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Method and device for recycling polymerization liquid in carbon fiber production

A technology of recycling and polymerizing liquid, which is applied in the fields of rayon recycling, fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as fluctuations in supply volume and quality, large equipment investment, unqualified neutralization degree, etc., and achieve unqualified The effect of zero output of qualified products

Active Publication Date: 2021-12-03
山东永成新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the device mainly has the following problems: (1) the device is mainly aimed at the unqualified spinning solution caused by impurities, gels and air bubbles, and the waste spinning solution is more complicated, and the device lacks key indicators such as viscosity, Treatment measures for unqualified solid content and ammonia neutralization degree; (2) The device is an independent device, and the investment in equipment is large, and the waste spinning solution is sent to spinning through the delivery pump after being disposed of by the device, which may easily cause the amount of feed and quality fluctuations

Method used

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  • Method and device for recycling polymerization liquid in carbon fiber production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] as attached figure 1 As shown, the polymerization liquid recovery treatment device in carbon fiber production provided by the present invention includes a polymerization liquid recovery pump 19, a first static mixer 5, a single tower feed pump 2, a single tower 9, a concentration tower 10 and other equipment. Rotary viscometer 14, automatic adjustment valve, DCS control system and other instruments.

[0022] The polymer liquid recovery pump 19, the feed pump 2 of the de-single tower, and the discharge pump 11 of the concentration tower are imported gear pumps. The single-rotation volume of the gear pump is fixed. When blending, adjust the speed of the gear pump for accurate metering and blending.

[0023] The two strands of polymerization liquid enter the first static mixer 5 at the same time, and enter the second static mixer 12 at the same time after being treated with ammonia. The two static mixers are of SH type. The mixer is composed of double channels, and spiral ...

Embodiment 2

[0036] The polymerization liquid recovery and treatment system in the monomer recovery tower in the production of carbon fiber precursors provided in this example is the same as that in Example 1, and the method of using this system to recover the polymerization liquid is as follows:

[0037] The polymerization unit is in the maintenance and start-up stage, with an output of 40m 3 The unqualified polymerization liquid with an ammonia neutralization degree of 0.6 is stored in the recycled polymerization liquid tank 18, assuming that the ammonia neutralization degree control index of the polymerization liquid product is 0.8±0.05.

[0038] 1. Polymerization liquid feed; 2. Feed pump for de-single tower; 3. Frequency conversion controller of feed pump; 4. Sampling point for de-single feed; 5. First static mixer; 6. Inside the first static mixer 7. Single-off feed pressure detection point; 8. Single-off feed pressure regulating valve; 9. Single-off tower; 10. Concentration tower; 11....

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Abstract

The invention relates to a method and a device for recycling a polymerization liquid in carbon fiber production. The method and the device solve the technical problems in the prior art. The device is provided with a demonomerization tower feeding pump; a first static mixer; a demonomerization tower; a concentration tower; a concentration tower discharge pump; a second static mixer; a polymerization liquid product tank; a polymerization liquid recycling tank; a polymerization liquid recycling pump; a recycled polymerization liquid filter; and an ammonification facility. The polymerization liquid recycling tank collects unqualified polymerization liquid, the unqualified polymerization liquid passes through a polymerization liquid recycling pump outlet pipeline and the recycled polymerization liquid filter and then is mixed with qualified polymerization liquid at an outlet of the demonomerization tower feeding pump, and the mixture enters the first static mixer for preliminary mixing, then enters the demonomerization tower and the concentration tower, is subjected to impurity removal and defoaming and then is sent out by the concentration tower discharge pump; and after further ammoniation, the mixture enters the second static mixer, and the qualified polymerization liquid is sent to the polymerization liquid product tank after detection. The invention also provides the method for recycling the polymerization liquid in carbon fiber production. The invention can be used in the field of carbon fiber production.

Description

technical field [0001] The invention relates to a method and device for producing carbon fiber, in particular to a method and device for recycling and treating polymerization liquid in carbon fiber production. Background technique [0002] Polymerization is an important part of the production of carbon fiber precursors. In the production process of polyacrylonitrile (PAN)-based carbon fibers, acrylonitrile (AN) is used as the polymerization monomer and dimethyl sulfoxide (DMSO) is used as the solvent. In the case of starting and stopping of carbon fiber precursors, adjustment of polymerization formula and unexpected abnormalities, unqualified polymerization liquid will be produced. If it is not recycled, it will not only cause waste of polymerization liquid, but also increase the cost of solid waste treatment. If it is not handled properly, it will increase the cost of sewage treatment to the sewage treatment device, so the unqualified polymer solution will be recycled in th...

Claims

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Application Information

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IPC IPC(8): D01F13/00
CPCD01F13/00Y02P70/62
Inventor 沈传石张立坚赵彦国刘运波周占发宋立志齐志军时英勇张伟杨昆陈志敏孙毅刘根房
Owner 山东永成新材料有限公司
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