Chemistry:Adiponitrile

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Adiponitrile
Structural formula of adiponitrile
Ball-and-stick model of the adiponitrile molecule
Names
Preferred IUPAC name
Hexanedinitrile[1]
Other names
  • Adipic acid dinitrile
  • Adipic acid nitrile
  • Adipyldinitrile
  • 1,4-Dicyanobutane
  • Hexanedioic acid dinitrile
  • Nitrile adipico
  • Tetramethylene cyanide
  • Tetramethylene dicyanide
Identifiers
3D model (JSmol)
1740005
ChemSpider
EC Number
  • 203-896-3
MeSH adiponitrile
RTECS number
  • AV2625000
UNII
UN number 2205
Properties
C6H8N2
Molar mass 108.144 g·mol−1
Appearance Colourless liquid
Density 951 mg mL−1
Melting point 1 to 3 °C; 34 to 37 °F; 274 to 276 K
Boiling point 295.1 °C; 563.1 °F; 568.2 K
50 g/L (20 °C)
Vapor pressure 300 mPa (at 20 °C)
1.438
Thermochemistry
84.5–85.3 kJ mol−1
Hazards
GHS pictograms GHS06: Toxic
GHS Signal word DANGER
H301, H315, H319, H330, H335
P260, P284, P301+310, P305+351+338, P310
NFPA 704 (fire diamond)
Flammability code 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 fuelHealth code 4: Very short exposure could cause death or major residual injury. E.g. VX gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
2
4
0
Flash point 93 °C; 199 °F; 366 K (open cup)[2]
550 °C (1,022 °F; 823 K)
Explosive limits 1.7–4.99%
Lethal dose or concentration (LD, LC):
155 mg kg−1 (oral, rat)
NIOSH (US health exposure limits):
PEL (Permissible)
 none[2]
REL (Recommended)
 TWA 4 ppm (18 mg/m3)[2]
IDLH (Immediate danger)
 N.D.[2]
Related compounds
Related alkanenitriles
 Glutaronitrile
Related compounds
 hexanedioic acid
hexanedihydrazide
hexanedioyl dichloride
hexanediamide
1,4-diisocyanobutane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Tracking categories (test):

Adiponitrile is an organic compound with the chemical formula (CH2)4(CN)2. This viscous, colourless dinitrile is an important precursor to the polymer nylon 66. In 2005, about one million tonnes of adiponitrile were produced.[4]

Production

Early methods

Because of the industrial value of adiponitrile, many methods have been developed for its synthesis. Early industrial methods started from furfural and later by the chlorination of butadiene to give 1,4-dichloro-2-butene, which with sodium cyanide, converts to 3-hexenedinitrile, which in turn can be hydrogenated to adiponitrile:[4]

ClCH2CH=CHCH2Cl + 2 NaCN → NCCH2CH=CHCH2CN + 2 NaCl
NCCH2CH=CHCH2CN + H2 → NC(CH2)4CN

Adiponitrile has also been produced from adipic acid, by dehydration of the diamide, but this is rarely employed.

Modern methods

After patent application in 2004, the majority of adiponitrile is prepared by the nickel-catalysed hydrocyanation of butadiene, as discovered at DuPont, pioneered by Drinkard. The net reaction is:

CH2=CHCH=CH2 + 2 HCN → NC(CH2)4CN

ButadieneHydrocyanation.svg

The process involves several stages, the first of which involves monohydrocyanation (the addition of one molecule of HCN), affording isomers of pentenenitriles as well as 2- and 3-methylbutanenitriles. These unsaturated nitriles are subsequently isomerized to the 3-and 4-pentenenitriles. In the final stage, these pentenenitriles are subjected to a second hydrocyanation, in an anti-Markovnikov sense, to produce adiponitrile.[4]

3-pentenenitrile, formed in the first hydrocyanation, can undergo alkene metathesis to give dicyanobutenes, which are readily hydrogenated as described above. A useful byproduct of the production of adiponitrile is 2-methylglutaronitrile.

