N-hexane, a straight-chain alkane with the chemical formula C₆H₁₄, is a crucial industrial solvent with a wide range of applications. As a trusted N-hexane supplier, I am well - versed in its physical properties, which play a significant role in determining its uses across various industries.
1. Physical State and Appearance
Under standard conditions (temperature of 25°C and pressure of 1 atm), N-hexane exists as a colorless liquid. Its clear and transparent appearance is characteristic of many organic solvents. This lack of color is beneficial in applications where the presence of a colored impurity could interfere with the end - product quality. For example, in the extraction of vegetable oils, a colorless solvent like N - hexane ensures that the extracted oil remains pure and free from any unwanted discoloration.
2. Boiling Point and Melting Point
The boiling point of N - hexane is approximately 68.7°C. This relatively low boiling point makes it easy to vaporize, which is highly advantageous in processes such as distillation and evaporation. In industrial settings, the ability to vaporize N - hexane at a relatively low temperature reduces energy consumption and processing time. For instance, in the production of rubber adhesives, N - hexane is used as a solvent. After the adhesive has been applied, the low boiling point allows the N - hexane to evaporate quickly, leaving behind a dry and effective adhesive.
The melting point of N - hexane is around - 95°C. This low melting point means that N - hexane remains in a liquid state over a wide range of temperatures commonly encountered in industrial and laboratory environments. It can be used in cold - climate regions without the risk of solidification, ensuring continuous and reliable operation in various processes.
3. Density
The density of N - hexane is about 0.659 g/cm³ at 20°C. This relatively low density compared to water (1 g/cm³) causes N - hexane to float on water. In cases of accidental spills, this property can be useful for containment and cleanup. Specialized skimming equipment can be used to remove the floating N - hexane layer from the water surface. Moreover, in liquid - liquid extraction processes, the difference in density between N - hexane and other solvents or aqueous phases allows for easy separation of the phases, facilitating the isolation of the desired compounds.
4. Solubility
N - hexane is highly soluble in non - polar solvents such as other hydrocarbons (e.g., benzene, toluene) and chloroform. This solubility is due to the similar non - polar nature of these substances, following the principle of "like dissolves like." In the chemical industry, this property is exploited in the synthesis of various organic compounds. For example, in the production of certain pharmaceuticals, N - hexane can be used as a co - solvent with other non - polar solvents to dissolve reactants and facilitate chemical reactions.
On the other hand, N - hexane has very low solubility in water. The non - polar nature of N - hexane makes it immiscible with the polar water molecules. This immiscibility is important in extraction processes where N - hexane can be used to extract non - polar compounds from an aqueous solution. For instance, in the extraction of fatty acids from biological samples, N - hexane can be added to the aqueous sample. The fatty acids, being non - polar, will partition into the N - hexane phase, which can then be separated from the water phase.
5. Vapor Pressure
N - hexane has a relatively high vapor pressure at room temperature. At 20°C, its vapor pressure is approximately 121 mmHg. This high vapor pressure means that N - hexane readily evaporates into the air. In industrial workplaces, proper ventilation is essential to prevent the accumulation of N - hexane vapors, which can be a fire and explosion hazard as well as a health risk.
However, the high vapor pressure also has its advantages. In the printing industry, N - hexane is used as a solvent in ink formulations. The rapid evaporation of N - hexane allows the ink to dry quickly on the printed surface, improving the production efficiency of printed materials.
6. Flash Point and Flammability
The flash point of N - hexane is - 22°C, which is quite low. A low flash point indicates that N - hexane can ignite easily when exposed to an ignition source such as a spark or an open flame. It is classified as a highly flammable liquid. In industrial facilities where N - hexane is used, strict safety measures must be in place to prevent fires and explosions. This includes the use of explosion - proof equipment, proper grounding to prevent static electricity buildup, and the implementation of strict smoking and open - flame policies.
7. Refractive Index
The refractive index of N - hexane is about 1.375 at 20°C. The refractive index is a measure of how much light is bent when it passes through a substance. In analytical chemistry, the refractive index can be used to identify and characterize N - hexane and to determine its purity. A change in the refractive index may indicate the presence of impurities in the N - hexane sample.
Applications Related to Physical Properties
The physical properties of N - hexane make it suitable for a variety of applications. In the oil and gas industry, its low boiling point and good solubility in non - polar substances make it an ideal solvent for extracting crude oil from oil - bearing rocks. In the food industry, it is used for the extraction of vegetable oils from seeds such as soybeans and peanuts. The low boiling point allows for easy removal of the solvent from the extracted oil, ensuring that the final product is safe for consumption.
In the electronics industry, N - hexane is used for cleaning electronic components. Its low viscosity and high volatility enable it to quickly penetrate into small spaces and remove contaminants, leaving behind a clean and dry surface.
Related Products and Links
If you are interested in related products, you might want to explore Cyclohexane – Vapor Degreasing Solvent For Metal Surface Treatment and Cyclohexane – Polymer Grade Solvent For High - Performance Polyolefins. Another related product is Epichlorohydrin, which has its own unique set of applications in the chemical industry.
Contact for Procurement
If you are in need of high - quality N - hexane for your industrial or laboratory applications, I encourage you to reach out for a procurement discussion. Our team of experts can provide you with detailed information about our product offerings, pricing, and delivery options. We are committed to providing reliable and cost - effective solutions to meet your specific needs.
References
- "The Properties and Reactions of Alkanes." Organic Chemistry textbook, 3rd Edition.
- Industrial Solvents Handbook, 5th Edition, which contains comprehensive data on the physical properties of various solvents including N - hexane.
- Safety Data Sheets (SDS) of N - hexane provided by chemical manufacturers, which offer detailed information on its physical and chemical properties as well as safety guidelines.