CN102203322A - 用于抑制水介质中的腐蚀的组合物和方法 - Google Patents

用于抑制水介质中的腐蚀的组合物和方法 Download PDF

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CN102203322A
CN102203322A CN2009801437925A CN200980143792A CN102203322A CN 102203322 A CN102203322 A CN 102203322A CN 2009801437925 A CN2009801437925 A CN 2009801437925A CN 200980143792 A CN200980143792 A CN 200980143792A CN 102203322 A CN102203322 A CN 102203322A
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R·克罗维托
C·C·皮尔斯
P·D·德克
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Abstract

本发明提供用于诸如冷却水体系的水体系的腐蚀抑制处理的方法和组合物。所述方法包括对所述水体系结合使用诸如Al或Mn的多价金属离子和腐蚀抑制剂/沉积控制剂(DCA)。所述腐蚀抑制剂DCA可为诸如羟基酸、膦酰基羧酸、聚羟基丁二酸、或聚马来酸或酸酐的有机化合物。

Description

用于抑制水介质中的腐蚀的组合物和方法
发明领域
本发明涉及处理水体系以减少与其接触的金属表面上的腐蚀,其中限制有机抑制剂的用量以帮助减少处理的碳足迹(carbon footprint)。
发明背景
数年来,诸如麻点的腐蚀和伴随影响的问题困扰着水体系。例如,水垢倾向于积聚在各种水体系的内壁上,由此大大降低体系的操作效率。以此方式,严重妨碍特定体系的传热功能。
腐蚀是金属与其环境的降解性电化学反应。腐蚀将精炼金属回复到其天然状态。例如,铁矿石为氧化铁。氧化铁被精炼成钢。当钢腐蚀时,形成氧化铁,如果未加以注意,其可导致金属故障或破坏,引起特定水体系停止运转,直到进行必要的修复为止。
通常,在冷却水体系中,已经证明腐蚀以及麻点损害体系的总效率。许多冷却水体系在体系处理中使用正磷酸盐来促进与体系水接触的金属表面的钝化。然而,基于磷的抑制剂的当前成本猛涨,这是由于农业肥料对于P2O5矿石的需求增加。并且,美国和欧洲的环境法规已经对排放到当地河流中的磷酸盐提高了限制。
因此,已经注意到低磷酸盐或无磷酸盐处理方法的用途日益增加,同时强调所有或主要有机处理方法通常需要比较高的有效处理用量(即>50ppm)。令人遗憾的是,这些高水平的有机处理用量增加了体系中的生物食物(碳足迹)且增加了向体系供给毒性杀生物化合物的需要。
可以从两个不同的观点来看碳足迹减少的益处。首先,可以从节约能量消耗来看碳足迹减少,否则,将需要合成有机抑制剂。在此,需要产生的较低量的有机物质产生较少废物、较少排放等。
其次,供生物生长用的食物产生减少,导致控制微生物活性所需的杀生物剂的进料量减少。
发明概述
本发明涉及抑制与诸如冷却水体系的水体系接触的金属的腐蚀的方法,其包括向水体系中加入多价金属离子和有机腐蚀抑制或沉积控制剂化合物。在一个优选的实施方案中,所述多价金属离子选自Al和Mn。
在本发明的一个实施方案中,所述腐蚀抑制/沉积控制剂(DCA)化合物可选自羟基酸、膦酰基羧酸、聚羟基丁二酸和聚马来酸或聚马来酸酐。
所述多价金属盐在水体系中的存在量可为约0.1-10ppm,有机腐蚀抑制剂/DCA化合物的存在量为约1至小于50ppm。与当前使用的许多全有机或有机/低磷酸盐处理相比,有机腐蚀抑制剂/DCA化合物的这种低用量有助于改善处理的碳足迹。
