Phosphorus trichloride refining equipment and technology

Abstract

The invention discloses refining equipment of phosphorus trichloride, which comprises a thin film evaporator, a distillation tower, a first-stage condensing device, a second-stage condensing device and a high boiling point receiving tank. The thin film evaporator, the distillation tower, the first-stage condensing device, the second-stage condensing device and the high boiling point receiving tankare connected sequentially with pipes. A receiving line is arranged at the bottom of the first- stage condensing device and the second-stage condensing device to directly connect with the high boiling point receiving tower, and a branch of the receiving line is connected with the thin film evaporator. An air outlet is arranged on the second-stage condensing device to connect with an exhaust gas buffer tank. A reflux port is arranged at the bottom of the rectifying tower to connect with a reflux inlet of the thin film evaporator. A discharge port is arranged at the bottom of the thin film evaporator to connect with a tower discharge tank. Brine at -10 oC is used as a condensate in the secondary condensing device. According to the phosphorus trichloride refining equipment and technology, the content of yellow phosphorus purchased from abroad is higher than 99.9% after special refining treatment and the content of the special key ions arsenic is reduced to 4ppm, thus the quality of phosphorus trichloride produced is very high.

Description

technical field [0001] The invention relates to a refining technology of chemical raw materials. Background technique [0002] Usually, refined fractionation of chemical raw materials requires the use of rectification towers, and chemical equipment such as membrane filters is required for filtration and purification. [0003] Phosphorus trichloride is an important chemical intermediate, widely used in organophosphorus pesticides, medicine, electronics, and dye industries, and is a rare catalyst and phosphorus solvent. [0004] In production, it is difficult to prepare refined phosphorus trichloride with a content ≥99.9%, and at the same time ensure that the impurity ions iron, arsenic, lead, and sulfur are less than 1ppm, and the energy consumption is low. Contents of the invention [0005] Purpose of the invention: [0006] Provide a kind of refining equipment and production process of phosphorus trichloride with low energy consumption per ton, impurity ions lower than ...

AI Technical Summary

Problems solved by technology

[0004] In production, it is necessary to prepare refined phosphorus trichloride with a content ≥99.9%, and at the same time ensure that the impurity ions iron, arsenic, lead, and sulfur are less than 1ppm, and the energy consumption is low, which is difficult to achieve

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