Trimethyl Phosphate (TMP)

Catalog NumberACM512561-3

CAS Number512-56-1

CategoryPhosphate Ester Flame Retardant

Synonyms	Trimethyl Phosphate (TMP)
Molecular Weight	140.07
Molecular Formula	C3H9O4P
Purity	≥99%
Appearance	Colorless transparent liquid
Application	Mainly used as the solvent and extractant of medicine and pesticide
Acid Value	Max 0.2 (mgKOH/g)
Packaging	200KG/galvanized iron drum; or 16tons/container for export.

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Case Study

Enhancing Lithium-Ion Battery Safety and Performance with High-Concentration Trimethyl Phosphate Electrolytes

Wang, Xianming, et al. Journal of The Electrochemical Society 153.1 (2005): A135.

This work reported the development of a high-concentration trimethyl phosphate (TMP)-based nonflammable electrolyte for lithium-ion batteries with graphite anodes. With a TMP content exceeding 70%, this formulation significantly improves battery safety while maintaining electrochemical performance.
Preparation:
TMP solvent was purified using molecular sieve 4A prior to use. Electrolytes were prepared in an Ar-filled glove box using reagent grade LiPF6, LiBETI, and a ternary additive mixture consisting of vinylene carbonate (VC), vinyl ethylene carbonate (VEC), and cyclohexane (CH). An anode-active material (STG) with partially amorphous carbon-coated graphite surface was used to improve reduction stability.
Key Results:
· Suppression of TMP reduction at graphite was achieved by combining three methods: 1) STG graphite with partially amorphous carbon coating increased the interfacial stability. 2) Synergistic effect of the ternary additive (2 mol% VC + 8 mol% VEC + 2 mol% CH) on charge-discharge performance. 3) A high concentration of LiBETI (2 mol dm-3) also suppressed TMP decomposition.
· Stable cycling using a nonflammable electrolyte (>70% TMP) was realized, which is a new advance for graphite-anode Li-ion batteries with high-TMP electrolytes.

Evaluating Trimethyl Phosphate as a Combustion Inhibitor in Turbulent Methane/Air Flames

Wang, Lei, et al. Fuel 294 (2021): 120324.

The effectiveness of trimethyl phosphate (TMP) as a combustion inhibitor in turbulent premixed methane/air flames was investigated in this work.
Methods: An experimental approach was employed using OH Planar Laser-Induced Fluorescence (OH-PLIF) to visualize instantaneous flame structures and analyze flame characteristics. Important statistical parameters such as the global consumption speed, mean fuel consumption rate and mean heat release rate were determined to quantify the inhibition effect by TMP in turbulent flows. Various TMP loadings were tested across different jet velocities to assess their impact on flame behavior.
Key Results:
· The addition of TMP significantly altered flame dynamics. High TMP concentrations shifted the turbulent combustion regime from Thin Reaction Zones (TRZ) to Distributed Reaction Zones (DRZ). Turbulent consumption speed decreased notably with TMP introduction.
· The relative inhibition efficiency of TMP was lower in turbulent flames compared to laminar configurations. This reduction is attributed to turbulent transport effects, which hinder the interaction between phosphorus-containing species (e.g., PO2, HOPO) and key radicals (H, OH), diminishing radical scavenging capacity.
· The increase of jet velocity decreased the mean fuel consumption rate and the mean heat release rate in an uninhibited flame. In TMP-inhibited flames, the opposite trend is observed, indicating complex turbulence-inhibitor interactions.

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