Preparation method of monopotassium phosphate granules for flame retardance

A technology of potassium dihydrogen phosphate and granules, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc. It can solve the problem that evaporation crystallization does not meet the requirements of environmental protection, and the neutralization method cannot meet the requirements of flame retardant product quality, etc. problems, to achieve the effect of suppressing side reactions and the generation of impurities, ensuring particle size and fluidity, and maintaining the stability of the reaction system

Active Publication Date: 2019-01-04
WUHAN LIANDE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, it can be seen from the above analysis that the traditional neutralization method cannot meet the quality requirements of flame retardant products; moreover, the evaporation crystallization of a large number of products does not meet the requirements of environmental protection

Method used

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  • Preparation method of monopotassium phosphate granules for flame retardance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] 1) Put 12.2 kg of industrial-grade wet-process phosphoric acid with a mass fraction of 85% in an aeration storage tank with an air inlet pipe installed on the top, and use compressed air to pass through the opening of the bottom pipe to the phosphoric acid in the aeration storage tank. Continue aeration at 110°C for 20 minutes; dissolve potassium hydroxide in deionized water under stirring to make a solution with a mass fraction of 35%, and send it to a raw material storage tank with a spray generating device for atomization.

[0082] 2) Place the pretreated phosphoric acid solution in a cone-shaped enamel reaction kettle with a spray feed pipe and a stirring paddle on the top, heat up to 80°C, and start stirring; preheat the 35% potassium hydroxide solution to 80°C ℃, then spray 16.1kg potassium hydroxide solution evenly into the reactor through the spray feed pipe on the upper part of the reactor through the metering pump, control the reaction contact surface at the lo...

Embodiment 2

[0091] Step (1)-(6) method is the same as embodiment 1;

[0092] Step (7) post-processing:

[0093] Further, add 0.6 kg of 200-mesh silicon dioxide to the prepared potassium dihydrogen phosphate particles, stir evenly in a mixer, and vacuum-dry until the product drying loss ≤ 0.2%, to obtain phosphoric acid containing silicon dioxide anticaking agent Potassium Dihydrogen Granules.

Embodiment 3

[0095] 1) 115 kg of high-purity phosphoric acid (made by phosphorus pentoxide) with a mass fraction of 90% is placed in an aeration storage tank with an air inlet pipe installed on the top, and compressed air is used to pass through the bottom pipeline opening to the aeration storage tank. Phosphoric acid was continuously aerated for 15 minutes at 120°C; the potassium hydroxide solid accounting for 95% of the total molar amount of phosphoric acid was dissolved in deionized water under stirring to form a solution with a mass fraction of 40%, and then sent to a spray generator In the raw material storage tank of the device, ready to use.

[0096] 2) Place the phosphoric acid solution after aeration pretreatment in a conical enamel reaction kettle with a spray feed pipe and a stirring paddle on the top, heat up to 85°C, and start stirring; preheat the above potassium hydroxide solution to 85°C, then spray the preheated potassium hydroxide solution evenly into the reactor through ...

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Abstract

The invention provides a preparation method of monopotassium phosphate granules for flame retardance. The preparation method mainly comprises the following steps: preparing phosphoric acid and a potassium hydroxide solution with moderate concentrations as raw materials, and carrying out purification pretreatment on the phosphoric acid; carrying out first neutralization reaction on an atomized potassium hydroxide solution as a raw material; adding a potassium carbonate solution and residual phosphoric acid for carrying out second neutralization reaction; carrying out decoloration impurity removal treatment on reaction liquid; carrying out resin coating modification treatment on monopotassium phosphate; carrying out spraying granulation to obtain the monopotassium phosphate granules for flame retardance. According to the preparation method provided by the invention, the preparation process is combined with the post treatment step by raw material control, stepped neutralization reaction as well as modification and spray drying treatment, so that a mode of obtaining the monopotassium phosphate by concentrating crystals in the prior art is avoided, and procedures of multi-effect concentrated heating and evaporative crystallization are omitted, so that energy consumption is effectively reduced and no waste solution is discharged.

Description

technical field [0001] The invention relates to a preparation method of potassium dihydrogen phosphate, more particularly to a kind of potassium dihydrogen phosphate granule used as a flame retardant and a preparation method thereof, belonging to the technical field of chemical industry. Background technique [0002] Potassium dihydrogen phosphate is an important inorganic chemical raw material. It is widely used in modern industry and agriculture, medicine, food, etc. It is also gradually used as a flame retardant for materials such as wood, paper, fabrics, and coatings. [0003] The production methods of potassium dihydrogen phosphate in my country mainly include neutralization method, direct method, crystallization method, extraction method, electrolysis method, ion exchange method and double decomposition method. [0004] The current neutralization method uses phosphoric acid and potassium salt or potassium hydroxide as the main raw materials in the industry. Yellow pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C08K9/10C08K3/32
CPCC01B25/301C01B25/303C08K3/32C08K9/10C08K2003/324
Inventor 聂治平葛昌志胡育红
Owner WUHAN LIANDE CHEM CO LTD
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