Dipropylene glycols
The dipropylene glycols (or oxydipropanols) form a group of substances that is derived from the glycol ether . The technical product of the same name (in the singular) is a mixture of three structural isomers.
properties
Dipropylene glycol is a colorless, hygroscopic, viscous, odorless and not very volatile liquid.
| Dipropylene glycols | |||||
| Surname | 2,2'-oxydi-1-propanol | 1,1'-oxydi-2-propanol | 2- (2-hydroxypropoxy) -1-propanol | ||
| Structural formula |
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-1-propanol.svg)
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| CAS number | 108-61-2 | 110-98-5 | 106-62-7 | ||
| 25265-71-8 (mixture of isomers) | |||||
| PubChem | 92739 | 8087 | 32881 | ||
| Molecular formula | C 6 H 14 O 3 | ||||
| Molar mass | 134.2 g mol −1 | ||||
| Physical state | liquid | ||||
| Brief description | colorless, hygroscopic, almost odorless liquid |
colorless, hygroscopic, almost odorless liquid |
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| Melting point | −32 ° C | −40 ° C | |||
| boiling point | 231 ° C | 228-236 ° C | |||
| density | 1.02 g cm −3 | 1.021-1.025 g · cm -3 | |||
| solubility | miscible with water | miscible with water | |||
| Vapor pressure | 0.01 h Pa (20 ° C) | 1.28 Pa (20 ° C) | |||
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GHS labeling |
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| H-phrases | no H-phrases | no H-phrases | |||
| P-phrases | no P-phrases | no P-phrases | |||
| Toxicological data | 14,900 mg kg −1 ( LD 50 , rat , oral ) | 14,900 mg kg −1 ( LD 50 , rat , oral ) | |||
Extraction and manufacture
Dipropylene glycols are by-products that are formed in the production of 1,2-propanediol from 2-methyloxirane ( propylene oxide ). The dominant isomer among the by-products is 1,1'-oxydi-2-propanol:
The dipropylene glycol isomer mixture is one of the chemicals that are manufactured in large quantities (" High Production Volume Chemical ", HPVC) and for which the Organization for Economic Cooperation and Development (OECD) collects data on possible hazards (" Screening Information Dataset ") , SIDS).
use
Dipropylene glycol as a mixture of isomers is used as a solvent for odor-sensitive applications such as flavors and cosmetics. It is also used as a solvent and humectant for a variety of cosmetic applications. 2,2'-Oxydi-1-propanol is mainly used as a raw material for various chemical compounds such as polyester and urethanes. It is a solvent for cellulose acetate , nitrate and pesticides.
Web links
- Dipropylene Glycol Regular Grade (Dow)
- Justification for Oxidipropanol (Dipropylene Glycol) in TRGS 900 (PDF; 23 kB)
Individual evidence
- ↑ a b c d e f g h Entry for CAS no. 108-61-2 in the GESTIS substance database of the IFA , accessed on April 11, 2010(JavaScript required) .
- ↑ a b c d e f g h Entry for CAS no. 110-98-5 in the GESTIS substance database of the IFA , accessed on July 28, 2012(JavaScript required) .
- ↑ a b c OECD : Screening Information Dataset (SIDS) Initial Assessment Report (SIAR) for propanol, oxybis- , accessed on October 3, 2014.
- ↑ Dipropylene Glycol LO +. Dow Chemical Company , accessed July 11, 2017 .
- ↑ James F. Carley: Whittington's Dictionary of Plastics, Third Edition. CRC Press, 1993, ISBN 978-1-56676-090-4 , p. 138 ( limited preview in Google book search).