Method for preparing nano calcium carbonate by microreaction

A technology of nano-calcium carbonate and micro-reaction, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of unfavorable continuous production, large equipment investment, complex reactor design, etc., to overcome uneven concentration distribution uniform effect

Inactive Publication Date: 2018-05-15
UNIV OF JINAN
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Problems solved by technology

The mass transfer and reaction of gas-liquid-solid multiphase are carried out in the spiral channel of the reactor rotor, that is, the carbonization reaction. The emulsion after the reaction is discharged from the outlet at the bottom of the rotating bed. After filtration and drying, nano-scale Ultrafine calcium carbonate, but the design of the reactor is complicated, the equipment investment is large, the energy consumption is high, and it is difficult to clean up, which is not conducive to the subsequent continuous production

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  • Method for preparing nano calcium carbonate by microreaction

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0031] A preparation device for preparing nano-calcium carbonate by microreaction, such as figure 1 As shown, it consists of a constant temperature water tank 1, a microreactor 2, a temperature controller 3, an advection pump 4, a mixing tank 5, an agitator 6, a filtrate regenerator 7, a mixed gas flowmeter 8, a nitrogen storage tank 9, and a carbon dioxide flowmeter 10. A temperature sensor 11, a carbon dioxide storage tank 12, a pH value measuring instrument 13, a feeding pump 14, a washing filter 15, a dryer 16 and corresponding connecting pipes.

[0032] A method for preparing nano-calcium carbonate by micro-reaction, using figure 1 The preparation process shown:

[0033] (1) The reaction system is CO with a volume fraction of 30% 2 -N 2 Mixed gas and mass percent concentration of 15% to 35% Ca(OH) 2 The suspension reacts in the microreactor 2;

[...

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Abstract

The invention provides a method for preparing nano calcium carbonate by microreaction. A device for preparing the nano calcium carbonate by the microreaction mainly comprises a thermostatic water bath, a micro reactor, a temperature controller, a constant-flux pump, a mixing tank, a stirrer, a filtrate regenerator, a mixed gas flowmeter, a nitrogen storage tank, a carbon dioxide flowmeter, a carbon dioxide storage tank, a pH value measuring instrument, a material conveying pump, a water washing filter, a dryer and corresponding connecting pipelines. By adopting a calcium carbonate microreaction carbonization process, reaction time can be greatly shortened, the yield of a nano calcium carbonate product is improved, distribution range of particle size is narrow, the quality of a product is stable, industrial production can be realized, as well as a simple process and low energy consumption are realized.

Description

technical field [0001] The invention relates to the technical field of chemical material preparation, in particular to a method for preparing nano-calcium carbonate by micro-reaction. Background technique [0002] Calcium carbonate is widely used in the fields of papermaking, plastics, papermaking, rubber, viscose, paint and ink, etc. It can play the role of incremental filling, reduce processing costs, and can also perform functional modification on filling objects. Nano-calcium carbonate, due to its smaller particle size, higher specific surface area and special surface treatment, has superior properties that cannot be compared with micron-sized ordinary calcium carbonate. [0003] At present, there are mainly two methods for the production of nano-calcium carbonate: double decomposition method and carbonization method. (1) The double decomposition method mainly uses water-soluble calcium salts to react with water-soluble carbonates under appropriate process conditions, a...

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00B01J19/00
CPCC01F11/181B01J19/0093B82Y30/00
Inventor 陈中合王瑞李玉川
Owner UNIV OF JINAN
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