ITRODUCTION
acrylic weak acid cation exchange resin
Weakly Acidic Cation Exchange Resins“DIAIONtrade; series”
Weakly Acidic Cation Exchange Resins “DIAIONtrade; series” Characteristics
Weakly Acidic Cation Exchange Resin Chemical Structures
Characteristics
Applications of Weak Acid Cation Resin in Waste Treatment
Basic Properties of Weak acid cation resins
Applications of WAC Resins in Metal Removal
Role of Weak Acid Cation Resin in Water Treatment
Selectivity and kinetics of WAC resin
Advantages of WAC resin
Disadvantages of WAC resin
Applications of WAC resin
Operating tips for WAC plants
What are the chemical structures of Dow Cation Exchange Resins?
Cation Exchange Resins.
110 (111) Acrylic weak acid cation exchange resin
Application of 110 (111) Acrylic weak acid cation exchange resin
Water filtration of ion exchange resins
Conclusion
BIBLIOGRAPHY
ITRODUCTION
An improved process for cleaning weak acid cation exchange resin intermediates resulting in finished weak acid resins providing enhanced performance of mixed-bed water-treatment systems is disclosed. The cleaning process involves selected steam treatment during the manufacturing process of the resins and is applicable to weak acid cation exchange resins in general that are used as components in potable water treatment systems, such as cartridge-water-pitcher systems.
Acrylic resin coatings based on acrylic polymer film forming matter of synthetic resin coating, it is energy saving, low pollution of varieties of paint. At the same time, due to its excellent corrosion resistance and decoration properties, widely used in various industries, with the development of petrochemical industry in our country, in the development of coating industry in China, will have more and more important position. This is the main task of the design, for 3000 tons/year of acrylic resin coating factory design, its main content includes market application, formula design, equipment selection, safety production and the 'three wastes' treatment, the production cost estimate and factory floor plan, etc.
acrylic weak acid cation exchange resin
for the recovery, separation, and purification of pharmaceutically active compounds
Our company-Shandong Lukang Record Pharmaceutical Co., Ltd Resin Filiale the leading manufacturer of resin in China, who possesses more than 40 years history for exploiting and producing ion exchange and absorption resin of all kinds. Up to now we have reached the scale of producing 1500 tons of resin annually in more than 40 categories. Our product shares great fame in the market.
Weakly Acidic Cation Exchange Resins“DIAIONtrade; series”
The weakly acidic cation exchange resins have the carboxylic acid group (-COOH) as the exchange group. There are two kinds --- a methacrylic acid type and an acrylic acid type. The acrylic acid weakly acidic cation exchange resin is used for processing water with high carbonate hardness. The methacrylic acid type is used for purification of antibiotics and amino acids.
Weakly Acidic Cation Exchange Resins “DIAIONtrade; series” Characteristics
The weakly acidic cationic exchange resins have the chemical structures shown in the figures below with carboxylic acid groups (-COOH) as exchange groups. They show weak acidity like acetic acid, having the ability to exchange with bases such as NaOH and weak acid salts such as NaHCO3.
There are two kinds of chemical structures --- a methacrylic acid type and an acrylic acid type. This makes a difference for the degree of acidity of the exchange group. Because of this, the methacrylic acid type can be used at pH greater than about 5, while the acrylic acid type can be used at pH greater than about 4. Given this pH range restriction, use is restricted compared to a strongly acidic cation exchange resin. But as will be described later, the weakly acidic resin is easier to regenerate.
Weakly Acidic Cation Exchange Resin Chemical Structures
1)Methacrylic acid-based weakly acidic cation exchange resin |
2)Acrylic acid-based weakly acidic cation exchange resin |
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Characteristics
Since the carboxylic acid exchange group (-COOH) is driven toward the undissociated form in acidic solutions, the weakly acidic resin does not exchange with salts like NaCl and Na2SO4 in which a strong mineral acid would be formed. Thus equation (1) below shows the reverse reaction. Bases like NaOH and weak acid salts like NaHCO3 are exchangeable as shown in (2) and (3).
・R-COOH + NaCl larr; R-COONa + HCl (1)
・R-COOH + NaOH → R-COONa + H2O (2)
・R-COOH + NaHCO3 hArr; R-COONa + H2O + CO2 (3)
(R represents the ion exchange resin matrix.)
