Hexanitrostilbene

  • HNS
  • 1,2-bis ( 2,4,6- trinitrophenyl ) ethylene
  • 2,2 ', 4,4 ', 6,6 '- Hexanitrophenylethylen

Fixed

318 ° C ( decomposition)

Template: Infobox chemical / molecular formula search available

Hexanitrostilbene (HNS ) is a heat-resistant explosive which is used especially during blasting in very hot oil reservoirs. HNS is less explosive as RDX (RDX ), but has a higher melting point of about 320 ° C.

Production and representation

The synthesis of HNS by reacting Trinitrobenzylchlorid with alcoholic KOH was first described by Shipp.

Properties

  • Light yellow orthorhombic crystals
  • Sparingly soluble in acetone, methyl ethyl ketone, 100% acetic acid, dimethyl formamide (DMF)
  • Moderately soluble in dimethyl sulfoxide ( DMSO)
  • Can be recrystallized from HNO3, acetone, dimethylformamide and nitrobenzene.
  • HNS is in a wide temperature range stable ( from -200 ° C to 250 ° C) and is therefore also as an explosive in aerospace applications such as Separating screws, etc. are used.

Explosion characteristics

The connection is considered as an explosive. Important explosion indicators are:

  • Explosion heat 4056 kJ · kg -1
  • Normal gas volume: 893 l · kg -1
  • Specific energy: 975 kJ · kg -1
  • Lead block expansion cm3/10 301 g
  • Impact sensitivity to 5 N · m
  • Friction sensitivity from 235 N pin load

Use

In the military technology distinguishes between HNS -I, HNS -II, HNS HNS -IV and -V. These terms characterize the composition and particle properties of HNS. While with HNS I is described with the contaminated Hexanitrobibenzyl HNS referred HNS II recrystallized HNS having at least 98.50 % by weight purity. HNS -IV indicates a material which is obtained by re-precipitation of HNS II, and has a BET surface of 5-25 m2 / g. HNS V finally HNS -IV, which was washed with DMSO, and is free of traces of DMF. HNS is mainly used in amplifiers overloads for explosives and in so-called Explosive -Foil Initiator ( EFI) detonators.

A level of 1% HNS in molten TNT prevents the formation of cracks during solidification. Because of its low kritischern diameter of 0.4 mm HNS can be used in so-called metal- coated cutting cords. HNS is used together with Hexanitroazobenzol CAS-No. [ 19159-68-3 ] used in weak, shelf-stable up to 170 ° C, aluminum - encapsulated detonators.

CAS registry number PubChem Trauzl lead block test BET theory
390573
de