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Method of preparing calcium propionate and calcium lactate with oyster shell as calcium source

A technology of oyster shells and calcium propionate, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of high energy consumption, secondary pollution, and high cost, and achieve low energy consumption, low production cost, and low raw material purchase cost Effect

Inactive Publication Date: 2007-03-14
SHANXI JINRI BIOCHEM IND TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention solves the problems of large energy consumption, high cost and secondary pollution in the production of existing calcium propionate and calcium lactate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The oyster shells are washed, dried, and crushed to a fineness of less than 74 μm (through a 200-mesh sieve).

[0031] Add 50g of 200 mesh oyster shell powder and 200mL of water into a 2000mL three-neck flask, and add 670mL of propionic acid solution with a concentration of 10% in batches at 35°C under mechanical stirring (stirring speed is about 120r / min), and stir for 2.5h , with Ca(OH) 2 The pH of the reaction system was adjusted to about 9.0, and the reaction was continued for 1 h.

[0032] The reacted material was suction filtered under reduced pressure, and the filter residue was dried and weighed, and used as a raw material for re-feeding and reaction. The filtrate was concentrated to nearly dryness, and the crystals were dried at 80° C. to 85° C. for 4 hours to obtain 73 g of the product calcium propionate with a yield of 95%.

Embodiment 2

[0034] The oyster shells are scrubbed clean, dried, and crushed to a fineness of less than 154 μm (through a 100-mesh sieve).

[0035] Add 720g of 17% propionic acid solution into a 1000mL three-necked flask, and continuously add 100g of oyster shell powder with a fineness of 100 mesh at 20°C under mechanical stirring (stirring speed is about 140r / min), and stir for 1.5h. The pH of the reaction system was adjusted to about 8.0, and the reaction was continued for 1.5 h.

[0036] The reacted material was suction filtered under reduced pressure, and the filter residue was dried and weighed, and used as a raw material for re-feeding and reaction. The filtrate was concentrated to nearly dryness, and the crystals were dried at 100° C. to 105° C. for 2 hours to obtain 141 g of the product calcium propionate with a yield of 95%.

Embodiment 3

[0038] The oyster shells are scrubbed clean, dried, and crushed to a fineness of less than 100 μm.

[0039] Add 60kg and 260L of oyster shell powder into a 2000L stainless steel reaction kettle, add 800L of propionic acid solution with a concentration of 9% in batches at 50°C under mechanical stirring, stir for 2.5 hours, and use Ca(OH) 2 The pH of the reaction system was adjusted to about 8.0, and the reaction was continued for 1.5 h.

[0040] The reacted material is filtered under reduced pressure, and the filter residue is used as a raw material for re-feeding reaction. The filtrate was concentrated under reduced pressure to 20% (w / w), and the solution obtained was spray-dried (spray-drying conditions: feed concentration 20%, flow rate 30L / h, inlet temperature 200°C, outlet temperature 80°C), to obtain white calcium propionate Powder 85kg, finished product packaging is 25kg / bag.

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PUM

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Abstract

The present invention relates to chemical technology, and is especially process of preparing calcium propionate and calcium lactate with oyster shell as calcium source. Oyster shell after being washed, stoved and crushed is made to react chemically with propionic acid and lactic acid to produce calcium propionate and calcium lactate. The preparation process has chemical reaction at 20-60 deg.c for 2-4.5 hr without high temperature calcining and without adding other chemical matter, and has no destroy to amino acid, unsaturated fatty acid, inorganic matter, trace elements and other beneficial matter. The present invention can eliminate environmental pollution caused by oyster shell and has no secondary pollution.

Description

Technical field: [0001] The invention relates to the technical fields of chemical treatment and chemical production. Specifically relates to a method for preparing calcium propionate and calcium lactate by using oyster shells as a calcium source. technical background: [0002] Oysters are loved by consumers for their delicious taste and rich nutrition, but when people eat oysters or process shellfish, a large amount of oyster shells are produced, and this waste is as high as several million tons every year. If it is not fully utilized , not only will cause serious pollution to the environment, but also a serious waste of resources. Oyster shells contain approximately 95% calcium carbonate and are a natural, organism-produced source of calcium. Japanese food experts have developed the use of natural calcium agent oyster shells as food preservatives. It grinds oyster shells and heats them to make 320-mesh calcium agents. It can be used to improve the shelf life of vegetables...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C07C53/122C07C59/08
Inventor 张群正丁西平王枫李小玲董岩
Owner SHANXI JINRI BIOCHEM IND TECH DEV
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