Cradle to Gate
Identity ID
23ec4d29-be3d-487a-a4a1-72c8c5fe4309
Materials
Associated ID
af52589e-3765-44d0-bbcf-3ad8c75634ad
Included activities starts
Included activities ends
Description
Phosphorus oxychloride is widely used in fields such as the semiconductor industry and organic synthesis, as a catalyst in the synthesis of pharmaceuticals and dyes, and in the preparation of high-purity phosphoric acid. Phosphorus oxychloride is modelled as a pure substance; when modelling this substance, the user is required to add a solvent of their choice in the model. The dataset includes the main raw and auxiliary materials, energy, wastes and atmospheric emissions of the production process, while infrastructure such as the manufacture of production equipment and plant construction is not included within the dataset boundary; the data inventory is formed by merging data from multiple sources; the production activities of this product include liquid-oxygen gasification, oxidation, oxygen absorption, condensation, tail-gas absorption and other process steps.
Activity Description
The production activities of this product include liquid oxygen vaporization, oxidation, oxygen absorption, condensation, exhaust gas absorption and other processes.
Process Description
The chemical formula of phosphorus oxychloride is POCl3, CAS No. 10025-87-3. It is a colorless to light yellow liquid at room temperature, with a pungent odor and strong volatility. It is easily soluble in organic solvents such as benzene and carbon disulfide, and will quickly hydrolyze into phosphoric acid and hydrogen chloride when exposed to water. The reaction is violent and exothermic, and may be accompanied by smoke. It is more corrosive than phosphorus trichloride and can cause deep burns when in contact with the skin. Inhalation of vapor can seriously irritate the respiratory tract and lungs, and is a toxic chemical. Storage must be in corrosion-resistant sealed containers, placed in a dry and ventilated place, and contact with water and alkali substances is strictly prohibited. Industrially, it is mostly used in the semiconductor industry (preparation of photoresist, dopants), organic synthesis (production of phosphate plasticizers, flame retardants), and can also be used as a catalyst for medicine and dye synthesis, and can also be used to prepare high-purity phosphoric acid.
Time period
2020
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The phosphorus trichloride oxidation method is the mainstream technology for producing phosphorus oxychloride, which is obtained through the oxidation reaction of phosphorus trichloride with oxygen/chlorine. The process is integrated with the production capacity of phosphorus trichloride and accounts for over 95% of the domestic phosphorus oxychloride market. This data set represents the mainstream technology: a specified amount of phosphorus trichloride is injected into both the oxidation kettle and the oxygen absorption kettle, while excess liquid oxygen is vaporized and fed into the oxidation kettle to react with phosphorus trichloride. The unreacted oxygen is then introduced into the oxygen absorption kettle, and the tail gas is discharged into the tail gas absorption system for treatment. The materials in the oxygen absorption kettle (mainly phosphorus trichloride and phosphorus oxychloride) are periodically transferred to the oxidation kettle for reuse. In the absorption system, the tail gas is absorbed to produce hydrochloric acid and phosphorous acid, and the remaining tail gas is further absorbed by alkali liquor before being periodically discharged to the wastewater treatment station. The main chemical reaction involved is: 2PCl₃ + O₂ → 2POCl₃.