Method for recovering dimethylamine from sucralose production wastewater

A technology for the production of sucralose and wastewater, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of excessive ammonia nitrogen in wastewater discharge, and achieve low energy consumption, low investment, and good economic applicability Effect

Active Publication Date: 2015-09-16
JK SUCRALOSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most manufacturers choose to directly carry out biochemical treatment of wastewater, causing serious problems such as ammonia nitrogen discharge in wastewater exceeding the standard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0025] The wastewater from the sucralose production tank area is 4500Kg, and its ammonia nitrogen value is 25210 (N, mg / L), wherein the content of dimethylamine hydrochloride is about 12.1%, and the content of DMF is about 2.4%. It is transported into the enamel reaction kettle, Add 297Kg CaO powder to the reaction kettle while stirring, and the addition amount is about 6.6% of the waste water amount.

[0026] In other embodiments, other strong basic oxides can also be used to react with dimethylamine hydrochloride and DMF in the waste water, and calcium oxide is a better solution in this embodiment, which involves Chen Ben and the convenience factor of inorganic salt recovery.

[0027] After adding CaO powder, the temperature of the reaction mass was raised to 95°C and kept for 4h. The dimethylamine gas and water vapor from the upper part of the reaction kettle first enter the condenser for cooling, and the cooled dimethylamine aqueous solution enters the dimethylamine crude...

no. 2 Embodiment

[0031] The waste water from the tank area is 4500Kg, the ammonia nitrogen value is 31255 (N, mg / L), the content of dimethylamine hydrochloride is about 15.2%, and the content of DMF is about 3.0%. 373Kg CaO powder, the addition amount is about 8.3% of the waste water amount.

[0032] After adding CaO powder, the temperature of the reaction mass was raised to 100°C and kept for 3.5h. The dimethylamine gas and water vapor from the upper part of the reaction kettle first enter the condenser for cooling, and the cooled dimethylamine aqueous solution enters the dimethylamine crude product tank for storage, and the content of dimethylamine in the crude product tank is about 22%.

[0033] The ammonia nitrogen value of the residual liquid in the reaction kettle is 41 (N, mg / L). The residual liquid is filtered through a bag filter, and the filter residue is air-dried and then incinerated. The filtrate has a low ammonia nitrogen content and can be directly entered into the sewage treatm...

no. 3 Embodiment

[0036] The waste water from the tank area is 4500Kg, the ammonia nitrogen value is 38950 (N, mg / L), the content of dimethylamine hydrochloride is about 17.4%, and the content of DMF is about 5.0%. 462Kg CaO powder, the addition amount is about 10.3% of the waste water amount.

[0037] After adding CaO powder, the temperature of the reaction mass was raised to 105°C and kept for 3h. The dimethylamine gas and water vapor from the upper part of the reactor first enter the condenser for cooling, and the cooled dimethylamine aqueous solution enters the dimethylamine crude product tank for storage, and the content of dimethylamine in the crude product tank is about 20%.

[0038] The ammonia nitrogen value of the residual liquid in the reaction kettle is 38 (N, mg / L). The residual liquid is filtered through a bag filter, and the filter residue is air-dried and incinerated. The filtrate has a low ammonia nitrogen content and can be directly entered into the sewage treatment system for...

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Abstract

The invention aims at providing a treatment scheme of ammonia nitrogen in sucralose production wastewater, and discloses a method for recovering dimethylamine from sucralose production wastewater. The method comprises the following steps: a highly alkaline material is added into wastewater containing 10-30% of dimethylamine hydrochloride and 1-5% of N,N-dimethylformamide, such that an intermediate product with a dimethylamine concentration of 10-30% is obtained; the intermediate product is subjected to rectification purification, such that a dimethylamine solution with a concentration higher than 35% is obtained. The technical scheme provided by the invention has the advantages of low energy consumption, low investment, and reasonable economic benefit. While ammonia nitrogen wastewater is treated, dimethylamine is recovered. The method has high practicality and good economic applicability for enterprises.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment, in particular to a method for recovering dimethylamine from sucralose production wastewater. Background technique [0002] Dimethylamine exists as a gas at room temperature and has an ammonia-like odor. Its relative density is 0.680 (0°C), its melting point is -96°C, and its boiling point is 7.4°C. Soluble in water, soluble in ethanol and ether. It is flammable, weakly alkaline, and forms water-soluble salts with inorganic acids. It is used as raw material for pharmaceuticals, dyes, pesticides and rubber vulcanization accelerators. [0003] Sucralose (TGS), the only functional sweetener made from sucrose, is 600 times sweeter than sucrose. This sweetener has the characteristics of no energy, high sweetness, pure sweetness, and high safety. It is one of the best functional sweeteners at present and has been approved for use by more than 120 countries, and is used in more than 3,00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/04C07C209/86C07C209/84C02F1/04C02F1/58C02F103/36C02F101/38
Inventor 郑辉东吴金山陈允龙李根斌朱国廷
Owner JK SUCRALOSE
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