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Preparation method of novel environment-friendly chelating agent

A chelating agent and green technology, which is applied in the field of preparation of new green chelating agents, can solve the problems of low performance of IDS chelating metal, restricted wide use, and is not easy to biodegrade, and achieves the effects of novel structure, low price and simple production equipment.

Pending Publication Date: 2021-03-02
HEFEI ALL PLUS ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, EDTA is not easy to biodegrade (OECD), NTA has potential carcinogenicity, IDS has low performance in chelating metals, raw material toxicity is high in the production process of GLDA and MGDA, equipment requirements are high, industrialization is difficult, production costs are high, and product prices are high. Expensive, often limiting its widespread use in real life

Method used

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  • Preparation method of novel environment-friendly chelating agent
  • Preparation method of novel environment-friendly chelating agent
  • Preparation method of novel environment-friendly chelating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 196g of maleic anhydride to a 2000mL four-neck bottle, then add 200g of deionized water, and hydrolyze at 25°C for 1h. Then use 50% (mass fraction) NaOH solution to adjust the pH value of the reaction system to 6.0-6.5, and keep the temperature not exceeding 45°C. After the dropwise addition, the temperature was raised to 55° C. and stirred for 15 minutes. Add 14g of sodium tungstate to the reaction system and stir for 45min. Add 30% hydrogen peroxide solution dropwise within 90 minutes, and add 50% NaOH to the system to adjust the pH. During the reaction, the pH is 6.0-7.5, and the temperature does not exceed 75°C. After adding hydrogen peroxide dropwise, raise the temperature to 65°C, stir for 3 hours, then add 120g of ethylenediamine, react for 5h, add sodium chloroacetate solution prepared by adding 190g of chloroacetic acid and 270g of 80g of solid sodium hydroxide water, and then raise the temperature to 60°C. After reacting for 5 hours, the temperature was...

Embodiment 2

[0022] Add 232g of maleic acid to a 2000mL four-neck flask, then add 200g of deionized water, and stir at 45°C for 1h. Then use 50% (mass fraction) NaOH solution to adjust the pH value of the reaction system to 5.0-6.5, and keep the temperature not exceeding 55°C. After the dropwise addition, the temperature was raised to 55° C. and stirred for 15 minutes. Add 16g of sodium tungstate to the reaction system and stir for 45min. Add 30% hydrogen peroxide solution dropwise within 90 minutes, and add 50% NaOH to the system to adjust the pH. During the reaction, the pH is 6.0-7.0, and the temperature does not exceed 75°C. Raise the temperature to 65°C, stir for 3 hours, then add 120g of ethylenediamine, react for 5h, add sodium chloroacetate solution prepared by adding 190g of chloroacetic acid and 270g of solid sodium hydroxide water 80g, then raise the temperature to 60°C, react for 5h, cool down to obtain N , N-diethylcarboxylate ethylenediamino-3-hydroxysuccinic acid tetrasod...

Embodiment 3

[0024] Add 232g of fumaric acid to a 2000mL four-neck flask, then add 200g of deionized water, and stir at 45°C for 1h. Then use 50% (mass fraction) NaOH solution to adjust the pH value of the reaction system to 5.0-6.5, and keep the temperature not exceeding 55°C. After the dropwise addition, the temperature was raised to 55° C. and stirred for 15 minutes. Add 20g of sodium tungstate to the reaction system and stir for 45min. Add 30% hydrogen peroxide solution dropwise within 90 minutes, and add 50% NaOH to the system to adjust the pH. During the reaction, the pH is 6.0-7.0, and the temperature does not exceed 75°C. After adding hydrogen peroxide dropwise, raise the temperature to 65°C, stir for 3h, then add 120g of ethylenediamine, react for 8h, add 190g of chloroacetic acid and 270g of solid sodium hydroxide water, 80g of sodium chloroacetate solution, then heat up to 60°C, After reacting for 15 hours, the temperature was lowered to obtain a solution of tetrasodium salt ...

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Abstract

The invention discloses a preparation method of a novel green chelating agent. The preparation method comprises the following steps: (1) hydrolyzing one or a mixture of more of maleic anhydride, maleic acid and fumaric acid at a temperature of 0-75 DEG C to prepare one or a solution of more of water, methanol, ethanol and isopropanol with a solid content of 40-60%; (2) preparing a solution with aconcentration of 30-50% from LiOH, NaOH and KOH, and dropwise adding the prepared solution into the solution at a constant speed; (3) dropwise adding the prepared maleic anhydride hydrolysis sample ata temperature of -40-85 DEG C, and stirring for a period of time after dropwise adding is completed; and (4) feeding one or more of prepared sodium tungstate, sodium molybdate and ammonium vanadate into the reaction solution according to 0.1-20% of the mass fraction of maleic anhydride, and then stirring for a period of time. The novel environment-friendly chelating agent is non-toxic and non-phosphorus, has strong chelating ability, is biodegradable, and can replace traditional chelating agents which are difficult to biodegrade or high in cost, such as EDTA, DPTA, NTA and the like, and HAB is novel in structure, wide in raw material source, low in price and simple in production equipment.

Description

technical field [0001] The invention relates to the technical field of compound preparation, in particular to a preparation method of a novel green chelating agent. Background technique [0002] At present, the common chelating agents mainly include phosphates, hydroxycarboxylic acids, aminocarboxylic acids and polymers containing carboxylic acids. The chelation effect of phosphate is better, but the phosphorus content causes great pollution to the environment. Sodium tripolyphosphate (STPP) is mainly used more, but the market gradually fades in the global calls for phosphorus restriction and phosphorus prohibition. Hydroxycarboxylic acids mainly include sodium gluconate, sodium citrate, etc. Generally, the chelating performance of metal ions is poor, and the cost performance is not high. Acrylic polymers belong to high molecular chelating agents. In addition to their chelating ability, they also have thickening and flocculation effects. Generally, after chelating, they wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/12C11D3/33C11D7/32
CPCC07C227/12C07C227/08C07D303/48C07D301/12C07C51/087C07C51/412C11D3/33C11D7/3245C07C229/24C07C57/15C07C57/145
Inventor 欧敏
Owner HEFEI ALL PLUS ENVIRONMENTAL TECH CO LTD