CN102029077A - Technology and device for separating polyethylene from methylbenzene and recycling polyethylene and methylbenzene in preparation of superfine fibers - Google Patents
Technology and device for separating polyethylene from methylbenzene and recycling polyethylene and methylbenzene in preparation of superfine fibers Download PDFInfo
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- CN102029077A CN102029077A CN 201010535554 CN201010535554A CN102029077A CN 102029077 A CN102029077 A CN 102029077A CN 201010535554 CN201010535554 CN 201010535554 CN 201010535554 A CN201010535554 A CN 201010535554A CN 102029077 A CN102029077 A CN 102029077A
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Abstract
The invention relates to technology for separating polyethylene from methylbenzene and recycling the polyethylene and the methylbenzene in preparation of superfine fibers. The technology comprises the following steps of: (1) evaporating polyethylene-containing methylbenzene solution by a pre-evaporator till the methylbenzene accounts for less than 50 percent based on the weight of the polyethylene-containing methylbenzene solution; (2) evaporating by a first horizontal tube evaporator till the methylbenzene accounts for less than 15 percent based on the weight of the polyethylene-containing methylbenzene solution; (3) evaporating by a second tube evaporator till the methylbenzene accounts for less than 1 percent based on the weight of the polyethylene-containing methylbenzene solution; (4) condensing and recycling the methylbenzene vapors obtained in the steps (1), (2) and (3); and (5) pelletizing the polyethylene obtained in the step (3). The corresponding device for separating the polyethylene from the methylbenzene and recycling the polyethylene and the methylbenzene comprises the pre-evaporators, a condensing device, a polyethylene relay groove, the first horizontal tube evaporator, the second horizontal tube evaporator, a first gear pump, a second gear pump and a vacuum system. The processing capacity of equipment is about twice that of the prior art, and the equipment can operate continuously, so that the methylbenzene content in the polyethylene is reduced, the separation effect of the methylbenzene and the polyethylene is improved, and environmental pollution is reduced.
Description
Technical field
The present invention relates in the microfiber synthetic leather production technology of a kind of island the separation and recovery technology and the device of polyethylene and toluene in the superfine fibre preparation.
Background technology
In the production of microfiber synthetic leather, the sea-island fibre nonwoven that PE/PA6 (polyethylene/nylon 6) blend short fiber commonly used is made is reprocessed into super fine leather base cloth.In process of production, need be that solvent dissolves decrement with toluene to the marine facies of blended fiber---polyethylene, the polyethylene that will be dissolved in toluene again separates recovery.Traditional process for separating and recovering is to adopt vertical jacketed evaporator, carries out the batch (-type) evaporation and separates.Along with toluene separates with poly, polyethylene viscosity sharply rises, and the toluene evaporates resistance strengthens.When toluene level dropped to 35% in the polyethylene, toluene gas was difficult to overflow from the polyethylene molten mass.When toluene level dropped to 10%, toluene evaporates stopped substantially.The traditional handicraft evaporation efficiency is low, inferior separating effect, and the separation process energy consumption is big, and the time is long, and poly secondary operations is utilized difficulty.
Summary of the invention
The present invention is intended to propose that a kind of evaporation efficiency is higher, and separating effect is better, and the separation process energy consumption is less, and the time is shorter, the recovery technology that the polyethylene that obtains is easy to utilize, the separation and recovery technology and the device of polyethylene and toluene in a kind of superfine fibre preparation.
The separation and recovery technology of polyethylene and toluene may further comprise the steps in this superfine fibre preparation:
(1) poly toluene solution is reached below 50% with the percentage by weight that preevaporator is evaporated to toluene level;
(2) the poly toluene solution with (1) step gained reaches below 15% with the percentage by weight of the first horizontal column tube evaporimeter atmospheric evaporation to toluene level;
(3) polyethylene of (2) step gained and the mixture of toluene are reached below 1% with the percentage by weight of secondary series pipe evaporator reduction vaporization to toluene level;
(4) with (1), toluene vapor condensation, the recovery of (2), (3) step gained;
(5) with (3) step gained the polyethylene granulation.
