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Method for producing perphosphoric acid by virtue of wet-process phosphoric acid purification

A wet-process phosphoric acid and superphosphoric acid technology, applied in chemical instruments and methods, inorganic chemistry, peroxides/peroxyhydrates/peroxyacids/superoxides/ozone oxides, etc. Efficient purification of wet-process phosphoric acid and other problems to achieve the effects of reduced production time, long time consumption and improved chromaticity

Active Publication Date: 2014-10-22
SHENZHEN BATIAN ECOTYPIC ENG
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Problems solved by technology

[0004] Therefore, the existing superphosphoric acid production scheme lacks low-cost, high-efficiency purification of wet-process phosphoric acid to produce superphosphoric acid technology

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  • Method for producing perphosphoric acid by virtue of wet-process phosphoric acid purification

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specific Embodiment 1

[0019] 0.14g of oxidant ammonium persulfate was reacted with 200g of wet-process phosphoric acid (phosphorus pentoxide content: 35%) for 20 minutes at a temperature of 60°C, and then centrifuged for sedimentation, and the obtained filtrate was directly heated and evaporated to a concentration of 68% phosphorus pentoxide. % (150°C), cooled to 100°C, added 3.5g of precipitant diatomaceous earth, reacted for 60 minutes, cooled to 40°C, added 140g of ethanol for precipitation, and then added 0.14g of polyacrylamide containing polyacrylamide after precipitation solution. After stirring for 30 minutes, the purified phosphoric acid obtained at this time was colorless and transparent. This purified phosphoric acid is heated, evaporated and concentrated (with an additional rectification device to collect ethanol) to obtain a colorless and transparent superphosphoric acid with good fluidity. The polymerization rate was found to be 62% by chromatography.

[0020] By atomic absorption s...

specific Embodiment 2

[0021] 0.9g of oxidant potassium permanganate was reacted with 200g of wet-process phosphoric acid (content of phosphorus pentoxide: 45%) for 100 minutes at a temperature of 100°C, and then centrifuged for sedimentation, and the obtained filtrate was directly heated and evaporated to the concentration of phosphorus pentoxide: 55% (135°C), cooled to 100°C, added 0.9g precipitant diatomaceous earth, reacted for 30 minutes, cooled to 40°C, added 45g methanol to precipitate, added 1.8g activated carbon after precipitation, stirred for 60 minutes and filtered , the purified phosphoric acid obtained at this time is colorless and transparent. The purified phosphoric acid was heated, evaporated and concentrated (methanol was collected by an additional rectification device) to obtain a colorless and transparent superphosphoric acid with good fluidity. The polymerization rate was found to be 67% by chromatography.

[0022] By atomic absorption spectrophotometry, Fe% was 0.0846, Mg% was...

specific Embodiment 3

[0023] Under 85 ℃ of temperature conditions, 0.4g oxidant hydrogen peroxide, reacted with 200g wet process phosphoric acid (phosphorus pentoxide content: 40%) for 50 minutes, centrifugal sedimentation, the obtained filtrate is directly heated and evaporated to the concentration of phosphorus pentoxide to be 65% ( 150°C), cooled to 100°C and added 2.4g of precipitant diatomaceous earth, reacted for 30 minutes, cooled to 55°C, added 80g of n-propanol for precipitation, and then added 0.04g of adsorbent polyacrylamide and 0.4g of activated carbon after precipitation . After stirring for 10 minutes, the purified phosphoric acid obtained at this time was colorless and transparent. This purified phosphoric acid is heated, evaporated and concentrated (n-propanol is collected by an additional rectification device) to obtain a colorless and transparent superphosphoric acid with good fluidity. The polymerization rate was found to be 65% by chromatography.

[0024] By atomic absorption...

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Abstract

The invention discloses a method for producing perphosphoric acid by virtue of wet-process phosphoric acid purification. The method is characterized by comprising the following steps: centrifuging after an oxidant and wet-process phosphoric acid react to obtain a liquid supernatant; heating to 100-300 DEG C, cooling, adding a precipitator, adding an adsorbent in a precipitated mixture, and evaporating a filtered filtrate to obtain perphosphoric acid. According to the method disclosed by the invention, application of the oxidant, the precipitator and the adsorbent to production of perphosphoric acid is firstly disclosed, wherein the oxidant is one of potassium permanganate, ammonium persulfate or hydrogen peroxide; the precipitator is diatomite and alcohol; the adsorbent is more than one of manganese dioxide, polyacrylamide or active carbon. The perphosphoric acid produced by the method disclosed by the invention is excellent in purity, chromaticity and viscosity in comparison with those of the perphosphoric acid produced by the conventional process; moreover, the purification production cost of the perphosphoric acid is greatly lowered, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of superphosphoric acid production, in particular to a method for purifying superphosphoric acid by wet process phosphoric acid. Background technique [0002] At present, there are three kinds of raw material schemes for the production of superphosphoric acid: 1. Using thermal phosphoric acid as raw material, and directly concentrating to produce superphosphoric acid; 2. Using thermal phosphoric acid to absorb phosphorus pentoxide, a high-heat product of burning yellow phosphorus, to obtain superphosphoric acid; 3. Superphosphoric acid is produced from purified wet-process phosphoric acid. Both methods 1 and 2 use yellow phosphorus as a raw material, and the raw material cost of yellow phosphorus is high, which is not conducive to industrial production and processing. The third method is to use wet-process phosphoric acid as the raw material. The current general method is to remove impurities such as Mg, Al...

Claims

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Application Information

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IPC IPC(8): C01B15/16
Inventor 刘腾江寿良褚红艳
Owner SHENZHEN BATIAN ECOTYPIC ENG
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