CN102040743B - 回收有机聚合物的方法 - Google Patents
回收有机聚合物的方法 Download PDFInfo
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- CN102040743B CN102040743B CN201010549800.0A CN201010549800A CN102040743B CN 102040743 B CN102040743 B CN 102040743B CN 201010549800 A CN201010549800 A CN 201010549800A CN 102040743 B CN102040743 B CN 102040743B
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Abstract
本发明的一个方面涉及一种回收有机聚合物的方法,包括:添加吸附剂到废水中以吸附第二有机聚合物,该吸附剂由磁芯颗粒和在磁芯颗粒上形成的吸附层组成,废水包含具有良好的水溶性的第一有机聚合物和具有差的水溶性的第二有机聚合物。该方法还包括通过磁力分离从废水中回收带有吸附剂的第二有机聚合物,从而获得包含第一有机聚合物的溶液;并再利用该溶液。
Description
发明的交叉引用
本申请基于并要求2009年10月15日提出的在先日本专利申请号2009-238697的优先权;其全部内容在此援引加入。
技术领域
本发明涉及一种回收有机聚合物的方法。
背景技术
最近,由于工业发展和人口增长,需要有效利用水源。基于此观点,例如工业废水的废水的再利用非常重要。废水的再利用可以通过废水净化来实现,也就是说,从废水中分离除水之外的其他成分。
已知有多种从液体中分离其它成分的方法。例如,膜分离、离心分离、活性碳吸附、臭氧处理、凝聚和用吸附剂除去悬浮物。利用上述方法可以除去水中显著影响环境的化工材料,如含磷组分和含氮组分,并且可以除去分散在水中的油和粘土。
如上所述的分离方法中,膜分离是最常用的分离方法之一,但是,在除去分散于水中的油时,膜的细孔可能受到堵塞,导致膜寿命缩短的缺点。基于此观点,膜分离不太可能适用于从水中除油。
因此,一种除去油如重油的方法使用设置在水表面上的拦油栅收集浮在水面上的重油,该方法利用了重油漂浮的性质,吸附和回收漂浮的重油。作为一种替代的方法,利用下述除去方法,其依靠憎水材料对水表面上重油的吸附性,吸附和回收漂浮的重油。
另一方面,机械加工方法中,如切削方法和磨削方法,利用一种切削液(具有良好的水溶性)润滑和冷却,以降低机械加工的摩擦和磨合。切削液在机械和有机械的装置中循环,但是,在机械加工方法中,油,如齿轮油(具有差的水溶性)在切削液中受污染同时引起切削液的污染。可利用一种简化设备如撇油器除去漂浮在切削液表面上的齿轮油,但,撇油器的除去性能差,导致循环使用切削液的一些缺点(参见参考文献1)[参考文献1]JP-A-2003-200331(KOKAI)
附图说明
图1是回收有机聚合物方法的一个实施方案的流程图
具体实施方式
在下文,将参照附图详细描述本发明。
本发明一方面涉及一种回收有机聚合物的方法,包括:向废水中添加吸附剂以吸附第二有机聚合物,吸附剂包含磁芯颗粒和在磁芯颗粒上形成的吸附层,废水包含具有良好的水溶性的第一有机聚合物和具有差的水溶性的第二有机聚合物。该方法也包括利用磁力分离从废水中回收带有吸附剂的第二有机聚合物,从而获得含第一有机聚合物的溶液,以及溶液再利用。
