What is polytechnic acid?
Polylactic acid, also known as poly(lactic acid) or polylactide (abbreviation PLA) is a thermoplastic polyester with backbone formula (C. 3H. 4O. 2)
What are Thionic acids?
Medical Definition of thionic acid : any of a series of unstable acids of the general formula H2SnO6 in which the number of atoms of sulfur in the molecule varies from 2 to 6.
What is the formula of polythionic acid?
Polythionic acid is an oxoacid which has a straight chain of sulfur atoms and has the chemical formula Sn(SO3H)2 (n > 2). Trithionic acid (H2S3O6), tetrathionic acid (H2S4O6) are simple examples. They are the conjugate acids of polythionates.
How polythionic acid is formed?
Polythionic acid is formed in the presence of sulfur, moisture and oxygen. Sulfur can come from feed stock, additives or fuels. This failure mechanism is possible from both inside and outside of a tube, depending on the sulfur source.
What is the structure of H2S2O6?
Dithionic acid
| PubChem CID | 26985 |
|---|---|
| Structure | Find Similar Structures |
| Molecular Formula | H2S2O6 or H2O6S2 |
| Synonyms | Dithionic acid 14970-71-9 hypodisulfuric acid H2S2O6 CHEBI:29208 More… |
| Molecular Weight | 162.15 |
What is the molecular formula of Dithionic acid?
H2S2O6
Dithionic acid/Formula
What does Thionic mean?
: relating to or containing sulfur.
What is the structure of h2s2o4?
Dithionous acid
| PubChem CID | 24490 |
|---|---|
| Structure | Find Similar Structures |
| Molecular Formula | H2S2O4 or H2O4S2 |
| Synonyms | dithionous acid dithionige Saeure hypodisulfurous acid 15959-26-9 CHEBI:29253 More… |
| Molecular Weight | 130.15 |
How many SS bonds does Polythionic acid have?
The number of S−S bonds in polythionic acid H2SnO6 is n−1.
What is Polythionic stress corrosion cracking?
Polythionic acid stress corrosion cracking (PASCC) is a type of material failure that occurs when sensitized austenitic stainless steel and some nickel alloy steels develop sulfide scale on their surface during an operation that exposes them to air and moisture.
What is Polythionic acid corrosion?
Polythionic Acid Stress Corrosion Cracking (PASCC) is a type of intergranular stress corrosion that affects sensitized stainless steels in refineries processing feedstocks containing sulphur.
What is Wackenroder solution?
Definition of Wackenroder solution : a solution containing colloidal sulfur and polythionic acids obtained by passing hydrogen sulfide into a saturated aqueous solution of sulfur dioxide.
Which is the best definition of polythionic acid?
Definition of polythionic acid. : a thionic acid containing more than two sulfur atoms in the molecule.
What kind of corrosion is polythionic acid cracking?
Polythionic Acid Stress Corrosion Cracking (PASCC) is a type of intergranular stress corrosion that affects sensitized stainless steels in refineries processing feedstocks containing sulphur.
Where is polythionic acid found in stainless steel?
Both austenitic and straight chromium grades of stainless steels can be attacked by polythionic acid. This phenomenon is usually an internal problem, occurring on the process-exposed side of a piping run, vessel shell, exchanger bundle, heater tube, etc.
How are polythionic acids destroyed in aqueous solution?
Polythionic acids are stable only in aqueous solutions, and are rapidly destroyed at higher concentrations with the release of sulfur, sulfur dioxide and – sometimes – sulfuric acid. Acid salts of polythionic acids do not exist.