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Method and system for continuously preparing nano barium sulfate

A nano-barium sulfate and preparation system technology, which is applied in a field of continuous preparation of nano-barium sulfate, can solve the problems of difficult industrial production and residence, and achieve the effects of easy scale-up production, short residence time and high solution concentration

Pending Publication Date: 2021-08-06
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are basically still in the laboratory stage, and it is difficult to realize industrial production.

Method used

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  • Method and system for continuously preparing nano barium sulfate
  • Method and system for continuously preparing nano barium sulfate
  • Method and system for continuously preparing nano barium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Industrial grade BaS was selected as the raw material of water-soluble barium compound, and a BaS solution with a concentration of 1 mol / L was prepared in a barium liquid storage tank at 60 °C. Select industrial grade Na 2 SO 4 As a raw material for sulfate, prepare Na at a concentration of 2.0 mol / L in a sulfate storage tank at 40°C 2 SO 4 solution. The inner diameter of the static pipeline mixing reactor is 5mm, and there are 5 SMV type mixing units inside. Two kinds of solutions are input in the pipe mixing reactor through the feed port, and the flow velocity of the BaS solution is controlled by the barium liquid feeding device 3 and the sulfate feeding device 5 to be 0.2m / s, Na 2 SO 4 The flow velocity of the solution is 0.1m / s, at this flow velocity, [Ba 2+ ]:[SO 4 2- ] The molar ratio (molar ratio) of the substances is 1:1.

[0040] The barium sulfate suspension obtained by the reaction is input into the first filter device, the soluble matter in the slur...

Embodiment 2

[0043] Change the specifications of the static pipeline mixer, the inner diameter of the mixer is 15mm, and there are 5 SMV type mixing units and 5 BKM type mixing units arranged alternately inside. Other conditions are with embodiment 1. The barium sulfate content, whiteness, volatile matter content at 105°C, average particle size and dispersibility of the obtained nano-barium sulfate product were measured, and the results are shown in Table 1.

Embodiment 3

[0045] Select industrial grade BaCl 2 As a water-soluble barium compound raw material, prepare BaCl with a concentration of 2.4mol / L in a barium liquid storage tank at 70°C 2 solution (saturation concentration). Select industrial grade Na 2 SO 4 As the sulfate raw material, prepare Na at a concentration of 3.2mol / L in a sulfate storage tank at 60°C 2 SO 4 solution (saturation concentration). The static pipeline mixing reactor is composed of two mixers connected in series. There are 8 SMV mixing units inside the front mixer with an inner diameter of 10mm. There are 10 Kenics pipeline mixer mixing units inside the back end mixer with an inner diameter of 10mm. The two mixers are connected by flanges. Two kinds of solutions are input in the pipeline mixing reactor through feed inlet, utilize barium liquid feeding device 3 and sulfate feeding device 5 to control the flow velocity of two kinds of solutions and be 1.5m / s, under this flow velocity, [Ba 2+ ]:[SO 4 2- ] The s...

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Abstract

The invention discloses a method and system for continuously preparing nano barium sulfate. A water-soluble barium solution and a sulfate solution are input into a static pipeline mixing reactor in proportion, so that the two solutions rapidly flow in the static pipeline mixing reactor and form turbulent flow to be fully mixed, and the two solutions rapidly react to generate nano barium sulfate suspension. The static pipeline mixing reactor is any one or a combination of more of a static porous plate type pipeline mixing reactor, a static special-shaped plate type pipeline mixing reactor and a static spiral plate type pipeline mixing reactor. The barium sulfate suspension is filtered and washed for multiple times, the pH value is adjusted, anddrying and crushing are conducted to prepare the nano barium sulfate powder material. The content of the obtained barium sulfate is higher than 99%, the average particle size can be controlled within 20-100 nm, the particle size distribution is narrow, the whiteness is superior to 98.8%, and the content of volatile matter at 105 DEG C is lower than 0.08%. The method has the advantages of being wide in application range, controllable in barium sulfate particle size, continuous and controllable in production process, easy to industrialize and the like.

Description

technical field [0001] The invention relates to a method and system for continuously preparing nano-barium sulfate, in particular to a process for continuously preparing barium sulfate nano-materials through a pipeline mixing reactor, which belongs to the technical field of nano-materials. Background technique [0002] Barium sulfate is an important chemical material. Barium sulfate is non-toxic, resistant to acid and alkali, stable in chemical properties, high in brightness and good in dispersibility. It has been widely used in rubber, plastic, ink, coating and other fields. Nano-barium sulfate has important physical and chemical properties such as nano-size effect and surface effect. It is an important functional filling material for high-end electronic equipment, organic coatings for plastic molds, and high-end automotive paints. It is used in ceramics, medicine, magnetic materials, optical materials and composite materials. The field has broad application prospects. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00B82Y40/00
CPCC01F11/462B82Y30/00B82Y40/00C01P2004/03C01P2006/80C01P2006/65C01P2004/64
Inventor 韦进全江正根崔贤韦杨春韦郁芬
Owner TSINGHUA UNIV
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