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Method for producing superphosphoric acid through concentrating thin-phosphoric acid by using phosphorus combustion heat

A technology of dilute phosphoric acid and phosphorus combustion, applied in chemical instruments and methods, peroxides/peroxyhydrates/peroxyacids/superoxides/ozone oxides, sustainable manufacturing/processing, etc., can solve the problem of product SPA flow Poor performance, large heat consumption, high impurity content

Inactive Publication Date: 2017-10-03
YUNNAN PHOSPHATE CHEM GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SPA production method ① is mainly used to produce high-purity SPA or PPA used in industrial or food additive phosphoric acid. It has the advantages of easy operation, but also has the disadvantage of large cooling load; due to cost constraints, SPA production method ② is only suitable for small batches, Small-scale production; SPA production method ③ mainly uses wet-process phosphoric acid as raw material, which has the advantage of easy access to raw materials, and is used to produce SPA for fertilizers, but there is 2 O needs to consume a lot of heat energy, and due to the high impurity content in the wet-process phosphoric acid, the inside of the concentration device is easy to scale, and the product SPA has the disadvantages of poor fluidity at room temperature

Method used

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  • Method for producing superphosphoric acid through concentrating thin-phosphoric acid by using phosphorus combustion heat
  • Method for producing superphosphoric acid through concentrating thin-phosphoric acid by using phosphorus combustion heat
  • Method for producing superphosphoric acid through concentrating thin-phosphoric acid by using phosphorus combustion heat

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Embodiment 1

[0053] This embodiment provides a method for producing superphosphoric acid by concentrating dilute phosphoric acid with phosphorus combustion heat, and the process flow is as follows figure 1 shown, including the following steps:

[0054] (1) With phosphorus furnace (tail) gas (ω(P 4 ) 0.436%, T=65 ℃, ω (CO) 89%) as phosphorus source, under aerobic condition, carry out full combustion in the hot blast furnace A1, obtain the high-temperature gas containing phosphorus pentoxide (ω (P 2 o 5 )0.125%, T=1365°C);

[0055] (2) Pass the high-temperature gas described in step (1) into the absorption tower B1, and utilize the circulating phosphoric acid from the circulating acid tank F1 to absorb the high-temperature gas in the P 2 o 5 At the same time, high-temperature gas is also used to evaporate the moisture in the circulating phosphoric acid to obtain the product concentrated phosphoric acid (ω(P 2 o 5 )61.5%) and medium-temperature gas (T=135°C); the product concentrated ph...

Embodiment 2

[0058] This embodiment provides a method for producing superphosphoric acid by concentrating dilute phosphoric acid with phosphorus combustion heat, and the process flow is as follows figure 2 shown, including the following steps:

[0059] (1) The yellow phosphorus (ω(P) in the yellow phosphorus storage tank A2 4 )99.8%), introduce phosphorus combustion tower C2 through phosphorus supply equipment B2, carry out full combustion under aerobic conditions, obtain the high-temperature gas (ω(P 2 o 5 )25.36%, T=250°C);

[0060] (2) the high-temperature gas described in step (1) is passed into the absorption tower D2, and the phosphorus pentoxide in the high-temperature gas is absorbed by the absorption cycle phosphoric acid from the absorption cycle acid tank H2 to obtain the first concentrated phosphoric acid (ω(P 2 o 5 )69.6%, T=192°C) and medium temperature gas (T=258°C);

[0061] (3) the medium-temperature gas obtained by step (2) is passed into evaporation tower E2, and t...

Embodiment 3

[0065] This embodiment provides a method for producing superphosphoric acid by concentrating dilute phosphoric acid with phosphorus combustion heat, and the process flow is as follows image 3 shown, including the following steps:

[0066] (1) The yellow phosphorus (ω(P) in the yellow phosphorus storage tank A3 4 )99.8%), introduce horizontal phosphorus combustion furnace C3 through phosphorus supply equipment B3, fully burn under aerobic conditions, obtain high-temperature gas containing phosphorus pentoxide (ω(P 2 o 5 )26.31%, T=760°C);

[0067] (2) The high-temperature gas described in step (1) is passed into the absorption tower D3, while the phosphorus pentoxide in the high-temperature gas is absorbed by the circulating phosphoric acid from the absorption cycle acid tank H3, the high-temperature gas is also used to evaporate the circulating phosphoric acid Medium H 2 O, get concentrated phosphoric acid (ω(P 2 o 5 )69.4%, T=138°C, which is superphosphoric acid) and l...

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Abstract

The invention relates to a method for producing superphosphoric acid through concentrating thin-phosphoric acid by using phosphorus combustion heat. When the method is applied to the production of superphosphoric acid, combustion heat generated from phosphorus combustion and hydration heat resulting from a hydration reaction of a phosphorus combustion product, i.e., phosphorus pentoxide are used for jointly evaporating solvent water in the thin-phosphoric acid; the thin-phosphoric acid is also used for absorbing the phosphorus combustion product, i.e., phosphorus pentoxide so as to increase solute; P4 is a heat supply substance for providing heat and is also a raw material for preparing the superphosphoric acid, thus, in the method disclosed by the invention, P2O5 generated from combustion of the P4 serves as solute, combustion heat of the P4 and hydration heat of the P2O5 are used for evaporating the solvent H2O in the phosphoric acid, the effect of increasing omega (P2O5) in the phosphoric acid in two ways through increasing the P2O5 solute and evaporating the solvent H2O is achieved, and high-concentration phosphoric acid is finally obtained; and thus, during the preparation of the superphosphoric acid, the method disclosed by the invention achieves the efficient utilization of the combustion heat of the P4 and the hydration heat of the P2O5 and has a remarkable energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of phosphoric acid production, and in particular relates to a method for concentrating dilute phosphoric acid with phosphorus combustion heat to produce concentrated phosphoric acid or superphosphoric acid. Background technique [0002] Usually by phosphoric acid (chemical expression H 3 PO 4 ) or phosphorus pentoxide in phosphoric acid solution (chemical expression P 2 o 5 ) mass concentration is ω(P 2 o 5 ) to define different types of phosphoric acid, the specific concepts are as follows: ω(P 2 o 5 )<53% is dilute phosphoric acid (Thin-phosphoric acid abbreviated as TPA), ω(P 2 o 5 )≥53% are collectively referred to as concentrated phosphoric acid (Phosphoric acid simply spelled PA), ω(P 2 o 5 )≥68% is called superphosphoric acid (Superphosphoric acid SPA), ω(P 2 o 5 )≥76.1% is called polyphosphoric acid (Polyphosphoric acid PPA), ω(P 2 o 5 )≥83.4% is called Ultraphosphoric acid (UPA); di...

Claims

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Application Information

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IPC IPC(8): C01B15/16
CPCC01B15/16Y02P20/10
Inventor 马仲明
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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