Synthesis process of composite piperazine heavy metal chelating agent TDDP

Abstract

The invention discloses a synthesis process of a composite piperazine heavy metal chelating agent TDDP, which comprises the following steps: by using ethylenediamine and glyoxal as raw materials, carrying out a condensation reaction in the presence of a catalyst to generate dipiperazine; taking organic alkali tetramethyl guanidine as a catalyst, and reacting dipiperazine with carbon disulfide andsodium hydroxide to generate TDDP; and meanwhile, reacting ethylenediamine with carbon disulfide and sodium hydroxide to generate EDTC. Compared with the prior art, the beneficial effects of the invention are that: under a designed reaction condition, a solution obtained after dipiperazine is synthesized is used for preparing TDDP, excessive ethylenediamine reacts with carbon disulfide and sodiumhydroxide to generate another heavy metal precipitant EDTC; therefore, the prepared heavy metal chelating agent target product can obtain a removing agent with the function of removing heavy metal ions of a cyclic structure and a linear structure at the same time without secondary compounding, the application field is expanded, and the heavy metal ion removing effect is particularly obvious.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, and in particular relates to a synthesis process of a composite piperazine heavy metal chelating agent TDDP. The composite piperazine heavy metal chelating agent can be used for removing heavy metals in waste water and fly ash. Background technique [0002] With the rapid development of modern industry, the content of heavy metals in industrial waste liquid is getting higher and higher, and the problem of environmental pollution caused by heavy metals has become increasingly prominent, seriously affecting the health and survival of human beings and other organisms. Because such pollutants cannot be biodegraded, they can enter plants and animals through the biological chain cycle, and eventually endanger human health. Moreover, even trace amounts of heavy metals can produce toxic effects. Using effective treatment methods to reduce the content of heavy metals in industri...

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Problems solved by technology

[0024] In the in-depth study of the material ratio, reaction temperature control, and reaction time of the existing TDDP synthesis process, it was found that the existing TDDP synthesis in China has no segmental control of the reaction temperature, which leads to the failure of the reaction, unreasonable raw material ratio, and long reaction time. , many side reactions and other defects, the technical problems to be solved by the present invention include:

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