Potassium ferrocyanide: Difference between revisions
Jump to navigation
Jump to search
JeffEvarts (talk | contribs) |
JeffEvarts (talk | contribs) |
||
| (2 intermediate revisions by the same user not shown) | |||
| Line 19: | Line 19: | ||
This general process is repeated in many texts including Industrial Chemistry<ref>{{Cite pub| title=Industrial Chemistry| year=1878| pages=80| publisher=Longmans, Green & Co| doi=| isbn=| url=https://books.google.com/books?id=GR9DAAAAIAAJ&pg=PA80| courtesy=Google| last1=Paul| first1=B. H., PhD}}</ref> and Manual of Chemical Technology<ref>{{cite pub|last1=Von Wagner|first1=Rudolf|title=Manual of chemical technology|year=1897|publisher=D. Appleton & Co.|location=New York|pages=474-477|url=http://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t3tt4gz1p;view=1up;seq=502|courtesy=Hathi Trust}}</ref> | This general process is repeated in many texts including Industrial Chemistry<ref>{{Cite pub| title=Industrial Chemistry| year=1878| pages=80| publisher=Longmans, Green & Co| doi=| isbn=| url=https://books.google.com/books?id=GR9DAAAAIAAJ&pg=PA80| courtesy=Google| last1=Paul| first1=B. H., PhD}}</ref> and Manual of Chemical Technology<ref>{{cite pub|last1=Von Wagner|first1=Rudolf|title=Manual of chemical technology|year=1897|publisher=D. Appleton & Co.|location=New York|pages=474-477|url=http://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t3tt4gz1p;view=1up;seq=502|courtesy=Hathi Trust}}</ref> | ||
# Melt 100ubm [[potassium carbonate]] in a container devoid of oxygen | # Melt 100ubm [[potassium carbonate]] in a container devoid of oxygen | ||
# Add 75-400ubm of nitrogenous biomass (feathers, horn, skins, leather, dry blood) directly to the melt | # Add 75-400ubm of nitrogenous biomass (feathers, horn, skins, leather, dry [[blood]]) directly to the melt | ||
#: '''N.B.:''' Production of solvated potassium cyanide and potassium sulfate {{#Chem: KCN, K2SO4}} | #: '''N.B.:''' Production of solvated potassium cyanide and potassium sulfate {{#Chem: KCN, K2SO4}} | ||
# Allow to cool | # Allow to cool | ||
| Line 28: | Line 28: | ||
# Add 10 ubm [[iron]] filings to a basic solution | # Add 10 ubm [[iron]] filings to a basic solution | ||
#: {{#Chem: 6 KCN + Fe + 2 H2O { OH- = } K4(Fe(CN)6) + 2 KOH + H2 }} | #: {{#Chem: 6 KCN + Fe + 2 H2O { OH- = } K4(Fe(CN)6) + 2 KOH + H2 }} | ||
====via hydrogen cyanide==== | ====via hydrogen cyanide==== | ||
# Combine [[iron (II) chloride]] and [[calcium hydroxide]] in water | # Combine [[iron (II) chloride]] and [[calcium hydroxide]] in water | ||
# Bubble [[hydrogen cyanide]] through the mixture | # Bubble [[hydrogen cyanide]] through the mixture | ||
| Line 42: | Line 40: | ||
# Evaporate filtrate leaving [[potassium ferrocyanide]] | # Evaporate filtrate leaving [[potassium ferrocyanide]] | ||
==Testing== | |||
==Storage== | |||
==Disposal== | |||
==See Also== | ==See Also== | ||
==References== | ==References== | ||
<references/> | <references/> | ||
Latest revision as of 05:20, 14 December 2019
| Chemical formula | K4(Fe(CN)6) |
|---|---|
| OTP appearance | yellow crystals |
| Molar Mass(g/mol) | 368 |
| Density(g/cc) | 1.85 |
| Melting Point(°C) | decomp |
| Solubility in water(g/L) | 289 |
| Solubility in ethanol(g/L) | insoluble |
| NFPA 704 |  0
1
0
|
Uses
Other
- Precursor to Prussian blue on WHO LEM
- Production is a relatively safe sink for cyanides
Natural occurrence
- does not occur in nature
Hazards
- "nontoxic"
- Do not heat or acidify, these actions may produce free cyanides.
Production
Synthesis
via nitrogenous biomass
This general process is repeated in many texts including Industrial Chemistry[1] and Manual of Chemical Technology[2]
- Melt 100ubm potassium carbonate in a container devoid of oxygen
- Add 75-400ubm of nitrogenous biomass (feathers, horn, skins, leather, dry blood) directly to the melt
- N.B.: Production of solvated potassium cyanide and potassium sulfate KCN,K2SO4
- Allow to cool
- Mix with water
- Filter
- Recycle residue (or dispose of carefully, it may be toxic)
- Retain filtrate (it contains potassium cyanide, which is very poisonous/toxic)
- Add 10 ubm iron filings to a basic solution
- 6 KCN + Fe + 2 H2O{OH-K4(Fe(CN)6) + 2 KOH + H2}→
- 6 KCN + Fe + 2 H2O
via hydrogen cyanide
- Combine iron (II) chloride and calcium hydroxide in water
- Bubble hydrogen cyanide through the mixture
- 2 FeCl2(OH)2(H2O)2 + 4 Ca(OH)2 + 12 HCN → 2 Ca2[Fe(CN)6] + 14 H2O + 4 HCl + O2
- Combine with 2 molar equivalents of potassium chloride, precipitating the calcium/sodium salt
- Ca2[Fe(CN)6] + 2 KCl → CaK2[Fe(CN)6(s)] + CaCl2
- Combine with potassium carbonate
- CaK2[Fe(CN)6](aq) + K2CO3(aq) → K4[Fe(CN)6](aq) + CaCO3(s)
- Filter
- Discard residue (calcium carbonate)
- Evaporate filtrate leaving potassium ferrocyanide
Testing
Storage
Disposal
See Also
References
- ↑ Paul, B. H., PhD (1878) "Industrial Chemistry"; pp80.
Longmans, Green & Co
link courtesy Google. - ↑ Von Wagner, Rudolf (1897) "Manual of chemical technology"; pp474-477.
D. Appleton & Co.
link courtesy Hathi Trust.