The adsorption strength (selectivity) of various ions on the weakly acidic cation exchange resin is generally analogous to that on the strongly acidic resin. Selectivity is higher for higher valence ions. However, the weakly acidic resin features very large selectivity for the hydrogen ion. This means that after the hydrogen ion is replaced by another cation, the resin can be easily regenerated --- returned to the R-COOH form --- using a chemical treatment (generally HCl or H2SO4 solutions). The required amount of the regeneration chemical is only sligh
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目录
介绍------------------------------------------------------------------------------------------------------------------------1
丙烯酸弱酸性阳离子交换树脂-----------------------------------------------------------------------------------1
弱酸性阳离子交换树脂,“DIAIONtrade;系列”-----------------------------------------------------------------1
弱酸性阳离子交换树脂,“DIAIONtrade;系列”特色----------------------------------------------------------1
弱酸性阳离子交换树脂化学结构------------------------------------------------------------------------------1
特点-----------------------------------------------------------------------------------------------------------------------2
弱酸性阳离子交换树脂的废物处理的应用-------------------------------------------------------------------2
弱酸阳离子树脂的基本性能---------------------------------------------------------------------------------------
丙烯酸弱酸阳离子树脂的金属切削应用-----------------------------------------------------------------
在水处理弱酸性阳离子交换树脂中的作用-------------------------------------------------------------------
选择性和丙烯酸弱酸阳树脂动力学------------------------------------------------------------------------------
丙烯酸弱酸阳离子交换树脂的优点-------------------------------------------------------------------------------
丙烯酸弱酸阳离子交换树脂的缺点-------------------------------------------------------------------------------
丙烯酸弱酸阳离子交换树脂的应用---------------------------------------------------------------------------
操作提示压克力弱酸性阳离子厂------------------------------------------------------------------------------
什么是道指阳离子交换树脂的化学结构?------------------------------------------------------------------
阳离子交换树脂。--------------------------------------------------------------------------------------------------
110(111)丙烯酸弱酸阳离子交换树脂-------------------------------------------------------------------
110(111)丙烯酸弱酸阳离子交换树脂的应用---------------------------------------------------------
离子交换树脂的水过滤-------------------------------------------------------------------------------------------
结论----------------------------------------------------------------------------------------------------------------------
文献目录----------------------------------------------------------------------------------------------------------------
