Device and method for producing tri-n-butylamine by extractive rectification heavy component removal

Abstract

The invention discloses a device for producing tri-n-butylamine by extractive rectification heavy component removal. The device comprises a fixed bed reactor, an n-butylamine removal tower, a di-n-butylamine removal tower, a tri-n-butylamine light component removal tower, a molecular distillation tower, an extractive rectification tower and an extractant regeneration tower; the bottom outlet of the molecular distillation tower, an extractant supplementing pipeline and the tower bottom liquid outlet of the extractant regeneration tower are joined by a cross tee, and then are communicated with the feed port of the extractive rectification tower; the top outlet of the molecular distillation tower is a light impurity outlet, and the tower top distillate port of the extractant regeneration tower is a heavy impurity outlet; and the tower bottle liquid outlet of the tri-n-butylamine light component removal tower is a tri-n-butylamine discharging tube. The present invention also discloses a method for producing tri-n-butylamine by extractive rectification heavy component removal through using the device. Heavy impurities (mainly including N-butylbutyramide) are discharged from the tri-n-butylamine production system in an extractive rectification manner, so the quality of the tri-n-butylamine product is ensured, and the energy consumption of the device is reduced.

Description

technical field [0001] The invention belongs to the field of low-carbon aliphatic amine production, and in particular relates to a tri-n-butylamine production device and process for extracting, rectifying and deweighting. Background technique [0002] Tri-n-butylamine, whose molecular formula is C 12 h 27 N, CAS number: 102-82-9, molecular weight 185.35, boiling point 216.0-217.0°C under normal pressure. Tri-n-butylamine is a colorless or light yellow liquid at normal temperature and pressure. It has a special odor and is weakly alkaline. It is easily soluble in ethanol, ether, etc., and slightly soluble in water. It has a wide range of industrial uses, is an important organic chemical intermediate, and is also an excellent reagent, emulsifier, extractant, insecticide and preservative. [0003] The main production process of tri-n-butylamine, such as figure 1 As shown, the raw material liquid composed of n-butylamine, di-n-butylamine and n-butanol is vaporized in the fix...

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Problems solved by technology

The applicant's previous patent (ZL 2017100096741, tri-n-butylamine recovery method and the recovery device used) has proposed a method for recovering tri-n-butylamine from the overhead liquid of the stripping tower, and the light impurity IDA in the production system The production system is discharged and tri-n-butylamine is recovered and returned to the production system. However, during the implementation process, as the operating time of the production device increases, the impurity N-butylbutanamide with a higher boiling point continues to accumulate, while the method described in ZL 2017100096741 N-butyl butyramide cannot be discharged from the production system, and it is even more troublesome to find that N-butyl butanamide and tri-n-butylamine have formed an azeotropic system (the mass fractions of N-butyl butanamide and tri-n-butylamine are respectively 3% and 97%), so conventional rectification can't discharge N-butyl butyramide from the production system, the impurity continues to accumulate and affects the purity of product tri-n-butylamine, in order to ensure the quality purity of tri-n-butylamine More than 99.5%, the energy consumption of the whole device is constantly increasing, so it is necessary to develop a new process route to ensure that light and heavy impurities in the device are discharged from the production system at the same time

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