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Method for preparing organic acid and calcium sulfate whisker from organic acid calcium salt by hydrochloric acid method

A calcium sulfate whisker and calcium organic acid technology, which is applied in carboxylate preparation, organic chemistry, chemical instruments and methods, etc., can solve the problems of a large amount of waste, low utilization value, and environmental pollution, and achieve low cost and simple method , the effect of high aspect ratio

Pending Publication Date: 2019-08-02
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, calcium sulfate calcium whiskers are prepared from calcium sulfate fibrous single crystals synthesized from raw gypsum through a specific process and formula, or prepared in other forms. However, the calcium sulfate formed by the existing preparation methods is not a whisker. Waste slag has low utilization value, and a large amount of waste is generated during the preparation process, which pollutes the environment and increases production costs

Method used

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  • Method for preparing organic acid and calcium sulfate whisker from organic acid calcium salt by hydrochloric acid method

Examples

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preparation example Construction

[0021] As shown in the figure, a method for preparing organic acid and calcium sulfate whiskers from organic acid calcium salt by hydrochloric acid is characterized in that the preparation method is as follows: (1): the raw materials are organic acid calcium salt and hydrochloric acid, and the organic Calcium acid salt is mixed with hydrochloric acid to undergo a metathesis reaction, and the resulting mixed solution mainly contains organic acid, calcium salt of organic acid, calcium chloride and hydrochloric acid; (2): The mixed solution is solvent extracted with organic solvent to obtain raffinate and load organic Phase (I), the loaded organic phase (I) is washed to obtain a loaded organic phase (II), and the loaded organic phase (II) is back extracted to obtain an organic acid washing liquid and a blank organic phase; (3): the organic acid obtained in step (2) The washing liquid is decolorized, concentrated or crystallized to obtain an organic acid product; the raffinate obtai...

Embodiment 1

[0024] Take calcium citrate and hydrochloric acid for metathesis reaction. When the ratio of calcium ion concentration to hydrogen ion concentration is 1:6 and the temperature is 60℃, calcium chloride and citric acid are generated. The solution produced by the reaction is extracted by organic solvent to obtain calcium ions. The raffinate and the loaded organic phase (I) containing citric acid, the loaded organic phase (I) is washed to obtain the loaded organic phase (II), the loaded organic phase (II) is back extracted to obtain citric acid and the blank organic phase, the blank organic The phase can be reused in the extraction process. Citric acid is decolorized and concentrated to obtain citric acid products. The raffinate containing calcium ions is added with sulfuric acid or sulfate to react, wherein the concentration of free calcium ions and sulfate in the synthesis system is maintained within the range of 1.0mol / L; the reaction temperature is 80 ℃, and the reaction time is...

Embodiment 2

[0026] Take calcium monohydrogen citrate and hydrochloric acid for metathesis reaction. When the ratio of calcium ion concentration to hydrogen ion concentration is 1:2 and the temperature is 60℃, calcium chloride and citric acid are generated. The solution produced by the reaction is extracted by organic solvent to obtain The raffinate of calcium ions and the loaded organic phase (I) containing citric acid, the loaded organic phase (I) is washed to obtain the loaded organic phase (II), and the loaded organic phase (II) is stripped to obtain citric acid and a blank organic phase. The blank organic phase can be reused in the extraction process. The citric acid is decolorized and concentrated to obtain the citric acid product. The raffinate containing calcium ions is added with sulfuric acid or sulfate to react to maintain the concentration of free calcium ions and sulfate in the synthesis system. The range is 0.03 mol / L, the reaction temperature is optimized to 60 ℃, and the reac...

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Abstract

The invention relates to the technical fields of organic acid separation and whisker synthesis, in particular to a method for preparing an organic acid and a calcium sulfate whisker from organic acidcalcium salt by a hydrochloric acid method. The method is characterized by comprising the following steps: (1) taking organic acid calcium salt and hydrochloric acid as raw materials, mixing the organic acid calcium salt with hydrochloric acid to undergo a metathesis reaction to obtain a mixed solution which mainly contains the organic acid, the organic acid calcium salt, calcium chloride and hydrochloric acid; (2) performing solvent extraction on the obtained mixed solution by utilizing an organic solvent to obtain a raffinate and a supported organic phase (I), washing the supported organic phase (I) to obtain a supported organic phase (II), performing RP-extraction on the organic phase (II) to obtain an organic acid washing solution and a blank organic phase; and (3) concentrating or crystallizing the organic acid washing solution obtained in the step (2) to obtain an organic acid product, and reacting the raffinate obtained in the step (2) with sulfuric acid or sulfate to prepare the calcium sulfate whisker. The method has the advantages of zero waste, low cost, high length-diameter ratio of the prepared calcium sulfate whisker and the like.

Description

Technical field [0001] The invention relates to the technical field of organic acid separation and whisker synthesis, in particular to a simple method, no pollution, no waste, low cost, and a calcium sulfate organic acid calcium salt with a high aspect ratio of calcium sulfate whiskers prepared by a hydrochloric acid method Method for preparing organic acid and calcium sulfate whiskers. Background technique [0002] As we all know, calcium sulfate whiskers are a new type of needle-shaped, uniform cross-section, complete shape, and complete internal structure of fiber sub-nano materials grown in the form of single crystals. Its morphology is caused by the difference in the growth rate of the crystal in the axial direction and the side surface. The whiskers mainly grow along the axial direction of the spiral dislocation. The side surface is a low-energy surface, which grows very slowly, and diffuses through the surface to the tip or base surface of the whisker. The upper outcroppi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14C07C51/02C07C59/265C07C55/10C07C59/08C07C59/105C07C57/13C07C59/255C07C57/15C07C59/245
CPCC07C51/02C30B7/14C30B29/46C30B29/62C07C59/265C07C55/10C07C59/08C07C59/105C07C57/13C07C59/255C07C57/15C07C59/245
Inventor 任秀莲魏琦峰
Owner HARBIN INST OF TECH AT WEIHAI
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