CN101863756A - Process for producing disodium citrate - Google Patents
Process for producing disodium citrate Download PDFInfo
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- CN101863756A CN101863756A CN201010221023A CN201010221023A CN101863756A CN 101863756 A CN101863756 A CN 101863756A CN 201010221023 A CN201010221023 A CN 201010221023A CN 201010221023 A CN201010221023 A CN 201010221023A CN 101863756 A CN101863756 A CN 101863756A
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- disodium citrate
- crystallization
- sodium hydroxide
- disodium
- citric acid
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Abstract
The invention discloses a process for producing disodium citrate. The finished disodium citrate is prepared by slowing adding citric acid into 22 to 25 percent solution of sodium hydroxide to perform neutralization reaction, concentrating after the reaction is finished, cooling, precipitating, crystallizing and drying. The production process has the advantages of simpleness, low labor intensity, recyclable mother liquor, no wastewater discharge, material saving, and obvious economic benefit and environmental benefit. The product can be used as an antioxidant, an antioxidant synergist, a buffering agent, an emulsifying salt and the like, and is mainly used in food, such as wine, sparkling wine and cheese sheets, and animal feeds and other industries.
Description
Technical field
The present invention relates to a kind of production technique of disodium citrate.
Background technology
Disodium citrate is as antioxidant, anti-oxidant synergistic agent, and buffer reagent, functions such as emulsification salt are mainly used in food: in grape wine, light sparkling wine and cheese straw, and industry such as animal-feed, there is a certain amount of demand the domestic and international market.Product is white or colourless crystallization powder.
All there is not the introduction of disodium citrate production technique at present existing patent or the disclosed data.
Summary of the invention
Goal of the invention: the objective of the invention is in order to solve the deficiency of still unexposed disodium citrate production technique in the prior art, providing a kind of is the processing method of raw material to produce citric acid disodium with sodium hydroxide and citric acid.
The technical solution used in the present invention: a kind of production technique of disodium citrate may further comprise the steps:
1, is in the sodium hydroxide solution of 22-25% in concentration, slowly adds citric acid and carry out neutralization reaction that the mass ratio of described sodium hydroxide and citric acid is 1: 2.39-2.41;
2, neutralization reaction fully after, it is 1.25-1.30 that feed liquid is concentrated into proportion, being cooled to feed temperature is 20-25 ℃, separates out to a large amount of disodium citrate crystallizations, removes the crystallization that mother liquor obtains disodium citrate through whizzer;
3, the disodium citrate crystallization was delivered to 60-65 ℃ of loft drier dry 90-100 minute, promptly made the finished lemon acid disodium.
Its reaction principle is: 2NaOH+C
6H
8O
7=Na
2C
6H
6O
7+ 2H
2O
As optimization, in above-mentioned steps 1, the mass ratio of described sodium hydroxide and citric acid is 1: 2.40.
In above-mentioned steps 2, the mother liquor that removes through whizzer can be recycled, and continues the crystallization by above-mentioned steps 2 concentrates, cooling, crystallization, centrifugal dewatering obtain disodium citrate.
This product appearance presents white powder.
Beneficial effect: the present invention is a raw material by adopting citric acid and sodium hydroxide, and neutralization reaction makes disodium citrate, obtains finished product by concentrated, cooling, crystallization, drying, and technology is simple, and labour intensity is little, and production cost is little, is fit to suitability for industrialized production; Recycling Mother Solution is used, and non-wastewater discharge has been saved raw material, economic benefit and obvious environment benefit.
Embodiment
The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
A kind of production technique of disodium citrate may further comprise the steps:
1, take by weighing and contain the solid-state or liquid sodium hydroxide of sodium hydroxide 80kg (in 100% pure content), adding water, to be mixed with concentration be 22% sodium hydroxide solution, slowly adds 191.2kg citric acid solid (in anhydrous), carries out neutralization reaction;
2, neutralization reaction concentrates after fully, to proportion be 1.25, being cooled to feed temperature is 20 ℃, extremely a large amount of disodium citrate crystallizations is separated out, remove the crystallization that mother liquor obtains disodium citrate through whizzer, Recycling Mother Solution is used, and continues the crystallization by this step concentrates, cooling, crystallization, centrifugal dewatering obtain disodium citrate;
3, the disodium citrate crystallization was delivered to 60 ℃ of loft drier dry 90 minutes, promptly made the finished lemon acid disodium.
Embodiment 2
A kind of production technique of disodium citrate may further comprise the steps:
1, take by weighing and contain the solid-state or liquid sodium hydroxide of sodium hydroxide 80kg (in 100% pure content), adding water, to be mixed with concentration be 23.5% sodium hydroxide solution, slowly adds 192.13kg citric acid solid (in anhydrous), carries out neutralization reaction;
2, neutralization reaction concentrates after fully, to proportion be 1.27, being cooled to feed temperature is 23 ℃, extremely a large amount of disodium citrate crystallizations is separated out, remove the crystallization that mother liquor obtains disodium citrate through whizzer, Recycling Mother Solution is used, and continues the crystallization by this step concentrates, cooling, crystallization, centrifugal dewatering obtain disodium citrate;
3, the disodium citrate crystallization was delivered to 63 ℃ of loft drier dry 95 minutes, promptly made the finished lemon acid disodium.