(吸附剂)在该实施方案中,吸附剂是由磁芯颗粒和在磁芯颗粒上形成的吸附层构成。
<磁芯颗粒>如上所述,构成吸附剂的核心颗粒由一种磁性材料制成,因为在回收有机聚合物时,需要吸附有机聚合物的吸附剂借助磁力从相应的废水中分离出来,这将在下面描述。
制造磁芯颗粒的磁性材料要求是一种在室温下可以呈现铁磁性的磁性材料。在本实施方案中可用的磁性材料不限于上面描述的磁性材料,可以使用常规的磁性材料,例如,铁、铁合金、磁铁矿、钛铁矿、磁性黄铁矿、氧化镁铁氧体、钴铁氧体、镍铁氧体或钡铁氧体。
其中,由于铁氧体基化合物在水中是稳定的,铁氧体基化合物可优选用于从相应的废水中回收有机聚合物的操作。特别地,由于磁铁矿(Fe3O4)不贵、本身作为磁性材料在水中稳定以及元素组成安全,磁铁矿容易地并且优选地用于水处理。
磁芯颗粒的尺寸不限制,只要目标吸附剂可设置在规定尺寸范围内。例如,磁芯颗粒的平均直径设置在0.05~100μm范围内,优选地在0.2~5μm范围内。平均直径借助激光衍射法检测。具体地,用Shimadzu公司的SALD-DS21型测量仪(商品名)测量平均直径。
如果磁芯颗粒的平均直径大于100μm,包含磁性颗粒的团聚颗粒的尺寸变得太大,以致团聚颗粒在水(相应的废水)中的扩散倾向于恶化。此外,团聚颗粒有效表面积的减少导致有机聚合物的吸附量倾向于不期望的降低。如果磁芯颗粒的平均直径小于0.05μm,磁性颗粒作为原始粒子集合浓密,使得团聚颗粒表面积如上所述不期望的减少。
磁芯颗粒的形状不限制,但是,可以设为球形,多面体或无定形。期望的磁芯颗粒的粒子大小及形状可以根据制造费用来适当设置。球体形式或带圆角的多面形式较适合作为磁性颗粒。如果磁芯颗粒具有尖边,形成目标吸附剂时,覆盖磁芯颗粒的吸附层可能受损坏,这样,吸附剂将不能维持要求的形状。
磁性颗粒偶尔需要标准的电镀处理,如铜镀或镍镀,此外,可以处理磁芯颗粒表面以阻止其内部腐蚀。
(吸附层)第一,吸附剂的吸附层可以由下列物质构成:如,苯乙烯聚合物、氢化苯乙烯聚合物、丁二烯聚合物、异戊二烯聚合物、丙烯腈聚合物、环烯烃聚合物、烷基丙烯酸酯聚合物、苯酚聚合物和/或烷基甲基丙烯酸酯聚合物。对于具有良好的水溶性的有机聚合物,上述聚合物分别具有低亲合力,并且不能呈现它们的吸附性能。相反,对于具有较差水溶性的有机聚合物,上述聚合物分别具有高亲合力,并且,可以呈现它们的吸附性能。因此,如果吸附层包含一个或多个上述聚合物,仅仅可以从相应的废水中带出具有差的水溶性有机聚合物。
以上列举的聚合物分别具有低水溶性。例如,每种列举的聚合物的溶解度在10mg/L或更少的范围之内,特别是,在10μg/L或更少的范围内。这种情况下,获得的吸附剂浸于相应的废水中,以便吸附具有差的水溶性的目标有机聚合物,列举的聚合物洗脱可以被阻止,这样,吸附剂可以呈现作为有机物吸附剂的内在功能/影响。
在下面描述的回收操作中,在具有较差水溶性的有机聚合物被吸附剂吸附后,用给定的溶剂洗涤并除去,吸附剂再利用。以上列举的聚合物对于洗出有机聚合物的溶剂分别具有高的溶解阻力(例如,溶解度为1000mg/L或更低)。因此,以上列举的聚合物可以在溶剂冲洗后再利用,优选作为吸附剂的吸附层。
由于苯乙烯聚合物、丙烯腈聚合物和烷基甲基丙烯酸酯聚合物经过50次溶剂冲洗操作都不会恶化,这些聚合物优选用作吸收层。
