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Device and method of continuously separating solid-liquid phases in caprolactam distilled heavy residual liquid

A caprolactam, solid-liquid phase technology, applied in the chemical industry, can solve the problems of low filtration efficiency and poor weighing weight of filter cloth centrifuges

Active Publication Date: 2017-07-14
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By using sand core funnels of different specifications G4: 5-15 μm, G5: 2-5 μm, G6: <2 μm, weigh the weight difference after filtering and drying the weight residue, it is found that the weight of G4 is obviously smaller than that of G5 and G6, so the water The diameter of insoluble particles is mostly below 5 μm, so ordinary mechanical filtration basically has no effect, and the filtration efficiency of high-precision filter cloth centrifuge is too low;

Method used

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  • Device and method of continuously separating solid-liquid phases in caprolactam distilled heavy residual liquid

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Embodiment 1

[0031] Such as figure 1 As shown, the present invention relates to a device for continuous solid-liquid phase separation in the heavy raffinate of caprolactam distillation, comprising a settler 1, one side of which is provided with a feed port 11, the other side is provided with an overflow port 12, and the bottom is provided with a The slag discharge port 13; the overflow port is connected to the clarified liquid intermediate tank 2, and the slag discharge port 13 is connected to the residue clarified tank 3; the clarified liquid intermediate tank 2 is connected to the caprolactam process 4 through pipelines and pumps, and the clarified liquid intermediate tank 2 is also connected to caprolactam Process water piping 5.

[0032] Further, the feed inlet 11 is connected to the caprolactam distillation heavy raffinate pipeline 6, a valve is installed near the feed inlet, and a branch pipe 7 is arranged between the caprolactam distillation heavy raffinate pipeline 6 and the valve,...

Embodiment 2

[0039] Embodiment 2: Use the above-mentioned device to separate the solid-liquid of the heavy residue of caprolactam distillation, control the evaporation of the caprolactam distillation tower, and make the flow rate of the heavy residue of distillation reach 1.5m 3 / h, analyze that its solid content is 0.8~1.2%wt, first introduce the heavy raffinate into the settler for sedimentation, control the temperature in the settler at 70~75°C, and the clear night after sedimentation enters the clarified liquid through the overflow port Further settle in the intermediate tank, and at the same time pass the process water in the caprolactam process water pipeline into the clarified liquid intermediate tank to dilute the clear night, and then transport the liquid in the clarified liquid intermediate tank to the caprolactam process.

[0040] During the operation, the volume ratio of the process water and the clear liquid in the middle tank of the clarified liquid is 1~5:1, so that the conce...

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Abstract

The invention discloses a device and a method of continuously separating solid-liquid phases in a caprolactam distilled heavy residual liquid. The device comprises a settler. A feed inlet is formed in one side of the settler while an overflow port is formed in the other side, and a slagging port is formed in bottom; the overflow port is connected to a clear liquor middle tank, and the slagging port is connected to a residual clear liquor tank; and the clear liquor middle tank is connected to a caprolactam step through a pipeline and a pump, and the clear liquor middle tank is connected to a caprolactam process water pipeline. By using caprolactam process water to clean and dilute the clear liquor and residues, continuous separation of caprolactam and low polymers in the caprolactam distilled heavy residual liquid and cyclic utilization of the caprolactam process water are realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to the production of caprolactam, in particular to a device and method for continuous separation of solid and liquid phases in the heavy raffinate of caprolactam distillation. Background technique [0002] The caprolactam distillation process is the last step in caprolactam refining. In the distillation process, high vacuum operation is used to reduce the boiling point of caprolactam, which can avoid the polycondensation of caprolactam by high heat. At the same time, alkali is added to the distillation feed liquid to neutralize a small amount of organic acid that may exist to form stable salts, so that it can be separated from caprolactam in distillation. , reduce the volatile alkali content of the product. However, local overheating inevitably exists in the heater tubes heated by steam, and the existence of caustic soda and moisture that are conducive to the polymerizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/02
CPCB01D21/0033B01D21/0045B01D21/009B01D21/02
Inventor 周学军王海军
Owner HUBEI SANNING CHEM
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