CN112342646A - Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes - Google Patents
Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes Download PDFInfo
- Publication number
- CN112342646A CN112342646A CN201910719836.XA CN201910719836A CN112342646A CN 112342646 A CN112342646 A CN 112342646A CN 201910719836 A CN201910719836 A CN 201910719836A CN 112342646 A CN112342646 A CN 112342646A
- Authority
- CN
- China
- Prior art keywords
- solvent
- carrier gas
- drying
- heat exchanger
- recycling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/04—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of synthetic polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fibers, which comprises the steps of washing tail gas containing a second solvent from a drying box and an extraction tank by using a proper solvent, sending the washed tail gas to a first heat exchanger, carrying out heat exchange, dividing the tail gas into two parts, feeding the first part into a carrier gas heater, enabling the temperature to reach a process index, and feeding the first part into the drying box for drying again; the second part of tail gas is subjected to advanced treatment; the carrier gas passes through the first heat exchanger from the drying box to transfer part of energy to tail gas from the washing tower, and simultaneously part of the second solvent is cooled and recovered; then, the carrier gas is further cooled by a second heat exchanger, and part of the second solvent is recycled again; and finally, the carrier gas containing a small amount of the second solvent passes through the washing tower and returns to the first heat exchanger for recycling. The invention can greatly recover the extracting agent in the extraction process and can greatly reduce the drying energy consumption in the drying stage after extraction.
Description
Technical Field
The invention relates to a carrier gas circulation and solvent recovery method in the processes of high-strength high-modulus polyethylene fiber extraction and drying.
Background
The high-strength high-modulus polyethylene fiber is a third-generation high-performance fiber which appears after carbon fiber and aramid fiber, and is widely applied to navigation, aviation, aerospace, defense equipment and modernized wars due to the excellent performances of high strength, high modulus, light weight, wear resistance, low temperature resistance, ultraviolet resistance, shielding resistance, good flexibility, high impact energy absorption, strong acid and strong base chemical corrosion resistance and the like.
At present, gel spinning, high-power hot drawing process, which is divided into dry process and wet process, is adopted for the industrial production of polyethylene fibers. Except dry processes are used by DSM, japan, eastern ocean spinning, etc., wet processes are used by other companies.
The wet process comprises four procedures of spinning solution preparation, gel strand silk drawing, extraction drying and stretching and shaping. The nascent fiber prepared by gel spinning is a highly swollen gel, and contains a large amount of high-boiling-point solvent to solvate macromolecular chains, so that the valence bond force between chains and the entanglement point density are reduced. Solvation reduces the relaxation activation energy of the macromolecular chains, increases mobility, and allows relative slippage when subjected to tension, especially when drawn at high temperatures, reducing the strength and modulus of the fiber, so that the solvent must be removed.
At present, the extraction method is generally adopted to remove the solvent with high boiling point in gel strand, multi-stage extraction is usually adopted to improve the extraction efficiency, the extraction and recovery cost is high, and the extractant is mostly volatile substances with low boiling point, so that the problems of safety and environmental protection are easily caused. Drying is required to remove the extractant remaining in the gel strands. The polyethylene strips are conveyed into the drying chamber by the conveyor belt, so that local heating of the strips on the contact surface of the strips and the iron net is too large and the strips are heated unevenly during hot air drying, so that the mechanical property of the finished strips is unstable.
In CN100427653C, hydrocarbon is used as an extracting agent, and gel filaments are subjected to bundling tension frame, filament separating frame, pressure oil roller, hydrocarbon liquid pretreatment bath tank, seven-roller traction roller, ultrasonic hydrocarbon extraction tank, hot air drying, multi-stage stretching and winding to obtain the high-strength high-modulus polyethylene fibers, wherein the solvent content is 1.2-1.8%. The process flow is longer, the ultrasonic extraction greatly accelerates the extraction speed, but also accelerates the volatilization of the extracting agent, thereby increasing the fiber cost and deteriorating the environment.
CN1912198A discloses a drawing extraction method in the preparation process of ultra-high molecular weight polyethylene fiber. The drafting operation is carried out simultaneously in the extraction process, so that the surface of the fiber can be promoted to be updated, the possible skin layer is eliminated, and the extraction speed is accelerated; due to the existence of the drafting stress, the cavity appeared after the solvent is separated from the nascent fiber is closed, so that the fiber structure is more compact. In order to obtain a proper drawing ratio, the proper drawing ratio needs to be distributed among the extraction tanks, which increases the operation difficulty, and the number of godets and motors needs to be increased, thereby increasing the equipment investment.
CN1693545A discloses a supercritical extraction and drying method in the preparation of ultra-high molecular weight polyethylene fiber. The method selects one of methane, ethane, propane, ethylene and propylene as an extracting agent, and the extraction and the drying are completed in the same equipment, so that the process is simplified, but the supercritical extraction needs high temperature and high pressure, the requirement on the equipment is high, and the safety is greatly reduced.
