What is ethanol?
Ethyl alcohol or ethanol is a simple alcohol with the chemical formula C2H6O or CH3CH2OH or C2F5OH. Ethyl alcohol is a compound with a specific odor that is flammable and combustible. It is colorless and transparent, and breathing ethanol causes coughing and headaches.
Ethanol is found in alcoholic beverages in varying percentages. It is an edible alcohol that is used recreationally. A psychoactive substance that affects the human nervous system and brain in high concentrations, altering consciousness and the mind, and also affecting cognition and perception. It is also called alcohol, ethyl alcohol or edible alcohol.
Because ethanol has a low freezing point, it is used in the ice-making industry. Due to its high solubility, ethanol is used in the perfumery and dyeing industries. It is noteworthy that ethanol solutions with a percentage of 70 to 85 percent are used as disinfectants, in such a way that it changes proteins and dissolves fats, then destroys microorganisms, and this action only affects microbes, viruses, and fungi.
ethanol (ethyl alcohol) has long been known to humanity and was mostly produced through the fermentation of fruit juices. Many sources can produce sugars and starches that are broken down into simpler compounds during fermentation.
Ethanol is also called grain alcohol because it is often made from grains such as corn, wheat, and barley. This substance was first isolated by Jaber ibn Hayyan, who popularized the distillation industry. However, it is believed that pure alcohol was produced by Muhammad ibn Zakaria al-Razi.
Alcohol quickly absorbs water from the air and mixes easily with most organic liquids.
Chemical Properties of Ethanol
At room temperature, alcohol is always a liquid and has a melting point of 114.5°C and a boiling point of 78.3°C
Melting point: -114.5°C
Boiling point: 78.3°C
Specific gravity: 0.8
Flash point: 9-11°C
Ethanol Use
Industry
Because alcohol can be easily dissolved in water and other organic compounds, it is an ingredient in a wide range of products including personal care and beauty products, paints, varnishes, and fuel.
In personal care products, ethanol can be used as an astringent and preservative. It is used as a solvent in some household products including paint. Most gasoline in the United States contains alcohol and is used to enhance the performance of vehicles.
As a food additive, ethanol is used to evenly distribute food coloring and enhance the flavor of food extracts.
In the cosmetics and beauty products industry, alcohol is a common ingredient when it comes to lotions as a preservative to help the skin.
It is used as a preservative in paints because it is an effective solvent and is also used in cleaning products to prevent the penetration of organisms.
It is used as a paint additive and is also used for better flavor and aroma
It is used in gasoline to prevent knocking in engines and maintain drivability.
Medical
Alcohol is used in medical wipes, gels and hand sanitizers to kill viruses and bacteria and fungi.
Ethanol is ineffective against bacterial spores, but it can be reduced by using hydrogen peroxide. For disinfection, 70% alcohol is more effective than high-concentration pure alcohol at high concentrations. This is because ethanol depends on water for its activity against microbes. Pure alcohol may inactivate microbes and fail to kill them because ethanol cannot penetrate the microbial membrane. Ethanol can also be used as an antidote for methanol poisoning.
High-concentration ethanol is used to dissolve many water-soluble drugs and compounds of interest. Such as cough and cold syrups and mouthwashes. Which may contain 25% alcohol. It should be considered that people who have respiratory allergies caused by ethanol should avoid taking these drugs.
In many drugs, alcohol is used as an antimicrobial preservative, including acetaminophen, ranitidine, furosemide, and …
Alcohol Symptoms and Side Effects (Drinking Side Effects)
Symptoms of alcohol exposure may include irritation of the eyes, skin, and nose, drowsiness, and headache. Other symptoms may include lethargy, nausea, mental agitation or depression, vomiting, flushing, and coma.
Exposure to high concentrations of ethanol vapors may cause irritation of the eyes, skin, and respiratory tract, loss of coordination (ataxia), drowsiness, narcosis (numbness or unconsciousness), impaired perception, and incoordination. It can also cause dizziness, shallow breathing, unconsciousness, and death.
Alcohol is harmful if swallowed, inhaled, or absorbed through the skin.
Repeated exposure can cause skin dryness, resulting in cracking, peeling, and itching.
Ethanol can irritate the central nervous system, eyes, and upper respiratory tract (nose and throat). Alcohol can also cause agitation, headache, fatigue, and loss of concentration.
Alcohol consumption during pregnancy may affect the fetus, leading to spontaneous abortion, developmental problems, or birth defects. This condition is known as “fetal alcohol syndrome.” Chronic use of ethanol can cause cirrhosis of the liver and affect the nervous system and glands in humans. Alcohol may cause mutations (genetic changes).
How are living things affected by alcohol?
Metabolic processes slow down after consuming a large amount of alcohol, and also depress the central nervous system. This process ultimately leads to decreased coordination, drowsiness, etc. Just like ethanol, methanol can be fatal when consumed in small amounts. When methanol reaches the liver, it is oxidized and converted to methanol.
Methanol reacts rapidly with the cells of the human body and causes coagulation of protoplasm. In order to prevent the misuse of alcohol in industries, a toxic substance such as methanol is added to it, which makes it unfit for drinking. Adding methanol to ethanol to make it unfit for drinking is called denature.