The separating and reclaiming device of polyethylene and toluene comprises preevaporator, condensing unit, polyethylene relaying groove, the first horizontal column tube evaporimeter, the second horizontal column tube evaporimeter, first gear pump, second gear pump and vacuum system in this superfine fibre preparation.The toluene vapor outlet of preevaporator links to each other with the toluene vapor import of condensing unit, the shell side import of the first horizontal column tube evaporimeter links to each other with the material outlet of preevaporator by first gear pump, the shell side outlet of the first horizontal column tube evaporimeter links to each other with the shell side import of the second horizontal column tube evaporimeter, the shell side outlet of the second horizontal column tube evaporimeter links to each other with the import of polyethylene relaying groove by second gear pump, and the toluene vapor outlet of the second horizontal column tube evaporimeter links to each other with the import of vacuum system.
The separation and recovery technology of polyethylene and toluene and device are owing to increased on traditional evaporation separating technology by two horizontal column tube evaporimeters again in this superfine fibre preparation; the high-efficiency evaporating device that relaying groove, comminutor and a cover vacuum system are formed; separative efficiency improves greatly, and has reduced and separated in the polyethylene of back content of toluene thereby be easy to recycle.
Description of drawings
Fig. 1 is the schematic diagram of the separating and reclaiming device of polyethylene and toluene in the superfine fibre preparation;
Fig. 2 is the schematic diagram of vacuum system.
The specific embodiment
The step of the separation and recovery technology of polyethylene and toluene is as follows in this superfine fibre preparation:
(1) poly toluene solution is reached below 50% with the percentage by weight that preevaporator is evaporated to toluene level;
(2) the poly toluene solution with (1) step gained reaches below 15% with the percentage by weight of the first horizontal column tube evaporimeter atmospheric evaporation to toluene level;
(3) polyethylene of (2) step gained and the mixture of toluene are reached below 1% with the percentage by weight of secondary series pipe evaporator reduction vaporization to toluene level;
(4) with (1), toluene vapor condensation, the recovery of (2), (3) step gained;
(5) with (3) step gained the polyethylene granulation.
The separating and reclaiming device of polyethylene and toluene comprises preevaporator 2, condensing unit 1, polyethylene relaying groove 5, first horizontal column tube evaporimeter 3, the second horizontal column tube evaporimeter 4, first gear pump 9, second gear pump 10 and vacuum system 6 as shown in Figure 1 in this superfine fibre preparation.The toluene vapor outlet of preevaporator 2 links to each other with the toluene vapor import of condensing unit 1, the material of the shell side import of the first horizontal column tube evaporimeter 3 by first gear pump 9 and the preevaporator mixture of toluene (polyethylene with) exports and links to each other, the shell side outlet of the first horizontal column tube evaporimeter 3 links to each other with the shell side import of the second horizontal column tube evaporimeter 4, the shell side outlet of the second horizontal column tube evaporimeter links to each other with the import of polyethylene relaying groove by second gear pump 10, and the toluene vapor outlet of the second horizontal column tube evaporimeter links to each other with the import of vacuum system 6.
As shown in Figure 1, the toluene vapor outlet of the first horizontal column tube evaporimeter 3 in the preparation of this superfine fibre in the separating and reclaiming device of polyethylene and toluene can link to each other with the heating tube import of preevaporator 2, and (preevaporator 2 has the double flash evaporation jar among the figure, the toluene vapor outlet of the first horizontal column tube evaporimeter 3 links to each other with the heating tube import of the first order evaporator of preevaporator 2), described polyethylene relaying groove 5 has two, and phase also connects together.
On the first horizontal column tube evaporimeter 3 in this superfine fibre preparation in the separating and reclaiming device of polyethylene and toluene one first liquid level sensor 7 can also be arranged, the control signal output of first liquid level sensor links to each other with the control signal input of first gear pump 9, there is the control signal output of one second liquid level sensor 11, the second liquid level sensors to link to each other on the described second horizontal column tube evaporimeter 4 with the control signal input of the second horizontal column tube evaporimeter 4 shell side inlet control valves.
The course of work of the separating and reclaiming device of polyethylene and toluene is as follows in this superfine fibre preparation:
(1) when toluene level to 50% is following in the polyethylene in the preevaporator 2, by first gear pump 9 polyethylene and toluene mixture are transported to the first horizontal column tube evaporimeter 3 and carry out atmospheric evaporation, the mixture of polyethylene and toluene is advanced at shell side, the steam of logical 0.5～0.8Mpa heats in the tube side, the liquid level of polyethylene and toluene remains on about 40cm in the control shell side, tubulation is even dense distribution in the middle of mixture, She Ji advantage is like this, it is short that heat transmits distance, and rate of heat exchange is fast; Control lower liquid level simultaneously, the bubble rising resistance that toluene vaporization back forms is little, and the polyethylene ratio of effusion fusion is easier to.
