Method of preparing sea crystal from byproduct salt of refining iminodiacetic acid

A technology of iminodiacetic acid and by-product salt, which is applied in the fields of alkali metal sulfite/sulfite, chemical instruments and methods, water/sewage treatment, etc., and can solve the problem of affecting the quality of fishery seedlings or cultivation, and the quality of products , environmental pollution and other issues, to achieve the effect of inhibiting the growth of water clouds and weeds, protecting the environment and being convenient to use

Inactive Publication Date: 2007-10-17
捷马化工股份有限公司
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Problems solved by technology

Chinese patent 03138874.4 (the production method of solid seawater) discloses a production method of using bittern to produce solid seawater, which can greatly reduce production costs, recycle resources, and protect the coastal social and ecological environment, but this method requires concentration , high energy consumption, and contains a small amount of calcium sulfate, which affects the quality of fishery breeding or growing
No matter which method is used, a large amount of salt is produced in the production process of iminodiacetic acid. If the salt is brought into the product, it will affect the quality of the product, and if it is brought into the waste water, it will cause environmental pollution.

Method used

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  • Method of preparing sea crystal from byproduct salt of refining iminodiacetic acid
  • Method of preparing sea crystal from byproduct salt of refining iminodiacetic acid

Examples

Experimental program
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Embodiment 1

[0034] Embodiment 1: put into 1500kg of iminodiacetic acid sub-salts of the suction filter barrel, drain the mother liquor, add 300kg of water, soak for 30 minutes, and drain; add water 300kg, soak for 30 minutes and drain; the drained salt is dissolved in water, and the solution Continuously pass through a precision filter with a pore size of 20 μm, a multimedia filter with activated carbon, a microporous filter with a pore size of 0.1 μm, an adsorption tower equipped with CR20 polyamide chelating resin, a A precision filter with a pore size of 20 μm is used to remove solid impurities, viscous substances, macromolecular organic matter, heavy metal ions, and damaged resin; the refined solution is concentrated and crystallized, and the mother liquor A and salt obtained are separated, and the obtained salt is passed through Centrifuge, send into airflow dryer, control temperature 100 ℃ and dry continuously, obtain salt content and reach 99%, heavy metal ion content 0.5ppm. Take ...

Embodiment 2

[0035] Embodiment 2: put into 1500kg of iminodiacetic acid sub-salts in the suction filter tank, drain the mother liquor, add 300kg of water, soak for 30 minutes, and drain; add water 300kg, soak for 30 minutes and drain; the drained salt is dissolved in water, add The mother liquor A is mixed evenly, and the mixed solution passes continuously through a precision filter with a pore size of 50 μm, a multimedia filter with activated carbon, a microporous filter membrane with a pore size of 10 μm, and a chelating filter equipped with CR20 polyamide type Resin adsorption tower, a precision filter with a pore size of 50 μm to remove solid impurities, viscous substances, macromolecular organic matter, heavy metal ions and damaged resin; the refined solution is concentrated and crystallized, and the obtained mother liquor B and salt are separated , the obtained salt is centrifuged, placed in a hot air circulation oven, and dried at a controlled temperature of 105°C for 3 hours, the co...

Embodiment 3

[0037] Put 1500kg of iminodiacetic acid sub-salt into the suction filter tank, drain the mother liquor, add 300kg of water, soak for 30 minutes, and drain; add 300kg of water, soak for 30 minutes and drain; the drained salt is dissolved in water, add mother liquor B and mix well , the mixed solution continuously passes through a precision filter with a pore size of 30 μm, a multimedia filter with activated carbon, a microporous filter membrane with a pore size of 1 μm, and an adsorption tower equipped with CR20 polyamide chelating resin 1. A precision filter with a pore size of 25 μm to remove solid impurities, viscous substances, macromolecular organics, heavy metal ions and damaged resins; the refined solution is concentrated and crystallized, and the separated mother liquor set C can continue the refining process The obtained salt is centrifuged and sent to an airflow dryer, and the temperature is controlled at 130°C for continuous drying to obtain a salt content of 99% and ...

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Abstract

The invention relates to a method for preparing seawater crystal with refined iminodiacetic acid by-product salt and the steps are as follows in order: washing the by-product salt, solving, fine filtering, filtering with various medium, micro-filtering, chelating, secondary fine filtering, recrystallizing, centrifugating and drying, then adding a proportion of MgSO4, MgCl2, CaCl2, KCl and NaS2O3 into the salt to prepare seawater crystal and the proportion is: NaCl 72.3-77.5%, MgSO4 7.5-12%, MgCl2 11.6-13.5%, CaCl2 1.65-1.94%, KCl 1.35-1.64% and NaS2O3 0.001-0.002%, with the total percentage of 100%. The invention uses a method for preparing seawater crystal with refined iminodiacetic acid by-product salt, which is characterized in using by-product NaCl, reducing raw materials cost and protecting the environment, which is a typical clean production process.

Description

technical field [0001] The invention relates to a method for producing solid seawater, in particular to a method for preparing sea crystals from refined iminodiacetic acid by-product salt. Background technique [0002] Sea crystal is a salt composition, as long as it is mixed with an appropriate amount of water, it becomes artificial seawater, which can be used for the cultivation of seafood in inland areas and overcome the difficulties in seawater transportation. It is the product of seawater and salt chemical industry. It is mainly produced through a series of processes such as evaporation, centrifugation, and concentration of seawater or brine. It basically retains the main components of seawater and is concentrated seawater. Adding trace elements selectively can not only supplement some elements and compounds lost in the production process, but also make the whole product more practical. For example, adding selenium and molybdenum can not only promote the growth of aquat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D5/00C01F5/30C02F1/00C02F1/28C02F1/42C02F1/44
Inventor 王文周良郑端镛徐国明王中石刘小华邱晖
Owner 捷马化工股份有限公司
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