Process and device for selectively producing phosphorus pentoxide

Abstract

The invention discloses a process for selectively producing phosphorus pentoxide. By using yellow phosphorus as a basic material and sulfuric acid as a drying agent, the phosphorus pentoxide is prepared by combustion in a phosphorus combusting furnace, phosphorus pentoxide smoke prepared by combustion of the yellow phosphorus is introduced into a multistage sedimentation system after being cooled through a cooling system, and sent to a material collecting bin after being further cooled by the multistage sedimentation system to prepare phosphorus pentoxide powder, and a tail gas is exhausted after being purified; or the phosphorus pentoxide smoke prepared by combustion of the yellow phosphorus combustion is sequentially introduced into a polyphosphoric acid absorbing tower and a phosphoric acid absorbing tower for being absorbed after being cooled by the cooling system so that polyphosphoric acid and phosphoric acid are respectively obtained, and the tail gas is exhausted after being absorbed through a foam absorbing tower, an ammonia absorbing tower and a fiber demister. According to the process, equipment is capable of reasonably optimizing a structure of production equipment; the purity of the produced phosphorus pentoxide reaches above 99.5 percent, and the phosphorus pentoxide can be largely produced.

Description

technical field [0001] The invention relates to an independent production system of phosphorus pentoxide, specifically a selective phosphorus pentoxide production process and production equipment, belonging to the field of chemical production. Background technique [0002] Burning 1kg of phosphorus can release 2.55*104KJ of energy. The traditional process of domestic phosphorus pentoxide production is to use carbon steel as the material and build multiple huge cooling towers. After heating the solid yellow phosphorus with steam, it will slowly flow into the tower and The dry air blown by the blower reacts and burns to produce phosphorus pentoxide flue gas, and then relies on a huge cooling tower to cool down to produce phosphorus pentoxide products. This process is simple, the investment is small, but the production capacity is low, and the daily output does not exceed three tons, figure 1 It is the original technological process of phosphorus pentoxide. The labor intensit...

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Problems solved by technology

The labor intensity of the workers is high. The traditional device not only fails to effectively use this part of energy, but also fails to recover the heat generated in the production process. Instead, it needs to be equipped with huge natural cooling equipment to cool high-temperature equipment, resulting in huge energy waste. and heat pollution to the environment, which not only wastes energy but also pollutes the environment, and at the same time the production efficiency is low

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