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Film pre-forming two flowing type nozzle, stillpot with the nozzle and technique for producing ultra-fine dust utilizing the stillpot

A technology of ultra-fine particles and pre-film formation, which is applied in the field of precipitation kettles, can solve problems such as rubber seal ring damage, seal ring deformation, and polluted products, and achieve the increase of flow cross-sectional area, decrease of flow resistance, and small flow cross-sectional area Effect

Inactive Publication Date: 2005-11-02
贺文智 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For such devices, since the supercritical CO 2 It has a strong swelling property for rubber, and the supercritical CO permeated inside the rubber ring after each operation 2 Due to decompression and expansion, the sealing ring is seriously deformed or even broken; in addition, the corrosion and dissolution of rubber by some organic solvents will also cause damage to the rubber sealing ring and contaminate the product
Therefore, during the operation process, new rubber rings need to be replaced frequently, which greatly increases the operating cost and brings inconvenience to the operation

Method used

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  • Film pre-forming two flowing type nozzle, stillpot with the nozzle and technique for producing ultra-fine dust utilizing the stillpot
  • Film pre-forming two flowing type nozzle, stillpot with the nozzle and technique for producing ultra-fine dust utilizing the stillpot
  • Film pre-forming two flowing type nozzle, stillpot with the nozzle and technique for producing ultra-fine dust utilizing the stillpot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: as figure 2 ,image 3, Figure 4 As shown, the pre-filming two-flow nozzle 14 includes a housing 1, a pre-filming device 2 in the housing 1, a flow channel 3 in the pre-filming device 2 and a ring between the housing 1 and the pre-filming device 2 The gap flow channel 4, the solution inlet pipe 5 communicates with the annular gap flow channel 4 through the shell 1, a spiral flow guide groove 11 is arranged in the annular gap flow channel 4, a spiral flow guide rod 6 is arranged in the flow channel 3, and the spiral flow guide rod 6 is arranged in the flow channel 3. The wall surface of the guide groove 11 and the spiral guide rod 6 is evenly grooved 9, and the inclination angle of the spiral groove 9—the angle between the spiral groove 9 and the axial direction is 15°-75°. The purpose is to guide the solution in the annulus channel 4 to rotate; by replacing the spiral guide groove 11, the inclination angle of the spiral guide groove can be changed within ...

Embodiment 2

[0040] Embodiment 2: as Figure 7 , Figure 8 As shown, the sedimentation tank with supercritical fluid forced dispersion solution to prepare the nozzle of ultrafine particles includes a cylinder 12, a cylinder cover 13 at the upper end of the cylinder 12, a nozzle 14 on the cylinder cover 13, and connects the cylinder 12 and the clamp 15 of the cylinder cover 13, the seal 16 between the cylinder body 12 and the inside of the cylinder cover 13, and the filter 17 at the bottom of the cylinder body 12, the nozzle 14 is the nozzle as described in embodiment 1, and the seal 16 It is a C-shaped annular metal seal 18. The precipitation kettle is the place where the SF antisolvent contacts with the solution, mass transfers, and precipitates solute particles. Its operating pressure is high and the sealing requirements are strict. The clamp is used to connect the C-shaped ring metal seal 18 with a self-tightening sealing structure, which solves the problem of replacing the rubber sea...

Embodiment 3

[0045] The process of producing ultrafine particles by using supercritical fluid to forcibly disperse solution to prepare ultrafine particles using nozzles, firstly CO from steel cylinders 2 After being pressurized and preheated by the compressor and heat exchanger, it flows through the flow channel 3 of the nozzle 14 installed on the top of the precipitation tank, and is sprayed into the precipitation tank from the capillary inner tube flow channel 7 connected with it; by heating, Control the temperature of the precipitation kettle above the critical temperature; when the precipitation kettle reaches the critical temperature above 30°C and the pressure above 7.1MPa, under the action of the high-pressure pump, the solution containing the solute passes through the annular gap flow channel 4 of the nozzle 14 and the spiral in it. The diversion tank 11 is spread into a rotating liquid film, and is sprayed into the precipitation tank with a certain cone angle α; at the same time, t...

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Abstract

The present invention discloses one kind of pre-filming flow nozzle, stillpot with the nozzle and the production process of superfine particle in the stillpot with the nozzle. The nozzle includes casing, pre-filming unit, flow channel, ring gap flow channel, etc. and has the structure with greatly lowered flow resistance on solution and less jamming caused by the solute particle. The stillpot has simple structure, convenient operation, light labor strength and excellent sealing effect owing to the C-shaped metal sealing part with upper and lower sealing planes in linear contact state. By means of the supercritical fluid forced dispersing solution process in the stillpot with the nozzle, superfine solute particle may be prepared.

Description

Technical field: [0001] The invention relates to a nozzle and a precipitation kettle with the nozzle, in particular to a pre-filming two-stream nozzle for preparing superfine particles from a supercritical fluid forced dispersion solution and a precipitation kettle with the nozzle, and the use of the nozzle Nozzles and settling tanks are used to produce ultra-fine particles. Background technique: [0002] Ultrafine particles, especially nanoparticles, have been widely used in materials, chemical industry, light industry, metallurgy, electronics and other fields, and have become a hot research field in today's high-tech. Supercritical Fluid Precipitation (Supercritical Fluid Precipitation referred to as SFP) technology has become an attractive new method for the preparation of ultrafine particles due to the advantages of small size, narrow particle size distribution, and easy control of product shape, particle size and particle size distribution. At the same time, because SF...

Claims

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Application Information

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IPC IPC(8): B01D9/04
Inventor 贺文智索全伶洪海龙阿山
Owner 贺文智
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