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柠檬酸和氨基磺酸有一样的除垢功能吗?
来源:http://www.jnjrh.com 日期:2019-10-14 发布人:admin
柠檬酸又称枸橼酸,分子式为H3C6H5O7·H20,化学称号为3-羟基-3-羧基-1,5戊二酸或2-羟基丙烷-1,2,3—三羧酸,是富有柠檬的水果香味,易溶于水的晶体。
Citric acid is also known as citric acid. Its molecular formula is H3C6H5O7.H20. Its chemical name is 3-hydroxy-3-carboxyl-1,5-glutaric acid or 2-hydroxypropane-1,2,3-tricarboxylic acid. It is a crystal rich in citric fruit flavor and soluble in water.
柠檬酸是清洗过程中运用zui多的有机酸,它能够溶解氧化铁、氧化铜等锈垢,其作用原理是一方面应用H十离子与碱性的金属氧化物作用,另一方面是柠檬酸的络协作用(柠檬酸是剖析化学中常用的一种络合荫蔽剂)。它与铁锈生成的柠檬酸铁在水中溶解度小,所以在柠檬酸溶液中参加氨,俗称氮化柠檬酸,这时它就经过络协作用生成溶解度很高的柠檬酸亚铁铵和柠檬酸高铁铵复盐而到达进步去除氧化铁的效应。其反响过程为柠檬酸与氨水反响生成柠檬酸单铵盐,再发作络合反响。
Citric acid is a kind of organic acid which uses Zui more in cleaning process. It can dissolve rust scale such as iron oxide and copper oxide. Its principle is to use H 10 ion to react with alkaline metal oxides on the one hand, and citric acid to cooperate on the other hand (citric acid is a complex shading agent commonly used in analytical chemistry). It has a low solubility in water with iron citrate produced by rust, so it participates in ammonia in citric acid solution, commonly known as citric acid nitride. At this time, it synergizes to produce ammonium ferrous citrate and ammonium ferric citrate with high solubility through complexation and reaching the effect of progressive removal of iron oxide. The reaction process is that citric acid reacts with ammonia water to form monoammonium citrate, which reacts again.
H3C6H5O7+NH3=NH4H2C6H5O7(柠檬酸单铵盐)
H3C6H5O7+NH3=NH4H2C6H5O7 (monoammonium citrate)
柠檬酸单铵与铁的氧化物反响生成柠檬酸亚铁铵和柠檬酸铁铵离子等易溶物质而把锈垢溶解: NH4H2C6H507+FeO=NH4FeC6H5O7+H20
Monoammonium citrate reacts with iron oxides to form soluble substances such as ammonium ferrous citrate and ammonium ferric citrate ions and dissolve rust scale: NH4H2C6H507+FeO=NH4FeC6H5O7+H20
柠檬酸亚铁铵
Ammonium ferrous citrate
2NH4H2C6H5O7+Fe203=2FeC6H5O7+3H20+2NH3
2NH4H2C6H5O7+Fe203=2FeC6H5O7+3H20+2NH3
柠檬酸铁
Ferric citrate
柠檬酸是一个三元酸,在水溶液中存在多级可逆电离均衡:
Citric acid is a ternary acid. There is a multistage reversible ionization equilibrium in aqueous solution.
由此可知在溶液中柠檬酸根(C6H5O7)3-的浓度受溶液pH值的影响很大,pH值越大,溶液中柠檬酸根离子浓度也越大。
It can be concluded that the concentration of citrate radical (C6H5O7) 3 - in solution is greatly affected by the solution pH value. The higher the pH value, the higher the concentration of citrate ion in solution.
而柠檬酸根离子对各种金属离子的络合才能是不同的,络合才能越高所需柠檬酸根离子浓度越小,生成的络离子也越稳定。
However, the complexation ability of citrate ion to various metal ions is different. The higher the complexation ability is, the lower the concentration of citrate ion is required, and the more stable the complexation ion is.
