CN1391511A - 回收pet材料的方法和装置 - Google Patents
回收pet材料的方法和装置 Download PDFInfo
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Abstract
一种回收PET材料或和/或由PET材料制成的物品的方法规定了,要处理的PET材料在预处理中被加热、干燥并同时在高温下结晶。这种预处理后是真空主处理。在主处理中,经过处理的材料再被烘干并在高于预处理温度的温度下结晶。最好在主处理过程中还不进行材料塑性化,材料的塑性化或熔化在主处理步骤后进行。一种执行该方法的装置具有一个其中回收材料在高温下进行烘干并同时结晶并或许也被切碎的预处理装置(3)。一个主处理装置(4)与预处理装置相连,其中使送来的PET材料烘干、结晶并被加热到一个高于预处理装置的温度的温度。
Description
本发明涉及如权利要求1前序部分或如权利要求16前序部分所述的回收PET材料的方法和装置。
PET材料(由聚乙烯二甲酸乙二酯构成的材料)是指所有PET物质和/或PET物品,它也包括BOPET(双取向PET)且尤其是团块、瓶研磨碎片、薄膜、纤维、絮片等。
当回收由聚乙烯二甲酸乙二酯或聚乙烯二甲酸乙二酯材料制成的物品时,为了防止在塑性化或在熔化时由氢造成分子链水解分解,要回收的PET材料要尽可能干燥是很重要的。但是,有效的干燥只能在温度较高时实现,在这样的高温下,未结晶的PET颗粒或团块粘结在一起。因此,应该在干燥前实现PET材料的结晶。这样的结晶是如此实现的,即均匀地使颗粒在这样一个温度下运动或承受机械力,即该温度低于干燥温度,但在任何情况下都低于塑性化温度。
但由于用于回收的PET材料或由PET制成的物品且尤其是PET瓶子大多被污染并进行清洗以及或许先进行切碎,其中在切碎时经常无法避免同时被弄脏,所以,在大多数情况下,先进行物品的分别切碎或研磨、清洗和干燥。这样的预烘干至少是如此有效的,即湿度不超过要使用或要回收的PET材料的1.5wt%。
本发明的目的尤其是提供一种上述类型的方法及装置,通过该方法和装置进行快速且尽可能节省能量的回收,其中用生产出的熔融物制成的PET颗粒或由此制成的PET物品具有高粘度值,尤其是,其粘性可以与要回收的PET材料的粘性相媲美。此外,获得的熔融物或由熔融物制成的PET颗粒可满足食品技术规定,即送去回收的PET材料所含的有害物质或污染成分通过适当处理而尽可能地被除去。
在上述类型的方法中,根据权利要求1特征部分所述的特征实现了上述目的。通过权利要求16特征部分所述的特征概括了根据本发明的上述类型装置的特点。
因此,实现了两级处理回收的或装入的PET材料,其中在预处理装置的预处理过程中不进行PET材料的塑性化,但进行结晶并在干燥的同时进行一定的预压实。预压实是在相应的温度下通过把施加机械冲击或把能量输入PET材料中而引起的。尤其是,温度的升高或调节通过对PET材料施加机械冲击或通过因出现摩擦损失而把至少一个转动的混合和/或切碎部件的转动能转换成热能来进行。
在主处理装置的主处理过程中,使PET材料在高温下进一步烘干、结晶并在高真空条件下保持一定的平均停留时间。仍然借助一个转动的混合部件或切碎部件来进行机械冲击或材料致密和输入能量,该部件因其转动而把相应的热能输入PET材料中并继续加热它。
在真空下进行的主处理把残余湿度降低到一预定平均值并也造成从PET材料中除去挥发性有害物质。
主处理时的温度保持在预处理温度以下且尤其是大约在熔点下40℃-60℃。但力争尽可能地提高该温度。
在主处理后,马上借助一个最好直接与主处理装置相连的挤压机进行送出PET材料的塑性化。由于直接真空密封的连接,所以,主处理装置中的真空一直作用到挤压机入口区中。这个挤压机具有塑性化区,一个压缩区和堆积区与之相连。一个除气区或抽真空区与堆积区相连,在这个区域内,借助真空且尤其是高真空条件从熔融物中抽出挥发性物质。在这里,可以规定一级或多级的除气方式。也可以先后连续设置多个具有不同真空值的压缩区或减压区。因此,也可以蒸发掉难蒸发的或坚固的杂质。
通过相应地选择温度和在预处理装置和主处理装置中的停留时间,可以调节从挤压机中输出来的熔融物和由熔融物制成的PET颗粒的粘度。由于停留时间适当地长并且真空下的温度适当地高,所以,对粘度产生有利影响或者实现了再聚合。
在以下说明书、权利要求书和附图中得到了本发明的有利实施例。在附图中详细示出了本发明的两个实施例。
图1示出了本发明的一个实施例,其中PET材料从预处理装置中被直接送往主处理装置。
图2示出了本发明的一个实施例,其中PET材料从预处理装置通过中间存储区被送往主处理装置。