还提供了包含多价金属离子和腐蚀抑制/DCA化合物的水基组合物,其中提供约1份多价金属离子比约0.1-500份腐蚀抑制剂/DCA的摩尔比。
发明详述
我们已经发现使用诸如Al和Mn的多价金属离子显著降低提供对诸如工业冷却塔的水体系中的有效腐蚀和处置控制所必须的羟基酸、膦酰基羧酸、聚烷基羟基丁二酸和聚马来酸或酸酐的浓度。
本发明的一方面,提供抑制水体系中金属腐蚀的方法,其中将多价金属离子和腐蚀抑制或沉积控制剂(DCA)化合物加到所述体系中。在一个特定的实施方案中,加入约0.1-10ppm的多价金属离子,腐蚀抑制剂的进料量为约1至小于50ppm。这些进料量突出了本发明的一个特点,即,腐蚀抑制剂/DCA的“碳足迹”由于由本发明的降低的用量水平而得到改善。也就是说,对于腐蚀抑制剂/DCA,可使用低于正常或传统的进料水平。
关于可使用的多价金属离子,在一个实施方案中,这些多价金属离子可选自Mn+2、Ni+2、Al+3和Sn+2。优选所述离子选自Al和Mn。Al和Mn离子可使用的示例性盐包括氯化锰、硝酸锰、乙酸锰和硫酸锰铵。示例性铝盐包括乙酸铝、溴酸铝、溴化铝和其六水合物和五水合物、氯酸铝、柠檬酸铝、氯化铝和其六水合物、氟化铝、碘化铝和六水合物、乳酸铝、硝酸铝、硫酸铝和其水合物。
关于可加入的腐蚀抑制剂/DCA化合物,其包括羟基酸、膦酰基羧酸、聚羟基丁二酸和聚马来酸或酸酐。在一个具体的实施方案中,所述羟基酸由下式表示:
Q-(R1)a-(R2)b-(R3)c-COOH
其中a、b和c为约1-6的整数,条件是(a+b+c>0);R1、R2和R3为以无规或嵌段链序的重复单元且分别选自C=O或CYZ,其中Y和Z分别选自H、OH、CHO、COOH、CH3、CH2OH、CH(OH)2、CH2(COOH)、CH(OH)(COOH)、CH2(CHO)和CH(OH)CHO,使得所述B1具有如在其完全水合形式中所书写的最少一个OH基团。式中的Q为COOH或CH2OH。在另一实施方案中,所述羟基酸选自黏酸、D-葡糖二酸、酮基丙二酸、酒石酸和柠檬酸。优选D-葡糖二酸。
也可将膦酰基羧酸用作腐蚀抑制剂/DCA,腐蚀抑制剂/DCA待与多价金属离子结合使用。本发明的一方面,这些膦酰基羧酸可选自膦酰基丁二酸低聚物、膦酰基丁二酸和下式的调聚膦酰基多羧酸:
Figure BPA00001358332000031
其中m为约2-7、优选为2-3、最优选平均为2-5。
在一个实施方案中,所述膦酰基羧酸包含如下膦酰基丁二酸
Figure BPA00001358332000032
与上述调聚膦酰基多羧酸的混合物,其中m为约2.5。该混合物可以商标Bricorr288从Rhodia购得。该产品据说为60%膦酰基丁二酸和40%调聚化合物。
关于上述膦酰基丁二酸低聚物(PSO),其具有式
Figure BPA00001358332000041
该化合物在美国专利6,572,789,式2,第5栏中报道。如在该专利中所报道,PSO通过向马来酸或富马酸的水性浆液或悬浮液中加入次磷酸盐以产生反应混合物、接着加入自由基引发剂来制备。典型的浆液具有约35-50%重量的固含量。
任选可将反应混合物在约40℃-约78℃下加热,接着加入次磷酸盐以使反应物转化为所要的膦酰基丁二酸加成物。反应混合物可用诸如NaOH、KOH、NH4OH等的碱部分或完全中和。
示例性自由基引发剂包括过硫酸盐、过氧化物和重氮化合物。优选的引发剂为过硫酸铵。基于次磷酸盐的存在量计算,引发剂的存在量可为约10-15%摩尔。
‘789专利还报道了如果反应用富马酸(反式1,4-丁烯二酸(butanedioic acid))进行,则与马来酸(顺式1,4-丁烯二酸)相比,双加成物(上述PSO)的形成得到促进。
在本发明的另一方面,所述腐蚀抑制剂/DCA为具有下式的聚羟基丁二酸或衍生物:
Figure BPA00001358332000051
