Rotating liquid film reactor and application thereon in terms of preparation of layered double hydroxides

A liquid film reactor and layered composite technology, which is applied in the direction of oxide/hydroxide preparation, etc., can solve the influence of synthetic hydrotalcite particle size and uniform dispersion performance, concentration gradient, slow reaction speed and diffusion speed, and limited layer In order to achieve the effect of increasing the efficiency of collision reaction, narrow grain size distribution and fine grain

Active Publication Date: 2013-12-25
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The co-precipitation method is the most commonly used method for preparing layered composite metal hydroxides. The equipment used is generally a conventional tank reactor. Due to the mixing of the salt solution and the alkali solution in the reactor, the stirring method is realized. Mixing Very insufficient, the reaction interface is small, there is a concentration gradient, the reaction speed and the diffusion speed are slow, so new precipitated particles are formed on the first precipitated particles, and the new and old particles exist at the same time, resulting in uneven particle size distribution
The particle size and uniform dispersion performance of synthetic hydrotalcite are greatly affected, and its crystal size is difficult to reach the nanometer level, which greatly limits the application of layered composite metal hydroxides

Method used

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  • Rotating liquid film reactor and application thereon in terms of preparation of layered double hydroxides
  • Rotating liquid film reactor and application thereon in terms of preparation of layered double hydroxides
  • Rotating liquid film reactor and application thereon in terms of preparation of layered double hydroxides

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Effect test

Embodiment 1

[0030] Such as figure 1 The rotating liquid film reactor shown has a closed casing as the stator, and the upper end of the stator is closed; there is a rotatable conical rotor inside the stator, and the motor is connected to the bottom of the rotor; the rotor consists of an upper cone, a middle cone and a bottom cylinder. Composed of three parts, these three parts are composed of three separate parts; the cone angle of the upper cone is 45 degrees, the height is 6cm, the distance between the top surface and the upper casing of the stator is 1.5cm, and the bottom surface is connected with the middle cone ; The cone angle of the middle cone is 65 degrees, the height is 9cm, its top surface is connected with the upper cone, and the cross-sectional area of ​​the joint is the same, and its bottom surface is connected with the bottom cylinder; the bottom cylinder section is connected with the middle cone The size of the bottom surface is the same, the diameter is 10cm, and the heigh...

Embodiment 2

[0037] Such as figure 1 The rotating liquid film reactor shown has a closed casing as the stator, and the upper end of the stator is closed; there is a rotatable conical rotor inside the stator, and the motor is connected to the bottom of the rotor; the rotor consists of an upper cone, a middle cone and a bottom cylinder. Composed of three parts, these three parts are combined by three separate parts or processed as a whole; the cone angle of the upper vertebral body is 55 degrees, the height is 8cm, the distance between the top surface and the upper shell of the stator is 2cm, and the bottom surface and the middle part The cones are connected; the cone angle of the middle cone is 75 degrees, and the height is 10cm. The same size as the bottom surface of the middle cone, with a diameter of 50cm and a height of 5cm; two feed ports are symmetrically arranged between the upper cone of the rotor and the stator, and the feed ports are lower than the upper edge of the upper cone of ...

Embodiment 3

[0043] Adopt the rotating liquid film reactor of embodiment 1 to prepare layered composite metal hydroxide, its specific steps are:

[0044] Mg(NO 3 ) 2 , Zn(NO 3 ) 2 and Al(NO 3 ) 3 by Mg 2+ / Zn 2+ / Al 3+ =3:1:2 molar ratio is made into mixed salt solution, wherein [Mg 2+ +Zn 2+ ]=1.4mol / L; NaOH and Na 2 CO 3 Dissolve in deionized water to form a mixed alkali solution of the same volume, where n(NaOH) / [n(Mg 2+ )+n(Al 3+ )]=2.4, n(Na 2 CO 3 ) / n(Mg 2+)=1.6; The two solutions are added to the reactor through two feeding ports of the rotary liquid film reactor respectively at a flow rate of 8kg / min, the slit of the reactor is 30 μm, and the rotor speed is 3000rpm, and the slurry obtained by the reaction is crystallized Crystallize in a kettle at 150°C for 3 hours, filter, wash and dry to obtain a layered composite metal hydroxide, whose chemical formula is Mg 3 ZnAl 2 (OH) 12 (CO 3 )·4H 2 O. The average particle size of the product is 100nm, and the particle...

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Abstract

The invention belongs to a rotating liquid film reactor in the technical field of preparation of inorganic functional materials and application of the rotating liquid film reactor in terms of preparation of layered double hydroxides. On the basis of the basic technology for preparing the layered double hydroxides by a coprecipitation method, a crystal chemistry principle is adopted, fluid mechanics is calculated and analyzed, so that the rotating liquid film reactor is designed, two types of fluid flows in a limited space in a turbulence manner, uniformity of supersaturation degree is guaranteed, nucleation rate of a system is improved, crystal growth speed is reduced, layered double hydroxides products with small sizes and narrow size distribution are obtained, the sizes of the products can be controlled within a range from 10nm to 150nm, and a size distribution range of the products can be reduced to a range from 20nm to 50nm.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic functional materials, in particular to a rotating liquid film reactor and its use in the preparation of layered composite metal hydroxides. Background technique [0002] Layered composite metal hydroxides (Layered Double Hydroxides, referred to as LDHs), also known as hydrotalcite, is a typical anionic layered material, and its chemical composition formula is [M 2+ 1-x m 3+ x (OH) 2 ]A n- x / n mH 2 O, where M 2+ , M 3+ represent divalent and trivalent metal cations, respectively, A n- is an interlayer anion, x is M 3+ The mole fraction of ions, m is the number of crystal water. The element types and composition ratios of the main laminates of LDHs, and the types and quantities of interlayer objects can be adjusted in a wide range according to needs, so as to obtain a series of materials with special structures and properties. [0003] The co-precipitation method is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14
Inventor 林彦军李殿卿李峰段雪
Owner BEIJING UNIV OF CHEM TECH
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