要回收的PET且尤其是PET材料和/或由PET构成的物品在切碎单元1中被切碎并通过清洗单元2被送往一个预烘干装置14。必要时,要回收的PET瓶子和PET容器有利地先进行分拣并被预研磨成平均大小约为15毫米-25毫米的磨碎材料。经过研磨、清洗和烘干的PET材料的残余湿度因加工方法的原因而应尽可能地低并最高为1.5wt%。
为了进行预处理,PET材料被送往一个预烘干处理装置3,其中它活血也可以被切碎。在预处理装置3中,与烘干同时地进行材料的加热和结晶。为此,在预处理装置3中设置一个转动的混合和/或切碎部件,它以9米/秒-15米/秒的圆周速度转动。由此确保了电机的机械能通过混合机构和PET颗粒或PET材料之间的摩擦被转换成热。如此调节PET材料的物料量,即其平均停留时间约为35分钟-65分钟并最好为40分钟-60分钟。在这种情况下,PET材料的温度被调节到140℃-190℃并最好为150℃-160℃。在这种温度下,表面水马上蒸发,由于长时间停留,所以也释放出相当多的所含湿度和其它所含杂质。当PET材料在预处理装置中的处理在真空下进行时,不一定要这样做,但最好如此。因此,可以缩短PET材料在预处理装置3中的停留时间或者相应地减小其体积。当应使要处理的材料尤其不受氧化威胁或者不一定要在预处理装置3进行切碎时,这样的工艺控制尤其是合理的。
预处理装置3尤其借助一个装料单元18如输送带并最好是连续地装PET材料,通过输送机构7且尤其是螺旋输送机构从预处理装置中送出PET材料。可以直接(图1)或通过中间存储区6(图2)和通过另一个输送机构如螺旋输送机构17地把PET材料送往主处理装置4。
最好给主处理装置4装填已加热的PET材料。
预处理装置3给输送机构7装料并且输送机构保持在140℃-170℃且最好是150℃-160℃。
在主处理装置4中,部分松软的PET材料粘结块通过一个转动的混合和/或切碎部件5′被尽可能地打碎并且塑料温度被升高到170℃-210℃且尤其是180℃-210℃。混合和/或切碎部件5′的圆周速度基本上约等在预处理装置3中的混合和/或切碎部件的圆周速度并也约等于9米/秒-15米/秒。
主处理装置4的容器体积和材料的物料流量是如此选择的,即PET材料获得了40-90分钟且尤其是50-90分钟的平均停留时间。主处理装置4中的压力被调节到不到20毫巴且最好是不到10毫巴,以便获得最佳结果。
填充主处理装置4可以直接借助螺杆7或借助闸门装置15来进行,所述闸门装置以两个气密的或真空密封的滑板15′来工作并因此分批装入PET材料。一个真空泵16与主处理装置4相连。
一个挤压机8与主处理装置4相连,该挤压机对主处理装置4交付的PET材料进行深加工。在挤压机8中,使PET材料塑性化或熔化。挤压机8可以具有至少一个除气区9,以便调节出小于10毫巴且尤其是小于5毫巴的压力。通过设置至少一个除气区和或许抽真空,可以对除去湿度和/或其它分离产物施加影响。挤压机8有利地具有至少一个双除气区。
如图所示,在遵循上述工艺参数的情况下,可以获得熔融PET材料或PET颗粒的粘度值,这个值比装填的PET材料的粘度值约高5%。这种粘度增强尤其是可以通过两级工艺控制以及过相应地调节温度、停留时间、真空压力和真空区或除气区的数量来获得。还如图所示,除了湿度外,也可以通过相应地选择在挤压机中的温度、压力、停留时间和剪切情况来除去其它分离产物。
在本发明的一个优选实施例中,挤压机8与主处理装置4气密连接,从而主处理装置4的真空可以作用在挤压机入口上。
一个筛分机构或过滤机构11可以与挤压机8相连,流出的熔融物可以从这个筛分机构或过滤机构中被送往制造PET颗粒的装置12。在挤压机8和过滤装置11之间,可以设置一个用于测量所获熔融物的粘度的装置13。
PET材料从预处理装置3被送往主处理装置4最好在隔绝空气的情况下进行,以便排除水分又进入已被预烘干的PET材料中。
为了避免施加在挤压机8且尤其是除气区内的真空反作用于主处理装置4,采取这样的预防措施,即在挤压机8中的压缩或对由挤压机8送来的材料的致密作用是如此强,以至避免了真空对主处理装置4的反作用。这也适用于主处理装置4的真空对预处理装置3的反作用。但在这种情况下,通过用适当的闸板15′关闸来排除反作用。当预处理装置3直接与主处理装置4相连时,要注意真空密封的螺旋输送机构。
在主处理装置4装料时,在设置在主处理装置4前的闸门处,已使已装填的PET材料处于真空下,从而在主处理装置4中没有发生额定值的压降。这是有利的,因为真空值直接影响到有害物质的分离和粘性。
当使用中间存储区6(图2)时,可以容忍不均匀地给预处理装置3装料。
在大多数情况下,通过用转动的混合和/或切碎部件5、5′输入能量来获得装在预处理装置3和主处理装置4中的PET材料的升温就足够了。但也可以附加加热预处理装置3和/或主处理装置4。