可以仅使用上述聚合物中一种,但也可以从上述聚合物中选出一些作为复合材料使用。此外,可以使用由一些上述聚合物制成的共聚物,这些共聚物通过相应的单体共聚得到,因而,其中包含相应的聚合物骨架。
磁芯颗粒上吸附层的形成是如下进行:磁芯颗粒分散在给定溶剂中形成分散介质,同时,一个或多个聚合物溶于另一种溶剂以形成溶液。然后,分散介质和溶液混合并用喷雾干燥法喷射,这样选取的聚合物可以围绕磁芯颗粒粒化。
其次,吸附剂的吸附层可由一种偶联剂制成,在这种情况下,磁芯颗粒的表面用目标偶联剂处理。干燥表面处理和润湿表面处理都将采用。
使用的偶联剂可以采用硅烷偶联剂。具体地,举例有,烷基硅烷,如甲基三甲氧基硅烷、乙基三甲氧基硅烷、己基三甲氧基硅烷、十二烷基三甲氧基硅烷、十八烷基三甲氧基硅烷和乙基三乙氧基硅烷;一种芳香的硅烷,如苯基三甲氧基硅烷和萘三甲氧基硅烷;环氧硅烷,如γ-缩水甘油氧基丙基三甲氧基硅烷、γ-缩水甘油氧基丙基甲基二乙氧基硅烷和β-(3,4-环氧环己基)乙基三甲氧基硅烷;乙烯基硅烷,如乙烯基三乙氧基硅烷、乙烯基三甲氧基硅烷、γ-甲基丙烯酰氧基甲氧基硅烷;氨基硅烷,如γ-氨基丙基三乙氧基硅烷、γ-氨基丙基三甲氧基硅烷、N-苯基-γ-氨基丙基三甲氧基硅烷;以及巯基硅烷,如γ-巯丙基三甲氧基硅烷。替代地,一种偶联剂,举例如,钛酸盐、铝螯合物和锆-铝螯合物。
鉴于对具有差的水溶性的有机聚合物有优异吸附性,可优选使用硅烷偶联剂。
当吸附层在磁芯颗粒上形成时,可能向偶联剂中加入一种或多种对具有差的水溶性的有机聚合物有高亲合力的官能团。例如,如果被取代的或未被取代的具有1到30个碳的脂肪族烃或一种芳烃与偶联剂反应,可以加入上述官能团。在这种情况下,官能团为烃基团,如烷基。
第三,吸附剂的吸附层可由偶联剂的缩合产物制成。这种缩合产物可利用湿法工艺生产。例如,硅烷偶联剂加入含酸性物质或碱性物质的溶液中,得到浆液,引起水解反应,然后在喷雾干燥过程同时发生缩合反应。在此情况下,通过利用有机溶剂作为溶液(浆液)的溶剂,必须检测有机溶剂的蒸发和泄漏,导致吸附层生产成本的增加。鉴于在一个装置上的成批生产工艺或类似生产,采用无环境载荷的水替代有机溶剂用作溶液(浆液)的溶剂十分有效,同样也涉及替代有机溶剂的生产成本和安全性。
偶联剂可以使用上述列举的偶联剂,优选上述列举的硅烷偶联剂。
偶联剂缩合产物的缩合度在十到几百万的范围内。
第四,吸附剂的吸附层可由氧化物制成。具体地,吸附层可由选自下述组中至少一种的氧化物构成,该组包括Si、Ti、Zr、Al、Zn、Ba、Sn、W、Mo、Cr、In、Sb、Co、Fe、Nb、Pb、Yb、La、Re、Sr、Th和Ta。作为氧化物举例有三氧化钴(CoO3)、氧化钴(CoO)、氧化钨(WO3)、氧化钼(MOO3)、铟-锡氧化物(ITO)、氧化铟(In2O3)、氧化铅(PbO2)、PZT、氧化铌(Nb2O5)、氧化钍(ThO2)、氧化钽(Ta2O5)、钛酸钙(CaTiO3)、钴酸镧(LaCOO3)、三氧化铼(ReO3)、氧化铬(Cr2O3)、氧化铁(Fe2O3)、铬酸镧(LaCrO3)、钛酸钡(BaTiO3)。
磁芯颗粒上形成吸附层可以如下进行:首先,制备相应粉状氧化物,然后,粉状氧化物和磁芯颗粒分散到给定的溶剂中形成分散介质,利用喷雾干燥法喷射该分散介质,使粉状氧化物围绕磁芯颗粒粒化。
作为一种替代的方法,制备前体,如醇盐、醋酸盐、金属的有机酸盐、金属盐、金属皂以及卤化物,并且在造粒过程中同时进行热分解形成上述氧化物。