柠檬酸根离子对铁离子的络合才能比对铜离子络合才能强,因而当溶液中含有少量柠檬酸根离子时,即可发作把铁离子荫蔽起来的络协作用,而只要在pH值较高的碱性介质中,电离产生的柠檬酸根离子较多时才干与铜离子很好络合。因而当设备中同时存在铁锈和铜锈瞒能够经过控制pH(加氨水)、使之等于3.5,使容易被络合的铁离子构成柠檬酸亚铁铵和柠檬酸铁而被去除,也避免溶度积很小的Fe(OH)3沉淀产生,在铁化合物被溶解去除之后再溺pH=9进步溶液中的柠檬酸根离子浓度以络合铜离子而去除铜锈污垢。
The complexation ability of citrate ion to iron ion is stronger than that of copper ion. Therefore, when a small amount of citrate ion is contained in the solution, the complexation effect of shading iron ion can occur. In alkaline medium with higher pH value, the complexation ability of citrate ion with copper ion is better only when more citrate ion is produced by ionization. Therefore, when rust and copper rust exist simultaneously in the equipment, they can be removed by controlling pH (adding ammonia water) to make it equal to 3.5, so that iron ions which are easy to be complexed form ammonium ferrous citrate and iron citrate, and avoid the precipitation of Fe(OH)3 with small solubility product. After the iron compounds are dissolved and removed, the concentration of citrate ion in the solution is drowned at pH=9 to improve the concentration of citrate ion and remove it by complexing copper ions. Copper rust dirt.
柠檬酸在化学清洗中常被用于去除铁锈方主的锈垢清洗,为龃快清洗速度,缩短酸铣瓣间,常坚持较高温度,另外,为避免酸对金属的腐蚀还参加缓蚀剂。如在90℃,pH=3.5的3%柠檬酸铵溶液中参加0.1%的Lan-826缓蚀剂,碳钢和合金钢的腐蚀率都降到lmm/a以下。
In chemical cleaning, citric acid is often used to remove rust scale from rust cubes. In order to speed up the cleaning and shorten the acid milling time, it often adheres to a higher temperature. In addition, in order to avoid acid corrosion to metals, it also participates in corrosion inhibitors. For example, when 0.1% Lan-826 corrosion inhibitor is added to 3% ammonium citrate solution with pH=3.5 at 90 ~C, the corrosion rate of carbon steel and alloy steel decreases to less than lmm/a.
氨基磺酸
通常锅炉用盐酸清洗后,常用较稀的柠檬酸来漂洗以去除留下的铁盐,能够使清洗后胚金属外表更容易停止钝化处置。
Usually after the boiler is cleaned with hydrochloric acid, the dilute citric acid is often used to rinse to remove the iron salt left behind, which can make it easier to stop passivation disposal of the metal surface of the embryo after cleaning.
由于柠檬酸单铵有一定酸性能够与碳酸钙水垢反响促;使其溶解,所以也司:以去除金属面的水垢:
Because ammonium citrate has certain acidity, it can react with calcium carbonate scale and dissolve it, so it is also used to remove scale on metal surface.
由于柠檬酸清洗本钱较高,工业上通常只用于舆氏体钢资料或单纯是铁氧化物的锈垢刚设备清洗上。
Because of the high cost of citric acid cleaning, it is usually only used in industry to clean the materials of public austenite steel or rust-scale rigid equipment which is pure iron oxide.
乙二胺四乙酸(EDTA):乙二胺四乙酸又称乙底酸,康泼来宗Ⅱ或软水剂B。
Ethylenediaminetetraacetic acid (EDTA): Ethylenediaminetetraacetic acid, also known as ethidic acid, Complaczon II or softener B.
乙二胺四乙酸的构造式为:
The structure of EDTA is as follows:
其分子中有六个可与金属离子构成配位键的原子(两个氨基氮原子和四个羧基氧原子),它能与许多金属离子构成稳定而易溶于水的螯合物,因而可用于金属化合物垢类的清洗。EDTA是—个四元酸,常用H4Y表示其分子式。
There are six atoms (two amino nitrogen atoms and four carboxyl oxygen atoms) in the molecule which can form coordination bonds with metal ions. They can form stable and soluble chelates with many metal ions, so they can be used for cleaning scale of metal compounds. EDTA is a quaternary acid and its molecular formula is commonly expressed by H4Y.
