Process and device for selectively producing phosphorus pentoxide

A kind of phosphorus pentoxide, selective technology, applied in the direction of phosphorus oxide, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of wasting energy, environmental thermal pollution, energy utilization, etc., to reduce water consumption and labor intensity , the effect of increasing production

CN103723695AInactive Publication Date: 2014-04-16HUBEI LIUSHUGOU CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-04-16
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment 1

[0028] Put 10 tons (24 hours of phosphorus input) of yellow phosphorus into the phosphorus furnace 1 and burn it to produce phosphorus pentoxide flue gas, use sulfuric acid as a desiccant, open the valve, and send the phosphorus pentoxide flue gas through the flue gas pipeline. into the cooling tower 2, forcedly cooled to below 360°C by the water wall in the cooling tower 2, and the pressure is 1kpa, the cooled phosphorus pentoxide flue gas passes through the buffer tank 3 and then is sent to the 10-stage settling bin 4 to settle, so that the pentoxide The temperature of the phosphorus pentoxide flue gas is reduced to below 360°C, and the pressure is 1kpa. After cooling and sedimentation, the phosphorus pentoxide is sent to the phosphorus pentoxide silo 5 for absorption to produce 23.7 tons of phosphorus pentoxide with a purity higher than 99.5%, and the tail gas After purification, it is discharged through the exhaust gas discharge channel 7-1.

[0029] 10 tons (24 hours of p...

Embodiment 2

[0032] A new type of phosphorus pentoxide production equipment, the phosphorus furnace 1 is connected to the cooling tower 2 through the flue gas pipeline controlled by the valve, the cooling tower 2 is connected to the buffer tank 3, and the multi-stage settlement chamber 4 is set behind the buffer tank 3, and the multi-stage settlement The multi-stage settling bin 4 is connected to the packaging hopper 6 through the collection bin 5; the flue gas pipeline controlled by the valve of the phosphorus furnace 1 is connected to the polyphosphoric acid absorption tower 7 and the phosphoric acid absorption tower 8 in turn, and the phosphoric acid absorption tower 8 is absorbed by ammonia The tower 9 is connected with a fiber demister 10 .

[0033]The length of the flue gas pipeline from the phosphorus burning furnace 1 to the polyphosphoric acid absorption tower 7 is 28-35m. The side wall of the cooling tower 2 is provided with a circulating water channel,

[0034] The multi-level ...