System and method for utilizing heat energy of oximation device

Abstract

The invention discloses a system and a method for utilizing heat energy of an oximation device. The system comprises a TBA (Tert Butyl Alcohol) recovery tower feeding heat energy recoverer, a TBA recovery tower, a valve 1, a valve 2, an oximation wastewater steam stripping evaporator, a methylbenzene oximate heat energy recoverer, a first rectification tower, a TBA recovery tower gas-phase condenser, a TBA reflux tank, a wastewater steam condenser, a mechanical vacuum pump and a condensed wastewater recovery tank, wherein the oximation wastewater steam stripping evaporator and the methylbenzene oximate heat energy recoverer are in parallel and serial arrangement. According to the system and the method for utilizing the heat energy of the oximation device, disclosed by the invention, heat of high-temperature condensate during a production process of caprolactam can be recovered through the TBA recovery tower feeding heat energy recoverer, and heat of gas-phase steam flowing out of the TBA recovery tower can be recovered through the oximation wastewater gas stripping evaporator and the methylbenzene oximate heat energy recoverer which are in parallel and serial arrangement, so that the using amount of boiler steam is reduced; through the whole system and the method, the boiler steam can be saved by about 1.5 to 1.6 tons through the production of caprolactam per ton, the cost of steam is reduced from original 560 yuan to about 310 yuan, and huge economic benefit is gained.

Description

technical field [0001] The invention relates to the technical field of cyclohexanone oxime production, in particular to a thermal energy utilization system and utilization method of an oximation device. Background technique [0002] Cyclohexanone oxime is obtained by the oximation reaction of cyclohexanone, which is an important intermediate product in the production of caprolactam. There is a lot of waste of heat in the production of the current oximation device, and the heat cannot be recycled well. For example, on the one hand, t The material heating steam of the butanol recovery tower is provided by the boiler. On the other hand, in the production of caprolactam, the heat of the higher temperature steam condensate of each heater cannot be utilized step by step, and can only be wasted; and the recovery of tert-butanol The gas-phase heat energy of the tower is directly condensed through circulating water or directly condensed through an evaporative condenser, which not onl...

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Problems solved by technology

[0002] Cyclohexanone oxime is obtained by the oximation reaction of cyclohexanone, which is an important intermediate product in the production of caprolactam. There is a lot of waste of heat in the production of the current oximation device, and the heat cannot be recycled well. For example, on the one hand, t The material heating steam of the butanol recovery tower is provided by the boiler. On the other hand, in the production of caprolactam, the heat of the higher temperature steam condensate of each heater cannot be utilized step by step, and can only be wasted; and the recovery of tert-butanol The gas-phase heat energy of the tower is directly condensed through circulating water or directly condensed through an evaporative condenser, which not only consumes more circulating cooling water but also causes a waste of gas-phase heat energy in the tert-butanol recovery tower;

[0003] In the production and refining process of cyclohexanone oxime, tert-butanol needs to be recycled as a solvent in the synthesis of cyclohexanone oxime. The aqueous solution of cyclohexanone oxime needs to be extracted and purified with toluene to obtain toluene oxime and produce oximation wastewater. Toluene oxime generally contains 75 % of toluene and about 25% of cyclohexanone oxime, toluene oxime needs a rectification tower to separate toluene to obtain cyclohexanone oxime, the current toluene oxime directly enters the rectification tower, requiring a large amount of heat for rectification; in addition, oxime The waste water containing toluene needs to be stripped, and the waste water needs to be treated; the heat required by each equipment in the current production of cyclohexanone oxime is provided by the outside, and the process waste heat in each link is directly discharged, and each link has not been realized. The efficient recycling of heat results in waste of heat and high production costs

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