Method for preparing barium sulfate particles through microchannel method

A microchannel and barium sulfate technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problems of large amount of surfactant, difficult cleaning of EDTA, expensive equipment, etc. , to achieve the effect of preventing excessive local concentration, small residence time, and small pollution

Active Publication Date: 2018-11-23
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
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Problems solved by technology

When the particles are prepared by the precipitation method, the operation is simple and the purity is high, but the agglomeration is serious; when the particles are prepared by the EDTA complex precipitation method, the EDTA adsorbed on the surface of the particles is difficult to clean, and the yield is low; In the case of particles, the amount of surfactant is large, the cost is high and it is easy to cause pollution; when the nanoparticle is prepared by the supergravity method, the equipment is expensive and the cost is high

Method used

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  • Method for preparing barium sulfate particles through microchannel method
  • Method for preparing barium sulfate particles through microchannel method
  • Method for preparing barium sulfate particles through microchannel method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 2.55g of barium acetate and 1.32g of ammonium sulfate in 500mL of distilled water, fully dissolve, and at 25°C, send the reactant solution into the Y-shaped microchannel reactor through the advection pump at a flow rate of 0.6mL / min. The inner diameter of the reactor is 0.2 mm, and the length is 10 cm; after the reaction system is stable, the sample is collected from the outlet of the reactor to obtain the reaction solution; After washing with ethanol several times, the white precipitate was dried in an oven for 12 hours to finally obtain micron-sized, flaky barium sulfate particle powder, and its SEM image is as follows figure 2 shown.

Embodiment 2

[0024] Weigh 5.10g of barium acetate and 4.76g of sodium persulfate in 500mL of distilled water and dissolve them fully. At 35°C, the reactant solution is sent into the Y-shaped microchannel reactor through an advection pump at a flow rate of 1.0mL / min. The inner diameter of the channel reactor is 0.1 mm, and the length is 10 cm; after the reaction system is stable, a sample is taken from the outlet of the reactor to obtain a reaction solution; Wash with water and ethanol for several times, dry the white precipitate in an oven for 12 hours, and finally obtain micron-sized, leaf-shaped barium sulfate particle powder, and its SEM picture is as follows image 3 shown.

Embodiment 3

[0026] Weigh 2.08g of barium chloride and 1.32g of ammonium sulfate in 250mL of distilled water and dissolve them fully. At 45°C, the reactant solution is sent into a T-shaped microchannel reactor at a flow rate of 1.4mL / min through an advection pump. The channel reactor has an inner diameter of 0.1 mm and a length of 10 cm. After the reaction system is stable, take samples from the outlet of the reactor to obtain the reaction solution; centrifuge the obtained reaction solution, wash the obtained white precipitate with ion water and absolute ethanol several times in turn, and put the white precipitate in an oven After drying for 12 hours, irregular cubic barium sulfate particle powder with a particle size of 98-300nm was finally obtained.

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Abstract

The invention belongs to a method for preparing barium sulfate particles through a microchannel method in the technical field of nanomaterial preparation. The method comprises the following steps: introducing a sulfate water solution and a barium salt water solution into a microchannel reactor for reacting and ageing, and centrifuging, washing and drying an obtained reaction solution, thus obtaining the barium sulfate particles, wherein selected sulfate is sodium sulfate, ammonium sulfate or sodium persulfate, and barium salt is barium chloride, barium acetate or barium nitrate. The morphologyand the particle size distribution of the obtained barium sulfate particles are controllable, and industrial application of medical dry films can be met to a larger extent.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing barium sulfate particles by a microchannel method. Background technique [0002] As a chemical inorganic material with excellent properties, nano-barium sulfate has unique chemical and physical properties, so it is widely used in dyes, inks, pharmaceutical synthesis, rubber and other industries. The narrow particle size distribution and good regularity of nano-barium sulfate particles are important indicators for obtaining high performance. Therefore, the preparation of high-quality nano-barium sulfate particles has very important practical significance. [0003] The preparation methods of nano-barium sulfate particles include precipitation method, EDTA complex precipitation method, reverse microemulsion method, microchannel method, high gravity method and so on. When the particles are prepared by the precipitation method, the operation is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F11/462C01P2004/03C01P2004/38C01P2004/62C01P2004/64
Inventor 靳海波叶飞飞杨索和郭晓燕何广湘张荣月
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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