N HEPTANE

n-Heptane is a straight-chain alkane hydrocarbon with seven carbon atoms. 
It is a colorless, volatile, and flammable liquid with a mild gasoline-like odor. 
It occurs naturally in crude oil and is commonly used in laboratories and industries as a non-polar solvent, a reference fuel in octane rating, and in chemical synthesis.
CAS Number:
142-82-5
Synonyms:
Heptane,n-Heptan,Dipropylmethane,Heptan (German),n-Heptano,Heptano normal,N-heptanum

Introduction

N-Heptane, also known as heptane or normal heptane, is a straight-chain alkane with the molecular formula C7H16. 
As a saturated hydrocarbon, it consists solely of hydrogen and carbon atoms arranged in a linear structure. 
Heptane is one of several isomers that share this molecular formula but differ in structural arrangement. 
It is a colorless, volatile liquid with a characteristic gasoline-like odor. 
N-Heptane is widely used in laboratories, industry, and the petroleum sector due to its well-defined properties.

The name heptane is derived from "hepta," the Greek word for seven, indicating the number of carbon atoms in its molecular structure. 
N-Heptane is most notably used as a reference fuel in octane rating scales, where it represents the zero point on the anti-knock index.

Historically, n-heptane was first isolated from petroleum and has since become an important compound in both theoretical and applied chemistry. 
It occurs naturally in crude oil and is a component of gasoline.

Chemical Structure and Properties
Molecular Formula: C7H16
Molecular Weight: 100.20 g/mol
Chemical Structure: CH3(CH2)5CH3
N-Heptane belongs to the family of alkanes, characterized by single bonds between carbon atoms. 
It is an unbranched, saturated hydrocarbon.
Isomerism: There are nine structural isomers of heptane, including isoheptane and 3-methylhexane. N-Heptane is the straight-chain isomer.

Physical Properties:
Boiling Point: 98.4 °C
Melting Point: -90.6 °C
Density: 0.684 g/mL at 20 °C
Refractive Index: 1.3876 at 20 °C
Vapor Pressure: 45 mmHg at 25 °C
Flash Point: -4 °C (closed cup)

Chemical Properties:
Combustible with a high heat of combustion
Inert under normal conditions but reacts with strong oxidizers
Undergoes free-radical halogenation
Exhibits low reactivity due to saturated bonds

Synthesis and Production
N-Heptane is primarily obtained through the fractional distillation of crude oil. 
The petroleum refining process separates hydrocarbons by boiling point, and heptane is collected in the light naphtha fraction.

Industrial Production Methods:
Petroleum Distillation: Crude oil is separated into fractions, with heptane isolated in the naphtha range.
Hydrocracking and Reforming: Used to enhance yield and purity of n-heptane from mixed hydrocarbon streams.
Laboratory Synthesis:
Although not commonly synthesized in the lab due to availability, n-heptane can be produced by catalytic hydrogenation of heptenes or reduction of heptanoic acid derivatives.
Natural Sources:
Found in various crude oil samples
Occurs in certain plant oils in minor amounts

Analytical Methods
Accurate identification and quantification of n-heptane are essential in fuel analysis, quality control, and environmental monitoring.
Gas Chromatography (GC):
Most common technique for separation and quantification
Retention time and peak area used for identification
Mass Spectrometry (MS):
Used alongside GC for structural confirmation
Detects characteristic fragmentation pattern
Infrared Spectroscopy (IR):
Shows absorption bands for C-H stretching and bending
Identifies alkane-specific fingerprints
Nuclear Magnetic Resonance (NMR):
1H and 13C NMR provide detailed structural information
Useful for distinguishing between isomers
Purity Determination:
Determined by GC or HPLC techniques
Also involves boiling point and refractive index measurements

Applications
Fuel Research:
Standard reference for octane rating
Used to simulate low-octane behavior in engine testing
Solvent Applications:
Used in laboratories as a non-polar solvent
Cleans and dissolves oils, waxes, and greases
Chemical Industry:
Used in extraction processes
Involved in polymer production and formulation
Pharmaceuticals:
Employed in drug formulation studies as a carrier or solvent
Paints and Coatings:
Serves as a solvent in paint thinners and varnishes

SAFETY INFORMATION ABOUT N HEPTANE

First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product