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Process for preparing large grained food-grade calcium hydrogen phosphate

A calcium hydrogen phosphate and preparation process technology, applied in the direction of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of dehydration, drying and other follow-up procedures, fine calcium hydrogen phosphate particles, easy to fly dust and other problems, and achieve easy Filtration and drying, good quality, simple process effect

Inactive Publication Date: 2010-07-14
LIANYUNGANG SHUREN KECHUANG FOOD ADDITIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium hydrogen phosphate particles produced by ordinary processes are too fine, which brings difficulties to subsequent processes such as dehydration and drying.
At the same time, the fluidity of the product is poor, it is easy to fly dust during use, and the loss is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. A kind of preparation technology of large particle food grade calcium hydrogen phosphate, its step is as follows:

[0018] (1) Reaction: the raw material food-grade calcium carbonate is prepared as a calcium carbonate suspension with a mass concentration of 30% by water, and the calcium carbonate suspension and raw material food-grade phosphoric acid are added to the DTB crystallizer in a continuous feed mode to react, The molar ratio of food-grade calcium carbonate and food-grade phosphoric acid added is 1:1; the stirring speed of the DTB crystallizer is 1000r / min during the reaction, and the reaction mother liquor overflowing from the top of the DTB crystallizer with entrained particles is added in circulation In the crystallizer; the pH value of the reaction material in the DTB crystallizer is 6; The mass ratio of the add-on of circulating mother liquor and food grade calcium carbonate is 6: 1; The average residence time of reaction material in the DTB cry...

Embodiment 2

[0020] Example 2. A kind of preparation technology of large particle food grade calcium hydrogen phosphate, its step is as follows:

[0021] (1) Reaction: the raw material food grade calcium carbonate is prepared as a calcium carbonate suspension with a mass concentration of 20% with water, and the calcium carbonate suspension and raw material food grade phosphoric acid are added to the DTB crystallizer in a continuous feed mode to react, The molar ratio of food-grade calcium carbonate and food-grade phosphoric acid added is 1:1; the stirring speed of the DTB crystallizer is 800r / min during the reaction, and the reaction mother liquor overflowing from the top of the DTB crystallizer with entrained particles is added in circulation In the crystallizer; the pH value of the reaction mass in the DTB crystallizer is 5; the mass ratio of the add-on of circulating mother liquor and food grade calcium carbonate is 4: 1; The average residence time of reaction mass in the DTB crystalliz...

Embodiment 3

[0023] Example 3. A kind of preparation technology of large particle food grade calcium hydrogen phosphate, its step is as follows:

[0024] (1) Reaction: the raw material food grade calcium carbonate is prepared as the calcium carbonate suspension of 25% by water, and the calcium carbonate suspension and raw material food grade phosphoric acid are added to the DTB crystallizer in a continuous feed mode to react, The molar ratio of food-grade calcium carbonate and food-grade phosphoric acid added is 1:1; the stirring speed of the DTB crystallizer is 900r / min during the reaction, and the reaction mother liquor overflowing from the top of the DTB crystallizer with entrained particles is added in circulation In the crystallizer; The pH value of the reaction material in the DTB crystallizer is 5.5; The mass ratio of the add-on of circulating mother liquor and food grade calcium carbonate is 5: 1; The average residence time of reaction material in the DTB crystallizer is 45 minutes...

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Abstract

The invention relates to a process for preparing large grained food-grade calcium hydrogen phosphate. The process is characterized by comprising the following steps of: adding calcium carbonate suspensoid and phosphoric acid in a continuous charging mode to a DTB crystallizer to react, wherein the mol ratio of the calcium carbonate to the phosphoric acid is 1:1 and the stirring speed of the DTB crystallizer during the reaction is 800-1000 r / min; circularly adding the reaction mother solution with grains to the crystallizer, wherein the reaction mother solution overflows out of the top of the DTB crystallizer, the pH value of the reaction materials in the DTB crystallizer is 5-6, and the mean residence time of the reaction materials in the DTB crystallizer is 40-50 minutes; centrifugating and drying; and continuously discharging the calcium hydrogen phosphate generated by the reaction from the bottom via the depression area at the lower part of the DTB crystallizer, centrifugating and drying to obtain a finished product. The process has the advantages of simple flow and convenient operation, and the produced calcium hydrogen phosphate has the advantages of large grain, good quality and easy filtration and drying.

Description

technical field [0001] The invention relates to a preparation method of calcium hydrogen phosphate, in particular to a preparation process of large-grain food-grade calcium hydrogen phosphate. Background technique [0002] As a food additive, phosphate is widely used in various flour products, dairy products, frozen foods and other foods at home and abroad. Phosphorus and calcium are two important elements in organisms, which can promote the metabolism of organisms, and are important constituent elements of bones, hormones, enzymes, vitamins, etc. At present, the preparation of food-grade calcium hydrogen phosphate mainly adopts double decomposition method and direct neutralization method. However, the calcium hydrogen phosphate particles produced by ordinary processes are too fine, which brings difficulties to subsequent processes such as dehydration and drying. At the same time, the fluidity of the product is poor, and it is easy to fly dust during use, resulting in larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 李明达尹继广祝桂林张浩
Owner LIANYUNGANG SHUREN KECHUANG FOOD ADDITIVE