CN105738601A - On-line detection method of oxygen content of high-performance polyethylene fiber prepared through dry spinning - Google Patents
On-line detection method of oxygen content of high-performance polyethylene fiber prepared through dry spinning Download PDFInfo
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- CN105738601A CN105738601A CN201410755714.3A CN201410755714A CN105738601A CN 105738601 A CN105738601 A CN 105738601A CN 201410755714 A CN201410755714 A CN 201410755714A CN 105738601 A CN105738601 A CN 105738601A
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Abstract
The invention discloses an on-line analysis and detection method of an oxygen content of a high-performance polyethylene fiber prepared through dry spinning. During a process of preparing the high-performance polyethylene fiber prepared through dry spinning, in an enclosed container, a decahydronaphthalene solution is adopted to dissolve ultra-high-molecular-weight polyethylene powder; gas above the dissolved liquid in the enclosed container is sampled, is subjected to filtration and adsorption, and is finally sent to an on-line oxygen-content analyzer for oxygen content detection. During oxygen content detection, a solenoid valve SV1 controls sampling, and a filter is subjected to back-blowing through adoption of a compressed-nitrogen back-blowing pipe through a solenoid valve SV2, thereby avoiding waste of resources. According to the method, entrainment and ultra-high-molecular-weight polyethylene powder in an organic solvent can be effectively removed from gas, thereby preventing damage to the on-line oxygen-content analyzer, and keeping the analyzer normally operating. An oxygen content in the high-performance polyethylene fiber can be quickly and accurately analyzed and detected on line, so that the work efficiency is ensured. Besides, nitrogen back-flowing circulation is utilized for recycling and saving resources.
Description
Technical field
The present invention relates to polyethylene fibre oxygen analysis detection field, particularly a kind of online oxygen content detection method of high-performance polyethylene fibres dry spinning.
Background technology
High-performance polyethylene fibres, also known as high strength and modulus polyethylene fibre, has the characteristics such as high intensity, high-modulus, high-orientation.Existing high-performance polyethylene fibres of preparing mainly has dry spinning method and wet spinning process, both main distinctions are to adopt different solvents and subsequent technique, dry spinning is relative to wet spinning, in dry spinning production technology, solvent is less, powerful high, and anti-compacted performance is good, it is used for high-end product, extract and hot-air dry flow process without pass through continuous multi-stage owing to dry spinning route adopting solvent directly reclaim, and speed of production is fast, thus improve production efficiency.
The technical process of current dry spinning is polymer first to carry out swelling dissolving then pass through dosing pump feeding, meet and discuss in ejection liquid stream entrance nitrogen stream via spray webbing, the pre-hot nitrogen of solvent in thread is pulled away, high polymer solidifies filamentation therewith, then through preliminary draft, high drafting, obtains high-performance polyethylene fibres；In dry-spinning process flow process, one of key technology being prepared by superhigh molecular weight polyethylene fibers spinning of homogeneous solution, due to homogeneous solution be prepared by carry out under lasting higher temperature environment, polyethylene is easy to thermal cracking and oxidative degradation, in order to reduce the oxidation rate of polymer, adopt in nitrogen bath, solvent and add the carrying out that antioxidant can suppress thermal oxidative degradation to react effectively, so high-performance polyethylene fibres oxygen content when producing is detected and controls just very necessary.
High-performance polyethylene fibres needs to detect its oxygen content to guarantee that oxygen content is in prescribed limit when producing.When its oxygen content being carried out on-line checking in producing high-performance polyethylene fibres process, easily occur in organic solvent course of conveying is formed in pipeline and assemble, cause the detection of online oxygen content malfunctioning.Research and develop a kind of quickly, can extend the life-span of online oxygen conten analyser, the high-performance polyethylene fibres dry spinning online oxygen analysis detection method that detects of reduction environmental pollution becomes the technical problem that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
The technical problem to be solved is, the shortcoming overcoming prior art, a kind of online oxygen analysis detection method of high-performance polyethylene fibres dry spinning is provided, this online oxygen analysis detection method can effectively remove the polyethylene powders of mist that organic solvent in gas carries secretly and high molecular, reduce the injury to online oxygen conten analyser, keep the properly functioning of online oxygen analysis detection equipment, quickly accurate online when high-performance polyethylene fibres produces can analyze the oxygen content detecting in high-performance polyethylene fibres, it is ensured that work efficiency；The back suction circulation recycling also using nitrogen economizes on resources.
