Method for producing anhydrous citric acid crystal through inducing graining by continuous evaporation

An anhydrous citric acid and evaporation-induced technology, applied in the field of food chemical industry, can solve the problems of irregular crystal shape, uneven particle size and high production cost, and achieve the effects of uniform and complete size, low crystal moisture content and stable product quality.

Inactive Publication Date: 2013-05-08
YIXING UNION BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] 1. From the point of view of the production process: due to the rapid crystallization, small crystal particles, and a large amount of water on the surface, the water content needs to be repeatedly centrifuged to reach the standard (it takes 4~5h). In addition, the fine crystals gather into crystal clusters, and the particle size is different Uniformity, easy to cause unstable working current of the centrifuge, low centrifugation efficiency, and a long time (about 12 hours) for each crystallization system to stabilize. On the other hand, the production process parameters (such as the number of crystal nuclei, crystal growth speed, crystal growth time, crystal growth speed) are difficult to control, and the product quality is unstable
[0007] 2. From the perspective of product quality: the crystal particles are small and there are large crystal clusters, the crystal shape is irregular, the dust is large, the water content is high, and the output is low

Method used

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  • Method for producing anhydrous citric acid crystal through inducing graining by continuous evaporation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The concrete production method of present embodiment is as follows:

[0031] (1) Double-effect evaporation and concentration: the citric acid purified liquid from the citric acid production workshop is first passed into the refining storage tank 1, and after a short stay and buffer in it, it is pumped by the water pump 10 into one of the double-effect falling film evaporators. Efficient evaporator 2, evaporate and concentrate to a solution density of 1215kg / m under the conditions of vacuum degree -0.042kPa and temperature 78°C 3 , to obtain the citric acid first-effect evaporation concentrate; the concentrate then enters the second-effect evaporator 3, and evaporates and concentrates to a solution density of 1330kg / m under the conditions of a vacuum degree of -0.085kPa and a temperature of 56°C 3 , to obtain the citric acid two-effect evaporation concentrate.

[0032] (2) Filtration to remove impurities: the second-effect evaporation concentrate obtained in step (1) pa...

Embodiment 2

[0038] The concrete production method of present embodiment is as follows:

[0039] (1) Double-effect evaporation and concentration: the citric acid purified liquid from the citric acid production workshop is first passed into the refined storage tank 1, and after a short stay and buffer in it, it is pumped into the first-effect double-effect falling-film evaporator by the water pump 10 Evaporator 2, under the conditions of vacuum degree -0.045kPa and temperature 80°C, evaporate and concentrate to a solution density of 1220kg / m 3 , to obtain the citric acid first-effect evaporation concentrate; the concentrate then enters the second-effect evaporator 3, and evaporates and concentrates under the conditions of vacuum degree -0.088kPa and temperature 60°C until the solution density is 1332kg / m 3 , to obtain the citric acid two-effect evaporation concentrate.

[0040] (2) Filtration to remove impurities: the second-effect evaporation concentrate obtained in step (1) passes through ...

Embodiment 3

[0046] The concrete production method of present embodiment is as follows:

[0047] (1) Double-effect evaporation and concentration: the citric acid purified liquid from the citric acid production workshop is first passed into the refined storage tank 1, and after a short stay and buffer in it, it is pumped into the first-effect double-effect falling-film evaporator by the water pump 10 Evaporator 2, under the conditions of vacuum degree -0.005kPa and temperature 85°C, evaporate and concentrate to a solution density of 1250kg / m 3 , to obtain the citric acid first-effect evaporation concentrate; the concentrate then enters the second-effect evaporator 3, and evaporates and concentrates to a solution density of 1333kg / m under the conditions of a vacuum degree of -0.090kPa and a temperature of 65°C 3 , to obtain the citric acid two-effect evaporation concentrate.

[0048] (2) Filtration to remove impurities: the second-effect evaporation concentrate obtained in step (1) passes t...

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Abstract

The invention discloses a method for producing anhydrous citric acid crystal through inducing graining by continuous evaporation. The method comprises the following steps of: (1) carrying out double-effect evaporation and concentration; (2) inducing graining by vacuum evaporation, under the conditions of the vacuum degree of -0.092 to -0.095kPa and the temperature of 50-55 DEG C, heating and evaporating the concentrated solution till the density is 1360-1390kg/m<3>, adding 30-60 meshes anhydrous citric acid seed crystal to induce graining; (3) growing the grain; (4) separating the crystals; (5) drying, and obtaining the anhydrous citric acid crystal. The method is simple in technological operation, high in production efficiency, energy-saving and time-saving, moreover, the product is uniform in size and integral, the crystalline form is consistent, the moisture content is low, and the quality is steady, so that the method is suitable for industrial continuous production.

Description

technical field [0001] The present invention relates to the production method of anhydrous citric acid crystal, be specifically related to adopting continuous reduced pressure evaporation to induce [0002] The invention discloses a method for producing anhydrous citric acid crystals by crystallization, which belongs to the field of food chemical industry. Background technique [0003] Anhydrous citric acid is a very important organic acid. It is mainly used as sour agent, flavoring agent, preservative and preservative in food and beverage industries. It is also used as antioxidant and plasticizer in chemical industry, cosmetic industry and washing industry. Agents, detergents. my country is a major producer of anhydrous citric acid, with an annual output of more than 800,000 tons. In recent years, with the increasing demand for anhydrous citric acid in the international and domestic markets, the requirements for product quality and appearance have become more stringent. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/43
Inventor 胡志杰蒋小东张明赵隽峰唐文健许兆平毛鸿浩孙福新
Owner YIXING UNION BIOCHEM
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