(生产吸附剂)在本实施方案中,采用上述造粒过程的同时,通过在磁芯颗粒上形成吸附层而获得吸附剂。关于造粒过程,推荐多种方法,但优选使用喷雾干燥法。根据喷雾干燥法,由磁芯颗粒作为原始粒子团聚得到的第二团聚体的平均直径可以通过调整喷雾干燥法中的环境温度和喷出速度来控制。此外当溶剂从第二团聚体中移走时,形成许多孔,使第二团聚体形成多孔结构,该结构适于作目标吸附剂。
喷雾干燥法可在任何装置上进行,但优选使用圆盘型装置、加压喷嘴型装置或双流体类型装置。
当使用喷雾干燥法时,如上所述,制备给定溶剂,聚合物或粉状的氧化物溶于溶剂,同时磁芯颗粒分散在该溶剂中。然后,适当地控制喷出速度等条件,喷出得到的溶液(浆液),这样,聚合物或氧化物在磁芯颗粒上形成吸附层从而获得目标吸附剂。
另一方面,在偶联剂或偶联剂的缩合产物形成吸附层的情况下,磁芯颗粒的表面经过偶联剂处理获得上述吸附剂。
喷雾干燥法中采用的溶剂优选极性溶剂。由于极性溶剂具有优异的亲水性,磁芯颗粒或在磁芯颗粒上形成的氧化物的表面上存在相对少量的对溶剂具有亲合力的羟基,这样,磁芯颗粒或氧化物不团聚并且均匀地分散在溶剂中,因此,由于吸附剂成分变得均匀,考虑吸附剂是否适于有机聚合物的吸附时,仅需要考虑吸附剂的尺寸。
在聚合物形成吸附剂情况下,由于聚合物单独溶解在溶剂中,如果磁芯颗粒对溶剂具有亲合力,吸附剂的组成必定是均匀的。
因此,吸附剂的质量通过使用分类选择决定,无需复杂操作,诸如成分分析。
在该实施方案中,“亲水性”是指与水自由混合,具体地,是指这样一个状态,在20℃温度,1大气压下,纯水和给定溶剂以相同的数量彼此混合,获得的混合溶液在混合溶液静止时维持视觉均匀的状态。
作为极性溶剂,举例有甲醇,乙醇,正丙醇,异丙醇,丙酮和四氢呋喃。优选使用丙酮和四氢呋喃,因为该亲水的溶剂可以溶解各种聚合物。
在该实施方案中优选的吸附剂的平均直径在5μm~1mm范围内,优选在10μm~100μm范围内。如果吸附剂平均直径在上述范围内,外部的磁力可以作用于吸附剂磁芯颗粒上,从而可以利用外部磁力有效地分离和回收有机聚合物,这将在下面描述。
(有机聚合物回收)接着,一种与使用上述吸附剂回收有机聚合物方法有关的实施方案。具体地,下面将描述在机械加工方法中,从含切削剂和润滑油的废水中仅分离并移除润滑油(差的水溶性的第二有机聚合物),然后获得的溶液再利用。
图1是用于说明该实施方案中回收方法的流程图。首先,零件被机械加工,具体地,准备切削工艺(步骤S1)。被加工的零件适当地由SUS或类似结构构成。然后,被加工的零件安置到加工设备中,具体地,在本实施方案中,安置到相应的切削机中,从而用于切削加工。此时,给驱动部分提供润滑油,如加工设备的齿轮,同时,将切削剂用于加工的零件(步骤S2)。
可用的润滑油是市场上可买到的矿物油。切削剂可以举例有乳状液类型;可溶解型或溶液型切削剂,相应为日本工业标准代码“A1”、“A2”或“A3”。分类为日本工业标准代码“A1”的乳状液类型和可溶解型严格地不具有良好的水溶性,但是,考虑它与矿物油等相比在某种程度上具有良好的水溶性,基于这种观点,在本实施方案中乳状液类型切削剂及其类似物作为具有良好的水溶性的有机聚合物处理。
然后回收用过的润滑油和切削剂(废水)并储备在容器中(步骤S3)。在本实施方案中,上述方法获得的吸附剂浸入容器以吸附润滑油,并利用磁力方法从废水中分离回收(步骤S4)。注入吸附剂的量取决于润滑油的浓度和吸附剂的性能,但优选为润滑油量的一到十倍的范围内。吸附剂吸附润滑油时,需要进行适当搅动以增加润滑油和吸附剂的接触时间。
