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Heavy metal ion complexing agent, preparation method and applications thereof

A technology of heavy metal ions and complexing agents, used in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Simple storage and use, low production cost, easy precipitation effect

Active Publication Date: 2013-08-28
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polymer complexing agent has a large molecular weight, good settling performance, and has a certain flocculation effect, but its functional group utilization rate is reduced, the treatment effect is poor, and the solubility of the polymer complexing agent in water decreases with the increase of the molecular weight; However, the functional group utilization rate of the small molecule complexing agent is high, but the precipitate flocs produced are small and the sedimentation performance is not good. It is necessary to add flocculants to make the flocs have a relatively ideal sedimentation performance; in addition, the complexation of heavy metal ions is currently restricted. An important factor for the wide application of complexing agents is the high production cost of complexing agents, which makes the processing costs high and the application is limited.

Method used

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  • Heavy metal ion complexing agent, preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The required production raw materials of the heavy metal ion complexing agent of preparation 1Kg: triethylenetetramine 100g, accounts for 10% of total amount; Sodium hydroxide 200g, accounts for 20% of total amount; Epichlorohydrin 50g, accounts for 5% of total amount ; CS 2 250g, accounting for 25% of the total amount; 400g of deionized water, accounting for 40% of the total amount.

[0050] In the preparation process, 200g sodium hydroxide is dissolved in 400g deionized water to obtain sodium hydroxide solution, and the aforementioned lye of 1 / 3 of the total volume is placed in a three-necked flask with a stirrer and a reflux condenser. Place in a water bath at 28°C and stir at a stirring speed of 800 rpm. At the same time, 100 g of triethylenetetramine was slowly added under stirring conditions, and then 50 g of epichlorohydrin was slowly added dropwise at a rate of 4% of the total mass per minute. After the chlorinated alkanes were added, the temperature was raise...

Embodiment 2

[0053] The required production raw materials of the heavy metal ion complexing agent of preparation 1Kg: ethylenediamine 40g, accounts for 4% of total amount; Potassium hydroxide 100g, accounts for 10% of total amount; Dichloroethane 20g, accounts for 2% of total amount; CS 2 80g, accounting for 8% of the total amount; 20g of methanol, accounting for 2% of the total amount; 740g of deionized water, accounting for 74% of the total amount.

[0054] In the preparation process, 100g of potassium hydroxide is dissolved in 740g of deionized water to obtain sodium hydroxide solution, and 1 / 4 of the total volume of lye is placed in a three-necked flask with a stirrer and a reflux condenser. Stir in a water bath at 20°C at a stirring speed of 500 rpm. At the same time, slowly add 40g of ethylenediamine under the condition of stirring, and then slowly dropwise add 20g of dichloroethane, and the dropping rate per minute is 2% of the total amount. After the chlorinated alkanes are added,...

Embodiment 3

[0057] The required production raw materials of the heavy metal ion complexing agent of preparation 1Kg: diethylenetriamine 80g, account for 8% of total amount; Sodium hydroxide 150g, account for 15% of total amount; Dichloropropane 40g, account for 4% of total amount; CS 2 100g, accounting for 10% of the total amount; 50g of ethanol, accounting for 5% of the total amount, and 560g of deionized water, accounting for 56% of the total amount. In the preparation process, 150g of sodium hydroxide is dissolved in 560g of deionized water to obtain sodium hydroxide solution, and 1 / 2 of the total volume of lye is placed in a three-necked flask with a stirrer and a reflux condenser. Stir in a water bath at 25°C at a stirring speed of 800 rpm. At the same time, slowly add 80g of diethylenetriamine under the condition of stirring, then slowly add 40g of dichloropropane dropwise, the rate of dropping per minute is 3% of the total amount, after the chlorinated alkanes are added, heat up t...

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Abstract

The invention discloses a heavy metal ion complexing agent, a preparation method and applications of the heavy metal ion complexing agent. The heavy metal ion complexing agent comprises the following components by weight: 4%-22% of polyamine, 10%-25% of alkali, 2%-10% of chloralkane, 28%-35% of CS2 (carbon disulfide) and 0-5% of alcohol. The heavy metal ion complexing agent can be prepared by conventional, simple and convenient operation, and can remove heavy metal ions in wastewater through the action of complexation, absorption, flocculation, precipitation and the like after being added into the wastewater, and the removal efficiency to heavy metal ion such as Pb, Cd, Ni, Hg and the like is more than or equal to 99%. According to the invention, the raw materials are wide in source, the preparation process is simple, the reaction condition is mild, the pollutant removal efficiency is high, new devices and new structures do not need to be arranged additionally in the practical application, the heavy metal ion complexing agent can be applied by only utilizing an existing preparing and adding system for water treatment agent, the application is simple, the application range is wide,the adaptability is strong, and the heavy metal ion complexing agent has the advantages of economy, high efficiency, safety, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water heavy metal pollution control, and in particular relates to a heavy metal ion complexing agent and a preparation method and application thereof. Background technique [0002] In 2010, the total discharge of industrial wastewater in the country reached 23.75 billion tons, of which the discharge of heavy metal wastewater exceeded 4 billion tons. The discharge of such a large amount of heavy metal wastewater has made the problem of heavy metal pollution in my country's water increasingly prominent. According to incomplete statistics, the heavy metal pollution rate in the bottom of rivers, lakes and reservoirs in my country is as high as 80.1%. Heavy metals mainly refer to Hg, Cd, Pb, Cr, As, Cu and Ni, etc., mainly from chemical industry, non-ferrous metal mining and smelting, battery manufacturing, electroplating, printing and dyeing, ceramics, plastics and other industrial production. Due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/54C02F1/62
Inventor 方平岑超平唐子君陈定盛梁阳明
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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