Method for preparing calcium salt by using shell as raw material

A shell and calcium salt technology, applied in carboxylate preparation, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of long reaction time, low concentration of calcium lactate and calcium propionate solution, high energy consumption in the process of concentrated crystallization, etc. , to reduce energy consumption, reduce equipment investment and production costs, and speed up the response

Inactive Publication Date: 2008-07-09
ZHONGKAI UNIV OF AGRI & ENG
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Problems solved by technology

CN 1927803 A uses oyster shells to directly react with acid to prepare calcium lactate and calcium propionate. The disadvantage is that oyster shells need to be crushed to more than 100 mesh, and the concentration of acid is lower than 25%, resulting in the concentration of calcium lactate and calcium propionate solution obtained. Low, the energy consumption of concentrated crystallization process is bigger; CN 1039196 C uses acetic acid to directly react with shells to prepare calcium acetate, but the reaction time is longer; CN 1060156 C uses acetic acid to directly react with shells to prepare calcium acetate, and the reaction time is as long as 24 hours , and shells must be crushed to less than 500 microns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 97 kilograms of oyster shells were crushed into 20-mesh particles, and prepared as a suspension with 520 kilograms of water. Under the condition of stirring, 46 kg of 40% propionic acid was added dropwise into the suspension, and 20 kHz ultrasonic radiation was used at the same time to carry out the chemical reaction at normal temperature. After the reaction was completed, the pH value of the reaction liquid was adjusted to 6.9 with calcium hydroxide, then filtered, the filtrate was concentrated and crystallized, and dried to obtain 23.8 kg of calcium propionate with a water content of 2.3%, which was analyzed in accordance with GB 6225-86 Food Additive C calcium propionate and HG 2921-1999 food additive calcium propionate quality technical index requirements.

Embodiment 2

[0012] 78 kilograms of scallop shells were crushed into 100-mesh particles, and prepared as a suspension with 320 kilograms of water. With stirring, 122 kg of 32% phosphoric acid was added dropwise to the suspension, and at the same time 40 kHz ultrasonic radiation was used to carry out chemical reaction at normal temperature. After the reaction is completed, adjust the pH value of the reaction liquid to 6.9 with calcium oxide, filter, concentrate and crystallize the filtrate, and dry to obtain 55.5 kg of calcium hydrogen phosphate, with a water content of 2.0%, which meets the requirements of GB 1889-2004 Food Additive Hydrogen Phosphate Calcium quality technical index requirements.

Embodiment 3

[0014] 83 kilograms of clam shells are crushed into 40 mesh particles, and prepared as a suspension with 531 kilograms of water. Under the condition of stirring, 42 kg of 57% acetic acid was added dropwise into the suspension, and 20 kHz ultrasonic radiation was used at the same time to carry out the chemical reaction at normal temperature. After the reaction is completed, adjust the pH value of the reaction liquid to 6.9 with calcium hydroxide, then filter, concentrate and crystallize the filtrate, and dry to obtain 32.3 kg of calcium acetate with a water content of 2.1%. After analysis, it meets the requirements of GB 15572-1995 Food Additive Calcium Acetate The quality and technical index requirements.

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Abstract

The invention belongs to multipurpose use of natural waste and the technical field of chemical production. The invention discloses a method for producing calcium salt by using wasted shell discarded from fishery product processing. The method comprises that the wasted shell of fishery product processing is directly reacted with acid at normal temperature after being cleaned, air-dried and pulverized, and the calcium salt is obtained through the steps of filtering, activated carbon adsorption, concentration, crystallizing and the like. To accelerate reaction speed and to cause complete reaction and improve percent conversion of relatively high-priced acid, ultrasonic radiation reaction system is used at the same time with that of reaction. Compared with the prior art, the invention does not need to calcine the shell at high-temperature, which is helpful to decrease energy consumption and production cost. The ultrasonic radiation reaction system can accelerate the reaction speed and improve percent conversion of acid to 100%. The invention not only can resolve environmental pollution problems resulting from wasted shell of fishery product processing and does not produce secondary pollution, but also can largely improve economic value of wasted shell of fishery product processing.

Description

Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of natural wastes and chemical production, and in particular relates to a method for producing calcium salts by using discarded shells from aquatic product processing as raw materials. Background technique: [0002] With the vigorous development of my country's aquaculture industry and aquatic product processing industry, a large number of discarded shells after aquatic product processing are produced every year. If these discarded shells are not utilized, it will not only reduce the economic value of aquatic products, but also pollute the environment. Calcium salt is a widely used feed additive and food additive. For example, calcium propionate is a good antifungal agent for food and feed. Calcium hydrogen phosphate is not only a good calcium and phosphorus supplement, but also an excellent toothpaste abrasive. Since the main component of seashells is calcium carbonate, using ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C01B25/32
Inventor 黎新明崔英德尹国强张翠荣廖列文贾振宇毛淑才胡文斌陈循军
Owner ZHONGKAI UNIV OF AGRI & ENG
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