Desalting method of amino acid chelating agent

Abstract

A desalting method of an amino acid chelating agent comprises the following steps: step 1, diluting a reacted amino acid chelating agent mother solution with pure water into an aqueous solution with the chelating agent content of 20-30%; 2, transferring the aqueous solution obtained in the step 1 into an ultrafiltration membrane assembly to serve as ultrafiltrate, taking flowing pure water as a filtered water acceptor, pumping the pure water into the ultrafiltration membrane assembly from an inlet by using a pressure pump, and keeping the pressure in the ultrafiltration membrane assembly; 3, after the ultrafiltration membrane runs for 6-12 h, detecting the content of chloride ions in the solution in the ultrafiltration membrane set, after the chloride ions reach the standard, opening an outlet of the ultrafiltration membrane set, transferring the solution in the ultrafiltration membrane set into a concentration kettle to be treated, and obtaining a chelating agent product with the needed content; and 4, separating the filtered water to obtain by-products chlorine salt and water, wherein the water is used as flow circulating water for dilution and ultrafiltration. According to the method, the inorganic chlorine salt in the amino acid chelating agent product is separated through the ultrafiltration membrane, the inorganic chlorine salt is efficiently separated through the method, meanwhile, water-soluble organic matter is prevented from being brought out, and the inorganic chlorine salt obtained through separation through the method is dehydrated to obtain a qualified byproduct.

Description

technical field [0001] The invention belongs to the field of using amino acid chelating agents, in particular to a method for desalting amino acid chelating agents and a preparation method thereof. Background technique [0002] Chelating agents complex metal ions through coordination, thereby reducing or controlling the concentration of metal ions, and are widely used in mineral flotation processes, hydrometallurgy, extraction and separation of metal elements, catalytic synthesis of substances, water softening, and electroplating processes , pharmaceutical industry, dyeing process and other industrial processes. [0003] Traditional chelating agents mainly include phosphates, hydroxy acids, amino acids and acrylic polymers. This kind of chelating agent is rich in elements such as sulfur and phosphorus, which will make the water body eutrophic and pollute the environment. With the increasing awareness of people's health and environmental protection and the stricter regulati...

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Problems solved by technology

[0004] The synthetic method of above-mentioned amino acid chelating agent all adopts the method for recrystallization to separate inorganic chloride salt in the later stage, this method needs multiple recrystallization operations to make the product reach the standard, and because the good water solubility of chelating agent itself possesses, in the separation process A large amount of products will be taken away. Even after repeated washing and recovery, there are still a small amount of product residues in the inorganic chloride salts. The by-product inorganic chloride salts still need to be degraded to meet the standards, which not only increases the cost of synthesis and post-processing, but also loses some products, reducing Yield

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