A kind of start-up method of acetone one-step synthesis of methyl isobutyl ketone technology

Abstract

The invention discloses a starting method for synthesis technology of methyl isobutyl ketone by acetone through a one step method. The method comprises the following steps: 1) a noble metal catalyst is reduced, the temperature of a catalyst bed layer is adjusted to the feeding temperature; 2) acetone with an initial water content being 6wt%-30wt% is introduced in a reactor; 3) after adsorption temperature rise wave passes through all the catalyst bed layer, the water content of acetone is reduced by 3-15 percentages; 4) after 1-10 hours, the water content of acetone is continuously reduced by3-15 percentages; 5) optionally, the step 4) is repeated for 0-4 times; and 6) until the water content of acetone satisfies the normal feeding requirement, commencement of works is finished, and normal production starts. The method is capable of realizing staggered release of adsorption heat and reaction heat during operation, and effectively solves the overtemperature problem of the catalyst bedlayer.

Description

technical field [0001] The invention relates to a production technology for synthesizing methyl isobutyl ketone from acetone, in particular to a start-up method for synthesizing methyl isobutyl ketone in one step from acetone. Background technique [0002] Methyl isobutyl ketone (4-methylpentanone-2, methyl isobutyl ketone referred to as MIBK) is an important derivative of acetone (AC). , polyvinyl chloride, polyvinyl acetate, polystyrene, epoxy resin, natural and synthetic rubber, solvent for paint, paint and oil dewaxing, coloring agent for color film, and also used as an extractant for penicillin fermentation broth and Separating agent for some organic salts, and it is also the main raw material for rubber anti-aging agent 4020 and some organic synthesis. [0003] The traditional production method of MIBK is a three-step method: the first step: two molecules of acetone are condensed under the action of a basic catalyst to generate one molecule of diacetone alcohol; the s...

AI Technical Summary

Problems solved by technology

The three-step method can only be carried out in different reactors due to the different mechanism of each step, and the reaction conditions and catalysts are different. The production process is long, the process is complicated, the production efficiency is low, and the product cost is high.

But its disadvantages are: when the technology is industrialized, it is found that the reaction raw materials are fed at 90°C, the thermal effect of the reaction is relatively large, the temperature of the inlet section of the catalyst bed is too high, and there is an over-temperature problem. During the start-up of the device, a period of process conditions is usually required Adjust the stabilization period before the device can enter stable operation

The disadvantage of this start-up method is that the bed temperature drops to 50°C after the catalyst is reduced. Compared with the 90°C feed in the first start-up method, the feed temperature is slightly lower, and the reaction inlet temperature needs to be raised to 90°C again. Therefore, this part of energy consumption cannot be saved; but the advantage is that there is no reaction overtemperature problem in the device, and the process of reheating the reaction feed is a process of adjusting the reaction conditions. After the reaction feed temperature reaches 90 ° C, the device will Can quickly stabilize and no longer fluctuate

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