What is ethylene glycol ? What is the main purpose?

is the simplest diol.

It is mainly used in the production of polyester, polyester, polyester resin, hygroscopic agent, plasticizer, surfactant, synthetic fiber, cosmetics and explosives, and is used as a solvent for dyes, inks, etc., antifreeze for the preparation of engines, gas dehydrating agent, resin manufacturing, and can also be used as a wetting agent for cellophane, fiber, leather, and adhesives. It can produce synthetic resin PET, fiber grade PET is polyester fiber, bottle flake grade PET is used to make mineral water bottles, etc.

It can also produce alkyd resin, glyoxal, etc., and is also used as an antifreeze. In addition to being used as an antifreeze for automobiles, it is also used for the transportation of industrial cooling capacity, generally called a refrigerant, and can also be used as a condensate like water.

Ethylene glycol should be noted when used as a refrigerant:

The freezing point changes with the change of the concentration of ethylene glycol in the aqueous solution, when the concentration is below 60%, the concentration of ethylene glycol in the aqueous solution increases and the freezing point decreases, but after the concentration exceeds 60%, with the increase of ethylene glycol concentration, its freezing point shows an upward trend, and the viscosity will also increase with the increase of concentration.

When the concentration reaches 99,9%, its freezing point rises to -13,2, which is an important reason why concentrated antifreeze (antifreeze mother liquor) can not be used directly, ethylene glycol contains hydroxyl group, long-term work at 80 degrees Celsius 90 degrees Celsius, ethylene glycol will be oxidized to glycolic acid first, and then oxalized to oxalic acid.

The above content refers to Encyclopedia-Ethylene Glycol.

Ethylene glycolIt is also very widely used and is mainly used in polyester productsAntifreezeAt the same time, it can also be used for lubricants, plasticizers, etcSurfactants, paints, explosives, inks, etc. Among them, polyester products (including:Polyester, polyester film, polyester plastic and others) account for about 90% of ethylene glycol consumption. About 85% of polyester is used in the production of polyester, which in turn is mainly used in textiles and clothing.

Another important consumer area of ethylene glycol is antifreeze, and the demand for antifreeze is closely related to automobile consumption

Production method. Ethylene glycol production routes are mainly divided into: ethylene method and coal-based syngas oxalic acid.

Ester method. The ethylene method can be divided into naphtha cracking to ethylene, ethane cracking to ethylene and MTO to produce methanol according to different ethylene **.

The syngas oxalate method is mostly used in China, and most manufacturers use coal syngas, and a few manufacturers purify the CO in the exhaust gas of calcium carbide furnace as syngas.

According to the data of 2017, ethylene glycol accounted for about 70% in China, and coal-based syngas oxalate accounted for about 30%. Because China's resource structure is poor in oil, less gas and more coal, the coal-based syngas method is regarded as a ethylene glycol production method with Chinese characteristics, and relatively speaking, this method has serious environmental pollution.

Ethylene glycol, commonly known as glycol, has a wide range of uses, can be used to synthesize "polyester" (indeed good) and other polymer compounds, can also be used as films, rubber, plasticizers, desiccants, brake fluids and other raw materials, and is a commonly used high boiling point solvent, the freezing point of 60% of the aqueous solution is -40, so it can be used as an antifreeze for automobile radiators in winter and a refrigerant for aircraft engines. Ethylene glycol can also be used as a wetting agent for cellophane, fibers, leather, and adhesives. The vapor produced by the heating of ethylene glycol can be used as a stage smoke screen, and the automotive antifreeze is the circulating medium used in the cooling system of the automobile engine, and the most commonly used is water.

Water has many advantages, such as: wide, non-toxic, cheap, good thermal conductivity, etc. Water has long been used as a coolant for car engines.

But water has many disadvantages, such as high freezing point, when the air temperature is lower than o, the water freezes and increases the volume, which is easy to cause the water tank or cooling system pipe to expand and crack;The boiling point of water is low, and when the engine is driving under harsh conditions in summer, it will cause the water temperature to rise, or even boil, which will affect the normal driving of the carMetal salts dissolved in water form scale when heated, reducing heat transfer efficiencyWater can also rust the metal. As a result, people have been looking for a new type of coolant to replace water. First of all, the use of aqueous solutions of salt (such as calcium chloride, magnesium chloride, sodium nitrate, sodium nitrite) can reduce the freezing point to below 30, but can not solve the problem of rust.

The use of sugar and honey can also lower the freezing point and does not corrode the metal, but it is expensive and has poor thermal stability. Although the condensation point of kerosene and diesel fuel as coolant is low, it is not used because of poor heat transfer, easy combustion, and swelling effect on rubber. Before and after World War II, methanol and ethanol were used as coolants, although it was cheap and had a low freezing point, it could not be an ideal coolant with low boiling point, volatile and flammable.

Later, it was found that the performance of ethylene glycol aqueous solution is good, the freezing point can reach below -60 in a certain ratio, and the boiling point is above 110, it will not damage the rubber hose, and it will not corrode the metal after adding rust inhibitors, which is relatively cheap and has no unpleasant smell. Therefore, this liquid is widely used as a circulating medium for automobile cooling systems, called automotive antifreeze.

Ethylene glycol has a wide range of uses, such as simple organic solvents, resin plasticizers, and synthetic polyester resins and polyurethane resins. It can also be used as resin oligomers as raw materials for resin synthesis, resin curing agent, crosslinking agent, etc. It is a very important raw material in the industry.