The other major industrial method involves hydrodimerization, starting from acrylonitrile:[5][6]

2 CH2=CHCN + 2 e− + 2 H+ → NCCH2CH2CH2CH2CN

Adiponitrile Synthesis

The electrolytic coupling of acrylonitrile was discovered at Monsanto Company.

Applications

Almost all adiponitrile is hydrogenated to 1,6-diaminohexane for the production of nylon:[7]

NC(CH2)4CN + 4 H2 → H2N(CH2)6NH2

Like other nitriles, adiponitrile is susceptible to hydrolysis; however the resulting adipic acid is less expensively prepared via other routes.

Production

In 2018 there existed approximately 1.5 million tons of capacity. The main producers of adiponitrile are:[8][9]

  • Ascend: Decatur,AL 400kt, being expanded to 580kt by 2022
  • Invista: Victoria,TX and Orange,TX.
  • Invista and BASFjv 'Butachimie': Chalampé (France). Production to be increased from 100kt in 2020 to 600kt.
  • Asahi Kasei

BASF closed the 128kt ADN plant at Seal Sands in 2009.[10]

In 2015, the Shandong Runxing New Material 100kt plant suffered an explosion and was not reopened.[8] In 2022, Invista plans to open a 300-400kt plant in Shanghai.[11]

Safety

The -1">50 for adiponitrile is 300 mg/kg for oral ingestion by rats.[4]

In 1990, ACGIH adopted a time-weighted average Threshold Limit Value of 2ppm for work-related skin exposure.[12]

The NIOSH recommended skin exposure limit for a work related time weighted average concentration is 4ppm (18 mg/m3).[13]

It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.[14]

References

  1. ↑ "adiponitrile - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification. https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=8128&loc=ec_rcs. 
  2. ↑ 2.0 2.1 2.2 2.3 NIOSH Pocket Guide to Chemical Hazards. "#0015". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0015.html. 
  3. ↑ "Archived copy". http://www.nmsu.edu/safety/programs/chem_safety/NFPA-ratingA-C.htm. 
  4. ↑ 4.0 4.1 4.2 4.3 M. T. Musser, "Adipic Acid" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a01_269
  5. ↑ Cardoso, D. S.; Šljukić, B.; Santos, D. M.; Sequeira, C. A. (2017). "Organic Electrosynthesis: From Laboratorial Practice to Industrial Applications". Organic Process Research & Development 21 (9): 1213–1226. July 17, 2017. doi:10.1021/acs.oprd.7b00004. 
  6. ↑ Baizer, Manuel M. (1964). "Electrolytic Reductive Coupling". Journal of the Electrochemical Society 111 (2): 215. doi:10.1149/1.2426086. 
  7. ↑ Robert A. Smiley "Hexamethylenediamine" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a12_629
  8. ↑ 8.0 8.1 Alexander, Tullo (7 Oct 2018). The chemical industry is bracing for a nylon 6,6 shortage. 96. https://cen.acs.org/materials/polymers/chemical-industry-bracing-nylon-66/96/i40. Retrieved 2 March 2021. 
  9. ↑ "Ascend Finalizes $175 Million ADN Project in Alabama | CHEManager". https://www.chemanager-online.com/en/news-opinions/headlines/ascend-finalizes-175-million-adn-project-alabama. 
  10. ↑ Gale, Lindsay (1 April 2009). "End of the line for Seal Sands" (in en). KHL Group. https://www.khl.com/news/End-of-the-line-for-Seal-Sands/1034117.article. Retrieved 2 March 2021. 
  11. ↑ "INVISTA China ADN project receives final construction permit". https://www.invista.com/News-Articles/INVISTA-China-ADN-project-receives-final-construct. 
  12. ↑ 2009 TLVs and BEIs, American Conference of Governmental Industrial Hygienists, Signature Publications, page 11 of 254.
  13. ↑ NIOSH Pocket Guide NIOSH Publication 2005-149; September 2005
  14. ↑ 40 C.F.R.: Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities (July 1, 2008 ed.). Government Printing Office. http://edocket.access.gpo.gov/cfr_2008/julqtr/pdf/40cfr355AppA.pdf. Retrieved October 29, 2011. 

External links




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