CN102115964B proposes a drying method of ultra-high molecular weight polyethylene fiber, which performs three-stage drying on the filament, and changes the blowing direction of hot air, so that the filament is heated uniformly, and the mechanical properties of the filament are stabilized. Because of the adoption of three-stage drying, the investment on equipment is increased, and because of the heat conductivity of the iron net, the strand silk cannot be heated uniformly completely, and the phenomena of broken silk and broken ends are easy to occur during the super-drawing.
Many researchers have studied methods and apparatuses for improving extraction efficiency and effect, and the study on drying is only to solve the problem of drying effect and efficiency. The application of the research results really achieves the original research purpose and solves some problems. However, for the extraction and drying in the production process of PE fiber, no research has been made on methods and devices for improving the recovery rate of the extractant during the drying process and for saving energy during the drying process, and no research has been made on the two methods together.
The hot box is actually hot air used to dry the tetrachloroethylene on the surface of the fibers and the inventors have designed to wash the second solvent in the carrier gas with a suitable solvent in order to recover the energy in the carrier gas while reducing emissions. Suitable solvents include white oil, dioctyl phthalate, water, and the like. In consideration of the separation of the second solvent after washing, it is most reasonable to select the white oil, and the mixed solution after absorbing the second solvent can be treated together with the extract. The first solvent, namely the white oil, washes the tail gas containing the second solvent from the drying box, the washed tail gas is divided into two parts, the first part is sent to the first heat exchanger, is heated and then enters the carrier gas heater, the temperature reaches the process index, and the tail gas enters the hot box and is used for drying again. The carrier gas from the hot box also passes through the first heat exchanger to transfer part of energy to part of tail gas from the washing tower, so that the surplus energy brought from the hot box can be recovered, and part of the second solvent can be cooled and recovered at the same time. Then, the carrier gas is further cooled by the second heat exchanger, and part of the second solvent is recovered again. And finally, pressurizing carrier gas containing a small amount of second solvent by a fan, passing through a washing tower, and returning part of the carrier gas to the first heat exchanger for recycling. And the second part of tail gas after washing is subjected to advanced treatment.
Disclosure of Invention
The invention aims to provide a carrier gas circulation and solvent recovery method in the processes of extraction and drying of high-strength high-modulus polyethylene fibers, which can greatly recover an extracting agent in the extraction process and greatly reduce drying energy consumption in the drying stage after extraction.
The technical solution of the invention is as follows:
a carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fibers is characterized in that: washing tail gas containing a second solvent from the drying box and the extraction tank by using a proper solvent, sending the washed tail gas to a first heat exchanger, carrying out heat exchange, dividing the tail gas into two parts, sending the first part into a carrier gas heater, enabling the temperature to reach a process index, and sending the first part into the drying box for drying again; the second part of tail gas is subjected to advanced treatment; the carrier gas passes through the first heat exchanger from the drying box to transfer part of energy to tail gas from the washing tower, and simultaneously part of the second solvent is cooled and recovered; then, the carrier gas is further cooled by a second heat exchanger, and part of the second solvent is recycled again; and finally, the carrier gas containing a small amount of the second solvent passes through the washing tower and returns to the first heat exchanger for recycling.
The suitable solvent is one or a combination of white oil, dioctyl phthalate and water.
The first heat exchanger is one or a combination of a surface cooler, a heat pipe heat exchanger, a tube heat exchanger, a spiral tube heat exchanger and a plate heat exchanger.
The second heat exchanger is one or a combination of a plurality of surface type coolers, heat pipe heat exchangers, tube heat exchangers, spiral tube heat exchangers and plate heat exchangers.
And the second part of tail gas subjected to advanced treatment is treated by adopting one or more process combinations of resin adsorption, desorption and recovery, activated carbon adsorption, desorption and recovery, washing of a washing tower, activated carbon fiber adsorption and desorption, burning of an RTO furnace, photocatalysis and plasma catalysis.
The booster fan is made of glass fiber reinforced plastic.
The washing tower is a packed tower or a plate tower.
The invention can greatly recover the extracting agent in the extraction process and can greatly reduce the drying energy consumption in the drying stage after extraction.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic process flow diagram of one embodiment of the present invention.
