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Continuous acidolysis process for calcium hydrogen citrate

A calcium hydrogen citrate, acid hydrolysis technology, applied in the separation/purification of carboxylic acid compounds, carboxylate preparation, etc., can solve the problems of uncontrollable calcium sulfate particle size, incomplete acid hydrolysis reaction, low concentration of acid hydrolysis solution, etc. problems, to achieve good energy saving and consumption reduction effects, easy comprehensive utilization, and high concentration

Active Publication Date: 2013-05-15
RIZHAO JINHE BOYUAN BIOCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been confirmed by many tests that the disadvantages of this method are incomplete acidolysis reaction, long acidolysis time, uncontrollable particle size of calcium sulfate obtained, cumbersome steps, large power consumption, and low concentration of acidolysis solution

Method used

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  • Continuous acidolysis process for calcium hydrogen citrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Calcium hydrogen citrate and concentrated sulfuric acid complete the instantaneous acidolysis reaction through the pulse jet reactor on their respective pipelines. The concentration of concentrated sulfuric acid is 90%, the pH value is controlled at 1.5, and the reaction temperature is 80°C;

[0020] 2. Add calcium hydrogen citrate and sulfuric acid to the crystallization tank for the acid solution to fine-tune the pH value and complete the crystallization process. The pH value is controlled at 1.0, and the crystallization temperature is 83°C;

[0021] 3. The crystal slurry liquid is classified into calcium sulfate particles in the crystal growth tank, and the fine particles are returned to the crystallization tank with a reflux ratio of 0.3. Coarse particles of 100-110 mesh enter the filtration section to complete solid-liquid separation, and the acidity of the obtained acid hydrolysis solution is 51.12%. .

Embodiment 2

[0023] 1. Calcium hydrogen citrate and concentrated sulfuric acid complete the instantaneous acidolysis reaction through the pulse jet reactor on their respective pipelines. The concentration of concentrated sulfuric acid is 98%, the pH value is controlled at 1.4, and the reaction temperature is 88°C;

[0024] 2. Add calcium hydrogen citrate and sulfuric acid to the crystallization tank for the acidolysis solution to fine-tune the pH value and complete the crystallization process. The pH value is controlled at 2.5, and the crystallization temperature is 80°C;

[0025] 3. The crystal slurry liquid is classified into calcium sulfate particles in the crystal growth tank, and the fine particles return to the crystallization tank with a reflux ratio of 0.4. The coarse particles of 90-100 mesh enter the filtration section to complete the solid-liquid separation, and the acidity of the obtained acid hydrolysis solution is 52.42%. .

Embodiment 3

[0027] 1. Calcium hydrogen citrate and concentrated sulfuric acid complete the instantaneous acidolysis reaction through the pulse jet reactor on their respective pipelines. The concentration of concentrated sulfuric acid is 94%, the pH value is controlled at 1.7, and the reaction temperature is 82°C;

[0028] 2. Add calcium hydrogen citrate and sulfuric acid to the crystallization tank for the acid solution to fine-tune the pH value and complete the crystallization process. The pH value is controlled at 3.0, and the crystallization temperature is 85°C;

[0029] 3. The crystal slurry liquid is classified into calcium sulfate particles in the crystal growth tank, and the fine particles return to the crystallization tank with a reflux ratio of 0.5. The coarse particles of 80-90 mesh enter the filtration section to complete the solid-liquid separation, and the acidity of the obtained acid hydrolysis solution is 50.42%. .

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Abstract

The invention relates to a continuous acidolysis process for calcium hydrogen citrate. The process mainly the following steps of: 1, respectively feeding calcium hydrogen citrate and concentrated sulfuric acid into a pulse jet reactor through pipelines for finishing an instantaneous acidolysis reaction in the reactor; 2, performing fine adjustment on the pH value of reaction solution in a crystallizer and finishing a crystallization process; and 3, finishing coarse-fine granule grading of the magma liquid in a maturing tank, and making the magma liquid enter a filtering process to finish solid-liquid separation. The process has the advantages of thorough reagent reaction, high automation degree, high acidity of acidolysis liquid, good crystal form of byproducts such as calcium sulphate, controllable granularity and the like.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and in particular relates to a continuous acidolysis process of calcium hydrogen citrate. Background technique [0002] Citric acid is the largest acid among organic acids. Due to its physical, chemical and derivative properties, it is widely used in food, medicine, daily chemical and other industries. Over the years, the world's demand for citric acid has been increasing day by day. As a major producer of citric acid, my country occupies an important position in the international market. At present, the calcium salt method is generally used in my country to produce citric acid, but this process is usually carried out in acid hydrolysis tanks, with intermittent operation and low degree of automation; since the mixing power mainly depends on the agitator, its power consumption is relatively large; due to adjustment Due to the limitation of slurry concentration, the concentration of the obtained...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/265C07C51/02C07C51/43
Inventor 寇光智丁兆堂于海彬周昊孙秀秀
Owner RIZHAO JINHE BOYUAN BIOCHEM
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