View source for Hydroxylammonium perchlorate

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| Name = Hydroxylammonium perchlorate
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| IUPACName = Hydroxylammonium perchlorate
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| SystematicName =
| OtherNames = Hydroxylamine perchlorate
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| Section1 = {{Chembox Identifiers
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| Section2 = {{Chembox Properties
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| Appearance = White hygroscopic solid
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| BoilingPt_notes = Decomposes, explodes
| Density = 2.06 g/cm<sup>3</sup><ref>https://www.docdroid.net/vugHRJ9/atlantic-research-corporation-research-on-the-deflagration-of-high-energy-solid-oxidizers.pdf</ref>
| Formula = H<sub>4</sub>NO<sub>5</sub>Cl<br>H<sub>3</sub>NOHClO<sub>4</sub>
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| LogP = -2.289
| MolarMass = 133.49 g/mol
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| MeltingPtC = 85-89
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| MeltingPt_notes = <ref>https://www.docdroid.net/vugHRJ9/atlantic-research-corporation-research-on-the-deflagration-of-high-energy-solid-oxidizers.pdf</ref><ref>Makhonina; Lempert; Nechiporenko; Russian Journal of Inorganic Chemistry; vol. 44; nb. 2; (1999); p. 167 - 170</ref>
| Odor = Odorless
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| Solubility = Soluble
| SolubleOther = Soluble in [[diethyl ether]], [[ethanol]], [[methanol]]
| Solubility1 = 30.4 %w/w<ref>Grigorovich, Z. I.; Lyubimova, G. N.; Razumova, A. P.; Russian Journal of Inorganic Chemistry (Translation of Zhurnal Neorganicheskoi Khimii); vol. 25; (1980); p. 543 - 546; Zhurnal Neorganicheskoi Khimii; vol. 25; (1980); p. 975 - 981</ref>
| Solvent1 = diethyl ether
| Solubility2 = 71.2 % w/w<ref>Grigorovich, Z. I.; Lyubimova, G. N.; Razumova, A. P.; Russian Journal of Inorganic Chemistry (Translation of Zhurnal Neorganicheskoi Khimii); vol. 25; (1980); p. 543 - 546; Zhurnal Neorganicheskoi Khimii; vol. 25; (1980); p. 975 - 981</ref>
| Solvent2 = ethanol
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| DeltaHf = -278.236 kJ/mol
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| MainHazards = Explosive<br>Toxic
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| Section7 = {{Chembox Related
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| OtherCompounds = [[Hydroxylammonium chloride]]<br>[[Hydroxylammonium nitrate]]<br>[[Hydroxylammonium sulfate]]
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'''Hydroxylammonium perchlorate''' ('''H<sub>3</sub>NOHClO<sub>4</sub>''') or '''HAP''' is the [[perchloric acid]] salt of hydroxylamine. It is a powerful explosive and rocket propellant, but its use is limited due to its hygroscopicity and cost.

==Properties==
===Chemical===
Hydroxylammonium perchlorate decomposes when heated above 89 °C, releasing nitrogen, nitrous oxide, oxygen, chlorine, HCl, water vapors. It can even explode if heated too high.

Woelen described the decomposition flame as blue.<ref>https://www.sciencemadness.org/whisper/viewthread.php?tid=13174#pid180372</ref> Also, adding sodium bromate (NaBrO<sub>3</sub>) to a concentrated solution of hydroxylammonium perchlorate will cause an explosion after addition. If potassium bromate is used instead, there is a delay, then the mixture ignites in a very violent reaction. A similar reaction occurs if iodite or chlorite salts are used.<ref>https://www.sciencemadness.org/whisper/viewthread.php?tid=26982#pid305423</ref>

===Physical===
Hydroxylammonium perchlorate is a hygroscopic white solid, very soluble in water. At 18 % relative humidity, crystalline HAP absorbs enough moisture from air to nearly dissolve itself, within 10 minutes.<ref>https://www.docdroid.net/vugHRJ9/atlantic-research-corporation-research-on-the-deflagration-of-high-energy-solid-oxidizers.pdf</ref>

===Explosive===
Hydroxylammonium perchlorate is explosive, though its sensitivity is limited by its hygrocopicity. Addition of bromates, iodates or chlorites will cause ignition or even detonation. When heated above 89 °C, it will begin to decompose violently, and at 150 °C it will explode.<ref>Lidin R.A., Andreeva L.L., Molochko V.A. Inorganic matter constants (Константы неорганических веществ) - M.: Bustard, 2006, pp. 135</ref> Its sensitivity has been described to be similar to that of [[Erythritol tetranitrate|ETN]].<ref>https://www.docdroid.net/vugHRJ9/atlantic-research-corporation-research-on-the-deflagration-of-high-energy-solid-oxidizers.pdf</ref>

==Availability==
Hydroxylammonium perchlorate is not sold due to its hazards and has to be prepared in situ.

==Preparation==
Hydroxylammonium perchlorate can be prepared by reacting [[hydroxylammonium chloride]] with [[barium perchlorate]], in absolute [[ethanol]]:<ref>https://patents.google.com/patent/US2768874</ref>

: Ba(ClO<sub>4</sub>)<sub>2</sub> + H<sub>3</sub>NOHCl → 2 H<sub>3</sub>NOHClO<sub>4</sub> + BaCl<sub>2</sub>

Hydroxylammonium sulfate can also be used, though a different solvent than ethanol may be required.

: Ba(ClO<sub>4</sub>)<sub>2</sub> + (H<sub>3</sub>NOH)<sub>2</sub>SO<sub>4</sub> → 2 H<sub>3</sub>NOHClO<sub>4</sub> + BaSO<sub>4</sub>

==Projects==
*[[Rocket propellant]]

==Handling==
===Safety===
Hydroxylammonium perchlorate is a powerful oxidizer and may even explode if heated at high temperatures.

Hydroxylamine and its compounds are irritant to the respiratory tract, skin, eyes, and other mucous membranes and are considered possible mutagenic. 

===Storage===
Hydroxylammonium perchlorate is very hygroscopic and should only be kept in airtight bottles, and only for short periods of time.

===Disposal===
Hydroxylammonium perchlorate should first be converted to hydroxylammonium chloride or sulfate, which can be done by diluting the compound, then adding a potassium salt (or KOH). The resulting hydroxylamine salt solution is filtered off and neutralized like any other hydroxylamine salt. It can be neutralized by using a ketone and then gently heating the resulting oxime, which reforms the ketone and releases nitrogen gas and water. It can also be neutralized by diluting it with water and carefully adding ferric salts or other compounds known to accelerate its decomposition.

Reduction of hydroxylamine with Zn/HCl yields ammonia. 

==References==
<references/>
===Relevant Sciencemadness threads===
*[http://www.sciencemadness.org/talk/viewthread.php?tid=26572 Short question / quick answer - Thread]
*[https://www.sciencemadness.org/whisper/viewthread.php?tid=26982 Does nitroammonium exist ? or similar cations ?]

[[Category:Chemical compounds]]
[[Category:Inorganic compounds]]
[[Category:Nitrogen compounds]]
[[Category:Hydroxylammonium compounds]]
[[Category:Perchlorates]]
[[Category:Oxidizing agents]]
[[Category:Carcinogenic]]
[[Category:Energetic materials]]
[[Category:Secondary explosives]]