其中Z1为选自-O-、-NH-和二氨基亚二甲苯基的二价基团,n为1-约5的整数,M为H或阳离子,且R4各自独立地选自H、C1-C4烷基或C1-C4被取代的烷基。
在一个实施方案中,所述聚羟基丁二酸为具有下式的聚环氧基丁二酸(PESA):
其中n为2-3。
PESA在美国专利5,236,332和4,654,159中有描述,两个专利通过引用结合到本文中。PESA通常被描述为多元酸。虽然,主要作为沉积控制剂(DCA)加到冷却水化学中,但已经承认该化学提供某种适度的腐蚀益处。然而,与所述多价金属离子相组合,所得腐蚀抑制性质大于基于其单独使用可以预想到的性质。
在本发明的另一方面,所述聚羟基丁二酸为具有下式的氨羟基丁二酸(ammonia hydroxysuccinic acid):
Figure BPA00001358332000061
Ammonia(AM-HAS)。该组分根据美国专利5,183,590中报道的方法制得。
另一示例性聚羟基丁二酸为具有以下通式的对亚二甲苯基-HSA:
Figure BPA00001358332000062
该化合物根据美国专利5,183,590中陈述的方法制得。
在本发明的另一实施方案中,可将聚马来酸(PMA)或其酸酐作为腐蚀抑制剂/DCA结合多价金属离子使用。非常令人惊讶的是,我们已经发现在水介质中聚合的PMA比在诸如甲苯或二甲苯的有机溶剂中聚合的PMA好得多。例如,根据本发明可用作腐蚀抑制剂/沉积控制剂(DCA)的PMA可在水溶液中在诸如铁、钒和/或铜的金属离子存在下用过氧化氢作为催化剂由马来酸单体聚合。根据本发明的一种示例性水成PMA为得自SNF的分子量为约630的PMA 2A。其它水成PMA包括自Akzo Nobel得到的Aquatreat 802,MW≈640;和从江苏江海得到的水基PMA。水成PMA因此定义为已经在水介质中聚合的PMA。
根据本发明的组合物包括优选在水溶液或悬浮液中的多价金属离子和腐蚀抑制剂/DCA的组合。一般来说,所述多价金属盐∶腐蚀抑制剂DCA在这类组合物中以约1份多价金属离子比约0.1-5,000份腐蚀抑制剂的摩尔范围存在。
包括以下实施例作为本发明的说明,不应该将其视为限制本发明的范围。
实施例
腐蚀试验使用烧杯腐蚀试验设备(Beaker Corrosion Test Apparatus,BCTA)进行。该试验评价在120℉的温度下低碳钢电极在水中经18小时时间的腐蚀。水化学通过加入可溶性硬度盐、二氧化硅和碱性物质来改变以模拟工业冷却塔的水化学。通常,水化学包括:
Ca    400ppm,以CaCO3形式
Mg    150ppm,以CaCO3形式
SiO2  30ppm,以SiO2形式
Cl    283ppm,以Cl形式
SO4   450ppm,以SO4形式
M-碱度(M-alkalinity)200ppm,以CaCO3形式。
在开始BCTA试验之前将水的pH调整到8.0并在试验期间使其偏移。通常,pH值经试验过程从8.4上升到8.6。
由这些试验产生并示于下表中的数据包括在18小时实验结束时取得的暴露于这些水中的低碳钢试验试片的通过电化学线性极化扫描得出的适度的钢腐蚀速率和腐蚀外观等级。对于试片外观的等级评分为:
等级 试片外观
0 完美;没有麻点
1 瑕疵
2 1或2个麻点
3 3个或更多个麻点
4 4个或更多个麻点
5 5个或更多个麻点
6 中度麻点密度(30%覆盖率)
7 中度麻点密度(50%覆盖率)
8 中度麻点密度(70%覆盖率)
9 重度麻点密度(80%覆盖率)
10 重度麻点密度(>90%覆盖率)
认为2或更大的试片外观等级是不可以接受的。
实施例1
实验处理
Al 0.5-对葡糖二酸(SA)浓度的影响
Ca 250,Mg 100,Malk 175,4分散剂I,8PESA,0.6PO4
PESA=聚环氧基丁二酸;分散剂I=丙烯酸/烯丙基羟基丙基磺酸盐醚共聚物(AA/AHPSE)-美国专利4,717,499。