Detailed Description
A carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fibers is characterized in that tail gas containing a second solvent and discharged from a drying box and an extraction tank is washed by a proper solvent, the washed tail gas enters a first heat exchanger 1, is subjected to heat exchange and then is divided into two parts, the first part enters a carrier gas heater 2, the temperature reaches a process index, and the first part enters a drying box 3 for drying again; the second part of tail gas is subjected to advanced treatment; the carrier gas passes through the first heat exchanger from the drying box to transfer part of energy to tail gas from the washing tower, and simultaneously part of the second solvent is cooled and recovered; then, the carrier gas is further cooled by a second heat exchanger 4, and part of the second solvent is recycled again; finally, the carrier gas containing a small amount of the second solvent passes through the washing tower 5 and returns to the first heat exchanger for recycling.
The suitable solvent is one or a combination of white oil, dioctyl phthalate and water.
The first heat exchanger is one or a combination of a surface cooler, a heat pipe heat exchanger, a tube heat exchanger, a spiral tube heat exchanger and a plate heat exchanger.
The second heat exchanger is one or a combination of a plurality of surface type coolers, heat pipe heat exchangers, tube heat exchangers, spiral tube heat exchangers and plate heat exchangers.
And the second part of tail gas subjected to advanced treatment is treated by adopting one or more process combinations of resin adsorption, desorption and recovery, activated carbon adsorption, desorption and recovery, washing of a washing tower, activated carbon fiber adsorption and desorption, burning of an RTO furnace, photocatalysis and plasma catalysis.
The booster fan is made of glass fiber reinforced plastic. The washing tower is a packed tower or a plate tower.
The figure also comprises a fan 6, a white oil storage tank 7 and a circulating pump 8.
Claims (7)
1. A carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fibers is characterized in that: washing tail gas containing a second solvent from the drying box and the extraction tank by using a proper solvent, sending the washed tail gas to a first heat exchanger, carrying out heat exchange, dividing the tail gas into two parts, sending the first part into a carrier gas heater, enabling the temperature to reach a process index, and sending the first part into the drying box for drying again; the second part of tail gas is subjected to advanced treatment; the carrier gas passes through the first heat exchanger from the drying box to transfer part of energy to tail gas from the washing tower, and simultaneously part of the second solvent is cooled and recovered; then, the carrier gas is further cooled by a second heat exchanger, and part of the second solvent is recycled again; and finally, the carrier gas containing a small amount of the second solvent passes through the washing tower and returns to the first heat exchanger for recycling.
2. The carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, which is characterized in that: the suitable solvent is one or a combination of white oil, dioctyl phthalate and water.
3. The carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, which is characterized in that: the first heat exchanger is one or a combination of a surface cooler, a heat pipe heat exchanger, a tube heat exchanger, a spiral tube heat exchanger and a plate heat exchanger.
4. The carrier gas circulation and solvent recovery method in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, which is characterized in that: the second heat exchanger is one or a combination of a plurality of surface type coolers, heat pipe heat exchangers, tube heat exchangers, spiral tube heat exchangers and plate heat exchangers.
5. The method for recycling carrier gas and solvent in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, 2, 3 or 4, wherein the carrier gas recycling and solvent recycling method comprises the following steps: and the second part of tail gas subjected to advanced treatment is treated by adopting one or more process combinations of resin adsorption, desorption and recovery, activated carbon adsorption, desorption and recovery, washing of a washing tower, activated carbon fiber adsorption and desorption, burning of an RTO furnace, photocatalysis and plasma catalysis.
6. The method for recycling carrier gas and solvent in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, 2, 3 or 4, wherein the carrier gas recycling and solvent recycling method comprises the following steps: the booster fan is made of glass fiber reinforced plastic.
