Glycerin

What is Glycerin?

Molecular Formula (Glycerin):  C ₃ H ₈ O ₃

Molecular Weight:  92.094 g / mol

Chemical Name:  Glycerin

CAS Number:  56-81-5

This chemical is used as an intermediate in carbohydrate and lipid metabolism; it is a trihydroxy sugar alcohol. As a chemical substance, it is a non-standard allergen.

The formula for glycerin is C ₃ H ₈ O ₃.

It is produced from fats. It is obtained from vegetable and animal fats. It is also obtained from petrochemical raw materials. It is also known by the name glycerol.

It acts as a solvent, emollient, and sweetener.

Glycerin is a trihydroxy alcohol with osmotic diuretic and laxative effects. It prevents water absorption in the body. It is a chemical that has the property of causing an increase in water and sodium excretion from the body and a decrease in blood volume.

Pharma grade glycerin is the product that is typically filled into original packaging at the factory and then shipped. Bulk glycerol is the product filled into smaller packages from its original packaging upon arrival at the distribution point.

Glycerin E Code: E422.

Other names for glycerin are as follows:

• 1,2,3-propanetriol
• 56-81-5
• Propane-1,2,3-triol
• Glycyl Alcohol
• Synthetic Glycerol
• Vegetable Glycerol
• Glycerol
• 1,2,3-trihydroxypropane
• Propanetriol
• Polyglycerol
• Glycerol Polymer
• Refined Glycerin
• 1,2,3-trihydroxypropanol
• L-glycerol
• Glycerin USP
• D-glycerol
• Anhydrous Form
• Pharma Form
• Crude Glycerin

How is it Produced?

It is produced by the hydrolysis of solid and liquid fats. The production of glycerol is divided into two classes: organic and inorganic. The production of the organic form is also divided into two classes: Animal and Vegetable glycerol production.

The natural form is produced through fermentation. Therefore, it is an agricultural product. This is called vegetable glycerol.

The most commonly used plant in the method of obtaining this chemical is corn starch.

In the synthetic production process, fatty acids obtained from triglycerides are hydrolyzed. The most important of these methods in the production process are the Lemmens and Fryer process, and the Budde and Robertson process.

In the production process, there is another glycerin production method called continuous high-pressure hydrolysis, which does not require a catalyst. Glycerin has been produced using this method since 1930. Therefore, these methods have been considered synthetic.

Due to better economics and the increasing global demand for glycerol, production via synthetic methods has increased. The acceptance of glycerin production without a catalyst as synthetic is based on the statement that catalyst use is necessary for the hydrolysis of solid and liquid fats.

What are its Physical and Chemical Properties?

Below its melting point of 18 °C, it has a structure that forms solid rhombic crystals.

It is a clear, colorless, syrupy liquid. The unrefined, i.e., unpurified form, is brownish in color.

Its boiling point is 290 °C.

Melting Point: 18.2 °C.

It is described as a chemical with a slight odor and a sweet, warm taste. Its sweetness is about 60% of that of sugarcane.

Its density at 20 °C is 1.26 g/cm³.

Does glycerin dissolve in water?

In terms of solubility, it is soluble in water and ethanol. It is slightly soluble in ethyl ether. And it is insoluble in benzene, carbon tetrachloride, chloroform, carbon disulfide, and petroleum ether.

Properties and Application Areas of Solvent-Based Glycerin (Glycerol)

Studies have recently been conducted to evaluate the applications of glycerin (glycerol) and its derivatives as solvents. It is observed that glycerin (glycerol) is increasingly finding its place in application areas as a solvent-reagent to create a dispersing medium.

Recent developments in the use of glycerin (glycerol) are increasing over time as a reactive distribution application with a wide range of uses. To classify solvents in glycerin methods, physicochemical properties, applied examples, and substitution situations between solvents are important.

Glycerin (glycerol) is a polyol (1,2,3-propanetriol) naturally found in the structures of triglycerides, which are esters of fatty acids. Currently, there are more than 2000 uses for this product. These application areas include the pharmaceutical and cosmetic industries. These include roles as a thickener, humectant, cryoprotectant, lubricant, and sweetener.

Due to the high industrial demand for glycerin (glycerol), chemical conversions have been achieved by synthesizing it from petroleum-derived products. The production quantity obtained from soap and fat production was quantitatively smaller.

With the production of biodiesel in recent years, the use of glycerin (glycerol) has shown an incredible change. Recently, with the demand from biodiesel production, glycerol production has exceeded 2 million tons.

Since 2000, many different studies have been conducted on this topic. Among the most important were applications in the conversion of glycerin (glycerol) into other value-added chemicals such as glycidol, epichlorohydrin, acrolein, and propylene glycol. This means that a non-renewable petroleum-derived chemical is being replaced by a renewable one. This process ultimately shows the conversion of glycerin (glycerol) into olefins like propene and ethylene.

A high-consumption area for the chemical glycerol and its derivatives is also solvent derivatives. These derivative solvents are needed in many application areas such as for their solvent properties and as cleaning agents. Most solvents are toxic and harmful chemicals. Therefore, there is a need for less harmful or harmless solvents. For this reason, the focus has been on solvents evaluated in the non-toxic, green category.

Glycerin (glycerol)-based solvents are grouped into 2 categories

1. Includes classic solvent groups such as esters, acetals, carbonates, and ketals.
2. As the price of glycerol prepared from other sources decreases, we can see solvents that will be competitive. These are; propylene glycol, 3-propanediol, ethyl lactate, and butanol.

