Method for preparing calcium propionate

A technology of calcium propionate and propionic acid, applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation and other directions, can solve the problems of poor control of reaction solubility, influence of purity, inferior appearance, etc., and achieve a good parallel The effect of reaction selectivity and safety, high product purity, and simple process

Inactive Publication Date: 2014-04-09
NANTONG ALCHEMY BIOTECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the equipment for large-scale production of calcium propionate at home and abroad is a general enamel reaction kettle, and the process of its mature technology is roughly as follows: that is, take propionic acid and calcium hydroxide or Na 2 CO 3 Neutralization reaction, and then through evaporative crystallization, dehydration, drying, packaging and other processes to obtain finished products. However, since each reactant is added at one time during the reaction process, the reaction solubility is not easy to control, and side reactions are prone to occur, and the yield is not high. Purity is also affected, and the appearance is inferior
Therefore, the existing technology and equipment for the production of calcium propionate need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 3250Kg deionized water into Al 2 o 3 -ZrO 2 In the prepared ceramic membrane chemical reactor, put 35kg of propionic acid into the membrane chemical reactor at 50-80°C, then put 10kg of calcium hydroxide into the membrane chemical reactor, repeat the above action 3 times, and then put in 10kg of hydrogen Calcium oxide, during the input process of the last batch of calcium hydroxide, test the pH value of the neutralizing solution several times, control the feeding speed and amount of the remaining calcium hydroxide according to the pH value, and stop feeding when the pH value reaches 6.4-8.0.

[0023] (2) After feeding, keep the reaction solution at a temperature of 70-80°C for 30-40 minutes, check the pH value of the reaction solution for 5-15 minutes during the heat preservation period, and add propionic acid to the reaction solution according to the change of the pH value or calcium hydroxide, the pH of the reaction solution is adjusted to be 6.4 to 8.0.

[002...

Embodiment 2

[0032] Put 3250Kg deionized water into Al 2 o 3 -ZrO 2 In the prepared ceramic membrane chemical reactor, put 35kg of propionic acid into the membrane chemical reactor at 50-80°C, then put 10kg of calcium hydroxide into the membrane chemical reactor, repeat the above action 3 times, and finally put 10kg Calcium hydroxide, during the input process of the last batch of calcium hydroxide, test the pH value of the neutralizing solution several times, control the feeding speed and amount of the remaining calcium hydroxide according to the pH value, stop feeding when the pH value reaches 6.5, and the rest of the process With embodiment 1.

[0033] The calcium propionate prepared in this example has a white appearance, and the purity of the finished product is 99.91%.

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Abstract

The invention discloses a method for preparing calcium propionate in a film chemical reactor. The method comprises the following steps: alternatively feeding calcium hydroxide and propanoic acid in the mass ratio of 1:3.5-1:3.7 into the film chemical reactor filled with deionized water in batches at the temperature of 50-80 DEG C till the pH value of a formed reaction solution is 6.4-8.0; after feeding, preserving heat of the reaction solution at the temperature of 70-80 DEG C for 30-40 minutes, and controlling the pH value of the reaction solution at 6.4-8.0; reacting in the film chemical reactor, and performing filter pressing, crystallization, dehydration and drying to obtain calcium propionate powder. The calcium propionate powder prepared by using the film chemical reactor is simple in process and has high parallel reaction selectivity and safety, and 'three wastes' are hardly produced in a production process. Moreover, the produced calcium propionate has a white appearance, is over 99.8 percent in purity, and is stable in quality.

Description

technical field [0001] The invention relates to a method for producing calcium propionate, in particular to a method for producing calcium propionate with a membrane chemical reactor. Background technique [0002] Calcium propionate is a relatively new food antifungal agent. It is the calcium salt of acidic antifungal agent propionic acid. It is white crystal or powder, odorless or slightly specific propionic acid smell, stable to light and heat, and hygroscopic. Soluble in water, the aqueous solution is weakly alkaline, slightly soluble in methanol and ethanol, insoluble in benzene and acetone. It is easy to deliquescence in humid air, loses crystal water when heated to 120°C, undergoes phase transition at 200-210°C, and decomposes into calcium carbonate at 330-340°C. Under acidic conditions, free propionic acid is produced, which is weaker than sorbic acid and stronger than acetic acid. It has antibacterial effect and has inhibitory effect on Aspergillus niger and Bacillu...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C07C51/41C07C53/122
CPCC07C51/412C07C53/122
Inventor许卫东卞杨伟
OwnerNANTONG ALCHEMY BIOTECH DEV