从废水中磁力分离吸附剂时,例如,来自电磁体或永磁体的磁力将吸附剂固定在容器中,同时允许残余溶液离开容器和容器中的吸附剂,从而,从废水中磁力分离吸附剂。
如上所述,从废水中回收吸附剂后,获得含切削剂的溶液。该溶液是允许离开容器的残余溶液。将该溶液储备在水槽中作为备用。
如上所述,在本实施方案中,采用吸附剂除去废水中的润滑油,溶液中几乎不含润滑油。因此,在溶液中润滑油对切削剂的污染概率可以极度降低。基于这种观点,包含切削剂的溶液可以再用作为上述切削加工中的切削剂(步骤S5)。
同时,在如上所述分离和除去之后,吸附润滑油的吸附剂经过预定溶剂洗涤,以从吸附剂上分离和除去润滑油(步骤S6)。用于洗涤吸附剂并且不溶解吸附层的溶剂由聚合物等类似物构成,作为溶剂举例有,甲醇、乙醇、正丙醇、异丙醇、丙酮、四氢呋喃、正己烷、环己酮、异丁醇、异丙醚、二乙醚、二甲苯、氯仿、乙酸乙酯、醋酸丁酯、乙酸丙酯、乙酸甲酯、二噁烷、环己醇、环己酮、二丁醚、二甲基苯胺、四氢呋喃、甲苯、丁醇、氯氟烃、己醇、甲基异丁基酮和甲基乙基酮。
列举的溶剂中,特别优选非极性溶剂。因为非极性溶剂具有疏水性和高亲油性,吸附到吸附剂上的润滑油可以容易地并有效地洗涤除去。此外,如果使用非极性溶剂,容易分离和除去受损坏的吸附剂。这里,“疏水性”是指水溶解度是10%或更少,并且目标物质如溶剂从水中分离。特别优选正己烷,因为正己烷具有大约70℃的较高沸点,可以呈现高油溶性并在室温下为稳定的液体。
在润滑油经过溶剂洗涤并从吸附剂中除去之后,包含润滑油的溶液(分散介质)可以废弃,但考虑到保护环境,将润滑油从溶液(分散介质)中分离,这样仅剩溶液可以回收。在分离过程中,可以使用蒸馏。分离回收的润滑油经过适当的燃烧作为热源,经过蒸馏分离的溶剂可以再利用到吸附剂和润滑油分离过程。
在从吸附剂上除去润滑油后,从吸附剂上移除用于吸附剂洗涤过程的溶剂(步骤S7)。可以利用溶剂置换(如,用水)或干燥除去溶剂。特别地,优选干燥法除去溶剂。干燥过程可在通风良好的气氛,减压气氛或通风的气氛中进行。在通风良好的气氛中干燥可通过将吸附剂进料到塔中进行。
此时,如果采用分离过程中分离的润滑油的燃烧热,该用过的润滑剂优选再利用。在这种情况下,可以将吸附剂的温度设到低于吸附层软化点的温度来阻止吸附剂受损,该吸附层由聚合物或类似物制成。优选,将吸附剂的温度设置在这样一个温度,使溶剂蒸汽压为40mmHg或更低。
实施例
(实施例1)<生产吸附剂>由138重量份的聚甲基丙烯酸甲酯溶解于2400毫升丙酮中形成混合溶液,并且1500重量份由平均直径为2000nm的八角磁铁矿分散在溶液中。获得的溶液(分散介质)使用微型喷雾干燥器(B-290型,S1BATA SCIENTIFIC TECHNOLOGY LTD.生产)喷雾以形成平均直径40μm的树脂团聚体,即,团聚成球体形式的吸附剂。
(吸附油)然后,制备包含1000ppm聚乙烯醇和10000ppm二乙醇胺的第一溶液,作为水溶性切削剂,并且制备包含1000ppm机油(benison缝纫机油B-111,Red camelliaCo.,Ltd.生产)的第二溶液。然后第一溶液与第二溶液混合以模拟废水。20ml的模拟的废水放进烧杯,向烧杯中加入2000ppm的上述生产的吸附剂,混合3分钟。
<吸附剂分离>使用磁铁将吸附剂从模拟废水中取出后,相等于废水量的20ml正己烷加入吸附剂,从中萃取油。使用GC/MS集中分析模拟废水,结果是,95%的油(机油)从模拟废水中移除。在这种情况下,水溶性切削剂的浓度不变。
