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A kind of method that solvent method prepares calcium bicarbonate powder

A technology of calcium bicarbonate and solvent method, applied in the direction of calcium carbonate/strontium/barium, etc., can solve problems such as difficult synthesis of calcium bicarbonate

Active Publication Date: 2020-05-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The object of the present invention is to provide a method for preparing calcium bicarbonate powder by a solvent method, which can quickly prepare calcium bicarbonate in one step, and solves the problem that it is difficult to synthesize calcium bicarbonate in the solution; and the purity of the prepared calcium bicarbonate is at least 95%. %

Method used

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  • A kind of method that solvent method prepares calcium bicarbonate powder
  • A kind of method that solvent method prepares calcium bicarbonate powder
  • A kind of method that solvent method prepares calcium bicarbonate powder

Examples

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Embodiment 1

[0038] Dissolve calcium chloride in ethanol to a concentration of about 40mmol / L; then add triethylamine to an equal volume of ethanol to a concentration of about 80mmol / L. After mixing evenly, pass in carbon dioxide gas under stirring, filter with a sand core funnel after white turbidity is formed, and wait for the solvent to volatilize at dry room temperature to obtain high-purity calcium bicarbonate powder with a purity of 100%.

[0039] Such as Figure 1-4 As shown, the calcium bicarbonate powder prepared in Example 1 has been respectively characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and X-ray diffraction. from figure 1 It can be seen that the product has characteristic peaks of bicarbonate and O-H-O hydrogen bonds, which are completely different from the spectral peaks of calcium carbonate; from figure 2 As can be seen from the weight loss curve in, the purity of product is 100%; From image 3 It can be seen that the...

Embodiment 2

[0041] Dissolve calcium chloride dihydrate in acetone so that the concentration reaches about 15mmol / L, and then add triethylamine to an equal volume of acetone until the concentration is about 37.5mmol / L. After mixing evenly, pass a sufficient amount of carbon dioxide gas into the solution containing triethylamine. Afterwards, the two solutions were mixed under stirring, centrifuged after white turbidity was formed, and the supernatant was removed. After the solvent is volatilized at room temperature, high-purity calcium bicarbonate powder can be obtained.

[0042] The calcium bicarbonate powder prepared in this embodiment has also been characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and X-ray diffraction, which proves that the product is calcium bicarbonate nanopowder with a purity of 96%. The yield was 100% by gravimetric analysis.

Embodiment 3

[0044] Dissolve calcium nitrate in methanol to a concentration of about 20mmol / L, then add triethanolamine to an equal volume of methanol to a concentration of about 10mmol / L. After mixing evenly, inject carbon dioxide gas under stirring, centrifuge after forming white turbidity, and dry under reduced pressure at room temperature. After the solvent evaporates, high-purity calcium bicarbonate powder can be obtained.

[0045] The calcium bicarbonate powder prepared in this embodiment has also been characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and X-ray diffraction, which proves that the product is calcium bicarbonate nanopowder with a purity of 96%. The yield was 22% by gravimetric analysis.

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Abstract

The invention discloses a method for preparing calcium bicarbonate powder by a solvent method. The method comprises the following steps of (1) adding calcium salts into a solvent with the relative dielectric constant being smaller than 50 to obtain a solution A containing calcium ions, wherein the concentration of the calcium ions in the solution A is 1 to 140 mmol / L; (2) adding basic substances into the solvent with the relative dielectric constant being smaller than 50 to obtain a solution B, wherein the mol ratio of the basic substances in the solution B to the calcium salts in step (1) is(0.5 to 4):1; (3) after the solution A and the solution B are mixed, introducing carbon dioxide gas; performing centrifugation or filtering after white turbid liquid of calcium bicarbonate generated;after the solvent volatilization, obtaining calcium bicarbonate powder with the purity at least being 95 percent. The preparation method provided by the invention can be used for fast preparing the calcium bicarbonate by a one-step method; the problem that the calcium bicarbonate is difficult to synthesize in the solution is solved; the purity of the prepared calcium bicarbonate is at least 95 percent.

Description

technical field [0001] The invention relates to the field of synthesis of inorganic compounds, in particular to a method for preparing calcium bicarbonate powder by a solvent method. Background technique [0002] Calcium bicarbonate (Ca(HCO 3 ) 2 ) is a water-soluble, unstable inorganic compound with a relative molecular mass of 162.06. Calcium bicarbonate can be used as calcium fortifier, emulsion stabilizer, dough conditioner, nutritional supplement, buffer, loosening agent, surface improver nutritional supplement, yeast food, emulsifier, curing agent, antioxidant synergist ,stabilizer. However, the theoretical solubility of calcium bicarbonate is 16.6 g, and evaporating a solution of calcium bicarbonate will only convert it into calcium carbonate precipitate. So in theory, in aqueous solution, it is difficult to obtain high-purity calcium bicarbonate powder by means of recrystallization. In academic journals at home and abroad, only the aqueous solution of calcium bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2002/72C01P2002/82C01P2002/88C01P2004/03C01P2006/80
Inventor 刘昭明孔康任唐睿康
Owner ZHEJIANG UNIV
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