemical name | Acetonitrile |
| Other name | Methyl cyanide |
| Common abbreviation | MeCN |
| CAS number | 75-05-8 |
| Molecular formula | C₂H₃N |
| Molecular weight | Approximately 41.05 g/mol |
| Appearance | Colorless liquid |
| Normal boiling point | Approximately 81.6°C at 760 mmHg |
| Density | Approximately 0.786 g/mL at 20°C |
These are reference values for the chemical substance, not a substitute for the specification of a particular commercial grade.
What Are the Industrial Uses of Methyl Cyanide?
Acetonitrile, also known as methyl cyanide or MeCN, is a polar aprotic solvent used in pharmaceutical manufacturing, chemical synthesis, analytical testing, and industrial separation processes. Its main acetonitrile uses depend on its solvent properties, compatibility with other substances, and the purity requirements of the application. Common acetonitrile applications include HPLC analysis, protein sample preparation, and selected chemical production processes.
1. Pharmaceutical Manufacturing and Chemical Synthesis
Acetonitrile is used as a solvent or reaction medium in pharmaceutical manufacturing and organic synthesis. It supports processes that require a polar aprotic solvent, although the appropriate grade and impurity limits depend on the specific process. Buyers should confirm the required specifications before selecting acetonitrile for pharmaceutical or chemical production.
2. Analytical Testing, HPLC, and Protein Precipitation
Acetonitrile is widely used as a mobile-phase solvent in high-performance liquid chromatography (HPLC). Acetonitrile used in HPLC can help separate compounds during analytical testing, with solvent grade and impurity limits selected according to the method requirements.
Acetonitrile is also used for protein precipitation during sample preparation in applications such as proteomics and bioanalysis. Adding acetonitrile under appropriate conditions can reduce protein solubility, allowing proteins to precipitate before the sample is analyzed. The procedure depends on the sample matrix and analytical method, so solvent ratio and preparation conditions should be validated for the intended application.
3. Butadiene Extraction and Industrial Separation
Acetonitrile can be used as a selective solvent for butadiene extraction from hydrocarbon mixtures. Its role in these processes depends on the separation system and operating conditions, which should be evaluated for the intended industrial application.
4. Other Industrial Solvent Applications
Other acetonitrile applications may include selected chemical processing and specialty solvent uses where its polarity and volatility are suitable. It is not automatically interchangeable with other solvents; compatibility, safety requirements, and product specifications should be assessed for each process.
What Is the Boiling Point of MeCN?
The normal boiling point of MeCN (acetonitrile or methyl cyanide) is approximately 81.6°C (178.9°F) at 760 mmHg, equivalent to standard atmospheric pressure. This property is relevant to solvent recovery, distillation, evaporation control, and process design.
The actual boiling temperature changes with pressure. In addition, mixtures containing water or other solvents may boil at temperatures different from those of pure acetonitrile. For process calculations, use the applicable pressure and mixture data rather than relying only on the normal boiling point.
What Should Buyers Check When Sourcing Acetonitrile?
Before purchasing acetonitrile, buyers should confirm the intended application, required grade, purity limits, and any relevant impurity specifications. Laboratory and HPLC applications may have different requirements from industrial solvent use.
The quotation should also clarify the requested quantity, packaging, destination, and applicable shipping requirements. Request the current product specification and safety documentation to evaluate whether the offered material is suitable for the intended use.
Safety and Handling
Acetonitrile is a flammable and toxic chemical. Handling, storage, ventilation, personal protective equipment, and transport arrangements should follow the current product-specific Safety Data Sheet (SDS) and applicable regulations.
Frequently Asked Questions
Is methyl cyanide the same as acetonitrile?
Yes. Methyl cyanide is another name for acetonitrile, commonly abbreviated as MeCN. Its CAS number is 75-05-8.
What is the boiling point of MeCN?
The normal boiling point of pure acetonitrile is approximately 81.6°C (178.9°F) at 760 mmHg. The boiling temperature varies with pressure and mixture composition.
What is methyl cyanide used for?
Methyl cyanide is used as a solvent in pharmaceutical manufacturing, chemical synthesis, HPLC analysis, and selected industrial separation processes, including butadiene extraction.
What is the molecular formula of methyl cyanide?
The molecular formula of methyl cyanide is C₂H₃N, and its molecular weight is approximately 41.05 g/mol.
