Sodium Edetate CAS 64-02-8
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- Appearance: White powder
- Assay: 99. 0%min
- Stock: In stock
- Sample: Available
- Zhishang Chemical: Sodium Edetate Supplement
Sodium Edetate: The Complete Guide
Sodium Edetate for Sale
Basic Info of Sodium Edetate
Ethylene diamine tetraacetic acid tetrasodium; Ethylenediaminetetraacetic acid, tetrasodium salt tetrahydrate; Tetrasodium EDTA
Food additives; Feed Additives; Inorganic Salts; Pharmaceutical raw materials; Organic raw materials
What is Sodium Edetate?
Ethylenediaminetetraacetic acid (EDTA) contains 4 carboxyl groups and can generally form di-salts, tri-salts and tetra-salts. Common EDTA salts are disodium EDTA (EDTA-2Na), tetrasodium EDTA-4Na, dipotassium EDTA-2K (EDTA-2K), and EDTA-3 Potassium (EDTA-3K). Tetrasodium ethylenediaminetetraacetate (EDTA-4Na) is a multifunctional organic small molecule containing amino and carboxyl groups, which is widely used in analytical chemistry as a complexing agent. It is widely available and inexpensive.
Tetrasodium EDTA has stable properties and is easily soluble in water. It is mainly used as stabilizer for cosmetics, chelating agent for pharmaceuticals, water softener, synthetic rubber catalyst, acrylic fiber polymerization terminator, printing and dyeing auxiliaries and washing auxiliaries. On top of that, EDTA-4Na can properly catalyze a collection of fragrant aldehydes, malononitriles and naphthols in a three-component one-pot response to create the matching chromene by-products. Its derivatives have antiviral, antitumor and other biological and also pharmacological tasks. It is widely used in your home and abroad. The application of EDTA-4Na in everyday chemical, electroplating, medication and various other fields has higher needs for its top quality.
Sodium Edetate Uses
- Tetrasodium EDTA is an important complexing representative as well as steel masking agent. It can be made use of for dyeing in fabric industry, water top quality treatment, color sensitization, medication, day-to-day chemical industry, papermaking as well as other markets, as additive, activator, water cleanser, metal ion covering up agent and also activator in styrene-butadiene rubber industry.
- In the dry-process acrylic sector, it can offset metal interference, enhance the color as well as brightness of dyed materials, and can also be utilized in liquid detergents to enhance cleaning high quality and also boost cleaning impact.
- Sodium edetate is utilized as ammonia carboxyl complexing agent, artificial rubber catalyst, and additionally used as water softener in fiber refining, whitening and also dyeing sectors.
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Preparation of Sodium Edetate
At present, the production of high-quality EDTA-4Na basically adopts the acidification of the reaction solution to obtain ethylenediaminetetraacetic acid (EDTA), and EDTA is then reacted with liquid alkali to obtain EDTA-4Na. This process requires a large amount of acid and alkali, and produces a large amount of High-salt waste water consumes a lot of energy and has an impact on the environment. Therefore, a high-quality EDTA-4Na production process with low material consumption and low energy consumption was studied.
Choice of process route
At present, the production processes of EDTA series products mainly include chloroacetic acid method, sodium cyanide method and hydrocyanic acid method, etc. None of these methods can directly meet the high quality requirements of EDTA-4Na and need further processing. If high-quality EDTA-4Na can be obtained directly from the EDTA-4Na in the reaction solution, it is of great significance in terms of resource and energy utilization. After analysis, it is believed that the solubility of EDTA-4Na is relatively large, and high-quality EDTA-4Na can be obtained directly from the reaction solution through two crystallizations. The amount of water used to treat the mother liquor is basically the same.
In the two crystallization purification processes, 2800kg of water needs to be concentrated per ton of product. The amount of concentrated water is large, and an efficient and energy-saving dehydration method is required. MVR is the abbreviation of mechanical vapor recompression technology (mechanical vapor recompression), which uses the secondary steam and its energy generated by the evaporation system itself to upgrade the low-grade steam into a high-grade steam heat source through the mechanical work of the compressor. Reducing the consumption of steam and cooling water in the concentration process has the characteristics of high efficiency, energy saving and low consumption, and the concentration cost is only 20% of the traditional triple-effect steaming.
Results and Discussion
The influence on high-quality EDTA-4Na is mainly manifested in impurities. The main factors affecting the precipitation of impurities are the solid-to-liquid ratio of the concentrated crystallization and the withdrawal amount of the mother liquor after concentration. Therefore, the solid-to-liquid ratio of EDTA-4Na and the withdrawal of the EDTA-4Na mother liquor of the primary and secondary concentrated crystallization were studied.
In addition to EDTA-4Na, there are other impurities such as aminotriacetic acid, sodium formate and sodium glycolate in the reaction solution. These impurities have adverse effects on the crystallization and quality of EDTA-4Na, so it is necessary to control the crystal form and quality of the primary crystallization. The impurity content of EDTA-4Na is represented by the content of aminotriacetic acid in the crystal. It can be seen that when the solid-liquid ratio of the primary crystallization concentration is 50%, the morphology of the crystallization system is more suitable and easy to be centrifuged, so the solid-liquid ratio of the primary crystallization is determined to be 50%.
The amount of mother liquor withdrawn for primary crystallization directly affects the quality of primary crystallization. The lower the quality of the primary crystallization, the more unfavorable the influence on the secondary crystallization. If the withdrawal amount of the mother liquor of the primary crystallization is too large, the yield of the primary crystallization is too low, which also has a great influence on the value of the whole process. Under the concentration condition of the solid-liquid ratio of 50%, the content of aminotriacetic acid, the main impurity in the primary crystallization, was compared with the withdrawal amount of the mother liquor. The content of acetic acid is 0.2% to 0.3%, and the withdrawal amount of the mother liquor is increased again, and the content of aminotriacetic acid in the crystallization does not change much, so the withdrawal amount of the mother liquor for the first crystallization is determined to be 30%.
The process parameters for obtaining high-quality EDTA-4Na from the EDTA-4Na reaction solution through two crystallization methods were determined and verified in actual production. Using MVR technology to concentrate the crystallization, the solid-liquid ratio of the primary crystallization is controlled at 50%, and the amount of the primary mother liquor is 30%; the solid-liquid ratio of the secondary crystallization is controlled at 70%, the secondary mother liquor is 20%. The mother liquor enters the primary crystallization system, and under this production condition, high-quality EDTA-4Na that meets the requirements can be obtained. This method not only avoids the consumption of acid and alkali in the production process, but also uses MVR technology to reduce the energy consumption to 20% of the original, realizes the comprehensive utilization of resources and energy, and avoids the generation of EDTA-4Na by EDTA method. The batch process realizes the continuous and improves the automation level.