实施例1中的数据表明向不同浓度的葡糖二酸中加入0.5Al如何显著降低腐蚀速率并改善金属表面的外观。在该具体实施例中,在SA/Al=20/0.5组合下实现可接受的性能。在不存在Al的情况下,需要30ppm的葡糖二酸来实现可接受的性能。
表1:Al对葡糖二酸的影响
Figure BPA00001358332000081
实施例2
Al和Mn-对葡糖二酸(SA)浓度的影响
Ca 400,Mg 150,SiO2 30,Malk 200,4-8(分散剂I或II),8PESA,1 PO4
分散剂II=丙烯酸/烯丙基聚乙氧基硫酸铵共聚物(AA/APES)-美国专利7,094,852。
表2的数据表明加入低浓度的Al和Mn如何影响提供可接受性能所需要的葡糖二酸的浓度。在该具体实施例中的这些实验条件下,在SA/Al=25/0.25且SA/Mn=25/05组合下实现可接受的性能。在不存在如Al或Mn的二价金属离子的情况下,需要35ppm葡糖二酸实现可接受的性能。
表2:Al和Mn对葡糖二酸的影响
Figure BPA00001358332000091
实施例3
Al-对不同羟基酸的影响
Ca 4O0,Mg 150,SiO2 30,Malk 200,4-8(分散剂I或III),8 PESA。
分散剂III=丙烯酸/烯丙基羟基丙基磺酸盐醚/烯丙基聚乙氧基硫酸铵三元共聚物(AA/AHPSE/APES)-美国专利7,094,852。
表3中的数据表明加入二价金属离子如何影响提供可接受性能所需要的羟基酸的浓度。
表3中的实施例3_1至3_5表明用100ppm的低聚合度(DP 2-3)的聚(环氧基丁二酸)可实现优良的性能。使用0.5ppm Al可将该物质的碳足迹减少到25ppm,碳足迹贡献(carbon footprint contribution)降低了75%。
表3中对于对亚二甲苯基-HSA(pX-HSA)的实施例3_6至3_12表明在80ppm下可获得优良的性能。或者,对于pX-HSA/Al=20/1或10/2可得到优良的性能,即碳足迹贡献降低了75-88%。实施例3_13至3_15Ammonia-HSA(AM-HSA)在AM-HSA/Al=20/0.5下与pX-HSA等效。
表3中对于PSO的实施例3_16至3_17表明实现处理效果需要>40ppm的浓度。相比之下,对于PSO/Al=40/0.5加入0.5Al得到优良的性能,相当于碳足迹贡献降低了>50%。
在Bricorr 288的情况下,表3的实施例3_18至3_19表明在有机物/Al=3/0.5的比率下可实现可接受的性能,碳足迹贡献降低了70%。
对于化合物VI(葡糖酸),即使在有机抑制剂/Al比率为40/0.5ppm下,性能也是不可接受的,因此从优选化合物的列表中排除该物质。
表3:Al对羟基酸的影响
其中:
I    PESA DP2
II   p-亚二甲苯基-HSA(pX-HSA)
III  Ammonia--HSA(AM-HSA)
IV   膦酰基丁二酸低聚物(PSO)
V    Bricorr 288
VI   葡糖酸
VII  葡庚糖酸
实施例4
Al-对不同聚马来酸的影响
Ca 400,Mg 150,SiO2 30,Malk 200,4-8(分散剂I或III),8 PESA,1 PO4
表4中的数据表明加入二价金属离子如何影响提供可接受性能所需要的聚马来酸的浓度。表4的实施例4_1、4_2和4_3表明增加体系中有机抑制剂的含量改善性能的一般趋势;然而,实现处理效果需要>20ppm的浓度。相比之下,加入0.5Al以使PMA/Al=10/0.5得到优良的性能,相当于碳足迹贡献降低了>50%。
表4的实施例4_7至4_15表明在PMA/Al比率=15/0.5下在不加入PESA(一种专用水垢和腐蚀抑制剂)的情况下所有聚马来酸都给出了可接受的腐蚀保护作用。
表4:Al对聚马来酸的影响
