A preparation method of sodium citrate with specific particle size

By optimizing the pretreatment and crystallization process of sodium citrate, combined with real-time monitoring and control of the online particle size measuring instrument, the problems of uneven particle size and low purity of sodium citrate products in the prior art are solved, and high-purity and uniform particle size product preparation is achieved, meeting market demand and reducing production costs.

CN115974680BActive Publication Date: 2025-05-13RIZHAO JINHE BOYUAN BIOCHEM
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Patent Information

Application Number
CN202211727057.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-26
Publication Date
2025-05-13
Estimated Expiration
2042-12-26

AI Technical Summary

Technical Problem

In the prior art, when preparing sodium citrate crystals, the particle size of the product is uneven, the purity is low, and the crystal grains are poorly formed, which makes it difficult to meet the special market requirements for particle size, resulting in increased production costs and decreased product quality.

Method used

By optimizing the pretreatment process and crystallization process conditions of sodium citrate, including controlling the neutralization reaction speed and pH stability, performing precision filtration to remove impurities, adjusting the evaporation and concentration conditions of the crystallizer and layered screening of the crystallizer, it is equipped with an online particle size measuring instrument to monitor and control the particle size in real time.

Benefits of technology

It has achieved concentrated particle size distribution, high purity, and rules for particle forming of sodium citrate products, which can meet the special market requirements for particle size, reduce the reinvestment of unqualified products, reduce production costs, and improve production efficiency.

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Abstract

The invention belongs to the technical field of preparing sodium citrate, and specifically relates to a method for preparing sodium citrate with a specific particle size. The method comprises the following steps: a sodium citrate solution obtained by a neutralization reaction of citric acid and sodium hydroxide is sent into a crystallizer after precision filtration for continuous concentration, evaporation and crystallization to obtain sodium citrate slurry, the sodium citrate slurry is discharged into a primary slurry tank with stirring, and then overflows into a secondary slurry tank, and then the slurry is returned to the crystallizer for secondary growth, an online particle size measuring instrument is provided on the primary slurry discharge, and when the crystal reaches the particle size requirement, the reflux is closed for centrifugal discharge, and drying is performed to obtain a sodium citrate product with uniform particles, concentrated particle size distribution and good anti-caking ability. The sodium citrate product obtained by the invention can meet the market requirements for product particle size, and at the same time can reduce the processes of return investment, material treatment and the like due to unqualified product particle size, reduce energy consumption, and improve the production efficiency of sodium citrate.
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Citation Information

Patent Citations

  • Production device for controlling granularity of sodium citrate

    CN217409792U