1. 引言
用于清洁导致成品弱酸树脂提供混合床水处理系统的增强性能弱酸阳离子交换树脂的中间体的改进方法被披露。清洗过程中的树脂的制造方法包括选择蒸汽处理,适用于一般的弱酸阳离子交换树脂被用作饮用水处理系统,如墨盒 - 水 - 投手系统组件。
基于上形成的合成树脂涂层的物质丙烯酸聚合物薄膜丙烯酸树脂涂料,它是节能,品种涂料低污染。同时,由于其优异的耐蚀性和装饰性,广泛应用于各个行业,石化行业在我国的发展,涂料行业在中国的发展,将有越来越多的重要地位。这是设计的主要任务,3000吨/年丙烯酸树脂涂料工厂设计年,其主要内容包括市场的应用,配方设计,设备选型,安全生产,“三废”治理,生产成本估算,工厂平面图等。
丙烯酸弱酸性阳离子交换树脂
对于回收,分离,和其药学上的纯化活性化合物
我们公司 - 山东鲁抗立科药物化学有限公司树脂分公司树脂在中国,谁拥有超过40年的历史开发和生产各种离子交换与吸附树脂的领先制造商。到现在为止,我们已经达到了每年在40多个类别的生产1500吨树脂的规模。我们的产品的股票在市场上大出风头。
弱酸性阳离子交换树脂,“DIAIONtrade;系列”
弱酸性阳离子交换树脂具有羧酸基团(-COOH)作为交换基团。有两种---甲基丙烯酸类和丙烯酸类。丙烯酸弱酸性阳离子交换树脂用于具有高碳酸盐硬度处理水。甲基丙烯酸类型用于抗生素和氨基酸纯化。
弱酸性阳离子交换树脂,“DIAIONtrade;系列”特色
弱酸性阳离子交换树脂具有在图中与羧酸基团(-COOH)作为交换基团如下所示的化学结构。它们显示弱酸性像乙酸,具有碱如NaOH和弱酸的盐如碳酸氢钠交换的能力。有两种化学结构---甲基丙烯酸类和丙烯酸类。这使得为交换基的酸度的程度的差异。正因为如此,所述甲基丙烯酸类可在pH大于约5被使用,而丙烯酸类可以在pH高于约4.鉴于该pH范围的限制,使用的是比较强酸性阳离子交换树脂的限制更大用于。但是如后面将要描述的,弱酸性树脂更容易再生。
弱酸性阳离子交换树脂化学结构
1)基于酸甲基丙烯酸弱酸性阳离子交换树脂 |
2)丙烯酸系弱酸性阳离子交换树脂 |
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特点
由于羧酸交换基(-COOH)被朝向在酸性溶液中的非解离形式的驱动下,弱酸性树脂不具有像NaCl和Na2SO4盐,其中将形成强无机酸交换。下面从而公式(1)表示的逆反应。像像碳酸氢钠NaOH和弱酸的盐的碱是可交换所示(2)和(3)。
・R-COOH + NaCl larr; R-COONa + HCl (1)
・R-COOH + NaOH → R-COONa + H2O (2)
・R-COOH + NaHCO3 hArr; R-COONa + H2O + CO2 (3
(R表示离子交换树脂基体)。
各种离子对弱酸性阳离子交换树脂的吸附强度(选择性)是通常类似于在强酸性树脂。选择性更高的价离子高。然而,弱酸性树脂为特色的氢离子选择性非常大。这意味着氢离子被其它阳离子取代后,树脂能够容易地再生---返回到R-COOH的形式---使用化学处理(通常HCl或H 2 SO 4溶液)。所需的再生化学的量仅比理论化学当量为弱酸性树脂稍大。
弱酸性阳离子交换树脂的废物处理的应用
(作者:Peter迈尔斯,ResinTech公司1999年6月提出了在AEF会议)
弱酸阳离子树脂具有二价阳离子,特别是铜和镍的非常高的选择性。这使得他们从废水流中除去各种金属的理想人选。这种类型的离子交换树脂并没有被广泛的表面精加工工业中使用。这可能是一个有关如何弱酸阳离子树脂的工作缺乏了解造成的。本文讨论弱酸阳离子树脂的化学性质,并探讨了各种潜在的用途为从废水中除去金属。
弱酸阳离子树脂具有非常高的能力;的两倍强阳离子树脂和3-4倍,螯合树脂的。弱酸阳离子树脂具有二价阳离子比螯合树脂甚至更高的选择性,特别是在中性至碱性pH值。弱酸阳离子树脂具有相对较低的成本和具有更快的动力学相比,螯合树脂。
弱酸阳离子树脂的基本性能
弱酸阳离子树脂都是从丙烯酸类聚合物,与二乙烯基苯(DVB)交联的和与羧酸交换基官能化的。
弱酸阳离子树脂可作为凝胶型(微孔)或大孔类型(具有离散孔隙率)。丙烯酸类基体的主要的不饱和结构允许羧酸交换基团的非常高的浓度。弱酸阳离子
树脂具有任何离子交换材料的最高容量没有发明。移动离子浓度通常为至少4正常(相当于约16%的HCl),并可以在过量的5 N在一些特别高容量的实例。
交换基团的高浓度内部引起弱酸阳离子树脂交换为其它阳离子(很小)氢离子时非常显著膨胀。在再生过程中,树脂可以收缩到一半原来的大小,和/或膨胀到两倍大小。由于当树脂接触高碱性溶液,在温度大幅增加时(高达50100ordm;F温升氢形式 弱酸阳离子树脂的内部酸浓度至少等于16%的HCl。
弱酸阳离子树脂的金属切削应用
弱酸性阳离子树脂的金属切削应用
有在围绕一个电镀车间各个地方弱酸阳离子树脂的许多潜在用途。最明显的是现有的氢氧化物沉淀后系统。这里,一个弱酸性阳离子树脂可用于去除之前排出废物到下水道金属污染物的最后痕迹。
以下氢氧化物沉淀自许多金属形成氢氧化物时的pH值是非常高的,它通常是可取的降低pH值略微(左右6-8)之前的树脂。此pH值的降低也有助于防止交沉淀结垢的树脂。
虽然弱酸性阳离子树脂所用的氢气或在钠形式使用,钠形式通常是优选的,因为它产生稍微低的泄漏。当在钠形式时,树脂不依赖于维持过量的碱性物质,以
驱动中和反应。氢形式的树脂溶胀,因为它排出,从而可能导致保持所需的流速的问题。
氢型树脂的操作能力往往超出远低于1%,2当量/升与金属的泄漏。钠形式的能力是大约一半(记住,树脂尺寸加倍)并且泄漏通常小于0.1%。
在水处理弱酸性阳离子交换树脂中的作用
弱酸阳离子树脂起着水处理中起重要作用。它通常是从丙烯酸和二乙烯基苯(DVB)作为交联剂。制造,虽然有些厂家由甲基丙烯酸或它的衍生物,使其。它是在脱矿质植物的水除碱一种广泛使用的单元。弱酸性阳离子 树脂的在210克总容量/升以CaCO3比其它的离子交换树脂高。树脂再生用接近化学计量量的稀酸。因此,在再生过程中产生的废水是几乎中性。弱酸性阳离子 树脂在碱性pH范围内操作,并当转换成不同的形式表现出大的体积变化。因此,它被称为水处理工艺的主力。
弱酸(或弱碱)的树脂相对更有效地再生比其强酸或强碱的同行。它可以通过使用树脂的组合,以提高该方法的效率 - 弱酸阳离子树脂接着强酸树脂和
弱碱
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