Methyl ethyl ketone peroxide

Methyl ethyl ketone peroxide
Names
Preferred IUPAC name
2,2′-Peroxydi(butane-2-peroxol)
Other names
2-[(2-Hydroperoxybutan-2-yl)peroxy]butane-2-peroxol
2-Hydroperoxy-2-[(2-hydroperoxybutan-2-yl)peroxy]butane
Ketonox
Mepox
Thermacure
Identifiers
CAS Number
  • 1338-23-4 checkY
3D model (JSmol)
  • Interactive image
Beilstein Reference
 1759757
ChemSpider
  • 2905622 checkY
ECHA InfoCard 100.014.238 Edit this at Wikidata
EC Number
  • 215-661-2
MeSH Methyl+ethyl+ketone+peroxide
PubChem CID
  • 3672772
UNII
  • W2545087UL checkY
UN number 3105
CompTox Dashboard (EPA)
  • DTXSID1024671 Edit this at Wikidata
InChI
  • InChI=1S/C8H18O6/c1-5-7(3,11-9)13-14-8(4,6-2)12-10/h9-10H,5-6H2,1-4H3 ☒N
    Key: WFUGQJXVXHBTEM-UHFFFAOYSA-N ☒N
  • CCC(C)(OO)OOC(C)(CC)OO
Properties
Chemical formula
 C8H18O6
Molar mass 210.226 g·mol−1
Appearance Colorless liquid
Density 1.170 g cm−3
Boiling point Decomposition beyond 80 °C (176 °F)[2]
Solubility in water
 Soluble[1]
Explosive data
Shock sensitivity High
Detonation velocity 5200 m/s
RE factor 0.9
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Explosive, Toxic
GHS labelling:
GHS01: Explosive GHS07: Exclamation mark GHS08: Health hazard
Danger
H202, H205, H241, H300, H315, H318, H335
P102, P220, P243, P250, P261, P264, P280, P283, P370+P380, P372, P404
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 4: Readily capable of detonation or explosive decomposition at normal temperatures and pressures. E.g. nitroglycerinSpecial hazards (white): no code
2
2
4
Flash point 75 °C (167 °F; 348 K)[2]
NIOSH (US health exposure limits):
PEL (Permissible)
 none[1]
REL (Recommended)
 C 0.2 ppm (1.5 mg/m3)[1]
IDLH (Immediate danger)
 N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references
Chemical compound

Methyl ethyl ketone peroxide (MEKP) is an organic peroxide with the formula [(CH3)(C2H5)C(O2H)]2O2. MEKP is a colorless oily liquid. It is widely used in vulcanization (crosslinking) of polymers.[3]

It is derived from the reaction of methyl ethyl ketone and hydrogen peroxide under acidic conditions. Several products result from this reaction including a cyclic dimer.[4] The linear dimer, the topic of this article, is the most prevalent.[5] and this is the form that is typically quoted in the commercially available material.[6]

Solutions of 30 to 40% MEKP are used in industry and by hobbyists as catalyst to initiate the crosslinking of unsaturated polyester resins used in fiberglass, and casting. For this application, MEKP often is dissolved in a phlegmatizer such as dimethyl phthalate, cyclohexane peroxide,[clarification needed] or diallyl phthalate [de] to reduce sensitivity to shock. Benzoyl peroxide can be used for the same purpose.[citation needed]

Safety

Whereas acetone peroxide is a white powder at STP, MEKP is slightly less sensitive to shock and temperature, and more stable in storage.

MEKP is a severe skin irritant and can cause progressive corrosive damage or blindness.

The volatile decomposition products of MEKP can contribute to the formation of vapor-phase explosions. Ensuring safe storage is important, and the maximum storage temperature should be limited to below 30 °C.[7]

Notes

  1. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0416". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ a b Record of 2-Butanone peroxide in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 10 March 2013.
  3. ^ Klenk, Herbert; Götz, Peter H.; Siegmeier, Rainer; Mayr, Wilfried (2000). "Peroxy Compounds, Organic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_199. ISBN 978-3527306732.
  4. ^ Pastureau, P. (1907). "Le superoxyde de la méthyléthylcétone". Comptes Rendus. 144 (2): 90–93.
  5. ^ Milas, N. A.; Golubović, A. (1959). "Studies in Organic Peroxides. XXV. Preparation, Separation and Identification of Peroxides Derived from Methyl Ethyl Ketone and Hydrogen Peroxide". Journal of the American Chemical Society. 81 (21): 5824–5826. doi:10.1021/ja01530a068.
  6. ^ "2-Butanone peroxide". Sigma-Aldrich. Retrieved 5 December 2011.
  7. ^ "Methyl Ethyl Ketone Peroxide (MEKP): Production And Uses". 19 May 2023. Retrieved 29 July 2023.

External links

  • Media related to Methyl ethyl ketone peroxide at Wikimedia Commons
  • CDC - NIOSH Pocket Guide to Chemical Hazards
  • The Register: Mass murder in the skies: was the plot feasible?
  • New York Times: Details Emerge in British Terror Case
  • The Free Information Society: HMTD Synthesis Archived 3 March 2016 at the Wayback Machine
  • How MEKP cures Unsaturated Polyester Resin (video animation)