(2) when toluene level to 15% is following in the polyethylene in the first horizontal column tube evaporimeter 3, the viscosity of the mixture of polyethylene and toluene can raise sharp, to such an extent as to the toluene bubble can be frozen in the polyethylene, at this moment, enter in the second horizontal column tube evaporimeter 4, carry out reduction vaporization by vacuum system 6 by gravity flow, strengthen the power that escapes on the toluene bubble, the control liquid level further reduces the resistance that bubble rises to about the 20cm, finishes separating of polyethylene and toluene.Residual toluene in the polyethylene can drop to below 1%.
(3) polyethylene with finish separating of toluene after; be transported in the relaying groove with second gear pump 10; when a relaying groove received the supplied materials of the second horizontal column tube evaporimeter 4, the polyethylene in another relaying groove entered comminutor 8 and carries out the granulation operation, and two relaying grooves are used alternatingly.
The charging rate of liquid level sensor 7 on (4) the first horizontal column tube evaporimeters 3 and the second horizontal column tube evaporimeter 4 and 11 control upstreams guarantees that evaporation process is continuous, stable operation.
The toluene gas that (5) first horizontal column tube evaporimeters 3 are evaporated enters preevaporator, and the mixture in the preevaporator is heated, and it is recycling to reach the energy, reduces thermal energy consumption.
The present invention compares with traditional handicraft and has following characteristics:
1, separative efficiency improves greatly, and device processes can the force rate traditional handicraft improve nearly one times.
2, work continuously, reduced labour intensity.
3, reduce the content of toluene in the polyethylene, improved the separating effect of polyethylene and toluene, reduced environmental pollution.
Claims (4)
1. the separation and recovery technology of polyethylene and toluene during a superfine fibre prepares is characterized in that its step is as follows:
(1) poly toluene solution is reached below 50% with the percentage by weight that preevaporator is evaporated to toluene level;
(2) the poly toluene solution with (1) step gained reaches below 15% with the percentage by weight of the first horizontal column tube evaporimeter atmospheric evaporation to toluene level;
(3) polyethylene of (2) step gained and the mixture of toluene are reached below 1% with the percentage by weight of secondary series pipe evaporator reduction vaporization to toluene level;
(4) with (1), toluene vapor condensation, the recovery of (2), (3) step gained;
(5) with (3) step gained the polyethylene granulation.
2. the separating and reclaiming device of polyethylene and toluene during a superfine fibre prepares, comprise preevaporator (2), condensing unit (1), polyethylene relaying groove (5), the toluene vapor outlet of preevaporator links to each other with the toluene vapor import of condensing unit, it is characterized in that the separating and reclaiming device of polyethylene and toluene also comprises the first horizontal column tube evaporimeter (3) in the preparation of this superfine fibre, the second horizontal column tube evaporimeter (4), first gear pump (9), second gear pump (10) and vacuum system (6), the shell side import of the first horizontal column tube evaporimeter links to each other with the material outlet of preevaporator by first gear pump (9), the shell side outlet of the first horizontal column tube evaporimeter links to each other with the shell side import of the second horizontal column tube evaporimeter, the shell side outlet of the second horizontal column tube evaporimeter links to each other with the import of polyethylene relaying groove by second gear pump (10), and the toluene vapor outlet of the second horizontal column tube evaporimeter links to each other with the import of vacuum system.
3. the separating and reclaiming device of polyethylene and toluene in the superfine fibre preparation as claimed in claim 2, the toluene vapor outlet that it is characterized in that the described first horizontal column tube evaporimeter (3) links to each other with the heating tube import of preevaporator (2), described polyethylene relaying groove (5) has two, and phase also connects together.
