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Solvent recovery method of caprolactam rearrangement reaction products and application thereof

A technology of caprolactam and rearrangement reaction, applied to the preparation of lactam, separation/purification of lactam, chemical instruments and methods, etc., can solve the problem of high processing load and energy consumption of solvent recovery tower, increased energy consumption of gas cycle compressor, Solvent recovery tower load and low energy consumption, to achieve the effect of reducing processing capacity and energy consumption, reducing efficiency and energy consumption, and reducing energy consumption

Active Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The method for above-mentioned separation and recovery solvent and carrier gas has the following problems: if the cooling temperature of the reaction discharge material is too high, after being separated into gas-liquid two-phase, the solvent component content in the obtained liquid phase is relatively low, and the load of the solvent recovery tower and Low energy consumption; however, the gas phase obtained by gas-liquid separation has a high content of solvent components, which will lead to increased energy consumption of the gas cycle compressor
If the cooling temperature of the reaction output is low, the content of solvent components in the gas phase obtained after separation into gas-liquid two-phase is low, and the energy consumption of the gas cycle compressor is low, but the content of solvent components in the separated liquid phase is relatively high , leading to higher processing load and energy consumption of the solvent recovery tower
Therefore, there is a defect of high comprehensive energy consumption

Method used

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  • Solvent recovery method of caprolactam rearrangement reaction products and application thereof
  • Solvent recovery method of caprolactam rearrangement reaction products and application thereof
  • Solvent recovery method of caprolactam rearrangement reaction products and application thereof

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specific Embodiment approach

[0035] attached figure 1 It is a schematic flow chart of the solvent recovery method for conventional cyclohexanone oxime rearrangement reaction products; the main equipment listed in the figure is only the main equipment, and other auxiliary equipment such as valves, pumps, compressors, etc. are ignored. like figure 1 As shown, the stream after gas phase rearrangement reaction of cyclohexanone oxime, that is, the crude product gas, is drawn out from pipeline 1, and enters gas-liquid separation tank 2 after heat exchange and cooling by heat exchanger, and is separated into gas-liquid two-phase, the operation of gas-liquid separation tank The temperature is 30-60°C and the pressure is normal pressure. The separated gas phase is drawn out through the pipeline 7, and is used as an inert carrier gas after being pressurized by a gas compressor and then sent back to the gas phase rearrangement reactor for reuse. The separated liquid phase is passed through the pipeline 5 Enter the ...

Embodiment

[0039] The flow chart is attached image 3 As shown, cyclohexanone oxime (taken from Sinopec Baling Petrochemical Yueyang Petrochemical General Plant) is gasified with methanol and nitrogen at a temperature of 450 ° C, and introduced into the gas-phase rearrangement reactor in the gas phase. Inside, cyclohexanone oxime is in contact with a catalyst containing ZSM-5 (produced by Sinopec Changling Catalyst Factory, the brand name is RBS-1), and the temperature is 350 ° C, and the absolute pressure is 2.5 bar. Gas-phase Beckmann rearrangement reaction generates caprolactam, and the reacted stream is discharged from the reactor through pipeline 1, and the discharge rate is 1000 kg / h. The composition of the reacted stream is listed in Table 1.

[0040] After the reaction, the stream is heat-exchanged to 65° C. and then enters the primary gas-liquid separation tank 2 for gas-liquid separation at an absolute pressure of 1.5 bar. The separated liquid phase enters the solvent recovery ...

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Abstract

The invention provides a solvent recovery method of caprolactam rearrangement reaction products and application of the solvent recovery method in preparation of caprolactam through gas-phase rearrangement of cyclohexanone-oxime. The caprolactam rearrangement products are led in a primary separating tank, gas-liquid separation is carried out at the absolute pressure of 1-5bar and at the temperature of 60-90 DEG C, and the separated liquid phase is led in a solvent recovery tower to be separated into caprolactam and a solvent. Heat exchange is carried out on a gas phase separated from the first stage separating tank until the temperature is 20-40 DEG C, the gas phase is separated by a second stage separating tank into the gas phase and the liquid phase, the separated liquid phase returns to a reactor to recycle, and the separated gas phase is delivered by a gas compressor to return to the reactor to recycle. In the solvent recovery method, two-stage gas-liquid separation on different temperature positions is carried out, so that handling capacity of the solvent recovery tower and a gas feeding quantity of the gas compressor are reduced, the separation efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for producing caprolactam by vapor phase rearrangement of cyclohexanone oxime, more specifically, relates to a method for solvent recovery in the process of producing caprolactam by gas phase rearrangement of cyclohexanone oxime. Background technique [0002] ε-caprolactam (hereinafter referred to as caprolactam) is the main raw material for the production of three series of products: nylon, industrial cord and nylon engineering plastics. With the increasing demand for domestic engineering plastics, its demand is also increasing year by year. [0003] In the industry, concentrated sulfuric acid or oleum is often used as a catalyst to produce caprolactam by the liquid-phase Beckmann rearrangement process of cyclohexanone oxime. The caprolactam produced by this process accounts for about 90% of the world's total production of caprolactam. Although the selectivity of this process to caprolactam reaches 98.5%, the biggest ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D223/10C07D201/04C07D201/16
Inventor 杨克勇江雨生范瑛琦赵娜王皓程时标
Owner CHINA PETROLEUM & CHEM CORP