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14481-26-6
futurechem
14481-26-6
Potassium titanium oxalate (PTO, potassium titanyl oxalate) is a white to pale-yellow crystalline complex salt with the formula K₂TiO(C₂O₄)₂·2H₂O — a stable, water-soluble carrier of titanium in an easily handled form. It is best known as the active agent of titanium-based leather tanning, the leading chromium-free alternative to traditional chrome tanning.
PTO-based tanning delivers the properties tanners value: white and light-fast leather, soft and full handle, good elasticity, firm leather body, and excellent resistance to light. The same complex also serves as a textile mordant and whitening agent, a catalyst for aromatic oxidation, and a molecular titanium source for TiO₂ synthesis. One salt, a chromium-free answer to leather and beyond.
A single salt, four core value propositions:
Leather Tanning:
● a chromium-free titanium tanning agent giving white, soft, light-fast leather with high liquor uptake;
Textile Mordanting:
● a mordant and whitening agent for cotton and leather dyeing and printing;
Catalysis & Chemical Synthesis:
● a catalyst for oxidation of aromatic compounds to carboxylic acids and acid anhydrides;
TiO₂ Precursors & Specialty:
● a molecular titanium source for TiO₂ synthesis and an analytical reagent.
Item | Specification |
Chemical Name | Potassium titanium oxalate (Potassium titanyl oxalate) |
Synonyms | PTO; Titanium potassium oxalate; Dipotassium bis(oxalato)oxotitanate; Potassium oxalatotitanate(IV); Potassium oxodioxalatotitanate(IV) |
CAS No. | 14481-26-6 |
EC No. (EINECS) | 238-475-7 |
Molecular Formula | K₂TiO(C₂O₄)₂·2H₂O |
Molecular Weight | 354.13 g/mol |
Appearance | White to pale-yellow crystalline powder |
Solubility | Freely soluble in water; insoluble in alcohols |
PTO is a coordination complex in which a central oxo-titanium(IV) unit is chelated by two oxalate ligands, balanced by two potassium cations: K₂[TiO(C₂O₄)₂]·2H₂O. The oxalate chelation holds titanium in solution across a wide pH range, which is what makes the salt an effective, controllable titanium donor in aqueous processes — tanning liquors, mordant baths and precursor chemistry — without the uncontrolled hydrolysis of simple titanium salts.
In tanning, the titanium complex penetrates the hide and cross-links collagen, stabilizing the leather against heat and decay — the same structural role chrome performs, but without chromium's environmental and health burden. Grade selection follows the market: tanning grade serves leather processing; mordant grade serves textile dyeing; reagent grade serves catalysis and analysis. All grades are white powders, freely soluble in water, with assay (as TiO₂) and impurity data on the COA.
● Chromium-free tanning: replaces chrome tanning with a low-toxicity titanium system, reducing heavy-metal burden in leather and effluent.
● Superior white leather: produces white and light-fast leather with soft, full handle, elasticity and firmness.
● Excellent leather performance: light-fast, wash-resistant and wear-resistant finished leather.
● Stable water-soluble titanium: oxalate chelation controls hydrolysis, giving clean, reproducible aqueous processes.
● Dual textile value: effective mordant and whitening agent for cotton and leather dyeing.
● Catalytic value: oxidation catalyst for aromatic compounds to carboxylic acids and anhydrides.
● Multi-market reach: tanning, textiles, catalysis, TiO₂ synthesis and analysis from one salt.
PTO is the leading chromium-free titanium tanning chemical:
● Titanium tanning: chrome-free tanning of hides and skins with white, light-fast results;
● Wet-white pre-tanning: titanium-based “wet-white” pretanning for light-colored and ecological leathers;
● Retanning: retanning agent improving fullness, softness and grain quality;
● Chrome-free finished leather: automotive, furniture and garment leathers meeting chromium-free requirements;
● Tanning-liquor performance: low effluent load and lighter wastewater color.
● Mordant: fixes dyes on cotton and leather, improving color fastness;
● Whitening agent: brightens dyed and printed textiles;
● Printing and dyeing auxiliary: titanium complex in dye-bath formulations.
● Oxidation catalysis: catalyzes oxidation of aromatic compounds to carboxylic acids and acid anhydrides;
● Fine-chemical synthesis: catalyst and titanium source in organic transformations;
● Green chemistry: reusable, low-toxicity titanium catalyst systems.
● TiO₂ synthesis: precursor for titanium-dioxide powders and films via acidic/H₂O₂ routes;
● Surface treatment: titanium deposition on ceramic, glass and metal surfaces;
● Analytical reagent: titanium standard and complexometric reagent in laboratories;
● Specialty chemicals: titanium source for coatings, catalysts and functional materials.
Packaging (customizable):
● 25 kg multi-wall paper bag with PE liner, 25 kg fiber drum, or 500 kg – 1,000 kg FIBC;
Storage:
● Keep in a cool, dry, well-ventilated area away from direct sunlight and heat;
● Keep containers tightly closed to prevent moisture pick-up and caking;
● Store away from strong oxidizers and incompatible materials;
● Recommended storage temperature 5 °C – 35 °C.
● Factory-direct supply: own production capacity, transparent pricing, no middleman markup;
● Stable quality: strict internal control, every batch tested, COA with every shipment; small trial orders accepted.
● Export experience: familiar with sea/air shipping documentation for chemical commodities, complete paperwork support;
PTO is used mainly as a chromium-free titanium tanning agent in leather production, giving white, soft, light-fast leather with high bath uptake. It is also a textile mordant and whitening agent, a catalyst for oxidation of aromatic compounds, and a molecular titanium source for TiO₂ synthesis and analytical reagents.
Chrome tanning uses chromium(III) salts, which are excellent tanners but raise heavy-metal and effluent concerns. Titanium tanning with PTO is chromium-free and low-toxicity: it yields white, light-fast leather with soft, full handle and good elasticity, absorbs of the tanning liquor, and produces much lighter wastewater. It is the leading choice for chromium-free, ecological leather programs.
Simple titanium salts hydrolyze rapidly in water, precipitating TiO₂. In PTO, two oxalate ligands chelate the titanium center, holding it in solution across a wide pH range. That chelation makes the salt a controllable, reproducible titanium donor for tanning baths, mordant solutions and precursor chemistry.
PTO has low acute toxicity, but the powder can irritate the eyes, skin and respiratory tract, and oxalate salts are toxic if ingested in quantity. Use gloves, goggles and dust protection, avoid ingestion, and wash hands after handling. It is an industrial chemical
