Method for preparing high-purity calcium gluconate from oyster shell

Abstract

The invention discloses a method for preparing calcium gluconate with high purity by utilization of oyster shells, which adopts a technical method that the oyster shells are cleaned, dried and comminuted to a grain size of 80 meshes to 120 meshes; under the conditions of constantly stirring and heating in water bath of 50 DEG C to 70 DEG C, the oyster shell powders are slowly added into a gluconic acid delta lactone solution and react for 2 hours to 5 hours, then a filtrate is subjected to vacuum concentration to a paste; and then edible alcohol is used for washing, crystal and recrystal are purified and finally the obtained crystal is dried to obtain white calcium gluconate with purity of more than 99 percent. The method has the advantages that the oyster shell powders do not need calcination and can be directly used for preparing the calcium gluconate which is the product with largest consumption for enriching the calcium in the human body; the adoption of the method of alcohol washing, crystallization and recrystallization not only can ensure that the calcium gluconate is white in color, but also can remove impurities. The purity of the product can achieve more than 99 percent so as to meet the requirements of calcium enriching products with high purity. The method is simple and practical, and has energy conservation and significant economic benefit.

Description

Technical field: [0001] The invention relates to comprehensive utilization of seafood processing waste and preparation technology of high-purity organic calcium, in particular to a method for preparing high-purity calcium gluconate from oyster shells. Background technique: [0002] Calcium is an important component of bones. When the human body lacks calcium, it can cause rickets in children, rickets in adults and osteoporosis in the elderly; in addition, calcium is also important for maintaining the normal physiological functions of the human body's circulation, breathing, endocrine, and immune systems. important role; therefore, the development of calcium supplement products has broad prospects. [0003] At present, there are many kinds of calcium-supplementing foods and calcium-containing preparations for clinical application, mainly derived from shells and fresh animal bones in the ocean. Oyster is an important marine economic shellfish in my country, with an annual out...

AI Technical Summary

Problems solved by technology

[0004] At present, raw materials such as oyster shells, egg shells, and scallop shells are mostly processed by calcination at home and abroad to prepare calcium supplement products, such as the Chinese patent "A method for preparing calcium gluconate with oyster shells (application number 200710164598.8)", which discloses oyster shells Acid hydrolysis, Na 2 CO 3 Solution precipitation, water washing to remove impurities, secondary calcination, and gluconic acid solution neutralization to prepare calcium gluconate, but the above method needs to be calcined twice, which consumes a lot of energy and the process is complicated

The Chinese patent "A method for preparing calcium propionate and calcium lactate using oyster shells as a calcium source (application number 200610104562.6)" introduces a non-calcination preparation technology, but the product purity is low, and it is impossible to prepare the largest amount of human calcium supplementation. Product—Calcium Gluconate