tert-butanol-water-cyclohexanone oxime differential-pressure rectification system

A technology of cyclohexanone oxime and differential pressure rectification, which is applied in the field of tert-butanol-water-cyclohexanone oxime differential pressure rectification system, can solve problems such as energy mismatch, achieve energy saving and realize full energy The effect of using

Active Publication Date: 2015-12-09
TIANJIN TIANDI CHUANGZHI TECH DEV
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of high energy consumption of single-column rectification and the mismatch of classic double-effect rectification energy, reduce the consumption of steam and coo

Method used

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  • tert-butanol-water-cyclohexanone oxime differential-pressure rectification system

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Embodiment 1

[0027] Take the treatment of 100 tons of tert-butanol-water-cyclohexanone oxime raw material solution per hour as an example for description.

[0028] A kind of tert-butanol-water-cyclohexanone oxime differential pressure rectification system, such as figure 1 As shown, the pressure of the tert-butanol-water-cyclohexanone oxime raw material liquid A from the reaction tank area is 4MPaA, and the temperature is 85°C. According to the split ratio of high-pressure tower: low-pressure tower: 1:1.25, it is divided into two streams, and one stream passes through the first A preheater 1 is preheated and sent to the high-pressure tower feed port 15 of the high-pressure tower 2. After preheating, the temperature is 93° C., the operating pressure of the high-pressure tower is 0.17 MPaA, the temperature at the top of the tower is 92° C., and the temperature of the tower kettle is 120°C, the first tower reboiler 5 (one-pass reboiler) is heated by low-pressure steam, and the high-pressure t...

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Abstract

The invention discloses a tert-butanol-water-cyclohexanone oxime differential-pressure rectification system. The system comprises high and low pressure rectification towers and corresponding kettle reboilers, a raw-material preheater, a pump, a condenser, a compression system and a reflux system. Tower-top steam in the high pressure rectification tower is used as a feedstock of the preheated low pressure rectification tower by setting the operation pressures of the high and low pressure rectification towers when the system is operated, so that the phase-change latent heat of the high-pressure rectification tower top steam is fully utilized. The kettle temperature is controlled by controlling the operation pressure of the high pressure rectification tower, and by controlling the low pressure rectification tower, the bubble point temperature of the high pressure tower top steam is higher than the feedstock temperature of the low pressure rectification tower by 0-50 DEG C. The steam at the tops of the towers are condensed, one part of the steam is sent to the corresponding rectification towers for refluxing, and the residue is sent to a kettle liquid area, and noncondensable gas in the system is compressed and sent out of the rectification system. The consumed steam amount of the differential-pressure rectification system is 40-55% of that of a single-tower rectification system.

Description

technical field [0001] The invention belongs to the technical field of purification of chemical products, in particular to a tert-butanol-water-cyclohexanone oxime differential pressure rectification system. Background technique [0002] In the caprolactam plant, in order to accelerate the mass transfer effect of the ammoximation reaction, tert-butanol is introduced as a solvent for cyclohexanone oxime during the reaction, so that the reactants and reaction products are uniformly mixed in the reactor. The reaction solution is firstly separated from tert-butanol, water, and cyclohexanone oxime by filtering the insoluble matter such as catalyst. Since tert-butanol is used as an organic solvent of cyclohexanone oxime, it does not participate in the reaction and has an adverse effect on the subsequent rearrangement. To improve the yield of caprolactam and the utilization rate of tert-butanol, it needs to be recycled. [0003] Since the boiling point and relative volatility of t...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C31/12C07C29/80
Inventor 邵宏伟张思捷李文鹏
Owner TIANJIN TIANDI CHUANGZHI TECH DEV
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