Ethylene glycol is widely used, mainly used to produce high-quality polyester resin, and can also be used as raw materials such as films, rubber, alkyd resins, plasticizers, antifreeze, solvents, desiccant, brake fluids, etc.

Ethylene glycol is divided into polyester grade and industrial grade, polyester grade ethylene glycol content reaches, industrial grade ethylene glycol general content 98, the quality is also quite good, do antifreeze and pipeline refrigeration, air conditioning add special.

It can be used to add a certain amount of fuel in the kitchen to increase the freezing point.

Chinese name. Ethylene glycol

EINECs Login Number.

English name. ethylene

glycol

Alias. Glycol.

Molecular formula. c2h6o2;HOCH2CH20H molecular weight.

Melting point. Boiling Point:

Density. relative density (water = 1); Relative density (air = 1).

Appearance and character.

Colorless, odorless, sweet, viscous liquid.

Vapour pressure. Flash Point: 110

Solubility. It is miscible with water and can be miscible in ethanol, ether, etc.

Stability. Stable.

Main uses: It is used in the manufacture of resins, plasticizers, synthetic fibers, cosmetics and explosives, and as a solvent, antifreeze agent for the preparation of engines.

Health hazards. Invasion route: inhalation, ingestion, transdermal absorption.

Health hazards: There are no reports of acute and chronic poisoning in China. Acute poisoning abroad is mostly due to false alarms.

Inhalation poisoning manifests as reflux fainting, nystagmus, and lymphocytosis. Acute poisoning after oral administration is divided into three stages: the first stage is mainly central nervous system symptoms, mild cases resemble ethanol poisoning, severe cases quickly produce coma convulsions, and finally death; In the second stage, the cardiopulmonary symptoms are obvious, and severe cases may include pulmonary edema, bronchopneumonia, and heart failure; The third stage is mainly manifested by varying degrees of renal failure.

The lethal dose of this product for humans is estimated to be oral at one time.

First aid measures. **Contact: Remove contaminated clothing and rinse with plenty of running water. Eye contact: Lift the eyelid and rinse with running water or saline. Medical treatment.

Inhalation: Quickly remove from the scene to fresh air. Keep your airways open. If you have difficulty breathing, give oxygen. If breathing stops, artificial respiration is performed immediately. Medical treatment.

Intake: Drink plenty of warm water to induce vomiting. Gastric lavage, catharsis. Medical treatment.

Toxicological data and environmental behavior.

Toxicity: It is a low toxicity category.

Acute toxicity: mouse oral); rat oral); People pass orally, to death)

Subacute and chronic toxicity: corneal opacity and blindness in 2 15 animals after eight days of inhalation of 12 mg m3 (multiple times in a row) in rats; People inhaled a mixture of 40% ethylene glycol9 28 people experienced transient fainting; People inhaled a mixture of 40% ethylene glycol heated to 105 repeated inhalation14 38 people with nystagmus, 5 38 people with lymphocytosis.

Hazard characteristics: In case of open flame, high heat or contact with oxidant, there is a risk of combustion**. In case of high heat, the internal pressure of the container increases, and there is a risk of cracking and **.

Combustion (decomposition) products: carbon monoxide, carbon dioxide, water.

Ethylene glycol is mainly used in the manufacture of polyester, polyester, polyester resin, moisture absorbers, plasticizers, surfactants, synthetic fibers, cosmetics, etc. It can also be used as a solvent for dyes, inks, etc. It is used in the preparation of engine antifreeze, gas dehydrating agent, manufacturing resin, and as a wetting agent for cellophane, fiber, leather and adhesive.

It can produce synthetic resin PET, fiber grade PET is polyester fiber, bottle grade PET is used to make mineral water bottles, etc. It can also produce alkyd resin, glyoxal, etc. , which can also be used as an antifreeze.

In addition to being used as an antifreeze for automobiles, it is also used for the transportation of industrial cold energy, which is generally called a refrigerant. It can also be used as a condensate like water.

Ethylene glycol is also known as ethylene glycol, ethylene glycol, and EG for short. The chemical formula is (CH2OH)2 and is the simplest diol.

Ethylene glycol is a colorless, tasteless, sweet liquid with low toxicity to animals. Ethylene glycol is miscible with water and acetone, but it has little solubility in ether. It is used as a solvent, antifreeze and raw material for synthetic polyester.

Polyethylene glycol (PEG), a polymer of ethylene glycol, is a phase transfer catalyst that is also used in cell fusion.

Ethylene glycol methyl ether series products are high-grade organic solvents with excellent performance. It is used as a solvent and thinner for printing inks, industrial cleaning agents, coatings (nitro paint, varnish, enamel), copper clad laminates, printing and dyeing, etc.

Ethylene glycol is also known as glycol, 1,2-ethylene glycol, referred to as EG. The chemical formula is (CH2OH)2, which is the simplest megagrade diol. Ethylene glycol is a colorless, odorless, sweet liquid, low toxicity to animals, ethylene glycol can be miscible with water and acetone, but the solubility is less in ethers.

It is used as a solvent, antifreeze and raw material for synthetic polyester. Polyethylene glycol, a polymer of ethylene glycol, is a phase transfer catalyst that is also used for cell fusion; Its nitrate is a kind of explosive drug.

The main ingredient of antifreeze.