A low-temperature granulating method of powdered lactic acid

A technology of powder lactic acid and low-temperature granulation, which is applied in the direction of liquid separation into beads and granulation, which can solve the problems of high energy consumption and difficult process, and achieve the effects of low total cost, improved equipment production efficiency, and reduced total energy consumption

Active Publication Date: 2014-10-29
武汉三江航天固德生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The semi-finished liquid lactic acid and calcium lactate mixture has a high moisture content, generally 24%; and the thermal efficiency utilization rate of dry and hot air in the drying process is only 17%, which consumes a lot of energy
[0005] 2. During the hot air drying process, since the moisture in the material needs to be vaporized and separated before the material can be solidified, the process is difficult, and the production capacity of the unit equipment is not higher than 2 kg / m3 of equipment space

Method used

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  • A low-temperature granulating method of powdered lactic acid

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Embodiment 1

[0022] A low-temperature granulation method for powdered lactic acid, comprising the following steps:

[0023] 1) Heat 900kg of lactic acid with a content of 99.5% to 95°C in a reaction tank, then add 97.6kg of calcium oxide, and add 2kg of silicon dioxide powder after fully reacting to obtain a mixed solution with the content of each component meeting the product requirements;

[0024] 2) Keep the temperature of the mixed solution at 95°C, and then transport the material to the upper nozzle of the fluidized bed spray granulator. After the material is mixed with compressed air at a pressure of 0.2Mpa at the double-layer nozzle, the liquid is sprayed in the form of mist. From the bottom of the granulator, cold air at 5°C is introduced from the bottom of the granulator to contact the sprayed liquid for heat exchange, and the temperature of the cold air drawn from the upper part of the granulator is controlled to be ≤40°C, and the mist liquid is cooled and solidified After that, ...

Embodiment 2

[0027] A low-temperature granulation method for powdered lactic acid, comprising the following steps:

[0028] 1) Heat 900kg of lactic acid with a content of 99.0% to 93°C in a reaction tank, then add 97.6kg of calcium oxide, and add 2kg of silicon dioxide powder after fully reacting to obtain a mixed solution with the content of each component meeting the product requirements;

[0029] 2) Keep the temperature of the mixed solution at 96°C, and then transport the material to the upper nozzle of the fluidized bed spray granulator. After the material is mixed with 0.2Mpa compressed air at the nozzle, the liquid will be sprayed out in the form of mist, from the granulator Cool air at 10°C is passed through the bottom of the granulator to exchange heat with the sprayed mist liquid, and the temperature of the cold air drawn from the top of the granulator is controlled to be ≤40°C, and the mist liquid falls to the ground after cooling and solidifying. The sieve bed at the lower part...

Embodiment 3

[0031] A low-temperature granulation method for powdered lactic acid, comprising the following steps:

[0032] 1) Heat 900kg of lactic acid with a content of 99.3% to 95°C in a reaction tank, then add 97.6kg of calcium oxide, and add 2kg of silicon dioxide powder after fully reacting to obtain a mixed solution with the content of each component meeting the product requirements;

[0033] 2) Keep the temperature of the mixed solution at 95°C, and then transport the material to the upper nozzle of the fluidized bed spray granulator. After the material is mixed with compressed air at a pressure of 0.2Mpa at the double-layer nozzle, the liquid is sprayed in the form of mist. From the bottom of the granulator, cold air at 14°C is introduced from the bottom of the granulator to contact the sprayed liquid for heat exchange, and the temperature of the cold air drawn from the upper part of the granulator is controlled to be ≤40°C, and the mist liquid is cooled and solidified After that,...

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Abstract

A low-temperature granulating method of powdered lactic acid is provided. The method includes following steps: 1) heating 900 parts by weight of lactic acid having a content higher than 99% in a reactor to 90-95 DEG C, adding 97.6 parts by weight of calcium oxide, and adding 2 parts by weight of silicon dioxide powder after the calcium oxide is fully reacted to obtain a mixed solution; and 2) maintaining the temperature of the mixed solution to be higher than 95 DEG C, conveying the material to nozzles at the upper part of a fluidized bed spraying granulator, mixing the material with compressed air having a pressure of 0.2 MPa at the double-layer nozzles, spraying the solution in a vaporific manner, feeding cold air having a temperature of 4-14 DEG C from the lower part of the granulator so that the cold air and the vaporific solution are in contact and subjected to heat exchange, controlling the temperature of the cold air when the cold air is discharged from the upper part to be not higher than 40 DEG C, allowing the vaporific solution to fall to a sieve plate bed under the granulator after the vaporific solution is cooled and cured, and enriching to obtain the powdered lactic acid. By adoption of low-temperature granulating, the production efficiency is high, the thermal energy utilization rate is largely increased, and the method is suitable for popularization and production.

Description

technical field [0001] The invention relates to the field of lactic acid products, in particular to a low-temperature granulation method for powdered lactic acid. Background technique [0002] Lactic acid and calcium lactate are widely used in the food and pharmaceutical industries, but since lactic acid is liquid, it is inconvenient to mix it with solid calcium lactate in solid products. Generally, the mixture particles of solid powdery lactic acid and calcium lactate with little moisture are prepared by granulating the mixture, which is called powdered lactic acid. The traditional powder lactic acid manufacturing process is to enter 80% of the national standard lactic acid and calcium lactate pentahydrate into the fluidized bed of the drying tower. , to make it into powder, among which the Chinese standard lactic acid refers to the lactic acid fixed in accordance with GB2023-2003. [0003] The disadvantage of this process method is: [0004] 1. The semi-finished liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/04
Inventor 赵文胜谢剑宏张金彬梁庭德徐仁义
Owner 武汉三江航天固德生物科技有限公司
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