More thoughts on this while I'm at it. Four peroxides to one sulfide, take 15% sulfide solution and 30% peroxide solution, conveniently 9 molar peroxide and 2.2 molar sulfide, 4:1 with equal volumes. Add the sulfide solution TO the peroxide in the idea that
sulfur is less likely to precipitate if surrounded by excess oxidizer. There is lots of energy in the oxidation of sulfide to sulfate and peroxide's loss of the oxygen atom going to water: about 870kJ/mole sulfur and about 400kJ per four moles peroxide. Adding
0.5 L of each solution together makes one liter of one molar in sulfide/sulfate and 1270kJ of excess heat. Unfortunately water going from 0 degC to 100 degC takes up only 420kJ. 1.5 kg of crushed ice with the peroxide solution can take 504kJ melting, and the
water at zero C can take another 630kJ to 100 deg C; we're covered.
One more thing: there may be some neutral ammonia in the ammonium sulfide solution (NH4+ NH3 HS-) which could react with the peroxide, forming a series of nitrogen oxides: H3NO, H2N(OH)O (can form nitrous oxide), HNO2 (forms NO and NO2) and at last, HNO3. Possibly
this is minor, but noticed by bubbling and trace of brown gas.
Add sulfide solution slowly, with stirring to peroxide with crushed ice, in a hood; should work. Small amounts fairly dilute from what I propose, no brainer. Enjoy!
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of JOHN L STRAUGHN <0000120dde6ec15c-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Sent: Saturday, August 1, 2020 5:20 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] neutralizing ammonium sulfide
I'd try this: small scale, look for sulfur precipitation (may clear with further addition of peroxide), nitrogen gas bubbling and further NOx generation (red-brown fumes, ie. in a hood) possible. Get a recipie that works and share it in glory!
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of 00000eca7dd1d088-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU <00000eca7dd1d088-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Sent: Friday, July 31, 2020 12:06 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] neutralizing ammonium sulfide
You might look into adding hydrogen peroxide, perborate or some persulfate derivative.
Dan
-----Original Message-----
From: Nickie Norton <nnorton**At_Symbol_Here**SHEPCHEM.COM>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Fri, Jul 31, 2020 10:35 am
Subject: [DCHAS-L] neutralizing ammonium sulfide
Hi All,
We are using ammonium sulfide in excess in a reaction in water. What is the proper way to dispose of the aqueous ammonium sulfide? We are concerned that if we add bleach we will make chloramine. Does anyone have a
way to convert the ammonium sulfide to ammonium sulfate?
Thank you,
Nickie Norton
Research Chemist
The Shepherd Chemical Company
4900 Beech Street
Norwood, OH 45212
513-842-9332
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