Desalting method of amino acid chelating agent

An amino acid, chelating agent technology, applied in chemical instruments and methods, preparation of organic compounds, semi-permeable membrane separation, etc., can solve problems such as increasing synthesis and post-processing costs, losing products, and reducing yields

Pending Publication Date: 2021-06-04

SHANDONG TAIHE WATER TREATMENT TECH CO LTD

4 Cites 0 Cited by

AI-Extracted Technical Summary

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...

Method used

Preferably, its processing equipment comprises dilution kettle 1, and described dilution kettle 1 is communicated with brine separator 2, and described brine separator 2 is communicated with external steam kettle 3, and described external steam kettle 3 is communicated with pure The water transfer tank 4 is connected, and several sets of ultrafiltration membrane groups are arranged in the brine separator 2 . The invention can efficiently separate the inorganic salt, realize that the ...

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.

Application Domain

Organic compound preparationUltrafiltration +1

Technology Topic

UltrafiltrationEnvironmental chemistry +7

Image

Examples

Experimental program(1)

Example Embodiment

[0046] Example 1

[0047] Step 1: The reaction completed amino acid chelating agent mother liquor is diluted into a solution of 20% of the chelating agent content;

[0048] Step 2: Transferring the aqueous solution of step into the ultrafiltration membrane assembly to do ultrafiltration, use flowing pure water as a filtration receptor, enclosing the ultrafiltration membrane group outlet, and pump pure water from the inlet into ultrafiltration with a pressure pump. In the film group, the working pressure of the ultrafiltration membrane was controlled at 1.5 MPa;

[0049] Step 3: After the ultrafiltration film is operated 11.5 h, the chloride ion content in the solution in the ultrafiltration membrane is lowered to 0.78%, turn on the ultrafiltration membrane group outlet, and transfer the internal solution into the concentrate to carry out the concentrated dilution treatment, resulting the desired Chelating agent product;

[0050] Step 4: The filtered water is evaporated to evaporated to separate the by-product chloride and water, water for dilution and ultrafiltration flow cycle water.

[0051] Example 1

[0052] Step 1: Dry the reaction of the amino acid chelating agent of the reaction to 25% aqueous solution of the chelating agent content;

[0053] Step 2: Transferring the aqueous solution of step into the ultrafiltration membrane assembly to do ultrafiltration, use flowing pure water as a filtration receptor, enclosing the ultrafiltration membrane group outlet, and pump pure water from the inlet into ultrafiltration with a pressure pump. In the membrane group, the working pressure of the ultrafiltration membrane was controlled at 1.8 MPa;

[0054] Step 3: After the ultrafiltration membrane is operated 9.4 h, the chloride ion content in the solution in the ultrafiltration membrane group decreased to 0.95%, opened the ultrafiltration membrane group outlet, and transfer the internal solution into the concentrate to carry out the concentrated dilution treatment, resulting the desired Chelating agent product;

[0055] Step 4: The filtered water is evaporated to evaporated to separate the by-product chloride and water, water for dilution and ultrafiltration flow cycle water.

[0056] Example 1

[0057] Step 1: Phase the reaction completed amino acid chelating agent mother liquor to dilute the water solution of 30% of the chelating agent content;

[0058] Step 2: Transferring the aqueous solution of step into the ultrafiltration membrane assembly to do ultrafiltration, use flowing pure water as a filtration receptor, enclosing the ultrafiltration membrane group outlet, and pump pure water from the inlet into ultrafiltration with a pressure pump. In the membrane group, the working pressure of the ultrafiltration membrane was controlled at 12 MPa;

[0059] Step 3: After the ultrafiltration membrane is operated 7.3 h, the chloride ion content in the solution in the ultrafiltration membrane group is reduced to 0.69%, and the ultrafiltration membrane is opened, and the internal solution is transferred to the concentrate to concentrate the dilution treatment, resulting the desired Chelating agent product;

[0060] Step 4: The filtered water is evaporated to evaporated to separate the by-product chloride and water, water for dilution and ultrafiltration flow cycle water.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.