Separation method of difficult separation system containing triethylamine

Abstract

The invention discloses a separation method of a triethylamine-containing system difficult to separate. According to the technical scheme, water, alkaline water or brine is adopted as an extractant, acontinuous or intermittent extraction process is adopted to separate triethylamine and a second component without introduction of new impurities, and the water can be recycled with no production of wastewater; then rectification is performed so as to remove residual triethylamine and second component in a raffinate phase, the relative volatility of the triethylamine and second component in the raffinate phase can be changed greatly, and high-content triethylamine and second component can be recovered efficiently from the raffinate phase containing low content of triethylamine and second component; and the operation in the distillation step can be completed by using a simple rectification unit, the evaporation amount is limited, and the energy consumption is controllable; therefore, extraction and rectification are coupled in the process so as to realize separation of triethylamine and the second component, and since water, alkaline water or brine is adopted as the extractant in the whole process with no introduction of other impurities, and addition of the alkali or salts is beneficial to separation of the triethylamine and the second component, the process has the advantages of simple equipment, investment cost saving, simple operation and operation cost saving, and the advantages are innovation points of the process.

Description

technical field [0001] The invention relates to the fields of pharmaceutical solvent recovery and industrial wastewater or waste liquid treatment, in particular to a separation method for a difficult-to-separate system containing triethylamine. Background technique [0002] Triethylamine (molecular formula: N(CH 2 CH 3 ) 3 ) is an amine organic compound, a colorless to pale yellow transparent liquid with a strong ammonia odor, slightly fumes in the air, slightly soluble in water, soluble in ethanol and ether, and its aqueous solution is alkaline It is an organic base, catalyst, solvent and raw material commonly used in drug synthesis. [0003] Triethylamine and isopropanol are widely used in petrochemical, pharmaceutical and chemical fields. Especially triethylamine, because its price is high, consider from production cost and reduce pollution, triethylamine recycling has higher practical significance. The recovery rate and recovery quality of triethylamine directly aff...

AI Technical Summary

Problems solved by technology

However, azeotropic distillation has its own limitations: in terms of energy consumption, the cost is higher than other methods; in terms of equipment investment, it is often larger than other methods, and the product purity is difficult to guarantee

However, the cost of using ionic liquid is high, and a third organic component is introduced, which makes it difficult to recycle the separated triethylamine and isopropanol in the original process

Extractive distillation In the process of industrial production, it is very difficult to select the extractant. It is necessary to use a conventional extractant and ensure an efficient extraction effect; there are still problems to be solved in terms of energy consumption in the process of separation and reuse of the extractant

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