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Method for preparing calcium gluconate from oyster shell

A technology of calcium gluconate and gluconic acid, which is applied in the field of preparation of organic calcium, can solve the problems of impact, low purity of organic calcium, unfavorable consumption, etc.

Inactive Publication Date: 2008-07-02
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the purity of organic calcium obtained by the above method is low, and the content of impurity ions such as lead, copper, cadmium and zinc is relatively high, which has adverse effects on human consumption.

Method used

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Examples

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Embodiment 1

[0023] A kind of method preparing calcium gluconate with oyster shell, comprises the steps:

[0024] a. Calcining clean oyster shells at a high temperature of 950° C. for 2 hours to obtain shell ash;

[0025] b. Grind the above-mentioned shell ash and sieve it with a 120-mesh sieve, weigh after removing large particles, add 9.3ml of HCl solution with a molar concentration of 4mol / L in each gram of shell ash, stir, fully acidolyze, filter, get the filtrate;

[0026] c. Add Na with a molar concentration of 1mol / L to the filtrate 2 CO 3 solution, Na in each gram of shell ash 2 CO 3 The added amount of the solution is 19.3ml, let it settle for 0.5-1 hour, and centrifuge to obtain the precipitate;

[0027] d. The precipitate is fully washed with distilled water of 2-5 times the weight of the precipitate, left to settle, and centrifuged to obtain the impurity-removed precipitate; in this way, water-soluble salts can be removed;

[0028] e. drying the impurity-removed precipita...

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Abstract

The invention discloses a method for preparing calcium gluconate with an oyster shell; the oyster shell is acid split by 4mol / L of HCI solution, precipitated with 1mol / L of Na2CO3 solution, washed, purified, second calcinated and the prepared into Ca (OH) 2 emulsion with 0.7-1.5mol / L of molar concentration carries out neutrallzation reaction with 20-30 percent gluconate solution in weight percentage, thus obtaining the calcium gluconate. Calcium citrate powder prepared has over 98 percent of purity, and content of foreign ions, such as copper, lead and cadmium, etc. is low. The calcium citrate powder obtained completely meets national requirement for food, and can be further made into calcium supplement food or health products, thus providing strong material basis for solving the problem of calcium supplement.

Description

technical field [0001] The invention relates to the preparation of organic calcium, in particular to a method for preparing calcium gluconate from oyster shells. Background technique [0002] Calcium is the main component of bones and teeth. Calcium ions can regulate the acid-base balance of the human body. Sufficient calcium keeps the body fluids slightly alkaline, prevents cancer, and has a good therapeutic effect on rickets, osteoporosis and other diseases. Shells such as oyster shells are rich in CaCO 3 , is an important natural source of calcium. Therefore prepare calcium agent from shell etc. and become people's focus, be 200610077509.1 as the Chinese patent application number, the name is called " with oyster shell, flower clam shell, egg shell and citric acid reaction make calcium supplement " application for a patent of invention, just It is disclosed that the above-mentioned shell is used as a raw material to be calcined at a temperature of 500-1200°C, and the ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/105C07C51/41
Inventor 李和生江磊
Owner NINGBO UNIV
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