在预处理和主处理后,也可以切碎PET材料,因此要相应地形成混合和/或切碎部件。
没有示出用于混合和/或切碎部件5、5′或输送机构7、17或挤压机8的传动装置,或者用M表示所述传动装置。
Claims (29)
1、一种回收PET材料的方法,其中使回收的PET材料干燥、结晶和塑性化或熔化并随后或许在过滤后将其加工成PET颗粒,其特征在于,回收的PET材料在预处理过程中被加热并使其在高温下干燥和同时进行结晶,随后,在塑性化或熔化前进行的主处理在真空情况下使PET材料接受再次干燥和结晶以及与预处理相比更高的温度。
2、如权利要求1所述的方法,其特征在于,回收的PET材料在预处理前接受预切碎和/或清洗和/或预烘干。
3、如权利要求1或2所述的方法,其特征在于,主处理的温度也保持在PET材料的塑性化温度以下。
4、如权利要求1-3之一所述的方法,其特征在于,最好在大气压下进行的PET块和/或PET瓶研磨碎片的预处理在140℃-190℃且最好是150℃-160℃的温区内并在同时进行机械处理或利用至少一个混合和/或切碎部件的且起加热作用的能量输入的情况下进行,其中PET材料的平均停留时间或预处理的持续时间为35分钟-65分钟且最好为40分钟-60分钟。
5、如权利要求1-3之一所述的方法,其特征在于,最好在大气压下进行的PET薄膜和/或PET纤维和/或PET絮片的预处理在170℃-200℃且最好是180℃-200℃的温区内并在同时进行机械处理或利用至少一个混合和/或切碎部件的且起加热作用的能量输入的情况下进行,其中PET材料的平均停留时间或预处理的持续时间为10分钟-30分钟且最好为10分钟-15分钟。
6、如权利要求1-5之一所述的方法,其特征在于,PET材料以连续流的形式接受预处理。
7、如权利要1-6之一所述的方法,其特征在于,经过预处理的PET材料在预处理和主处理之间接受中间存储,中间存储的时间等于预处理持续时间的80%-120%,经过预处理的PET材料在中间存储过程中和/或在被送去主处理的过程中被保持在一个尽可能均匀的且尤其是130℃-190℃并最好是150℃-170℃的温度上。
8、如权利要1-7之一所述的方法,其特征在于,在真空下且尤其是在低于20毫巴且最好是低于10毫巴的压力下进行的主处理过程中,经过预处理的PET块和/或瓶子研磨碎片在170℃-210℃且最好是180℃-200℃的温度下进行处理或接受通过至少一个且最好是转动的混合和/或切碎部件的且产生加热作用的能量输入,PET材料的平均停留时间或主处理持续时间为40分钟-100分钟且尤其是50分钟-90分钟。
9、如权利要求8所述的方法,其特征在于,主处理在低于20毫巴且最好是低于10毫巴的压力下进行。
10、如权利要求1-7之一所述的方法,其特征在于,在真空下进行的主处理过程中,经过预处理的PET薄膜和/或PET纤维在160℃-210℃且最好是170℃-205℃下进行处理或者接受通过至少一个混合和/或切碎部件的且产生加热作用的机械能量输入,其中PET材料的平均停留时间或主处理持续时间为5分钟-25分钟且尤其是1分钟-15分钟。
11、如权利要求10所述的方法,其特征在于,主处理在低于150毫巴且最好是低于50毫巴的压力下进行。
12、如权利要求5-11之一所述的方法,其特征在于,装入一个转动的混合和/或切碎部件。
13、如权利要1-12之一所述的方法,其特征在于,PET材料在预处理前被切碎到15毫米-25毫米。
14、如权利要1-13之一所述的方法,其特征在于,回收的PET材料在预处理前被预切碎和/或清洗和/或预烘干。
15、如权利要1-14之一所述的方法,其特征在于,PET材料在真空条件下从主处理装置(4)中被交付给挤压机(8),或者在主处理装置(4)中的真空一直作用到挤压机(8)的入口区内。
16、一种尤其是用于执行如权利要求1-9之一所述方法的PET材料回收装置,其中使回收的PET材料干燥、结晶、塑性化或熔化,熔融物或许在过滤后被有利地加工成PET颗粒,其特征在于,为了预处理回收的PET材料而设置了一个用于在高温下烘干并同时使PET材料结晶的预处理装置(3),使一个用于继续烘干、结晶和升高由预处理装置(3)送来的PET材料的主处理装置(4)位于该预处理装置后面。
17、如权利要求16所述的装置,其特征在于,预处理装置(3)也进行PET材料的切碎。
18、如权利要求16或17所述的装置,其特征在于,不仅在预处理装置(3)中,而且在主处理装置(4)中,分别设置了至少一个转动的混合和/或切碎部件(5,5′),它对PET材料进行机械处理和加热。
19、如权利要求18所述的装置,其特征在于,尤其是为了切碎PET块和/或瓶子研磨碎片,一个混合切碎部件(5,5′)在预处理装置(3)中以9米/秒-15米/秒的圆周速度转动并在主处理装置(4)中也以9米/秒-15米/秒的圆周速度转动。