<洗涤吸附剂>20ml的己烷加入到从模拟废水中取出的吸附剂中,洗涤吸附剂。然后用GC/MS集中分析洗涤后的己烷溶液,结果是,己烷溶液包含几乎所有量的95%的作为机器润滑油的benison缝纫机油。此外,己烷溶液中未检测到水溶性切削剂。洗涤过的吸附剂在干燥器中,在60℃下干燥30分钟然后回收。
结果证明了,即便吸附剂吸附过机油,这些吸附剂在用正己烷洗涤后仍能够再利用。同样,证实了,模拟废水除去了机油,仅起水溶性切削剂作用的聚乙烯醇和二乙醇胺留在模拟废水中,该聚乙烯醇和二乙醇胺,即,水溶性切削剂没有受到机油的污染,水溶性切削剂同样可以再利用。
(实施例2)在本实施例中,吸附剂的生产方法不同于实施例1,而吸附操作等与实施例1相同。
也就是说,制备磁性颗粒(平均直径为1μm)并且通过洗涤磁性颗粒表面在磁性颗粒上形成羟基。具体地,将磁性颗粒加入乙醇,在室温下搅动并在500rpm离心3分钟。除去上层清液,然后,用超纯水采用和乙醇一样的方法洗涤磁性颗粒三次。此后在100℃下干燥30分钟以完全除去包含在磁性颗粒中的水分。净化后的磁性颗粒(7g)放进包含聚乙烯基吡咯烷酮(20mg)的水(350ml)中,搅动。
然后,通过倾滤从水中除去水组分,并且向磁性颗粒中加入100ml乙醇混合形成分散介质。此外,向分散介质中加入氨水(25%,10ml),再向分散介质中加入四乙氧基硅烷(TEOS,70mg)并搅动12小时。反应后,通过倾滤从分散介质中移走乙醇溶剂。然后,再一次向分散介质中残留的磁性颗粒中加入乙醇并用倾滤除去。剩余的磁性颗粒在50℃干燥形成吸附剂。
润滑油吸附操作等使用吸附剂以与实施例1中相同的方式进行。结果是98%量的作为机油的benison缝纫机油从包含1000ppm benison缝纫机油的溶液中得到回收。而且,溶液中水溶性切削剂的浓度不变。当采用正己烷洗涤溶液分离吸附剂时,结果是通过洗涤获得的正己烷溶液包含几乎所有量的98%的作为机油的benison缝纫机油。此外,正己烷中没有检测出水溶性切削剂。洗涤过的吸附剂在60℃下干燥30分钟后回收。
结果证明了,即便吸附剂吸附机油之后,这些吸附剂在使用正己烷洗涤后能够再利用。同样,证实了,模拟废水除去了机油,仅起水溶性切削剂作用的聚乙烯醇和二乙醇胺留在模拟废水中,该聚乙烯醇和二乙醇胺,即,水溶性切削剂没有受到机油的污染,水溶性切削剂同样可以再利用。
(实施例3)在本实施例中,水溶性切削剂由聚乙烯醇和二乙醇胺换成SUGICUTCE-14GA(Sugimura化学品工业有限公司生产),而吸附剂生产与实施例1中相同,吸附操作等与实施例1相同。结果是,95%的作为机油的benison缝纫机油从包含1000ppm benison缝纫机油的溶液中得到回收。此外,溶液中水溶性切削剂的浓度不变。当采用正己烷洗涤溶液分离吸附剂时,结果是洗涤过的正己烷溶液包含几乎所有量的95%的作为机油的benison缝纫机油。此外,正己烷溶液中没有发现水溶性切削剂。洗涤过的吸附剂在60℃下干燥30分钟后回收。
结果证明了,即便吸附剂吸附机油之后,这些吸附剂在使用正己烷洗涤后能够再利用。同样,证实了,模拟废水除去了机油,仅起水溶性切削剂作用的SUGICUT CE-14GA留在模拟废水中,该SUGICUT CE-14GA,即,水溶性切削剂没有受到机油的污染,水溶性切削剂同样可以再利用。
