Glycol

www.chem.com.ua

e-mail: sales@chem.com.ua

Tel: +38 044-228-08-72

Tel: +38 098-882-15-15

 

Propylene glycol

 

Propylene glycol - colorless viscous liquid with a faint characteristic odor, sweet taste, possessing hygroscopic properties.

Main properties

1,2-propylene glycol - transparent viscous liquid. Its density is lower than that of ethylene glycol and glycerol, but higher than that of ethanol. Viscosity propilenglikole higher than in etilenglikolja and Monohydric alcohols, especially at low temperatures.

 

Solubility

Propylene glycol is a good solvent for different class of compounds. With it fully mixed most low molecular weight organic compounds containing oxygen and nitrogen:

• Monohydric alcohols (methyl, ethyl, profilowe, isopropyl, n-butyl, n-amyl, phenylethyl, etc.)

• ethylene and propylene glycol and their esters

• acids (acetic, detractive, valeric, etc.)

• aldehyde (anisic, benzoic, mustard, salicylic, furfural, citral) and ketones (acetone, α-ionon, metildopoy and metilsalicilata)

• esters (ethyl-, Millor-, n-butyl, amyl and Tamilnet, tri-n-butleft, n-butyl lactone, etc.)

• amines and other nitrogen containing compounds (ethanol and diethanolamine, Di-sapropels, di-n-butilen, di-n-amlan, α-methylbenzylamine, α-methylbenzylamine, 2-phenylethylamine, declention, Triethylenetetramine, pyridine, dimethylformamide, n-Ameland, etc.).

 

Chemical properties

Propylene glycol known in the form of two isomers: 1,2-propylene glycol and 1,3 propylene glycol. 1,3-Propylene glycol reaktsiooni more than 1,2-propylene glycol, and prone to polymerization.

Due the presence of an asymmetric carbon atom there are two optical isomers: one that rotates the plane of polarized light to the left (-) - form and the other to the right (+) - form. Propylene glycol produced in industry by the hydration of propylene oxide, is a racemic mixture of both optical isomers (racemate).

Optical propilenglikole isomers can be obtained from left - and pravoberezhe oxide propylene. In addition, goobertay get when you restore foobarfoo ester of lactic acid, and pravoberezhe - in the hydrogenation over Nickel foobarfoo 3-iodine-1,2-propylene glycol.

For chemical properties of 1,2-propylene glycol is a typical glycol. With alkaline metals and alkalis forms glycolate, carboxylic acids and anhydrides - one twosome and esters; esterification of 1,2-propylene glycol and moneer leads to DEFRA. In the dehydration in the presence of acids or alkalis 1,2-propylene glycol forms a mixture of dimethyl-1,4-dioxane, in the presence of Н3РО4 at 250 ° C-propanoli aldehyde, in the presence АlРО4 - etilovogo alcohol (2-propen-1-ol) CH2 = CH-CH2-OH and acetone. Catalytic Degdekan 1,2-propylene glycol formed acetal CH3-CO-CH 2-Oh or propanone aldehyde, propionic acid, methylglyoxal, etc. In the process of oxidation 1,2-propylene glycol reaction products are acetone, propanone aldehyde, lactic acid, formaldehyde, acetaldehyde, etc.

Getting propylene glycol is by hydration of propylene oxide at a temperature from 160 to 200 degrees and at a pressure of about 1.6 MPa. This releases 85.5% of propylene glycol, 13% dobropolugol and 1.5% tripropellant. Allocate glycols in the vacuum distillation column.

Warranty the product shelf life is one year from the date of manufacture. Food propylene glycol is stored for about two years. In the process of operation should not be to forget that overheating solutions containing propylene glycol, begins decomposition bases and additives, so maybe the deterioration of the thermal properties of the solution.

 

1,2-Propylene glycol apply

• the production of unsaturated polyester resins (for construction industry and the production of cars), elastic polyurethanes, alkyd resins;

• how solvent of natural and synthetic substances in the preparation of ointments, pastes, creams, shampoos etc.

• the pharmaceutical and cosmetic industry;

• the food industry as a solvent for food additives and tobacco humidifier.

1,2-Propylene glycol it has a mild preservative and antibacterial properties;

• disinfection in the food industry (sprayed in the air in aerosol form);

• the manufacture of brake fluids, antifreeze and coolants;

• as a plasticizer in the manufacture of cellophane and polyvinyl chloride films;

• smoke machines to create visual effects at concerts, variety shows, film;

• connection with the replacement of ethylene glycol ethers are less toxic compounds increases the use of esters of 1,2-propylene glycol;

In the food industry propylene glycol is registered as food supplements E1520 as volotskoi, softening and dispersai agent. The Additive E1520 (propylene glycol) approved for use in most countries of the world.

Propylene glycol transporterowych in barrels of all types of transport. Bulk transpor