Figure BPA00001358332000111
其中
I     PMA2A-水成PMA;MW≈630,SNF
II    Aquatreat AR-802-水成PMA;MW≈640-Akzo Nobel
III   Acumer 4210-基于有机溶剂的PMA-Rohm&Haas,MW≈860
IV    Belclene 200-基于有机溶剂的PMA-Houghton Chemical,MW≈680
实施例5
BTU:向不同聚马来酸中加入Al的影响
Ca 400,Mg 150,SiO2 50,Malk 200,pH 8.6,8分散剂III,1 o-PO4,0.3-0.5ppmAl-0.2ppm残留氯
在再循环冷却水条件下对这些聚马来酸的进一步试验表明在这些物质中存在显著的性能差别。如表5中所示,出乎意料的结果是在水介质中合成的聚马来酸提供优良的处理功效,而在溶剂介质中合成的聚马来酸却没有提供这样的处理功效。
表5
Figure BPA00001358332000121
本发明的一方面,优选的处理为:
DCA-PMA;Aquatreat 802-Akzo Nobel-20-25ppm;
Al盐-0.3-0.5ppm;
磷酸盐-0.1-1ppm(最大);
聚合物分散剂-I、II或III
在没有使用来自补给水(MU)的自然污染的1ppm PO4(即≈在MU中的0.2ppm×5次操作循环=在水塔中的1ppm PO4)的情况下,该优选的组合没有很好地工作。来自任何来源的磷酸盐在水体系中通常都转化为正磷酸盐。
因此,在本发明的另一方面,将所要的处理用于其中具有残余磷酸盐的类型的冷却水中,残余磷酸盐在再循环时的存在量可为约0.1-1.0ppm。
另外,诸如丙烯酸和丙烯酸与丙烯酸低级烷基酯和丙烯酸羟基化低级烷基酯的共聚物可作为示例给出。例如,可提到丙烯酸/丙烯酸2-羟基丙酯共聚物。另一示例性类型为丙烯酸/烯丙基醚共聚物和三元共聚物,诸如丙烯酸/烯丙基羟基丙基磺酸盐醚和丙烯酸/烯丙基聚乙氧基硫酸铵共聚物和三元共聚物。具有丙烯酸的丙烯酰胺和N-烷基丙烯酰胺均聚物或共聚物也可作为有效物而提到。这些聚合物分散剂的存在量可为约2-25ppm、优选为约4-8ppm。
虽然已经关于本发明的特定实施方案描述了本发明,但是很明显本领域技术人员将显而易见本发明的许多其它形式和改进。通常将附加权利要求书和本发明视为涵盖在本发明的真实精神和范围的所有这类显而易见的形式和改进。

Claims (29)

1.抑制与水体系接触的金属的腐蚀的方法,其包括向所述水体系中加入:a)多价金属离子;和b)腐蚀抑制或沉积控制剂(DCA)化合物。
2.权利要求1的方法,其中所述多价金属离子包含选自Al和Mn的成员。
3.权利要求1的方法,其中所述腐蚀抑制/DCA化合物为选自B1羟基酸、B2膦酰基羧酸、B3羟基丁二酸和B4聚马来酸或聚马来酸酐的成员。
4.权利要求3的方法,其中所述多价金属盐A的存在量为约0.1-10ppm,所述腐蚀抑制剂B的存在量为约1至小于50ppm,且其中所述水体系为冷却水体系。
5.权利要求4的方法,其中B1存在且具有下式:
Q-(R1)a-(R2)b-(R3)c-COOH,
其中a、b和c为0-6的整数,条件是(a+b+c>0);Q为COOH或CH2OH;R1、R2和R3为以无规或嵌段链序的重复单元且分别选自C=O或CYZ,其中Y和Z分别选自H、OH、CHO、COOH、CH3、CH2OH、CH(OH)2、CH2(COOH)、CH(OH)(COOH)、CH2(CHO)和CH(OH)CHO,使得所述B1具有如在其完全水合形式中所书写的最少一个OH基团。
6.权利要求5的方法,其中所述羟基酸选自黏酸、D-葡糖二酸、酮基丙二酸、酒石酸和柠檬酸。
7.权利要求5的方法,其中所述羟基酸为葡糖二酸。
8.权利要求4的方法,其中所述B2存在且包括选自膦酰基丁二酸低聚物、膦酰基丁二酸和下式的调聚膦酰基多羧酸的成员:
