Preparation method and preparation system for sodium dihydrogen citrate

A technology of anhydrous citric acid and sodium citrate is applied in the directions of carboxylate preparation, carboxylate preparation, organic compound preparation, etc., and can solve the problems of long reaction time and drying time, low production cost and production efficiency, etc., Achieve the effect of shortening time and drying time, increasing the number of foams, and reducing production costs

Active Publication Date: 2018-04-20
NINGXIANG XINYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction time and drying time of the above preparation method are

Method used

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  • Preparation method and preparation system for sodium dihydrogen citrate
  • Preparation method and preparation system for sodium dihydrogen citrate
  • Preparation method and preparation system for sodium dihydrogen citrate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] Example 1

[0054] like figure 2 As shown, the present embodiment provides a preparation system of anhydrous monosodium citrate, comprising:

[0055] The neutralization tank 1, filter device 2, concentration tank 3, automatic centrifuge 4, vibrating fluidized bed dryer 5, micronizer 6, screen 7, packaging machine 8 connected in sequence;

[0056] The neutralization tank 1 is provided with a stirring device, a heating device and a feeding device;

[0057]The concentration tank 3 is provided with a stirring device, a heating device and a sampling port.

Example Embodiment

[0058] Example 2

[0059] like figure 1 As shown, the present embodiment adopts the preparation system of anhydrous monosodium citrate provided in Example 1, and provides a method for preparing anhydrous monosodium citrate with sodium citrate and citric acid as reaction raw materials. The preparation method specifically comprises the following steps:

[0060] A1, add 25% of the volume of purified water in the neutralization tank 1, and start stirring;

[0061] A2. Add sodium citrate into the neutralization tank 1, then raise the temperature to 70°C to fully dissolve it in purified water;

[0062] A3, then add citric acid in the neutralization tank 1 and make it fully dissolved;

[0063] Citric acid: the molar ratio of sodium citrate is 2:1; the purity of sodium citrate and citric acid is above 99%;

[0064] A4. After the feeding is finished, the materials are fully reacted for 1 hour according to the following reaction equation;

[0065] 2C 6 h 8 o 7 +C 6 h 5 o 7 Na...

Example Embodiment

[0073] Example 3

[0074] The difference between this embodiment and embodiment 2 is:

[0075] (1) Add 35% volume of purified water in A1, neutralization tank 1;

[0076] (2) A2, heat up to 75°C to fully dissolve the sodium citrate;

[0077] (3) A3, citric acid: the input molar ratio of sodium citrate is 2.5:1;

[0078] (4) A4, after feeding, the material reaction time is 2 hours; the reaction pH value is controlled at 2.8; the mass concentration of the control reaction solution is 1.26g / ml.

[0079] (5) A5, keeping the concentration tank 3 temperature at 80°C for crystallization for 5 hours;

[0080] (6) A7. The crystals are directly put into a vibrating fluidized bed dryer, and dried at 80° C. for 2 minutes.

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Abstract

The invention provides a preparation method and a preparation system for sodium dihydrogen citrate. The preparation method comprises the following steps: taking sodium citrate and citric acid as reaction raw materials, successively passing the raw materials through a neutralization tank for a neutral reaction, adjusting a pH value to 2.6 to 2.8 and filtering; enabling filtrate to enter a concentrating tank, keeping the temperature of the concentrating tank at 60 to 80 DEG C and carrying out crystallization reaction for 5 to 6 hours; after the crystallization reaction ends, carrying out solid-liquid separation by using an automatic centrifuge; enabling a crystal to directly enter a vibrating fluidized bed drier, drying at the temperature of 70 to 80 DEG C for 2 to 3 minutes, and removing surface water to directly obtain the sodium dihydrogen citrate; then crushing with a pulverizer and sieving through a 60-mesh sieve, thus obtaining a finished product. The invention further provides thepreparation system for the sodium dihydrogen citrate prepared according to the preparation method. According to the preparation method and the preparation system for the sodium dihydrogen citrate, disclosed by the invention, the sodium citrate and the citric acid are taken as the reaction raw materials, stable reaction and low heat release are realized; crystallization reaction time and drying time can be shortened, production cost can be reduced and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of production of chemical products, in particular to a preparation method and a preparation system of anhydrous monosodium citrate. The anhydrous monosodium citrate produced by the preparation method and the preparation system can be used as a foaming aid. Background technique [0002] Monosodium citrate, English name: Sodium citrate monobasic, CAS number: 18996-35-5, EC number: 242-734-6, molecular formula: C 6 h 7 NaO 7 , Molecular weight: 214.11, white granular crystal or crystalline powder, slightly deliquescent in humid air, easily soluble in water, almost insoluble in ethanol. Chinese aliases: monosodium citrate; sodium dihydrogen citrate; monosodium citrate anhydrous; monosodium citrate anhydrous. [0003] Monosodium citrate is a kind of surfactant, which improves the interface effect, emulsifies the raw materials in the foam plastics with a large difference in hydrophilicity and hydrophobicity int...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C51/42C07C51/43C07C59/265
CPCC07C51/412C07C51/42C07C51/43C07C59/265
Inventor 石志勇
Owner NINGXIANG XINYANG CHEM
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