4. the separating and reclaiming device of polyethylene and toluene in the superfine fibre preparation as claimed in claim 3, it is characterized in that on the described first horizontal column tube evaporimeter (3) one first liquid level sensor (7) being arranged, the control signal output of first liquid level sensor links to each other with the control signal input of first gear pump (9), on the described second horizontal column tube evaporimeter (4) one second liquid level sensor (11) is arranged, the control signal output of second liquid level sensor links to each other with the control signal input of second horizontal column tube evaporimeter (4) the shell side inlet control valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010535554A CN102029077B (en) | 2010-11-02 | 2010-11-02 | Technology and device for separating and recycling polyethylene and methylbenzene in preparation of superfine fibers |
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| CN201010535554A CN102029077B (en) | 2010-11-02 | 2010-11-02 | Technology and device for separating and recycling polyethylene and methylbenzene in preparation of superfine fibers |
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| CN102029077A true CN102029077A (en) | 2011-04-27 |
| CN102029077B CN102029077B (en) | 2012-09-19 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824751A (en) * | 2012-08-31 | 2012-12-19 | 烟台东洁环保机械工程有限公司 | Distillation separation and recovery method for toluene-polyethylene mixed solution and used equipment |
| CN102886150A (en) * | 2012-09-20 | 2013-01-23 | 烟台东洁环保机械工程有限公司 | Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method |
| CN102976542A (en) * | 2012-11-29 | 2013-03-20 | 泉州万华世旺超纤有限责任公司 | Wastewater reusing system in production of superfine fiber leather |
| CN104389185A (en) * | 2014-10-08 | 2015-03-04 | 上海华峰超纤材料股份有限公司 | Rubber patch-type superfine fiber synthetic leather prepared from reduced toluene residues as raw materials and preparation method thereof |
| CN105908523A (en) * | 2016-05-24 | 2016-08-31 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Process and device for recycling polyethylene recovered from microfiber synthetic leather production |
| CN106866916A (en) * | 2017-03-28 | 2017-06-20 | 嘉兴禾欣化学工业有限公司 | Easily extract the preparation method of the polyurethane resin for superfine fiber synthetic leather of marine facies |
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| CN2666527Y (en) * | 2003-12-08 | 2004-12-29 | 大连理工大学 | Energy-saving multi-effect carrier gas membrane lifting single-stroke evaporation device |
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| CN1049460A (en) * | 1990-06-12 | 1991-02-27 | 任凯 | Utilize the method for last evaporator indirect steam preheating vaporizing raw liquor |
| US6225360B1 (en) * | 1998-06-20 | 2001-05-01 | Kwang Kim | Method and system for recovering polyethylene from waste resin-compounds |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102824751A (en) * | 2012-08-31 | 2012-12-19 | 烟台东洁环保机械工程有限公司 | Distillation separation and recovery method for toluene-polyethylene mixed solution and used equipment |
| CN102824751B (en) * | 2012-08-31 | 2014-11-26 | 烟台东洁环保机械工程有限公司 | Distillation separation and recovery method for toluene-polyethylene mixed solution and used equipment |
| CN102886150A (en) * | 2012-09-20 | 2013-01-23 | 烟台东洁环保机械工程有限公司 | Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method |
| CN102886150B (en) * | 2012-09-20 | 2015-02-11 | 烟台东洁环保机械工程有限公司 | Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method |
| CN102976542A (en) * | 2012-11-29 | 2013-03-20 | 泉州万华世旺超纤有限责任公司 | Wastewater reusing system in production of superfine fiber leather |
| CN102976542B (en) * | 2012-11-29 | 2016-04-20 | 泉州万华世旺超纤有限责任公司 | Waste water reuse system in superfiber leather production |
| CN104389185A (en) * | 2014-10-08 | 2015-03-04 | 上海华峰超纤材料股份有限公司 | Rubber patch-type superfine fiber synthetic leather prepared from reduced toluene residues as raw materials and preparation method thereof |
| CN104389185B (en) * | 2014-10-08 | 2016-07-06 | 上海华峰超纤材料股份有限公司 | With decrement toluene residue for raw material prepare drip mould superfine fiber chemical leather and method for making |
| CN105908523A (en) * | 2016-05-24 | 2016-08-31 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Process and device for recycling polyethylene recovered from microfiber synthetic leather production |
| CN105908523B (en) * | 2016-05-24 | 2018-06-15 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | The process and device that the polyethylene recycled in a kind of microfiber synthetic leather production recycles |
| CN106866916A (en) * | 2017-03-28 | 2017-06-20 | 嘉兴禾欣化学工业有限公司 | Easily extract the preparation method of the polyurethane resin for superfine fiber synthetic leather of marine facies |
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| CN102029077B (en) | 2012-09-19 |
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Effective date of registration: 20151014 Address after: The East Road Hexin Industrial Park of Jiaxing city in Zhejiang province 314003 Patentee after: Hexin Kuraray Microfibric Leather (Jiaxing) Co., Ltd. Patentee after: ZHEJIANG HEXIN NEW MATERIAL CO., LTD. Address before: The East Road Hexin Industrial Park of Jiaxing city in Zhejiang province 314003 Patentee before: Hexin Kuraray Microfibric Leather (Jiaxing) Co., Ltd. Patentee before: Zhejiang Hexin Industry Group Co., Ltd. |