In order to solve above technical problem, the present invention provides a kind of online oxygen analysis detection method of high-performance polyethylene fibres dry spinning, specifically includes following steps:
(1) with the polyethylene powders of high molecular for raw material, with decahydronaphthalene for solvent, with solvent, the polyethylene powders of high molecular being carried out swelling dissolving in hermetic container in high temperature environments and prepare homogeneous solution, above hermetic container, the gas above homogeneous solution is connected in other adapter road；
(2) gas collection pump, filter, electromagnetic valve SV1, adsorption box and online oxygen conten analyser are installed on the other adapter road draw homogeneous solution overhead gas successively, the pipeline between filter and electromagnetic valve SV1 connect a bypass line and is connected with nitrogen anti-blowpipe by electromagnetic valve SV2；
In hermetic container except nitrogen necessary to technique and the air that penetrates into owing to system is in tiny structure, the polyethylene powders carried secretly and solvent is also had to eventually enter into online oxygen content analyzer by gas collection pump through piping, and real-time by testing result now on the display of online oxygen conten analyser, online oxygen content analyzer is connected with the computer of remote monitoring room by electric wire, the data of detection is sent on computer；
(3) electromagnetic valve SV2 it is first shut off, open electromagnetic valve SV1 to sample, by the gas of the polyethylene powders being mixed with high molecular in technique under gas collection pumping action, online oxygen content analyzer real-time testing result being apparent on the display of online oxygen conten analyser is eventually entered into by filter, electromagnetic valve SV1 and adsorption box；
(4) closing electromagnetic valve SV1, open electromagnetic valve SV2, with compressed nitrogen anti-blowpipe, filter is carried out blowback, the nitrogen pressure in compressed nitrogen anti-blowpipe is 0.7-0.9MP.
The present invention it is preferred that technical scheme be:
In the online oxygen analysis detection method of aforementioned high-performance polyethylene fibres dry spinning, the filter element adopted in filter is 7 μm of filter elements.
Present invention uses the filter of 7 μm of filter elements can effectively stop polyethylene powders to enter oxygen conten analyser, it is possible to be greatly improved the service life of oxygen conten analyser.
In the online oxygen analysis detection method of aforementioned high-performance polyethylene fibres dry spinning, adsorbent used in adsorption box is activated carbon, silica type adsorbent, it is preferable that activated carbon class adsorbent.
The mode adopting activated carbon adsorption solves organic solvent entrainment in gas, it is prevented that the online oxygen analysis test caused due to pipeline hydrops is malfunctioning, extends the service life of online oxygen conten analyser；Adsorbent used is that activated carbon class adsorbent can use by circular regeneration, this not only lowers use cost, can also reduce environmental pollution simultaneously.
In the online oxygen analysis detection method of aforementioned high-performance polyethylene fibres dry spinning, nitrogen anti-blowpipe adopts time-devision system, blowback and sampling hocket, i.e. every 20min blowback 1s, the nitrogen of the polyethylene powders 0.7-0.9MPa namely filter inner chamber accumulated in 20min sampling period blows back hermetic container in 1s.
In the online oxygen analysis detection method of aforementioned high-performance polyethylene fibres dry spinning, online oxygen content analyzer is zirconia oxygen analyzer；Zirconium oxide formula oxygen divides the degree of accuracy that instrument checks oxygen content high, and susceptiveness is good.
The invention has the beneficial effects as follows:
The present invention is the processing mode of online oxygen content analysis detection suitable in some industrial enterprise, it is particularly well-suited to the online oxygen content analysis of high-performance polyethylene fibres dry spinning, the mode adopting activated carbon adsorption solves organic solvent entrainment in gas, prevent the online oxygen analysis test caused due to pipeline hydrops malfunctioning, extend the service life of online oxygen conten analyser.
Have employed the method for blowback nitrogen in the present invention and solve the frequent blocked problem of system, adopt nitrogen backblowing can greatly reduce operator and be replaced as frequently as filter element, this has not only saved material, it is often more important that decrease environmental pollution.
What the present invention adopted is the Guan Bi of electromagnetic valve control switch, and this not only greatly reduces the labor intensity of operator, also improves work efficiency.
In the nitrogen blowback system that the present invention adopts, within the blowback time of 1s, carry out owing to closing SV1 and unlatching SV2 simultaneously, therefore the nitrogen of 0.7MPa is blown in hermetic container only by filter, without blowing into nutrient analyzer, so, the oxygen amount detection agency of instrument is not resulted in harmful effect by blowback nitrogen, simultaneously, the polyethylene powders of the high molecular filtered down by filter can also be blown back in hermetic container to react again, having saved resource, resource is fully utilized, and reduces cost.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the online oxygen analysis detection method embodiment of high-performance polyethylene fibres dry spinning of the present invention.
