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Preparation method of calcium propionate by egg shell

A technology of calcium propionate and egg shells, which is applied in the field of preparing calcium propionate from egg shells, can solve the problems of low shell membrane separation efficiency, unstable product quality, incomplete neutralization reaction, etc., and reduce the time and cost of purification Low, formation-promoting and precipitation-promoting effect

Active Publication Date: 2012-09-19
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing calcium propionate by using egg shells, which belongs to the direct neutralization method, which solves the problems of low shell membrane separation efficiency, incomplete neutralization reaction, low propionic acid utilization rate and Unstable product quality and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method utilizing egg shells to prepare calcium propionate, comprising the steps of:

[0030] (1) Eggshell pretreatment:

[0031] Centrifuge the egg shells to remove residual egg whites, wash and dry, crush and sieve 100Kg egg shells to obtain 39 kg of egg shell powder, which is directly used for neutralization reaction to obtain 61 kg of coarse egg shells, and use the method in (2) for shell membrane separate.

[0032] (2) shell membrane separation:

[0033] Put 61kg of coarse eggshells to be separated in the mixer, add 732kg of water, start the mixer, the stirring speed is 600 rpm, after stirring for 10 minutes, let it stand for 5 minutes to obtain the bottom eggshell powder and the upper layer of eggshell The membrane liquid was separated by filtration, and the filtrate was dried to obtain the eggshell membrane, and 55.5 kg of filter residue was obtained at the same time. This part of the filter residue was combined with the eggshell powder in step (1), and a tota...

Embodiment 2

[0044] A method utilizing egg shells to prepare calcium propionate, comprising the steps of:

[0045] (1) Eggshell pretreatment is the same as in Example 1.

[0046] (2) shell membrane separation:

[0047] 61kg of coarse eggshell powder to be separated is placed in the mixer, then add 366kg of water, start the mixer, the stirring speed is 300 rpm, after stirring for 30 minutes, leave it for 5 minutes to obtain the bottom eggshell powder and the upper layer The eggshell membrane fluid was separated by filtration, and the filtrate was dried to obtain the eggshell membrane and 56.9 kg of filter residue. This part of the filter residue is combined with the eggshell powder in the step (1), totaling 95.9kg, for neutralization reaction.

[0048] (3) Neutralization reaction:

[0049] Add 95.9kg of eggshell powder and 768kg of water to the reaction kettle, stir and mix well, add a total of 173kg of propionic acid in two times within 30 minutes, react at 60°C for 3 hours, let stand f...

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PUM

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Abstract

The invention discloses a preparation method of calcium propionate by egg shell. The preparation method of calcium propionate by egg shell includes egg shell pretreatment, shell membrane separation, neutralization reaction, purification reaction, filtration, pH adjustment, concentration, drying and the like. Shell membrane separation is performed under physical mixing by adding water. Based on a direct neutralization method, secondary neutralization reaction method using egg shell powder to prepare calcium propionate is established. Sodium carboxymethylcellulose is used as flocculant for purification. Therefore, the prior art problems that egg membrane separation is poor in effect, neutralization reaction is incomplete, utilization rate of propionic acid is low, product quality is instable and the like are solved.

Description

technical field [0001] The invention relates to a method for preparing calcium propionate, in particular to a method for preparing calcium propionate by using egg shells. Background technique [0002] About 4 million tons of eggshells are produced in my country every year, and only a small amount is used as a calcium enhancer in fertilizers and feeds, and the rest are thrown away as waste, resulting in a large waste of resources and environmental pollution. Egg shells mainly contain CaCO 3 , and a small amount of MgCO 3 , Ca 3 (PO4) 2 , Mg 3 (PO 4 ) 2 And protein, low heavy metal content, eggshell membrane contains 70% protein and a small part of lipids, can be used in fields such as medicine, cosmetics and materials. [0003] Calcium propionate is an acid antifungal agent, which is non-toxic to the human body and has no side effects. It also has the effect of inhibiting the production of aflatoxin and has a certain detoxification effect. It can be widely used in the ...

Claims

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Application Information

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IPC IPC(8): C07C53/122C07C51/41C07C51/42
Inventor 马美湖蔡朝霞李涛周艳华耿放
Owner HUAZHONG AGRI UNIV
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