Heat-recoverable efficient phosphorus trichloride production device

Abstract

The invention discloses a heat-recoverable efficient phosphorus trichloride production device, which comprises a reaction kettle, a chlorine buffer tank, a phosphorus washing tower, a heat exchanger, a vapor-liquid separator and a hot water tank, the reaction kettle is of a double-layer hollow structure, and a phosphorus trichloride content detection apparatus is arranged on one side of the reaction kettle, the phosphorus trichloride content detection device comprises a liquid separation tank arranged on one side of the reaction kettle side by side, the bottom end of the liquid separation tank is connected with the bottom end of the reaction kettle through a first communicating pipe, the top end of the liquid separation tank is connected with the top end of the reaction kettle through a second communicating pipe, and control valves are arranged on the first communicating pipe and the second communicating pipe. According to the invention, along with the reaction process of chlorine and yellow phosphorus in the reaction kettle, the concentration of phosphorus trichloride in the reaction is changed and the buoyancy of the floating ball is changed through the change of the content of phosphorus trichloride in the liquid separation tank in the reaction process, so that the real-time detection of the content of phosphorus trichloride in the reaction is realized, and the device has the characteristics of high detection efficiency and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of phosphorus trichloride production, in particular to a high-efficiency phosphorus trichloride production device with recoverable heat. Background technique [0002] Phosphorus chemical industry is a new fine chemical industry that has developed rapidly since the 1970s. Our country started relatively late. Compared with the international level, there is a big gap in product variety and quality. Because phosphorus chemical products have their own unique excellent performance, they have replaced the original non-phosphorus functional chemical products in many fields. Take phosphorus trichloride as an example; Organophosphorus pesticides, new water treatment agents, flame retardants, plasticizers and stabilizers, etc., with the development of the national economy, the demand is increasing day by day, and the plasticizer industry must catch up as soon as possible under the current situation of the rapid develop...

AI Technical Summary

Problems solved by technology

[0004] 1. The gas-liquid separator is operated under a slight negative pressure, and there is a breathing port. The breathing port often emits acidic smoke. The heat exchanger is severely corroded in the environment of alternating cold and hot, dry and wet cycles; When encountering acid mist that often emerges, more serious acid corrosion occurs. Even a 5mm thick heat exchanger has a lifespan of only 2-3 years. Entering, the pipeline is often blocked, producing a large amount of phosphoric acid and hydrochloric acid;

[0005] 2. The production capacity of a single device is low; the reaction of yellow phosphorus and chlorine releases a lot of heat, but it is not recycled

[0006] 3. It is difficult to monitor the content of base phosphorus in the existing preparation process of phosphorus trichloride;

[0007] 4. The existing phosphorus trichloride has a poor cooling effect on the reactor during the production process

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