Glycerol, a polyol, can dissolve transition metal complexes, including many organic compounds, as a 4S inorganic compound. The immiscibility of glycerin (glycerol) with common organic solvents such as hydrocarbons, esters, and ethers allows for the easy separation of the solute after the reaction. Additionally, its immiscibility with the other phase allows glycerol to be reused in another reaction. This situation is very useful for applications catalyzed by transition metal complexes.

The most known disadvantages of using glycerin (glycerol) as a solvent are its high viscosity and the low solubility of highly hydrophobic compounds. There are several ways to overcome this solubility problem. Either co-solvents are used, or it is overcome by combined methods such as high-intensity ultrasound or microwave activation.

What is the Role of Glycerin in Ear Congestion?

Health problems such as middle ear infections can occur in humans. Middle ear infections can result from issues like blockage and swelling. To alleviate problems causing ear congestion, glycerin ear drops are prescribed by doctors.

Glycerin is a chemical that helps soften the debris causing ear congestion. After application, the debris softens, and the problem causing discomfort may be resolved.

What are its Areas of Use?

• Glycerin, which is 1,2,3-propanetriol, is a simple alcohol with many uses in the cosmetic, paint, automotive, food, tobacco, pharmaceutical, pulp, leather, and textile industries.
• The health sector is among the areas where glycerin is used. Here, it can only be used as an auxiliary chemical.
• It is used in the manufacture of anti-cellulite creams.
• In medical and pharmaceutical preparations, glycerin is used primarily to increase smoothness, provide lubrication, and impart moisturizing properties.
• It is used in the manufacture of suppositories, cough syrups, elixirs, and expectorants.
• It is used with flavoring agents for humidification during the production of hookah tobacco.
• It is used as an auxiliary chemical in personal care products. In this field, glycerin is used as a humectant, solvent, and lubricant.
• It is a chemical substance that competes with sorbitol, despite having a better taste. Its solubility is better than that of sorbitol.
• It is used with Carbomer in the production of ultrasound gel for its lubricating properties.
• It is used in the manufacture of toothpaste, mouthwash, and skin care products.
• An aqueous glycerin solution is used to obtain sorbic acid in granular form.
• It is used extensively in the manufacture of food and beverages. In this field, it is used as a humectant, solvent, and sweetener. It helps in the preservation of foods. It is used as a solvent for sweeteners and food coloring. It is used as a humectant in candies, cakes, and casings. It is used as a softening agent in meats and cheeses.
• Glycerol is used as an emulsifier in the manufacture of mono- and di-glycerides. It is also used in the manufacture of polyglycerin esters. We can consider these as margarine.
• It is used as a filler in the manufacture of low-fat snacks.
• Glycerin is used to produce polyurethane with higher rigidity than the flexible foams used in the manufacture of polyols.
• It is an initiator for propylene oxide and ethylene oxide.
• Glycerin and Sorbitol derivative trihydric alcohols, used as moisture retainers, are used as humectant chemicals with the highest properties in terms of cost and stability.
• In the past, it was used as an antifreeze in automobile radiator systems. Later, after the discovery of monoethylene glycol, it has been used modified with monoethylene glycol and alcohol.
• It is used in surface coatings and in the manufacture of paints. In this field, it is used as a softener and plasticizer to provide flexibility. Its use here provides durability.
• It is used for its moisturizing properties in cosmetic products produced for skin rejuvenation and wrinkle removal.

What are its Other Areas of Use?

• In toothpaste production, it is used with Xanthan Gum, Sodium Bicarbonate, Zinc Lactate, Activated Carbon, Maltodextrin, Sodium Benzoate, and Potassium Sorbate to provide moisturizing and lubricating properties.
• It is a compound that exhibits moisturizing and conditioning properties in the production of roll-on deodorants.
• Its uses include the manufacture of meat casings, collagen casings (medical applications), and non-meat packaging products.
• It is used as a disinfectant lubricant and moisturizing agent.
• Glycerol is used as a moisturizing chemical in the production of wet wipes.
• It is used in the manufacture of baby care and moisturizing creams along with Phenoxyethanol, isopropyl myristate, Hydrogenated Castor Oil (PEG 7).
• Its lubricating properties are utilized when sprayed on the body in the manufacture of mosquito repellent sprays.
• Glycerol, a substance that does not raise blood sugar, is used as a sweetener in the production of diabetic foods.
• Glycerin is used as an auxiliary chemical in the production of mouthwash.
• It is used with paraffin in solid coolants to absorb heat. Menthol and Calcium Hydroxide are also used in this application.
• It is used with Ammonia to obtain a depilatory composition.
• Glycerol is used as a humectant in the production of antiseptic hydrogels.
• Glycerin can be used as a humectant in the production of semi-moist pet food. Additionally, 1,3-Butylene Glycol can also be used.
• In fire extinguishing systems, it is used with Potassium Permanganate to help extinguish fires in chemical combustion events and pyrophoric systems.
• In slime production, it can be used to provide elasticity and smoothness. It also prevents the slime from drying out for a longer period, keeping it elastic.
• Milk yield decreases due to ketosis disorders in dairy cows. To easily provide the energy dairy cows need, their lactation performance must be improved. For this reason, it is used to meet the energy needs of dairy cows.

What Factors Affect Its Price?

Glycerin prices have consistently increased in line with industrial development. The price will increase with the rise in prices of substitute products.

Glycerin spot prices will increase due to insufficient stocking before the summer months.

With the establishment of a new glycerin plant, prices show a short-term decrease, but they will eventually reach a stable level.

The price of glycerin is directly linked to its usage. As its application areas expand, its price will also increase.