| Name | Dimethyl heptyl methylphosphonate |
| alias | Di(1-methylheptyl) methyl phosphonate; P350 extractant |
| CAS No. | 76341-63-4 |
| chemical formula | C₁₇H₃₇O₃P |
| molecular weight | 320.25 g/mol |
| density | approximately 0.92-0.96g/cm³(20°C, estimated) |
| boiling Point | > 300°C (high boiling oily liquid at atmospheric pressure) |
| flash Point | > 150°C (closed cup, high flash point non-flammable) |
| water-soluble | insoluble in water, soluble in kerosene, dodecane and other organic solvents |
| vapor pressure | extremely low (<0.01 mmHg,25°C) |
| refractive index | about 1.440-450(20°C, estimated value) |
| storage conditions | store in a cool and dry place, sealed and protected from light, away from oxidizing agents |
| sensitivity | sensitive to moisture, long-term exposure to air may slow hydrolysis |
| appearance | light yellow to amber transparent oily liquid |
| specific Gravity | approx. 0.93-0.97(20/4°C) |
| color | pale yellow |
| dangerous Goods Signs | Xi (Irritant) |
| risk Terms | R36/37/38 (Irritating to eyes, respiratory system and skin) |
| safety terminology | S26 (flush with plenty of water immediately after eye contact);S36/37/39 (wear appropriate protective equipment) |
| customs Number | 2931.90 (organophosphorus compounds, subject to local customs classification) |
1.nature of
Dimethylheptyl methylphosphonate (P350) is a neutral phosphorus-oxygen-type extractant with two 1-methylheptyl groups (C≡Hun72) and one methylphosphonic acid group in its molecular structure. Its core features include:
strong extraction ability: for uranium (U), thorium (Th), neptunium (Np), plutonium (Pu) and other actinides have excellent extraction distribution ratio, especially in nitric acid medium.
High selectivity: Compared with the traditional TBP (tributyl phosphate),P350 has a higher separation factor for rare earth elements and actinides, which can effectively realize the separation of lanthanides and actinides.
High load capacity: unit volume extractant can carry a higher concentration of metal ions, reducing the number of extraction stages and equipment investment.
Good chemical stability: in strong acid (such as nitric acid, hydrochloric acid) and irradiation environment, the structure is stable, not easy to degrade.
Good irradiation performance: suitable for nuclear fuel reprocessing and other strong irradiation scenarios, less radiolysis products, can be recycled.
Low water solubility: very low solubility in the aqueous phase, reducing the loss of extractant and secondary pollution.
Good compatibility with diluent: it can be miscible with kerosene, dodecane and other commonly used diluents in any proportion, which is convenient for the preparation of extraction system.
2. uses
dimethylheptyl methylphosphonate (P350) is mainly used in the following fields:
1.
Nuclear fuel cycle and reprocessing
for the extraction and separation of actinides (U, Pu, Np) in the PUREX process of nuclear fuel reprocessing.
Recovery of uranium and plutonium from nuclear waste to achieve a closed cycle of nuclear fuel.
It is used for the separation and recovery of minor actinides (Am, Cm) in high-level waste liquid.
2.
separation and purification of rare earth
used for the extraction and separation of rare earth elements (such as lanthanum La, cerium Ce, praseodymium Pr, neodymium Nd, etc.).
Enrichment and purification of single rare earth oxides from rare earth ores such as phosphocerite.
The P350-kerosene system was used to separate lanthanum from other rare earth elements efficiently by multistage extraction.
3.
Precious metal extraction
used for extraction and recovery of precious metals such as gold (Au) and platinum group metals.
As a highly efficient extractant in electronic waste and catalyst recovery processes.
4.
hydrometallurgy
for non-ferrous metals (such as cobalt, nickel, copper) hydrometallurgical extraction purification.
Selective extraction of target metal ions in acidic leachate.
3. safety information
dimethylheptyl methylphosphonate (P350) belongs to the GHS classification of skin corrosion/irritation (category 2) and severe eye damage/eye irritation (category 2A), the risk pictogram is GHS07 (exclamation point), and the signal word is “warning”. Hazard claims include: H315 (causes skin irritation), H319 (causes severe eye irritation), and H335 (may cause respiratory irritation). Precautions include: P261 (avoid inhaling dust/fumes/gases/fumes/vapors/spray), P280 (wear protective gloves/protective clothing/goggles/face shield), P305 + P351 + P338 (flush with water for several minutes if entering eyes).
First aid measures: wash with soap and plenty of water immediately when in contact with skin; rinse with flowing water for at least 15 minutes when in contact with eyes and seek medical treatment in time; transfer to fresh air after inhalation, and perform artificial respiration if necessary; do not induce vomiting after ingestion, and seek medical treatment immediately.
Fire protection measures: This product is a flammable liquid, flammable in case of open flame and high heat. When extinguishing fire, dry powder, carbon dioxide, sand or anti-soluble foam can be used to avoid direct impact with water.
Leakage emergency: use sand or other inert materials to absorb the leakage and collect it in a closed container to avoid entering the sewer and water source.
Operation precautions: Operate in a well-ventilated place, wear appropriate protective equipment, and avoid contact with oxidants and strong alkalis.
Storage conditions: Store in a cool, dry, well-ventilated warehouse, keep the container sealed, and store separately from oxidants and edible chemicals.
4. our production advantages and capacity
production advantages
independent research and development process
P350 synthesis process with independent intellectual property rights, the use of advanced esterification reaction route, high product purity, low impurity content.
Independent production of key intermediates, from the source to control the quality of raw materials, to ensure batch-to-batch stability.
High purity products
product purity ≥ 99%, acid value, moisture, color and other key indicators are better than industry standards.
Strictly control the content of monoester, triester and other by-products to ensure stable and reliable extraction performance.
Customized Services
can provide different purity levels (industrial grade, analytical grade, nuclear grade) products according to customer needs.
Support special packaging specifications (such as stainless steel barrels, fluorine plastic bottles, etc.) to meet the special requirements of the nuclear industry and hydrometallurgy.
Technical Support
with a professional application R & D team, we can provide customers with a full range of technical support such as extraction process optimization, diluent selection, and extraction equipment selection.
Capacity
our company has an annual production capacity of 500 tons of dimethylheptyl methylphosphonate (P350), which can be expanded to 1000 tons/year according to market demand. Regular inventory is maintained at around 50 tons, ensuring rapid response to customer order requirements.
Delivery cycle: Regular orders can be delivered within 7-15 days; bulk orders can be negotiated according to the specific quantity to determine the delivery time.
Packing specification: the standard package is 200L steel-plastic composite barrel, and 1000L IBC ton barrel can also be provided. At the same time, it supports the customized packaging scheme according to the special needs of customers.
Mode of transportation: The product is transported by road or rail with dangerous goods transportation qualification to ensure safety and compliance throughout the process.
Post time: Aug-20-2026