它在水中分步电离构成H4Y、H3Y-、H2Y2-和Y4-多种离子间的均衡。
It ionizes step by step in water to form the equilibrium among H4Y, H3Y-, H2Y2-and Y4-ions.
EDTA在溶液中以上述五种方式存在,在一定酸度下各种方式按一定数量比例分配。如在酝 pH<2时主要以H4Y方式存在,而在pH>12时主要以y4-方式存在。
EDTA exists in the solution in the above five ways and is distributed in a certain amount proportion under a certain acidity. For example, when incubating at pH < 2, it mainly exists in the form of H4Y, while when pH > 12, it mainly exists in the form of y4-.
EDTA溶解去除金属锈垢主要不是靠H+离子的溶解作用,而是靠Y4—离子的螯协作用。隘 EDTA离子与一至四价金属离子都是按1:1的比例停止络合在EDTA分子中两个能构成配位键的原子(N和O)之距离着两个不E构成配位键的碳原子,因而它们与金属离子络合时构成一个五元环,具有环状构造的络合物6称为螯合物。构成的环状构造越多,螯合物越稳定。从上述构造式能够看出当EDTA与金属卡离子络合时共生成五个五元环。多个环状构造的螯合物被称为稠环螯合物。它在水中难以解6离有较高的稳定性。
EDTA dissolution and removal of metal rust scale mainly depends not on the dissolution of H + ions, but on the chelation of Y4 - ions. Both narrow EDTA ions and tetravalent metal ions stop complexing in a ratio of 1:1. The distance between two atoms (N and O) that can form coordination bonds in EDTA molecule is two carbon atoms that do not form coordination bonds in E. Therefore, when they are complexed with metal ions, they form a five-membered ring. Complex 6 with ring structure is called chelate. The more ring structures are formed, the more stable the chelate is. From the above constructions, it can be seen that when EDTA complexes with metal carbide ions, five five five-membered rings are formed. Chelates with multiple ring structures are called fused-ring chelates. It is difficult to dissociate 6 in water and has high stability.
乙二胺四乙酸在室温下水中溶解度是很小的,100g水仅能溶0.02gEDTA,为了加大其[溶解度,清洗温度需进步至100℃以上,所以通常运用在水:中溶解度较大的乙二胺四乙酸二钠盐NazHzY:把乙二胺四乙酸的钠盐也简称为EDTA;(留意不要混杂)iEDTA对不同金属离子螯合才能是不同的,对Fe3+离
Ethylenediaminetetraacetic acid solubility in water at room temperature is very small, 100 g water can only dissolve 0.02 g EDTA, in order to increase its [solubility, cleaning temperature needs to be improved to more than 100 degrees C, so it is usually used in water: medium solubility of Ethylenediaminetetraacetic acid disodium salt NazHz Y: Ethylenediaminetetraacetic acid sodium salt is also referred to as EDTA; (Note do not mix) iEDTA can chelate different metal ions. It's different for Fe3 + ionization.
柠檬酸根离子对铁离子的络合才能比对铜离子络合才能强,因而当溶液中含有少量柠檬酸根离子时,即可发作把铁离子荫蔽起来的络协作用,而只要在pH值较高的碱性介质中,电离产生的柠檬酸根离子较多时才干与铜离子很好络合。因而当设备中同时存在铁锈和铜锈瞒能够
The complexation ability of citrate ion to iron ion is stronger than that of copper ion. Therefore, when a small amount of citrate ion is contained in the solution, the complexation effect of shading iron ion can occur. In alkaline medium with higher pH value, the complexation ability of citrate ion with copper ion is better only when more citrate ion is produced by ionization. Therefore, when both rust and copper rust exist in the equipment, it can be concealed.