A kind of preparation device and preparation method of spherical solid phosphoric acid

A technology of solid phosphoric acid and granular solids, which is applied in the direction of phosphoric acid, condensed phosphoric acid, phosphorus oxyacids, etc., and can solve the problems of adhering liquid and poor granularity of solid phosphoric acid particles

Active Publication Date: 2021-05-04
LESHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of poor granularity of solid phosphoric acid particles and liquid attached to the surface of solid phosphoric acid in the production of solid phosphoric acid in the prior art, the present invention provides a preparation device and method for spherical solid phosphoric acid, the purpose of which is to prepare powdered phosphoric acid Solid phosphoric acid product in the form of pellets with good granularity. At the same time, the surface of the prepared solid phosphoric acid product is no longer attached to the surface of liquid phosphoric acid, which is convenient for transportation and use.

Method used

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  • A kind of preparation device and preparation method of spherical solid phosphoric acid
  • A kind of preparation device and preparation method of spherical solid phosphoric acid
  • A kind of preparation device and preparation method of spherical solid phosphoric acid

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preparation example Construction

[0037] The present invention provides a preparation device for spherical solid phosphoric acid, comprising a cooling and solidification tower 4, the bottom of the cooling and solidification tower 4 is provided with a discharge port, and the discharge port is connected with a solid-liquid separation device 6 through a conveying pipeline, as In a preferred manner, the solid-liquid separation device 6 includes a filter centrifuge and a drying device connected in sequence, and the drying device is preferably a purging device or a vacuuming device. The bottom of the cooling and solidification tower 4 is provided with the first cooling medium inlet, and the top in the cooling and solidification tower 4 is provided with the first cooling medium outlet and the drip tray 3, and the height position of the drip tray 3 is located at the first Above the height of the cooling medium outlet.

[0038] In order to realize the functions of controlling the temperature of liquid phosphoric acid a...

Embodiment 1

[0049] Mass fraction is that the phosphoric acid liquid of 91.5wt% is adjusted to 29 ℃ through the phosphoric acid temperature regulating heat exchanger 1 and then sent into the crystal slurry tank 2, and in the crystal slurry tank 2, add phosphoric acid liquid quality 10wt% phosphoric acid hemihydrate crystal (small particle solid Phosphoric acid), stirred at 1000rpm in the magma tank for 20 minutes to obtain phosphoric acid magma. Phosphoric acid crystal slurry forms crystal slurry droplets with a diameter of about 5 mm through the drip tray 3 and drops them into petroleum ether with a boiling range of 60-90° C. as a cooling medium in the cooling solidification tower. Petroleum ether as a cooling medium overflows from the upper part of the cooling and solidification tower 4 and flows into the heat exchanger 7 to be cooled to -20°C, pressurized by the pump 6, and sent from the lower part to the 5m-high tower at a superficial liquid velocity of 0.15m / s. Cooling solidification ...

Embodiment 2

[0051] Mass fraction is that the phosphoric acid liquid of 100wt% is adjusted to 42 ℃ through phosphoric acid thermoregulating heat exchanger 1 and then sent into the crystal slurry tank 2, in the crystal slurry tank 2, add phosphoric acid liquid quality 0.1wt% anhydrous phosphoric acid crystals (i.e. small particles Solid phosphoric acid), stirred at 2000rpm in the magma tank for 10 minutes to obtain phosphoric acid magma. Phosphoric acid magma forms magma liquid droplets with a diameter of about 2mm through the drip tray 3 and drops into the normal hexane as the cooling medium in the cooling and solidification tower. As the cooling medium, n-pentane overflows from the upper part of the cooling and solidification tower 4, is cooled to 35°C in the heat exchanger 7, and then pressurized by the pump 6, and is sent from the lower part to the 5m-high cooling tower at a superficial liquid velocity of 0.3m / s. Solidification tower 4. The descending magma liquid droplets contact with...

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Abstract

The invention belongs to the technical field of chemical industry, and in particular relates to a preparation device and a preparation method of spherical solid phosphoric acid. Aiming at the problems of poor granularity of solid phosphoric acid particles and liquid attached to the surface of solid phosphoric acid in the production of solid phosphoric acid in the prior art, the technical solution of the present invention is: suspending small particles of solid phosphoric acid in liquid phosphoric acid to form a crystal slurry, and using the crystal slurry The small particle solid phosphoric acid in the medium is used as the crystal seed, and the inert liquid without water is used as the cooling medium. The crystal slurry is dispersed into droplets by using the drip tray and dropped into the inert liquid in the cooling and solidification tower. During the process of sinking, it is cooled by the inert liquid and condensed into a solid. The solid is taken out from the bottom of the cooling and solidification tower, separated from the solid and liquid, and the volatile cooling medium on the surface of the solid is removed to obtain spherical solid phosphoric acid.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation device and a preparation method of spherical solid phosphoric acid. Background technique [0002] Phosphoric acid is divided into fertilizer grade, industrial grade, food grade and electronic grade. Industrial grade phosphoric acid is widely used in the production of various phosphate and organophosphorus chemical products. Industrial-grade phosphoric acid (GB / T 2091-2003 industrial phosphoric acid) is usually supplied in two forms with a mass concentration of 75% and 85%. Due to the characteristics of liquid phosphoric acid, it needs to be transported and stored in plastic barrels, which is very inconvenient and increases the cost of phosphoric acid. However, phosphoric acid solutions can solidify at low temperatures: higher concentrations of phosphoric acid can also crystallize at room temperature to form hemihydrate phosphoric acid solids ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/24C01B25/18
CPCC01B25/18C01B25/24
Inventor 夏烈文杨春丽
Owner LESHAN NORMAL UNIV
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