Embodiment 3
A kind of production technique of disodium citrate may further comprise the steps:
1, take by weighing and contain the solid-state or liquid sodium hydroxide of sodium hydroxide 80kg (in 100% pure content), adding water, to be mixed with concentration be 25% sodium hydroxide solution, slowly adds 192.8kg citric acid solid (in anhydrous), carries out neutralization reaction;
2, neutralization reaction concentrates after fully, to proportion be 1.30, being cooled to feed temperature is 25 ℃, extremely a large amount of disodium citrate crystallizations is separated out, remove the crystallization that mother liquor obtains disodium citrate through whizzer, Recycling Mother Solution is used, and continues the crystallization by this step concentrates, cooling, crystallization, centrifugal dewatering obtain disodium citrate;
3, the disodium citrate crystallization was delivered to 65 ℃ of loft drier dry 100 minutes, promptly made the finished lemon acid disodium.
Above-mentioned 3 embodiment all obtain product quality indicator and are:
Content C
6H
6Na
2O
71.5H
2O 〉=99.0-101.0%
Weight loss on drying (105 ℃, 3 hours)≤0.4%
Arsenic (in As)≤0.0002%
Heavy metal (in Pb)≤0.0010%
PH (3%H
2O solution) 4.9-5.2
Organic volatile≤0.4%
Claims (3)
1. the production technique of a disodium citrate is characterized in that: may further comprise the steps:
(1) is in the sodium hydroxide solution of 22-25% in concentration, slowly adds citric acid and carry out neutralization reaction that the mass ratio of described sodium hydroxide and citric acid is 1: 2.39-2.41;
(2) neutralization reaction fully after, it is 1.25-1.30 that feed liquid is concentrated into proportion, being cooled to feed temperature is 20-25 ℃, separates out to a large amount of disodium citrate crystallizations, removes the crystallization that mother liquor obtains disodium citrate through whizzer;
(3) the disodium citrate crystallization was delivered to 60-65 ℃ of loft drier dry 90-100 minute, promptly made the finished lemon acid disodium.
2. the production technique of disodium citrate according to claim 1, it is characterized in that: in above-mentioned steps (1), the mass ratio of described sodium hydroxide and citric acid is 1: 2.40.
3. the production technique of disodium citrate according to claim 1, it is characterized in that: in above-mentioned steps (2), the Recycling Mother Solution that will remove through whizzer is used, and continues the crystallization that, cooling concentrated by above-mentioned steps (2), crystallization, centrifugal dewatering obtain disodium citrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010221023 CN101863756B (en) | 2010-07-07 | 2010-07-07 | Process for producing disodium citrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010221023 CN101863756B (en) | 2010-07-07 | 2010-07-07 | Process for producing disodium citrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101863756A true CN101863756A (en) | 2010-10-20 |
| CN101863756B CN101863756B (en) | 2013-05-08 |
Family
ID=42955725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010221023 Active CN101863756B (en) | 2010-07-07 | 2010-07-07 | Process for producing disodium citrate |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104478704A (en) * | 2014-12-22 | 2015-04-01 | 南通市飞宇精细化学品有限公司 | Preparation method of anhydrous trisodium citrate |
| WO2018094754A1 (en) * | 2016-11-25 | 2018-05-31 | 南通市飞宇精细化学品有限公司 | Method for preparing selenium citrate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101407454A (en) * | 2007-10-13 | 2009-04-15 | 黄石兴华生化有限公司 | Process for preparing citrate salt from mother liquor for citric acid production |
| CN101607892A (en) * | 2009-08-07 | 2009-12-23 | 湖南尔康制药有限公司 | The production method of Sodium Citrate |
-
2010
- 2010-07-07 CN CN 201010221023 patent/CN101863756B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101407454A (en) * | 2007-10-13 | 2009-04-15 | 黄石兴华生化有限公司 | Process for preparing citrate salt from mother liquor for citric acid production |
| CN101607892A (en) * | 2009-08-07 | 2009-12-23 | 湖南尔康制药有限公司 | The production method of Sodium Citrate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104478704A (en) * | 2014-12-22 | 2015-04-01 | 南通市飞宇精细化学品有限公司 | Preparation method of anhydrous trisodium citrate |
| WO2018094754A1 (en) * | 2016-11-25 | 2018-05-31 | 南通市飞宇精细化学品有限公司 | Method for preparing selenium citrate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101863756B (en) | 2013-05-08 |
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Address after: 226000 Zhao Dianju, Ping Chao Town, Tongzhou District, Nantong, Jiangsu Patentee after: Nantong Feiyu Food Technology Co., Ltd. Address before: 226364 88 group nineteen, Dian Xi village, Ping Dong Town, Tongzhou District, Nantong, Jiangsu Patentee before: Nantong Feiyu Fine Chemical Co., Ltd. |