Dehydrating tower for recycling NMP waste liquid

A waste liquid recovery and dehydration tower technology, applied in the direction of fractionation, can solve the problems of insufficient NMP purity and low efficiency, and achieve the effect of efficient recovery

Inactive Publication Date: 2020-05-19
重庆中润新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a dehydration tower for recycling NMP waste liquid to solve the problem of insufficient purity and low efficiency of NMP obtained from the existing dehydration tower

Method used

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  • Dehydrating tower for recycling NMP waste liquid
  • Dehydrating tower for recycling NMP waste liquid
  • Dehydrating tower for recycling NMP waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 is basically as attached figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 Shown:

[0040] A dehydration tower for NMP waste liquid recovery, comprising a tower base 1, a tower kettle 2, a tower body 3 and a tower top 4 fixedly connected sequentially from bottom to top, wherein the tower base 1 is fixed on the ground by bolts, and the tower body 3 includes a lift Distillation section 31 and rectification section 32, wherein rectification section 32 is positioned at the top of stripping section 31, and the diameter of rectification section 32 is 0.65~0.7 times of the diameter of stripping section 31, and the diameter of stripping section 31 in the present embodiment The diameter of the rectifying section 32 is 0.7m. The stripping section 31 and the rectifying section 32 are connected with a conical section 33 with a narrow top and a wide bottom. The tower body 3 is formed by detachable connection of multiple cylinders 5 , that is, t...

Embodiment 2

[0048] Embodiment 2 is basically as attached Figure 8 Shown:

[0049] The difference from Embodiment 1 is that a flow guide structure is also provided on the inner wall of the tapered section 33, specifically, a plurality of flow guide bars 22 are vertically fixed on the inner wall of the tapered section 33, and a plurality of flow guide bars The strips 22 are uniformly distributed along the circumference of the tapered section 33 , and flow guide grooves 23 are formed between adjacent flow guide bars 22 . The formation of a plurality of diversion grooves 23 makes it possible for the liquid beads that may condense on the inner wall of the conical section 33 to flow down along the diversion grooves 23 during the working process of the dehydration tower, and then enter the stripping section 31 again and be absorbed by the high-temperature steam. It is vaporized under the action, and then the rectification is completed.

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Abstract

The invention relates to the technical field of chemical equipment. The dehydrating tower for recycling NMP waste liquid comprises a tower base, a tower kettle, a tower body and a tower top which arefixedly connected in sequence, the bottom of the tower kettle communicates with a discharge pipe; the side wall of the tower kettle communicates with a steam pipe; the tower top communicates with a gas outlet; a filler is arranged in tower body; the tower body comprises a rectifying section and a stripping section; the rectifying section is positioned above the stripping section; the diameter of the rectifying section is 0.65-0.7 time the diameter of the stripping section; a feeding pipe is arranged on the stripping section; a liquid distributor positioned in the tower body is arranged at thefeeding pipe; a return pipe is arranged at the upper part of the rectifying section; and a reflux distributor positioned in the tower body is arranged at the return pipe. By the adoption of such a technical scheme, separation requirements on the NMP waste liquid can be met, products meeting purity requirements can be obtained, equipment size can be optimized, and equipment investment can be reduced.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a dehydration tower for recycling NMP waste liquid. Background technique [0002] With the rapid development of the global economy, the exploitation of non-renewable resources such as oil and coal continues to increase, forcing people to look for new energy sources. Lithium batteries have been widely used in various fields due to their small size, high voltage, light weight, no memory effect, no pollution, high specific energy and long service life. In recent years, due to the rapid development of lithium batteries, N-methylpyrrolidone (NMP for short) has been widely used as an auxiliary material for positive electrodes. [0003] In lithium batteries, NMP is mainly used to dissolve PVDF to make structural materials such as electrodes and diaphragms; in the process of preparing lithium-ion batteries, NMP is often used as an excellent organic solvent for positive electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14
CPCB01D3/14
Inventor 丁龙奇刘玥彤郑会生
Owner 重庆中润新材料股份有限公司
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