Detailed description of the invention
Embodiment 1
The online oxygen analysis detection method of a kind of high-performance polyethylene fibres dry spinning that the present embodiment provides, schematic flow sheet is as it is shown in figure 1, specifically include following steps:
(1) dry spinning method is adopted to prepare high-performance polyethylene fibres, with the polyethylene powders of high molecular for raw material, with decahydronaphthalene for solvent, in high temperature environments the polyethylene powders of high molecular is carried out swelling dissolving with solvent by hermetic container to prepare homogeneous solution and then carry out subsequent technique and finally give high-performance polyethylene fibres, gas above other adapter road connection homogeneous solution above hermetic container；
(2) on the other adapter road drawing homogeneous solution overhead gas, gas collection pump is sequentially installed, filter element be 7 μm filter, electromagnetic valve SV1, in have adsorption box and the on-line oxidation zirconium oxygen analyzer of activated carbon class adsorbent, the pipeline between filter and electromagnetic valve SV1 connects a bypass line and passes through electromagnetic valve SV2 and be connected with nitrogen anti-blowpipe；
In hermetic container except nitrogen necessary to technique and the air that penetrates into owing to system is in tiny structure, also have the polyethylene powders carried secretly and solvent to eventually enter into online oxygen content analyzer by gas collection pump through piping, and real-time by testing result now on the display of online oxygen conten analyser；
(3) electromagnetic valve SV2 it is first shut off, open electromagnetic valve SV1 to sample, by the gas of the polyethylene powders being mixed with high molecular in technique under gas collection pumping action, on-line oxidation zirconium oxygen analyzer real-time testing result being apparent on the display of online oxygen conten analyser is eventually entered into by filter, electromagnetic valve SV1 and adsorption box；
(4) closing electromagnetic valve SV1, open electromagnetic valve SV2, with compressed nitrogen anti-blowpipe, filter is carried out blowback, the nitrogen pressure in compressed nitrogen anti-blowpipe is 0.7-2.0MPa；
Adopting time-devision system in nitrogen anti-blowpipe, blowback and sampling hocket, i.e. every 20min blowback 1s, and the nitrogen of the polyethylene powders 0.7-0.9MPa namely filter inner chamber accumulated in 20min sampling period blows back hermetic container in 1s, then reacts.
Oxygen content is detected by the method using the present invention when using dry spinning to prepare high-performance polyethylene fibres, the polyethylene powders that can effectively remove mist that organic solvent in gas carries secretly and high molecular reduces the injury to online oxygen conten analyser, keep the properly functioning of online oxygen analysis detection equipment, quickly accurate online when high-performance polyethylene fibres produces can analyze the oxygen content detecting in high-performance polyethylene fibres, it is ensured that work efficiency；The back suction circulation recycling also using nitrogen economizes on resources.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to replacement or the technical scheme of equivalent transformation formation, all fall within the protection domain of application claims.
Claims (8)
1. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning, it is characterised in that comprise the following steps:
(1) with the polyethylene powders of super high molecular weight for raw material, with decahydronaphthalene for solvent, with solvent, the polyethylene powders of high molecular being carried out swelling dissolving in hermetic container in high temperature environments and prepare homogeneous solution, above hermetic container, the gas above homogeneous solution is connected in other adapter road；
(2) gas collection pump, filter, electromagnetic valve SV1, adsorption box and online oxygen conten analyser are sequentially installed on the other adapter road draw homogeneous solution overhead gas, the pipeline between filter and electromagnetic valve SV1 connect a bypass line and is connected with nitrogen anti-blowpipe by electromagnetic valve SV2；
(3) electromagnetic valve SV2 it is first shut off, open electromagnetic valve SV1 to sample, by the gas of the polyethylene powders being mixed with high molecular in technique under gas collection pumping action, online oxygen content analyzer real-time testing result being apparent on the display of online oxygen conten analyser is eventually entered into by filter, electromagnetic valve SV1 and adsorption box；
(4) closing electromagnetic valve SV1, open electromagnetic valve SV2, with compressed nitrogen anti-blowpipe, filter is carried out blowback, the described nitrogen pressure in compressed nitrogen anti-blowpipe is 0.7-2.0MP.
2. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 1, it is characterised in that: the filter element adopted in described filter is 4-12 μm of filter element.
3. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 2, it is characterised in that: the filter element adopted in described filter is 7 μm of filter elements.
4. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 1, it is characterised in that: adsorbent used in described adsorption box is activated carbon, silica type adsorbent.
5. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 4, it is characterised in that: adsorbent used in described adsorption box is activated carbon class adsorbent.
6. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 1, it is characterised in that: adopting time-devision system in described nitrogen anti-blowpipe, blowback and sampling hocket.
7. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 6, it is characterized in that: every 20min blowback 1s in described nitrogen anti-blowpipe, the nitrogen of the polyethylene powders 0.7-0.9MPa namely filter inner chamber accumulated in 20min sampling period blows back hermetic container in 1s.
8. the online oxygen analysis detection method of high-performance polyethylene fibres dry spinning according to claim 1, it is characterised in that；Described online oxygen content analyzer is zirconia oxygen analyzer.
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Cited By (2)
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| CN106198888A (en) * | 2016-08-16 | 2016-12-07 | 北京京城环保股份有限公司 | A kind of zirconium oxide analysis of oxygen content combination unit and method |
| CN108707988A (en) * | 2018-06-01 | 2018-10-26 | 江西华圆机电有限公司 | A kind of rear spinning equipment producing high-performance fiber based on melt spinning process |
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Address after: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee after: China Petroleum & Chemical Corp. Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: China Petroleum & Chemical Corp. Patentee before: Nanhua Group Research Institute |