The object of the present innovation is to, for the acetone in the prior art 2-methylpentane/acetone azeotrope is not recycled, cause the trouble that raw material acetone usage is high, give a sort of boosted item separation technique, to lower acetone usage, thereby lowering the manufacturing expense of the product. The technical plan of the present invention is as complies with: the reaction raw material acetone is responded in the existence of a hydrogen-containing gas and a stimulant, the catalyst is separated into a hydrogen-containing gas via a gas-liquid separator, and also the staying liquid is cooled down and cooled down, and after that firstly goes into the 2-methylmethane Base pentane tower, 2-methylpentane as well as acetone are distilled from the top of the tower in the form of azeotrope (the theoretical azeotrope make-up is 56wt% 2-methylpentane and also 44wt% acetone under typical pressure), the kettle fluid enters the acetone recuperation tower. In the acetone healing tower, the excess acetone is vaporized from the top of the acetone recuperation tower as well as circulated to the reaction system; the pot fluid gets in the very first phase separator to separate the water phase and also the oil stage, the water phase departures the tool, and also the oil stage gets in the MIBK in the dehydration tower. In the MIBK dehydration tower, water as well as methyl isobutyl ketone are eliminated from the top of the tower in the form of an azeotrope (its azeotrope structure is 75 wt% methyl isobutyl ketone, 25 wt % water at normal stress) After steaming, it enters the 2nd phase separator. After phase separation, the oil phase is utilized as the reflux of the MIBK dehydration tower, and the water phase spurts from all-time low of the 2nd phase separator and is sent of the device. The MIBK dehydration tower still liquid enters the methyl isobutyl ketone tower, the methyl isobutyl ketone is steamed from the top of the tower, and also the heavy components continue to be in the still liquid. The reconstituted is a mix of diisobutyl ketone (DIBK) and also mesitylene (TMB).
The present invention is characterized in that, on the basis of the existing method, an extraction and recovery step for acetone is added, and the azeotrope (2-methylpentane/acetone) that comes out from the top of the 2-MPA tower is separated to recover acetone, so The process of described acetone extraction and recovery is: the azeotrope that the 2-MPA tower top comes out first enters the extraction device to extract with water, then in the phase separator, the extraction mixed solution is phase-separated, and the separated oil phase (2-methyl) pentane) directly out of the apparatus, and the separated aqueous phase (mixture of water and acetone) is reserved for further processing.
The above-mentioned separated water phase can be further processed by the following methods: it can be directly recycled to the acetone recovery tower feed port, and after mixing with the material from the bottom of the 2-methylpentane tower, it enters the acetone recovery tower; or the separated water The phase first enters the crude dehydration tower for dehydration, and the dehydrated acetone (containing 95wt% of acetone and 5wt% of water) is recycled to the feed port of the acetone recovery tower, mixed with the material from the bottom of the 2-methylpentane tower, and then enters the acetone Recovery tower; the separated water phase can also be firstly entered into a fine dehydration tower for dehydration, and the dehydrated acetone (with water content of less than 0.5wt%) is directly recycled to the feed port of the reaction system.
The above-mentioned extraction is carried out by utilizing the properties that acetone and water can be mutually dissolved in any proportion, and the extraction device used can be a conventional extraction tower or a stirred tank, and the weight ratio of the extraction feed to water is 1 : 1 to 1: 0.2. The acetone extractant used in the present invention can be water, and can also be other solvents that are mutually soluble with acetone and insoluble with 2-MPA.