7. The method for recycling carrier gas and solvent in the process of extracting and drying high-strength high-modulus polyethylene fiber as claimed in claim 1, 2, 3 or 4, wherein the carrier gas recycling and solvent recycling method comprises the following steps: the washing tower is a packed tower or a plate tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910719836.XA CN112342646A (en) | 2019-08-06 | 2019-08-06 | Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910719836.XA CN112342646A (en) | 2019-08-06 | 2019-08-06 | Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112342646A true CN112342646A (en) | 2021-02-09 |
Family
ID=74366354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910719836.XA Pending CN112342646A (en) | 2019-08-06 | 2019-08-06 | Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112342646A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5230854A (en) * | 1991-12-09 | 1993-07-27 | Allied-Signal Inc. | Method for removal of spinning solvent from spun fiber |
| CN101012577A (en) * | 2007-02-09 | 2007-08-08 | 北京特斯顿新材料技术发展有限公司 | Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight |
| CN101984155A (en) * | 2010-10-11 | 2011-03-09 | 浙江千禧龙特种纤维有限公司 | Method for drying ultra-high molecular weight polyethylene fibers |
| CN104560121A (en) * | 2013-10-10 | 2015-04-29 | 天华化工机械及自动化研究设计院有限公司 | Method and device for recovering extractant in coal-based oil dreg extraction residue |
| CN104848655A (en) * | 2015-06-02 | 2015-08-19 | 天华化工机械及自动化研究设计院有限公司 | Method for drying closed circulation fluidized beds by aid of nitrogen and polyethylene with ultrahigh molecular weight |
| US20180282904A1 (en) * | 2014-12-02 | 2018-10-04 | Braskem America, Inc. | Continuous method and system for the production of at least one polymeric yarn and polymeric yarn |
-
2019
- 2019-08-06 CN CN201910719836.XA patent/CN112342646A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5230854A (en) * | 1991-12-09 | 1993-07-27 | Allied-Signal Inc. | Method for removal of spinning solvent from spun fiber |
| CN101012577A (en) * | 2007-02-09 | 2007-08-08 | 北京特斯顿新材料技术发展有限公司 | Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight |
| CN101984155A (en) * | 2010-10-11 | 2011-03-09 | 浙江千禧龙特种纤维有限公司 | Method for drying ultra-high molecular weight polyethylene fibers |
| CN104560121A (en) * | 2013-10-10 | 2015-04-29 | 天华化工机械及自动化研究设计院有限公司 | Method and device for recovering extractant in coal-based oil dreg extraction residue |
| US20180282904A1 (en) * | 2014-12-02 | 2018-10-04 | Braskem America, Inc. | Continuous method and system for the production of at least one polymeric yarn and polymeric yarn |
| CN104848655A (en) * | 2015-06-02 | 2015-08-19 | 天华化工机械及自动化研究设计院有限公司 | Method for drying closed circulation fluidized beds by aid of nitrogen and polyethylene with ultrahigh molecular weight |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017157180A1 (en) | Method of tyre rubber pyrolysis employing combined heating and microwaving and recycling pyrolysis gas | |
| CN101532244B (en) | Method for modifying ultrahigh molecular weight polyethylene fiber by plasma treatment | |
| CN101798720B (en) | Aramid fiber III on-line thermal treating process and device thereof | |
| EP2505697A1 (en) | Method for uniformly producing filament from ultra-high molecular weight polyethylene high-sheared solution | |
| CN105369587A (en) | Method for dyeing processed surface of ultra-high molecular weight polyethylene fiber | |
| CN106496631A (en) | The method that overcritical fluid-mixing reclaims carbon fiber enhancement resin base composite material | |
| CN111733465B (en) | High-strength polyethylene fiber melt spinning method and device | |
| CN104911722A (en) | Method for precursor fiber curing molding during ultrahigh-molecular-weight polyethylene dry spinning | |
| CN112342646A (en) | Carrier gas circulation and solvent recovery method in high-strength high-modulus polyethylene fiber extraction and drying processes | |
| CN101984155A (en) | Method for drying ultra-high molecular weight polyethylene fibers | |
| CN203514015U (en) | Device for tension processing polyamide fiber in supercritical CO2 | |
| CN110565415A (en) | Supercritical carbon dioxide printing and dyeing process and printing and dyeing system thereof | |
| CN107034533A (en) | A kind of manufacturing technique method of polyester FDY multi roll oil-free fully-drawn fibers | |
| CN102517694B (en) | Post-spinning treatment process for ultra-high molecular weight polyethylene fiber yarn using methylene dichloride as extracting agent | |
| CN102953186B (en) | A kind of superhigh molecular weight polyethylene fibers dyeing apparatus and method thereof | |
| CN102995210A (en) | Post-processing device and method for aramid fiber filaments | |
| CN103046403B (en) | Method for preparing colored UHMW (ultra-high molecular weight) polyethylene fibers | |
| CN103786278B (en) | The preparation method of continuous long glass fiber REINFORCED PET and equipment thereof | |
| CN201190199Y (en) | Extractor for producing polyethylene fiber and multi-stage extractor | |
| CN105061133A (en) | Method and device for recycling acetylene during production process of vinyl acetate | |
| CN215975929U (en) | Oil quenching tempering spring steel wire quality improvement device | |
| CN201224784Y (en) | Apparatus for removing dissolvent in polyethylene fiber | |
| CN110205711A (en) | A kind of preparation method of vapor phase method extraction high-strength high-modulus polyethylene gel spun fiber | |
| CN217188703U (en) | Recovery processing device for tail gas containing volatile solvent in gel silk solvent removing process | |
| CN108673787A (en) | A kind of recovery method of fibre reinforced composites sucker rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230406 Address after: 226400 No.26 Xianghai Avenue, Yangkou Town, Rudong County, Nantong, Jiangsu Applicant after: Kyushu Star Technology Co.,Ltd. Address before: 226407 No.12, Huanghai 3rd road, Rudong Coastal Economic Development Zone, Nantong City, Jiangsu Province Applicant before: JIANGSU JIUJIUJIU TECHNOLOGY Co.,Ltd. |
|
| TA01 | Transfer of patent application right |