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Method for preparing heavy metal chelating agent with waste oil or animal and vegetable oil

A heavy metal chelating agent, animal and vegetable oil technology, applied in the field of environmental chemistry and green chemistry, can solve the problems of slow effect, long cycle, high cost, etc.

Inactive Publication Date: 2017-11-03
SHENZHEN DAWU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some soil remediation technologies are immature, and there are always disadvantages such as long cycle, slow effect, high cost, etc.

Method used

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  • Method for preparing heavy metal chelating agent with waste oil or animal and vegetable oil
  • Method for preparing heavy metal chelating agent with waste oil or animal and vegetable oil
  • Method for preparing heavy metal chelating agent with waste oil or animal and vegetable oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Synthesis of Fatty Acid Mixtures

[0017] Sunflower oil recovered from leftovers (attached figure 1 , structural formula 1, 20 g, about 24 mmol) and sodium hydroxide aqueous solution (15g / 100 mL, 375 mmol) were heated to 70 o C, stirred overnight. Acidify with 6N hydrochloric acid to pH about 2, and extract twice with ethyl acetate (2×40 mL). The combined organic phases were filtered and dried with a magnesium sulfate filter cake, and the fatty acid mixture 2 (19.1 g, about 100% yield) was obtained after vacuum distillation (recovering the organic solvent);

[0018] Appearance: bright yellow oily liquid; R f = 0.38 (20% ethyl acetate / n-hexane); 1 H-NMR (400MHz, CDCl 3 ) δ 11.03 (s, 1H), 5.41-5.30 (m, 2H), 2.29 (t, J = 7.3 Hz, 2H),2.07-1.99 (m, 3H), 1.63-1.56 (m, 2H), 1.42-1.16 (m, 19H), 0.90-0.86 (m, 3H)ppm; 13 C-NMR (100 MHz, CDCl 3 ) δ 180.5, 130.3, 130.1, 129.8, 128.1, 34.8, 32.0,31.6, 29.9, 29.8, 29.7, 29.5, 29.4, 29.3, 27.3, 25.7, 25.0, 22.8, ...

Embodiment 2

[0019] Embodiment 2: the synthesis of aliphatic chain acid halide mixture

[0020] Add oxalyl chloride (2 mL) to fatty acid mixture 2 (2 g, about 7 mmol) in dichloromethane (6 mL) while stirring, stir overnight at room temperature, distill under reduced pressure to remove oxalyl chloride to obtain fat Alkyl acid chloride mixture 3.

Embodiment 3

[0021] Embodiment 3: the synthesis of iminodiacetic acid diester

[0022] at 0 o Slowly add thionyl chloride to the ethanol under stirring, rise to room temperature and continue stirring for about half an hour. Then iminodiacetic acid (formula 4, 3.33 g, 25 mmol) was added, and the temperature was raised to reflux overnight. After cooling to room temperature, the reaction was quenched with saturated sodium bicarbonate solution (20 mL), and then solid sodium bicarbonate was added to adjust the pH to neutral. After most of the ethanol was recovered by distillation under reduced pressure, ethyl acetate was added to extract three times (3×20 mL). The organic phases were combined, washed once with saturated brine, filtered and dried with magnesium sulfate filter cake, and diethyl iminodiacetate was obtained after vacuum distillation (recovering the organic solvent) (Formula 5, 4.15 g, yield 88%) ;

[0023] Characterization: colorless liquid; R f = 0.56 (8% methanol / dichlorom...

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Abstract

The invention relates to a method for preparation of a heavy metal chelating agent containing an aliphatic chain group. The method comprises the steps of: conducting basic hydrolysis on grease to obtain a fatty acid mixture; preparing acyl halide; carrying out condensation with iminodiacetic acid diester; and selectively hydrolyzing the ester group to obtain the aliphatic chain group containing heavy metal chelating agent mixture. The total yield of all the steps can reach 80%. chelating ability qualitative experiment shows that the chelating agent containing C16-C20 aliphatic chain group amide diacetic acid prepared according to the method provided by the invention has strong chelating performance on heavy metal salts Cd (NO3)2.4H2O, HgCl2, MnCl2.4H2O, CoCl2.6H2O, and NiCl2.6H2O, but has weak chelating performance on Pb(OAc)2 and CrCl3. The chelating agent prepared by the method can be used for ''extracting'' heavy metal ions from soil. In addition, the chelating agent can be a mixture, and can be prepared from gutter oil. Therefore, through promotion, the technology can turn waste into treasure, and reduce the pressure of kitchen waste on the environment.

Description

technical field [0001] The invention belongs to the technical fields of environmental chemistry and green chemistry and chemical industry, and in particular relates to a method for preparing a fatty chain-based heavy metal chelating agent from waste oil or animal and vegetable oil. Background technique [0002] The soil environment in China is deteriorating. The recent cadmium rice incident has brought people's attention to soil heavy metal pollution. Statistics show that the area of ​​cultivated land polluted by heavy metals in my country has reached 20 million hectares, accounting for 1 / 6 of the total cultivated land area in the country. The situation is already very serious. At present, some soil remediation technologies are immature, and there are always disadvantages such as long cycle, slow effect, high cost and so on. Therefore, it is of great significance to develop a low-cost and highly operable heavy metal chelating agent and related technologies to solve this pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C231/12C07C233/47C09K17/14
CPCC07C51/09C07C51/60C07C227/18C07C231/02C07C231/12C09K17/14C07C233/47C07C229/16C07C53/42C07C53/126
Inventor 李保健周斌华汪子玉邵明非
Owner SHENZHEN DAWU TECH CO LTD
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