A kind of method of energy-saving refining acetate

Abstract

The invention discloses an energy-saving acetic ester refining method. The method is characterized in that a pressure regulation valve is arranged at the top of a head oil tank; low-boiling point components in a system are intermittently discharged to a recovery system for treatment; a gas phase at the top of a fractionating tower is used for heating primary ester feed from an esterification tower or a washing tower to convert the primary ester feed into two parts, i.e. a gas phase and a liquid phase; the afterheat of steam is used for heating the liquid phase part of the primary ester feed subjected to primary heat exchange to gasify a part of the liquid phase; the gas phase and liquid phase of the primary ester feed enter different proper positions of the fractionating tower respectively; an oil phase of head oil which is subjected to phase separation is subjected to heat exchange with a finished product discharged from the bottom of the fractionating tower to be heated to temperature matched with the gas phase at the top of the fractionating tower, and enters an inlet in the upper part of the fractionating tower for refluxing. According to the method, low-boiling point impurities in the system can be released in time, the energy consumption of a refining process can be lowered, the energy consumption of a unit weight of product can be lowered by 5 to 20 percent, and the product obtained by the method is high in purity.

Description

technical field [0001] The invention relates to an energy-saving method for refining acetate, in particular to a method for refining acetate by adopting pressure rectification combined with multi-stage heat exchange technology. Background technique [0002] Acetate esters of lower fatty alcohols are a common class of acetates, often used as diluents in the fields of coatings, inks and adhesives. Common acetates of lower fatty alcohols include ethyl acetate, propyl acetate, and butyl acetate. [0003] As the requirements for energy saving and environmental protection are getting higher and higher, manufacturers of acetate are paying more and more attention to the reduction of energy consumption in the production process of acetate. Moreover, the price competition of these conventional products is becoming more and more fierce, which requires manufacturers to continuously seek ways to reduce production costs, so manufacturers need to continuously develop more energy-saving an...

AI Technical Summary

Problems solved by technology

[0007] With such a refining system, there is no heat coupling process. The initial ester enters the rectification tower without prior preheating, which may easily cause heat and mass transfer disorder in the tower. The oil phase pumped to the top of the tower does not undergo prior preheating. It will also quench part of the gas phase at the top of the tower, increase the load of the reboiler at the bottom of the tower, and cause a decrease in the separation efficiency of the rectification tower

The low-boiling point alcohol brought in by the raw material alcohol and some low-boiling point impurity esters formed after the esterification of acetic acid have been circulating in the refining system along with the oil phase, and have no source, which also increases the energy consumption of the refining system

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