20、如权利要求18所述的装置,其特征在于,尤其是为了切碎PET薄膜和/或PET纤维和/或PET絮片,至少一个混合切碎部件(5,5′)在预处理装置(3)和主处理装置(4)中都以15米/秒-35米/秒的圆周速度且尤其是20米/秒的圆周速度转动。
21、如权利要求16-20之一所述的装置,其特征在于,在预处理装置(3)和主处理装置(4)之间接入一个中间存储区(6),其体积是预处理装置(3)体积的100%-200%。
22、如权利要求16-21之一所述的装置,其特征在于,在预处理装置(3)和中间存储区(6)之间和在中间存储区(6)和主处理装置(4)之间,分别设置了一个绝热的和/或被加热的输送机构(7)且最好是一个螺旋输送机构或一个挤压机。
23、如权利要求16-22之一所述的装置,其特征在于,主处理装置(4)的体积是预处理装置(3)体积的80%-200%且最好是100%-180%。
24、如权利要求16-23之一所述的装置,其特征在于,一个挤压机(8)与主处理装置(4)相连,在该挤压机中,从主处理装置中取出的PET材料被加热到260℃-275℃并进行塑性化或被熔化。
25、如权利要求24所述的装置,其特征在于,挤压机(8)气密地或真空密封地与主处理装置(4)相连,主处理装置(4)的入口区压力适当地与主处理装置(4)的内腔连通,或者在主处理装置(4)中的压力等于在挤压机(8)入口区中的压力。
26、如权利要求24或25所述的装置,其特征在于,挤压机(8)具有至少一个除气区(9),一个真空泵(10)与该除气区相连,可以通过所述真空泵调节出小于40毫巴且尤其是小于10毫巴的压力。
27、如权利要求16-25之一所述的装置,其特征在于,一个用于PET熔融物的过滤装置(11)与挤压机(8)相连,或许一个用于制造成品和半成品如PET颗粒的装置(12)与该装置(11)相连。
28、如权利要求27所述的装置,其特征在于,在挤压机(8)和过滤装置(11)之间设置一个用于确定熔融物粘度的测量装置(13)。
29、如权利要求16-28之一所述的装置,其特征在于,主处理装置(4)中的压力可以被调节到小于150毫巴且最好是小于20毫巴。
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- 2000-09-22 EP EP20000991966 patent/EP1214181B1/de not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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ES2210031T3 (es) | 2004-07-01 |
AT411161B (de) | 2003-10-27 |
JP2003525142A (ja) | 2003-08-26 |
ATE254020T1 (de) | 2003-11-15 |
KR20020042686A (ko) | 2002-06-05 |
AU768183B2 (en) | 2003-12-04 |
CN1261291C (zh) | 2006-06-28 |
BR0014223B1 (pt) | 2011-11-29 |
WO2001021372A1 (de) | 2001-03-29 |
CA2388380A1 (en) | 2001-03-29 |
ZA200201886B (en) | 2003-12-31 |
KR100469205B1 (ko) | 2005-02-05 |
EP1214181B1 (de) | 2003-11-12 |
PT1214181E (pt) | 2004-03-31 |
US6784214B1 (en) | 2004-08-31 |
US7108500B2 (en) | 2006-09-19 |
AU7761000A (en) | 2001-04-24 |
CA2388380C (en) | 2006-11-21 |
DK1214181T3 (da) | 2004-03-15 |
BR0014223A (pt) | 2002-05-21 |
DE50004450D1 (de) | 2003-12-18 |
ATA162099A (de) | 2003-03-15 |
JP3718470B2 (ja) | 2005-11-24 |
EP1214181A1 (de) | 2002-06-19 |
US20040219247A1 (en) | 2004-11-04 |
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