Synthetic introduction of phosphoric acid three octyl ester

　　As a flame retardant, plasticizer and extractant, phosphoric acid three octyl ester is widely used in the production of chemical enterprises. Its most important use is the production of hydrogen peroxide. As the solvent of anthraquinone, octyl phosphate three has high solubility of hydrogen peroxide, high partition coefficient of hydrogen peroxide in water and solvent, high boiling point and high ignition point.

　　Here is a brief introduction to octyl phosphate three:

Physicochemical properties of octyl phosphate three

Three octyl phosphate is a colourless viscous liquid and transparent, mainly used for flame retardant, plasticizer, solvent, solvent hydrogen anthraquinone production, three phosphoric acid octyl melting point -70 C, relative density (water =1) is 0.92, the saturated vapor pressure of 0.28KPa, three octyl phosphate does not dissolve in water. Soluble in alcohol, benzene etc..

Three. Combustion explosion risk of octyl phosphate two

Three - phosphate at 370 degrees or more combustible, recommended C fire rating, three - phosphate flash point of 215.5 DEG C, combustion temperature is 370 DEG C, combustion (decomposition) will produce carbon monoxide, carbon dioxide, phosphorus, and prohibit such strong oxidant, acid and alkali properties such as mixing, mixing and storage of goods, three octyl phosphate fire should use foam, carbon dioxide, dry sand, fire. If the steam in the enclosed area can explode in case of fire, use fog water to cool off the exposed containers.

Three 、 toxicity and emergency treatment of phosphoric acid three octyl ester

Phosphate three octyl ester mainly through inhalation, ingestion, absorption by the skin into the human body, belong to the micro poison, no irritation to the skin and eyes. LD50:3700mg/kg (rat mouth); >12800mg/kg (mouse mouth); 20000mg/kg (rabbit skin);

If skin is exposed to phosphoric acid, three octyl ester, remove contaminated clothing immediately and rinse with flowing water. Pay attention to keep warm and keep quiet. Inhalation, ingestion, or skin contact can cause sluggish reactions. Ensure that medical personnel understand the individual protection knowledge related to the substance and pay attention to self-protection;

If eye contact reaches three octyl phosphate, immediately open the upper and lower eyelids and rinse with flowing water for 15 minutes;

If inhaled three phosphate ester, immediately from the scene to the air fresh, and immediately seek medical treatment, if the patient stops breathing, should immediately give artificial respiration, if breathing difficulties, oxygen;

If eating three octyl phosphate, should drink plenty of warm water and vomiting immediately after medical treatment.

Four, phosphoric acid, three octyl ester, protective measures

1, phosphoric acid three octyl should be closed operation, pay attention to environmental ventilation;

2, in the air phosphoric acid three octyl ester concentration is higher, should wear the gas mask;

3. Higher than any detectable concentration: a self-contained positive pressure respirator, an air supply type positive pressure respirator, and an auxiliary self-contained positive pressure respirator;

4, in case of dangerous escape: should be equipped with an organic vapor filter cartridge of air purification overall hood (gas mask), self portable breathing apparatus;

5, workshop work must wear overalls, if necessary wear protective gloves;

6, smoking is not allowed on the job site. After work, bath and change clothes. Keep good hygienic habits;

Five 、 packaging, storage and disposal of octyl phosphate three

1, three octyl phosphate should be stored in a cool, ventilated storage room, away from fire and heat, keep the container sealed, should be stored separately with oxidizing agents, acids, alkalis, when moving to light light unloading, prevent damage to packaging and containers;

2 and three in case of leakage of phosphate ester, should immediately cut off the fire, emergency personnel wearing gas masks, wearing protective clothing for firefighters, plugging in to ensure the safety, absorption with dry sand or similar material, then collect to open fire, such as a large number of leaks, the dike shelter, then collect, transfer, or harmless treatment of waste recycling;

Synthesis of six, phosphoric acid three octyl ester

Three - phosphate can usually be H3PO4, POCl3, P2O5 and 2- ethylhexanol (i.e. octanol) produced POCl3 reaction, and the reaction of octanol phosphoric acid three - (TOP), because of the economic cost accounting and should be used for industrial production. The synthesis methods of three phosphoric acid octyl ester (TOP) are mainly sodium alcohol and pressure reduction;

Is alcohol sodium hydroxide reaction of alcohol and alkali metal alcoholates, alkali metal generated, then with three phosphorus oxychloride (POCl3) three (TOP) response to octyl phosphate;

The reduction method is under the decompression condition, the alcohol and three phosphorus oxychloride (POCl3) direct reaction, the decompression, the excretion produces HC1, obtains phosphoric acid three octyl ester (TOP);

Upstream raw material: 2- ethyl alcohol (ISO octanol), three oxychloride phosphorus;

Downstream products: hydrogen peroxide.