CN100522927C - Process for preparing EDTA disodium salt - Google Patents
Process for preparing EDTA disodium salt Download PDFInfo
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- CN100522927C CN100522927C CNB2006100221156A CN200610022115A CN100522927C CN 100522927 C CN100522927 C CN 100522927C CN B2006100221156 A CNB2006100221156 A CN B2006100221156A CN 200610022115 A CN200610022115 A CN 200610022115A CN 100522927 C CN100522927 C CN 100522927C
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- Prior art keywords
- edta
- quadrol
- hydroxyacetonitrile
- sodium hydroxide
- disodium salt
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Abstract
The present invention provides process of preparing EDTA disodium salt. The process includes the following steps: 1. mixing ethylene diamine and sodium hydroxide and heating, dropping hydroxyl acetonitrile within 5 hr, reaction after finishing dropping for at least 30 min until releasing ammonia completely; 2. adding EDTA to regulate pH value to 5-6; 3. adding active carbon into the reacted liquid to decolorize; 4. adding EDTA to regulate pH value to 3.5-4.5; and 5. concentrating the reacted liquid to crystallize, separating and drying to obtain EDTA disodium salt product. The present invention has low production cost and high product quality.
Description
Technical field:
The present invention is relevant with the preparation method of disodium EDTA (EDTA disodium salt).
Background technology:
The method of the existing EDTA of preparation disodium salt is mainly ethylenediamine tetraacetic acid (EDTA) (EDTA) method.
This method is earlier by behind the synthetic EDTA of sodium cyanide method, prussic acid method, chloroactic acid method and hydroxyacetonitrile method, again EDTA is dissolved in and generates the EDTA tetra-na salt in the alkaline solution, add EDTA then and transfer reaction solution pH=5～6, in reaction solution, add after the decolorizing with activated carbon, adding EDTA conditioned reaction liquid pH value again is 3.5～4.5, at last reaction solution is concentrated, crystallization, separation, dry EDTA disodium salt product.
This method is synthesized the EDTA disodium salt through the EDTA tetra-na salt, so there is the higher shortcoming of production cost again owing to will synthesize EDTA earlier.
Summary of the invention:
To the objective of the invention is in order overcoming, to provide that a kind of production cost is low, the preparation method of the disodium ethylene diamine tetraacetate of good product quality with deficiency.
The object of the present invention is achieved like this:
The preparation method of disodium EDTA of the present invention comprises the steps:
1) quadrol and sodium hydroxide are mixed, heat up, drip hydroxyacetonitrile in 5 hours, dropwise back insulation reaction at least 30 minutes and discharge until ammonia and finish, add hydrogen peroxide;
2) adding ethylenediamine tetraacetic acid (EDTA) conditioned reaction liquid pH value is 5～6;
3) in reaction solution, add decolorizing with activated carbon;
4) reaction solution after will decolouring adds ethylenediamine tetraacetic acid (EDTA) to regulate the pH value is 3.5～4.5;
5) reaction solution is concentrated, crystallization, separation, dry disodium EDTA product, be raw material with quadrol, sodium hydroxide and hydroxyacetonitrile, can reduce production costs greatly.
Above-mentioned quadrol and hydroxyacetonitrile mol ratio are quadrol: hydroxyacetonitrile=1:3.8～5.2, and quadrol and sodium hydroxide mol ratio are quadrol: sodium hydroxide=1:4～6.0
Temperature of reaction during above-mentioned dropping hydroxyacetonitrile is 60～130 ℃.
Chemical equation involved in the present invention is as follows:
Present method production cost is low, good product quality.
