Bezaleel
Hazard to Others
Posts: 444
Registered: 28-2-2009
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Thermal decomposition of EDTA
I feel sorry to ask this here, but can anybody find me an article or book about the products formed during the thermal decomposition of EDTA and its
disodium salt?
I tried Google but the very best I found was an MSDS found here saying
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Hazardous combustion:
EDTAs are not considered flammable or combustible. Thermal decomposition products may release toxic and/or hazardous fumes and gases including
nitrogen oxides, carbon oxides, metal oxide, and water vapors.
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I tried a search on Reaxys, but it didn't give me much usefull stuff. (It's quite time consuming to go through all results, as the go back of my
browser didn't seem to work.) I only got articles about thermal decomposition of something else in the presence of EDTA.
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violet sin
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Location: Daydreaming of uraninite...
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>One-step pyrolysis route to C/Fe3O4 hybrids from EDTA ferric sodium salt
https://www.google.com/url?sa=t&source=web&rct=j&...
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>Thermal Decompositionof EDTA, NTA, and NitrilotrimethylenephosphonicAcid in Aqueous Solution
https://www.google.com/url?sa=t&source=web&rct=j&...
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>Thermal treatment on tin(II/IV) oxalate, EDTA and sodium inositol-hexaphospate
(Just link to abstract) https://hungary.pure.elsevier.com/en/publications/thermal-tr...
... "The tin EDTA complex first lost its hydrate bound water till 520 K. The followed thermal events related to the pyrolysis of anhydrous salt. The
intense exothermic process that exists in the temperature range of 820-915 K is due to the formation of SnO2."...
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>Thermal decomposition of ethylenediaminetetraacetic acid in the presence of 1,2-phenylenediamine and hydrochloric acid
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S...
"Both EDTA and its disodium salt are stable to heat even at 423 K.19 EDTA begins to decompose at about 463 K and nearly 50% breaks down at 483 K in
the presence of metal ions.12 Stepwise decarboxylations and hydrolysis procedures of the ethylene C-N link of EDTA have been suggested by earlier
researchers.13,14 As shown in Figure 1, the decomposition mode may differ greatly with temperature changes."
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Something to start with hopefully. Searched using "pyrolysis products of EDTA sodium salts" and "pyrolysis products of EDTA sodium salts thermal
decomposition". Easy-peasy.
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Bezaleel
Hazard to Others
Posts: 444
Registered: 28-2-2009
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Mood: transitional
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Thanks! Good to include the term pyrolysis products. I didn't do that. The last link also has the references to what seems basic research on this.
I want to make sure that no extremely toxic products develop (like HCN) when thermolysing bits of EDTA that remained.
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