Ethanol Production
Henry Ford and Alexander Graham Bell were among the first to recognize that the abundant sugars found in plants could be easily and cheaply converted into clean, renewable alcohol fuels. Today, advanced renewable fuel refineries use state-of-the-art technologies to convert grains, beverage and food waste, cellulosic biomass, and other products known as feedstocks into high-yield ethanol.
More than 90 percent of grain ethanol produced is produced through the dry milling process, with the remainder produced by wet milling, with the difference between the two processes being the initial treatment of the grain.
Dry Mill Ethanol Process
Most starch-based ethanol production takes place in the United States. In dry milling, the whole kernel of the grain is first ground into a meal, then slurried with water to create a slurry. Enzymes are added to the corn to convert the starch into sugar. The corn is cooked, cooled, and transferred to a fermenter. Yeast is added at this stage, and the conversion of sugar to alcohol begins.
Wet Mill Ethanol Process
In wet milling, the grain is first separated into its primary components by soaking. After crushing, the slurry is processed through a mill to remove the corn germ. The remaining fiber, gluten, and starchy constituents are further separated, except for the gluten, which is filtered and separated for animal feed. The remaining starch can then be processed using a process similar to the dry milling process.
Ethanol Production from Cellulosic Biomass
Cellulosic biomass is the structural part of plants, including complex sugars that cannot be used directly for food or fermentation substrates. According to the U.S. Department of Energy (EERE Biomass Program 2012), cellulosic biomass can be obtained from a variety of sources, such as:
Agricultural residues (corn kernels, sugarcane bagasse, spent sugar beet pulp, and sweet sorghum, etc.)
Forest residues (fallen branches, leaves, twigs, dust, etc.) Municipal solid waste (paper and cardboard products) Industrial waste (papermaking sludge) Agricultural feedstocks grown as energy crops (herbaceous and woody plants, including turfgrasses, mixed spruce trees, and Lucena plants, etc.)
Bioethanol
Bioethanol (ethanol fuel, derived from renewable biomass) has many advantages over fossil fuels: it is renewable and environmentally friendly, which allows for lower greenhouse gas emissions and no CO2 emissions. It has better engine performance due to its higher octane number.
The cellulosic bioethanol process consists of four steps: 1) pretreatment, 2) enzyme hydrolysis, 3) fermentation, and 4) distillation.
ethanol fuel
Human energy sources include fossil, nuclear and renewable, with the most use of fossil resources, which causes a lot of environmental damage and overheats the earth and produces greenhouse gases. The damage caused cannot be compensated and leaves harmful and toxic waste, and it is important to pay attention to the limited availability of fossil fuels.
But in relation to nuclear energy, it is said that excessive costs are spent on energy production and it is not cost-effective. Uranium resources are also limited and non-recyclable. And that nuclear waste remains in nature for many years and is radioactive and dangerous. Another disadvantage of nuclear fuels is the cost of landfilling waste.
As a result, a more sustainable and economical source should be sought that can be a good alternative. Resources that are renewable and cost-effective and do not leave destructive effects.
Alcohol as an alternative fuel
Alcohol as an alternative fuel can be obtained from grains. In the United States and Brazil, we see the use of ethanol fuel, and for this reason, many farmers in the United States grow corn to produce alcohol. The United States has considered ethanol as an alternative fuel to meet its need for oil, and because grains can be cultivated, alcohol is known as a renewable fuel. Ethanol fuel leaves carbon dioxide and water in the air, and benzene can be produced by mixing alcohol and gasoline.
CH3CH2OH + 3O2 → 2CO2 + 3H2O
Alcohol is a common ingredient in everyday life and is now also used as a fuel in transportation. The most common use of ethanol is as a fuel in some engines and as an additive in the fuel industry. The United States uses E10 gasoline/alcohol blends for conventional gasoline-powered vehicles and E85 for flexible-fuel vehicles.
Alcohol and Emissions
Ethanol fuel reduces emissions. However, the energy content of alcohol is approximately 33 percent lower than that of gasoline. If you use a gasoline/ethanol blend E10 instead of pure gasoline, your mileage may be reduced by 3.3% (EIA 2012). Blending must be done very carefully and is usually done locally.
If there is a leak in underground pipes, the alcohol readily absorbs water. It can also absorb water vapor if there is a loose seal. Water does not mix with oil, and phase separation occurs. The production of ethanol as a fuel from inedible and readily available cellulosic biomass offers an important opportunity for the sustainable production of alternative fuels. This would be very beneficial economically and environmentally. Although significant progress has been made in reducing production costs, widespread commercialization of the technology has not been achieved.
Alcohol and the Economy
Before bioethanol can become an economical option for transportation fuel, there must be more efficient pretreatment methods, further reductions in the cost of biological enzymes, and the development of more efficient genetically engineered microorganisms. The biofuels industry also needs ways to combine integrated production technologies and produce value-added by-products.
Brazil is heavily dependent on ethanol as a motor fuel. As a result, it is one of the world’s leading producers. The alcohol produced in Brazil is based on sugar cane. Ethanol is also used as a rocket fuel. Ethanol fireplaces are also used for home heating.
Alcohol concentration
The concentration of ethanol depends on its use and application. Common concentrations of alcohol on the market are as follows:
Ethanol 70%, Ethanol 95%, Ethanol 100%
The most commonly used type is Ethanol 70%, which is used for disinfection.
