Тринатрийтиофосфат

Description

Trisodium thiophosphate is an inorganic sodium salt of thiophosphoric (thionic) acid, in which one of the oxygen atoms of the phosphate group is replaced by sulfur. Formula H3O3PS.3Na (Na3PO3S), CAS 10101-88-9, EC number 233-261-6. Belongs to the class of alkali metal thiophosphates - sulfur analogues of orthophosphates. English name Trisodium thiophosphate.

Synonyms

• Phosphorothioic acid, sodium salt (1:3)
• Phosphorothioic acid, trisodium salt
• Sodium phosphorothioate (Na3PO3S)
• Trisodium phosphorothioate
• Trisodium monothiophosphate
• Sodium thiophosphate

Basic Attributes

• Molecular weight: 180.01
• Exact mass: 179.90000 (monoisotopic mass 179.89988487)
• EU number: 233-261-6
• UNII: AN1017219I
• PSA Specifications: 101
• XLogP3: 1.15300
• Number of hydrogen bond acceptors: 4
• Number of heavy atoms: 8
• Complexity: 53
• Number of covalently bonded units: 4
• Connection canonized: yes

Physico-chemical characteristics

• Appearance: liquid (technical delivery form, according to the manufacturer)
• Density: 2.149 g/cm3
• Melting point: 56-58 °C
• Hazard label: Xi (irritant)

Scope of application

Its main purpose is as a reagent for separating solid particles in the mining and chemical industry: thiophosphate anion is used as a flotation collector and depressant on the surface of sulfide minerals during ore dressing. The reported production volume is from 1,000,000 to 10,000,000 pounds per year, the leading industry of consumption is mining (except oil and gas) and ancillary activities. The salt is also used as an intermediate product in the preparation of organic esters of thiophosphoric acid, in particular diethyl thiophosphate, which is used in the synthesis of organophosphorus compounds.

Chemical properties and stability

As a thione analogue of phosphate, the substance is capable of hydrolyzing in an acidic environment with the release of hydrogen sulfide, so contact with acids and strong oxidizing agents is unacceptable. The compound is soluble in water, dissociating into sodium ions and the thiophosphate anion PO3S3-, which exhibits more pronounced complexing and reducing properties compared to the usual phosphate ion due to the sulfur atom.

Storage and transportation

Store in a hermetically sealed container, in a dry, cool, ventilated area, away from acids, oxidizing agents and food products. When working with the substance, use gloves and safety glasses, avoid the formation of dust and contact with eyes and skin - the compound is labeled as irritant (Xi). Transportation in standard chemical containers protected from moisture. The conditions for entry into the supplier's nomenclature grid are related to diethyl thiophosphate, an ester derivative obtained on the basis of the thiophosphate group.

Difference from classic phosphate

Compared to trisodium phosphate (Na3PO4), in which all oxygen atoms are bound to phosphorus, the replacement of one oxygen atom with sulfur in thiophosphate shifts the electron density of the P=S bond, reducing the polarity of the anion and increasing its ability to complex with soft metal cations, which determines the flotation activity of the substance towards sulfide minerals of copper, zinc and lead.