164462-16-2Relevant articles and documents
PROCESS FOR MANUFACTURE OF A COMPLEXING AGENT
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Page/Page column 7; 8; 9, (2021/09/11)
A process for making a complexing agent with an enantiomeric excess of at least 60%, wherein said process comprises the following steps: (a) reacting an aqueous slurry of alanine with an enantiomeric excess of at least 60% with formaldehyde and hydrocyanic acid, thereby forming an aqueous solution of alanine- bisacetonitrile, (b) saponifying the alanine-bisacetonitrile from step (a) by combining the aqueous solution obtained in step (a) with an aqueous solution of alkali metal hydroxide.
Amino acid type chelating agent as well as large-scale preparation method and application thereof
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Paragraph 0304-0311; 0392-0393, (2019/07/04)
The invention provides degradable amino acid type chelating agent composition suitable for large-scale industrial production and a preparation method of the degradable amino acid type chelating agentcomposition. Amino acid, haloacetic acid and alkali in an aqueous solution are subjected to a reaction at reaction temperature of 40-120 DEG C in a regulated pH range of 8-13 under the action of an iodide catalyst, and after the reaction, the amino acid type chelating agent composition is obtained. The method has the characteristics of being safe, efficient and free of amplification effect, containing fewer impurities and facilitating realization of large-scale production; the raw materials are easily available, and reaction yield is high; an obtained product has better application performance. The invention further provides an application of the composition as a chelating agent in the fields of daily chemicals, food, agriculture, forestry, papermaking, textile, printing and dyeing, watertreatment, coal and the like.
Preparation method of green chelating agent trisodium N,N-bis(carboxymethyl)alanine
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Paragraph 0014; 0017-0020, (2019/03/08)
The invention provides a preparation method of a green chelating agent trisodium N,N-bis(carboxymethyl)alanine. The method specifically comprises the steps as follows: partially or completely neutralized L-alanine and chloroacetic acid are subjected to an SN2 bimolecular nucleophilic substitution under an alkaline condition that the pH value is 10-12 in a water solution reaction system to producetrisodium methyl glutamate diacetate. In the reaction process, water in the reaction system is timely removed out at constant speed under the negative pressure of 0-minus 0.005 MPa, so that reaction substrates always keep higher reaction activity. The method is short in reaction cycle and simple in production process, and the production process is simple, and the product yield can reach 99%; chloroacetic acid replaces highly toxic substances such as hydrocyanic acid and the like, thus, the method is safe and environmentally friendly; produced water can be recycled to be used for reaction synthesis and product dilution, no toxic byproducts or wastewater is produced, the cost is low, and large-scale industrial production is facilitated.