Method for synthesizing EDTA (ethylene diamine tetraacetic acid) calcium sodium salt hydrate by low molecular alcohol precipitation at low boiling point

Abstract

The invention discloses a method for synthesizing EDTA (ethylene diamine tetraacetic acid) calcium sodium salt hydrate by low molecular alcohol precipitation at a low boiling point. The method mainlycomprises the following steps: adding EDTA disodium and calcium salt in hot desalinized water; and adding alcohol, standing and filtering to obtain the EDTA calcium sodium salt product. The EDTA calcium sodium salt hydrate is prepared by the method, a high-temperature and high-pressure process does not exist, required equipment and process are simple, and the investment risk is small. Compared with a traditional process, the process has the advantages that a concentrate process does not exist, and effects of energy conservation and emission reduction are obvious. The product is obtained by a liberation method, and thus, the product is uniform in granularity and excellent in quality. Meanwhile, alcohol which is rectified and recycled in the method can serve as recycled alcohol and is used as a precipitation agent for an experiment in next time, remaining water is used as a solvent for the experiment in next time, wastes are not discharged in a whole technological process, and the benefit of environmental protection is high.

Description

technical field

[0001] The invention relates to the field of organic chemical synthesis, in particular to a process method for synthesizing EDTA calcium sodium salt by a low boiling point and low molecular weight alcohol analysis method. Background technique

[0002] EDTA calcium sodium salt is a very commonly used food additive. At the same time, calcium is one of the essential weight elements for plants. In chemical fertilizers, EDTA calcium sodium salt can effectively prevent calcium ions from forming water-insoluble substances with phosphate and sulfate ions. It can be used in the production of high-end fertilizers such as fully water-soluble fertilizers and liquid fertilizers. , has good economic and practical value.

[0003] The third issue of Volume 5 of the Journal of Shandong Institute of Light Industry announced a preparation process route of calcium sodium salt of ethylenediaminetetraacetic acid. Calcium sodium diamine tetraacetate, the method has the advantages...