Embodiment:
Embodiment 1:
In 250ml three flasks that have thermometer, prolong, agitator be that 99.4% quadrol 15.1g, quality percentage composition are that 30% sodium hydroxide 173.3g mixes with the quality percentage composition, heat up, in 5 hours, drip the quality percentage composition in the time of 85 ℃ and be 35% hydroxyacetonitrile 163g, be warming up to 110 ℃ of reactions 30 minutes after dripping off, add 130g water and 0.2g hydrogen peroxide.Adding 75gEDTA conditioned reaction liquid pH value is 5～6.In reaction solution, add decolorizing with activated carbon, it is 3.5～4.5 that reaction solution after the decolouring is added 42gEDTA adjusting pH value, with reaction solution concentrate, the white crystals product 147.5g of crystallization, separation, dry EDTA disodium salt, content 99.3%, yield 60.5% (in sodium hydroxide).Mother liquor behind the separation EDTA disodium salt can carry out acidifying with sulfuric acid, makes EDTA, is used as adjust pH.
Embodiment 2:
By embodiment 1 operation that feeds intake, different is that the hydroxyacetonitrile charging capacity in the example 1 is become 187.5g, obtains the white crystals product 151g of EDTA disodium salt at last, content 99.4%, yield 62% (in sodium hydroxide).
Embodiment 3:
By embodiment 1 operation that feeds intake, different is to begin to drip hydroxyacetonitrile in the time of 85 ℃, slowly heats up simultaneously, after dripping off in 5 hours, temperature rises to 110 ℃, obtains the white crystals product 152.3g of EDTA disodium salt at last, content 99.5%, yield 62.6% (in sodium hydroxide).
The various embodiments described above are that content of the present invention is further described, but this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to the foregoing description.All technology that realizes based on foregoing all belong to protection scope of the present invention.
Claims (3)
1, the preparation method of disodium EDTA comprises the steps:
1) quadrol and sodium hydroxide are mixed, heat up, drip hydroxyacetonitrile in 5 hours, dropwise back insulation reaction at least 30 minutes and discharge until ammonia and finish, add hydrogen peroxide;
2) adding ethylenediamine tetraacetic acid (EDTA) conditioned reaction liquid pH value is 5～6;
3) in reaction solution, add decolorizing with activated carbon;
4) reaction solution after will decolouring adds ethylenediamine tetraacetic acid (EDTA) to regulate the pH value is 3.5～4.5;
5) reaction solution is concentrated, crystallization, separation, dry disodium EDTA product.
2, the preparation method of disodium EDTA as claimed in claim 1, it is characterized in that quadrol and hydroxyacetonitrile mol ratio are quadrol: hydroxyacetonitrile=1:3.8～5.2, quadrol and sodium hydroxide mol ratio are quadrol: sodium hydroxide=1:4～6.0
3, the preparation method of disodium EDTA as claimed in claim 1 or 2, the temperature of reaction when it is characterized in that dripping hydroxyacetonitrile are 60～130 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100221156A CN100522927C (en) | 2006-10-25 | 2006-10-25 | Process for preparing EDTA disodium salt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100221156A CN100522927C (en) | 2006-10-25 | 2006-10-25 | Process for preparing EDTA disodium salt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1944397A CN1944397A (en) | 2007-04-11 |
| CN100522927C true CN100522927C (en) | 2009-08-05 |
Family
ID=38044076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100221156A Expired - Fee Related CN100522927C (en) | 2006-10-25 | 2006-10-25 | Process for preparing EDTA disodium salt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100522927C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101723842B (en) * | 2009-11-06 | 2012-11-07 | 重庆紫光鼎福化工有限责任公司 | Method for preparing ethylene diamine tetraacetic acid (EDTA) disodium salt |
| CN103159637B (en) * | 2013-03-25 | 2015-09-09 | 国药集团化学试剂有限公司 | A kind of method promoting industrial disodium ethylene diamine tetraacetate quality |
| CN106045867A (en) * | 2016-05-26 | 2016-10-26 | 河北诚信有限责任公司 | Process for synthesizing ethylenediamine-N-N'-disodium oxalic acid |
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2006
- 2006-10-25 CN CNB2006100221156A patent/CN100522927C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1944397A (en) | 2007-04-11 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090805 Termination date: 20141025 |
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| EXPY | Termination of patent right or utility model |