当某些实施方案已经描述过时,这些实施方案仅以举例方式呈现,并不限制本发明的保护范围。实际上,此处描述的新方法可以概括成多种其它形式;此外,此处描述方法的各种省略、置换和形式上的改变不脱离本发明的精神。附加权利要求及其等价物意图覆盖落入本发明范围和精神的这些形式或修改。
例如,上述实施例中举例将切削剂作为具有良好的水溶性的有机聚合物,但其它具有良好的水溶性的有机聚合物,如水溶性聚糖、胺、醇可以作为本发明的例证。类似地,举例将润滑油作为具有差的水溶性的有机聚合物,但其它具有差的水溶性的有机聚合物,如动物油脂、烃类、石油芳烃可以作为本发明的例证。
Claims (15)
1.一种回收有机聚合物的方法,包括:
添加吸附剂到包含具有良好的水溶性的第一有机聚合物和具有差的水溶性的第二有机聚合物的废水中以吸附第二有机聚合物,每个吸附剂由磁芯颗粒和在磁芯颗粒上形成的吸附层组成;
通过磁力分离从废水中回收带有吸附剂的第二有机聚合物,从而获得包含第一有机聚合物的溶液;
再利用该溶液;
其中,每个磁芯颗粒的尺寸设置在0.05μm到100μm范围内。
2.根据前述权利要求1的方法,其中,吸附层包含选自以下组中的至少一种:苯乙烯聚合物、氢化苯乙烯聚合物、丁二烯聚合物、异戊二烯聚合物、丙烯腈聚合物、环烯烃聚合物、烷基丙烯酸酯聚合物、苯酚聚合物和烷基甲基丙烯酸酯聚合物。
3.根据前述权利要求1的方法,其中,吸附层包含偶联剂。
4.根据前述权利要求1的方法,其中,吸附层包含偶联剂的缩合产物。
5.根据前述权利要求3的方法,其中,偶联剂是硅烷偶联剂。
6.根据前述权利要求4的方法,其中,偶联剂是硅烷偶联剂。
7.根据前述权利要求1的方法,其中,吸附层包含氧化物。
8.根据前述权利要求7的方法,其中,氧化物是包含选自以下组中的至少一种的氧化物:Si、Ti、Zr、Al、Zn、Ba、Sn、W、Mo、Cr、In、Sb、Co、Fe、Nb、Pb、Yb、La、Re、Sr、Th和Ta。
9.根据前述权利要求1的方法,其中,磁芯颗粒包含铁氧体基化合物。
10.根据前述权利要求1的方法,其中,吸附剂通过喷雾干燥制成。
11.根据前述权利要求10的方法,其中,喷雾干燥采用极性溶剂进行。
12.根据前述权利要求1的方法,其中,每个吸附剂的尺寸设置在5μm~1mm范围内。
13.根据前述权利要求1的方法,其中,溶液通过使用预定溶剂洗涤后再利用。
14.根据前述权利要求13的方法,其中,溶剂是选自以下组中的至少一种:甲醇、乙醇、正丙醇、异丙醇、丙酮、正己烷、异丁醇、异丙醚、二乙醚、二甲苯、氯仿、乙酸乙酯、醋酸丁酯、乙酸丙酯、乙酸甲酯、二噁烷、环己醇、环己酮、二丁醚、二甲苯胺、四氢呋喃、甲苯、丁醇、氯氟烃、己醇、甲基异丁基酮和甲基乙基酮。
15.根据前述权利要求1的方法,其中,第一有机聚合物是切削剂,而第二有机聚合物是油,其中废水是使用切削剂和油的机械加工中产生的废油。
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JPS53123560A (en) * | 1977-04-05 | 1978-10-28 | Satoru Tachihara | Method of treating flown oil and oil contained drainage by solid particles coated with synthetic resin |
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