An electric extraction process for simultaneous extraction and recovery of metal elements and functional organic compounds

Abstract

The invention discloses an electric extraction process for simultaneously and efficiently extracting and recycling metal elements and functional organic compounds. The process is characterized by comprising the following steps: mixing wastewater containing the functional organic compounds and metal ion wastewater, and performing reflux condensation reaction to coordinate metal ions and the functional organic compounds to obtain a metal complex solution of the functional organic compounds; introducing the metal complex solution of the functional organic compounds into an electro-dialysis system as a concentration compartment solution and a diluting compartment solution of the electro-dialysis system to be treated to enrich a metal complex of the functional organic compounds in a diluting compartment in a concentration compartment, removing the metal complex of the functional organic compounds in the diluting compartment, and recycling the metal complex of the functional organic compounds in the concentration compartment. According to the process, two kinds of wastewater can be treated, and in addition, the metal ions in the metal ion wastewater and the functional organic compounds in high-TOC organic wastewater can be recycled without secondary pollution; the process is easy to operate and low in energy consumption.

Description

technical field [0001] The invention relates to an electric extraction process for simultaneously extracting and recovering metal elements and functional organic compounds. Background technique [0002] A large amount of wastewater with high TOC content will be produced in the fields of food processing, pharmaceutical chemical industry, and papermaking. Take the Claisen condensation reaction for the production of synthetic chemical intermediates as an example. During the reaction, two molecular esters or one molecular ester Condensation with a molecule of carbonyl compound under the action of a strong base, loss of a molecule of alcohol to generate a molecule of β-ketoester or β-diketone, the reaction equation is as follows: [0003] [0004] The Claisen condensation reaction can be used to synthesize a series of important organic intermediates, such as ethyl acetoacetate Acetylacetone and fatty acids etc. Taking acetylacetone as an example, in the Claisen condensati...

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Problems solved by technology

However, these methods have high energy consumption, high operating costs, easy fouling of the membrane, and small processing capacity, which to a certain extent increases the cost of wastewater treatment.

[0005] In the production process of electroplating, pickling, electrolysis and metallurgical industries, a large amount of metal wastewater will be produced, such as chromium, nickel, cobalt, copper, lead, etc. These metals are very toxic to organisms and humans, and it is difficult to Degraded by microorganisms in nature, these wastewater treatment processes are complex and pollute the environment. The general methods include chemical precipitation, electrolysis, solvent extraction, ion exchange, membrane separation, biosorption, etc., US7914676 and US5587079 has reported a method of using hydrogen sulfide as a reducing agent to remove heavy metal ions in wastewater. Since heavy metal ions and hydrogen sulfide are removed in the form of precipitation, a large amount of metal sulfides are produced, which are difficult to be secondary Utilize, and have produced potential secondary pollution; US4954230 has reported a kind of method that utilizes electrolysis and adsorption to electrolyze and recover metal ions from metal ion wastewater, although electrolysis has a good effect on metal ions, especially heavy metal ions. However, due to the precipitation of metal on the surface of the electrode, the treatment capacity will continue to decrease, and the current efficiency will also decrease, which not only reduces the treatment capacity of wastewater but also increases the maintenance and operating costs of the electrode; patents CN103638992A and CN102583822A reported A method of removing heavy metal ions from metal ion wastewater by using cation exchange resins, but because the ion exchange resins are more expensive, and the resins that have chelated metal ions need to be regenerated with acid or alkali, this increases the operation to a certain extent. It is costly and the metal ion solution washed down is also difficult to handle; in addition, the solvent in the solvent extraction method will be lost during the extraction process and the regeneration process consumes a lot of energy. The biosorption method is selective for metals and the metal concentration in the wastewater has an upper limit requirement.

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