Method for preparing diisobutyl ketone

Abstract

The invention discloses a method for preparing diisobutyl ketone. The method comprises the following steps: 1, transferring a mixture raw material extracted from a tower kettle of a methyl isobutyl ketone light component tower and mainly containing diisobutyl ketone into a reaction tank; 2, adding a silica-gel drier into the reaction tank, and performing stirring at rotating speed of 100 revolutions / min; 3, filtering the mixture raw material in the reaction tank by virtue of a filter; 4, delivering filtrate obtained by filtration into a preheater for preheating at preheating temperature of 76 to 94 DEG C; 5, delivery the preheated filtrate into a rectification tower for rectification, wherein the temperature of the top of the tower is controlled to be 104 to 126 DEG C, the side stream temperature is 156 to 177 DEG C, and the temperature of a tower kettle is 167 to 189 DEG C; 6, producing a diisobutyl ketone finished product from a side stream of the rectification tower, and charging the diisobutyl ketone finished product. According to the method, the temperature difference of boiling points of each substance is increased, and the rectification efficiency of the rectification tower is favorably improved, so that the purity of the diisobutyl ketone is improved on the premise of simplifying a purification process, and the economic benefits of the diisobutyl ketone are further greatly improved.

Description

technical field [0001] The invention relates to chemical raw materials, in particular to a method for preparing diisobutyl ketone. Background technique [0002] Diisobutyl ketone, also commonly known as 2,6-dimethyl-4-heptanone, 4,6-dimethyl-2-heptanone, is a low-toxicity chemical, and inhalation of high concentrations is harmful to the nose and throat It has a irritating effect, and the maximum allowable concentration in the air is 240mg / m3, but this chemical can be used as a solvent for industrial coatings, such as: plastic paint and vacuum plating paint, and is also a solvent for nitrocellulose, acrylic resin, vinyl paint and organic An excellent solvent for dispersants; its main features are non-biting, strong solvency, improved coating leveling, gloss, recoatability and wettability to plastic substrates, and increased adsorption. It can also be used as a dispersant for the manufacture of organic sols, a solvent for food refining, and an intermediate for some drugs and ...

AI Technical Summary

Problems solved by technology

[0003] In this process, the enterprise generally sends the mixture with diisobutyl ketone as the main liquid extracted from the tower tank during the production of methyl isobutyl ketone into the rectification tower for rectification treatment, and then The finished product diisobutyl ketone is produced from the side line of the rectification tower, and the purity of diisobutyl ketone obtained therefrom is generally 84-90%, so the purity is generally relatively low and cannot be better utilized