Figure FPA00001358331900011
其中m为约2.5。
9.权利要求8的方法,其中所述膦酰基羧酸包含所述膦酰基丁二酸和所述调聚膦酰基多羧酸的混合物。
10.权利要求4的方法,其中B3存在且具有下式
其中Z1为选自-O-、-NH-和二氨基亚二甲苯基的二价基团,n为1-约5的整数,M为H或阳离子,且R4各自独立地选自H、C1-C4烷基或C1-C4被取代的烷基。
11.权利要求10的方法,其中所述B3为聚乙氧基丁二酸,其中两个R4均为H,Z1为-O-,M为H和n为2。
12.权利要求8的方法,其中所述B3为氨羟基丁二酸,其中两个R4均为H,Z1为-NH-,n为2且两个M均为H。
13.权利要求8的方法,其中B3为P二氨基亚二甲苯基(P diaminoxylylene)和羟基丁二酸,两个R4均为H,两个M均为H且N为2。
14.权利要求4的方法,其中B4存在且为已在水介质中制备的聚马来酸。
15.用于处理水介质的腐蚀抑制处理组合物,其包含:
(a)多价金属离子;和
(b)腐蚀抑制/DCA化合物。
16.腐蚀抑制处理组合物,其中所述多价金属离子选自Al和Mn,且其中所述腐蚀抑制/DCA化合物(b)为选自B1羟基酸、B2膦酰基羧酸、B3羟基丁二酸和B4聚马来酸或聚马来酸酐的成员,所述组合物存在于水介质中。
17.权利要求16的组合物,其中B1存在且具有下式
Q-(R1)a-(R2)b-(R3)c-COOH,
其中a、b和c为0-6的整数,条件是(a+b+c>0);Q为COOH或CH2OH;R1、R2和R3为以无规或嵌段链序的重复单元且分别选自C=O或CYZ,其中Y和Z分别选自H、OH、CHO、COOH、CH3、CH2OH、CH(OH)2、CH2(COOH)、CH(OH)(COOH)、CH2(CHO)和CH(OH)CHO,使得所述B1具有如在其完全水合形式中所书写的最少一个OH基团。
18.权利要求17的组合物,其中所述羟基酸选自黏酸、D-葡糖二酸、酮基丙二酸、酒石酸和柠檬酸。
19.权利要求18的组合物,其中所述羟基酸为葡糖二酸。
20.权利要求16的组合物,其中所述B2存在且包括选自膦酰基丁二酸低聚物、膦酰基丁二酸和下式的调聚膦酰基多羧酸的成员:
Figure FPA00001358331900031
其中m为约2.5。
21.权利要求20的方法,其中所述膦酰基羧酸包含所述膦酰基丁二酸和所述调聚膦酰基多羧酸的混合物。
22.权利要求16的方法,其中B3存在且具有下式:
Figure FPA00001358331900032
其中Z1为选自-O-、-NH-和二氨基亚二甲苯基的二价基团,n为1-约5的整数,M为H或阳离子,且R4各自独立地选自H、C1-C4烷基或C1-C4被取代的烷基。
23.权利要求22的组合物,其中所述B3为聚乙氧基丁二酸,其中两个R4均为H,Z1为-O-,M为H且n为2。
24.权利要求22的组合物,其中所述B3为氨羟基丁二酸,其中两个R4均为H,Z1为-NH-,n为2且两个M均为H。
25.权利要求22的组合物,其中B3为P二氨基亚二甲苯基,两个R4均为H,两个M均为H且n为2。
26.权利要求16的组合物,其中B4存在且为已在水介质中制备的聚马来酸。
27.改善具有约0.1-1.0ppm的正磷酸盐的水体系中的腐蚀抑制的方法,其包括向所述体系中加入:
a)约0.3-0.5ppm的多价金属离子;和
b)量为约1-25ppm的聚马来酸或酸酐。
28.权利要求27的方法,其中所述多价金属离子选自Al和Mn且其中所述聚马来酸或酸酐是基于水的。
29.权利要求28的方法,其还包括约2-25ppm的c)选自丙烯酸、丙烯酸共聚物、丙烯酰胺和N-烷基丙烯酰胺聚合物和共聚物的聚合物分散剂。
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