What are the general complexing agents and what are complexing agents

1. Phosphate complexing agent.

Phosphates such as sodium tripolyphosphate, sodium pyrophosphate, sodium hexametaphosphate, etc., are mostly used in the detergent industry and also in the printing and dyeing industry. Its complexing ability is weak, and it is greatly affected by the pH value, and it has a tendency to combine with metal ions such as calcium and magnesium to form scale, and it will cause eutrophication of waters, promote the reproduction of algae, and reduce the oxygen content in the water and cause the deterioration of water quality. The state attaches more and more importance to environmental protection, and the use of phosphate as a complexing agent is not advisable in terms of performance and situation.

2. Alcohol amine complexing agent.

Such as monoethanolamine, diethanolamine, triethanolamine, etc. It has a certain complexing effect, but the complexing ability is poor, and it is more stable in alkalinity, and it is often used as a complexing adjuvant. Triethanolamine is found in Miro KAL-54H chelating agent in Italy.

3. Amino carboxylate complexing agent.

Such as sodium aminotriacetate (NTA), ethylenediaminetetraacetate (disodium EDTA or tetrasodium EDTA), diethylenetriamine pentacarboxylate (DTPA), etc. Amino carboxylate has strong complexing ability, but poor dispersion ability, high stability constant, good alkali resistance, but not concentrated alkali resistance.

4. Hydroxycarboxylate complexing agent.

Such as tartaric acid, heptanoate, sodium gluconate, sodium alginate, etc., have strong complexing ability and poor dispersion ability, but they are easy to biodegrade.

5. Organophosphate complexing agent.

Such as ethylenediaminetetramethylpionate sodium (EDTMPS), diethylenetriamine pentamethylphosphonate (DETPMPS), amine trimethylpionate phosphate, etc. The chelation force of this kind of product is stronger than EDTA, phosphate, etc., with high complexation capacity, large complexation stability constant, metal ions are not easy to dissociate after complexation, and have good chemical stability and easy biodegradation.

6. Polyacrylic acid complexing agent.

The chelating ability is much worse than hydroxycarboxylate, aminocarboxylate and organophosphate, and the varieties used are hydrolyzed polymaleic anhydride (HPMA), polyacrylic acid (PAA), polyhydroxyacrylic acid, maleic acrylic acid copolymer and polyacrylamide. This kind of product has a small complexing capacity and a small stability constant, but it has good scale inhibition performance, and has the function of adsorbing impurities, and has good colloidal properties and dispersion.

1,10-o-diazaphenanthrene, EDTA, dimercaprol propanol, sodium dimercaptopropane sulfonate, mercaptolethylamine, thioglycolic acid, thiourea, ammonia fluoride, 8-hydroxyquinoline, potassium chromate, sodium sulfide, copper reagent, cyanide, acetylacetone, citric acid, tartaric acid, oxalic acid, sulfosalicylic acid, triethanolamine, egta, ethylenediaminetetrapropionic acid, triethyltetradiamine.

There are many more, and I can't find them all at once.

3,4,5-Trihydroxybenzoate cetyl 2-[(methyldithio)methyl]furan n-ethyl-n-[4-[[4-[ethyl[(3-sulfophenyl)methyl]amino[phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadiene-1-subunit]-3-sulfobenzammonium inner salt aluminum salt n-propyl propionate spiro[isobenzofuran-1(3h),9'-[9h]-3-one,3',6'-Dihydroxy-2',4',5',7'-Tetraiodo-, aluminum salt (3:2) 3-Nitrobenzene sulfonate sodium salt Formaldehyde oxime 3-Nitrobenzephthalic acid Vitamin A, alcohol-soluble Cadmium rod 8mm Cis aconitic acid 2,6-Dibromoquinone-4-chloroimide Dipotassium fluorescein Ciprosa amount Steam generator Sodium perperiodate Systemic phosphorus Ethylcellulose M70 Alkaline phosphatase Phosphorus thiol scopolamine hydrobromide Toluene-4-sulfonyl chloride Toxaphene cyclohexanone peroxide.

Chromic Acid, Pyrogallol Red, Alizarin Complexing Indicator, Diphenylcarbohydrazide, Dibenzoazocarbohydrazide, Phenolphthalein Complexing Agent, Aluminum Reagent, Zinc Reagent, Ammonium Asterurate, Bromopyrallol Red, Acid Blue, Chromium Azure, Chromium Blue Black, Curcumin, Methylene Blue, Algae Red B

Complexing agents, especially organic complexing agents with multifunctional groups, are more and more widely used in the printing and dyeing industry, such as softening water quality, preventing sediment, eliminating scaling of dyeing and finishing equipment, preventing fabric bleaching holes, and ensuring dyeing brightness. Complexing agents are also known as chelating agents, chelating dispersants, metal blocking agents, water softeners and so on in the printing and dyeing industry.

Complexing agent, also known as chelating agent, is a compound that forms complexing ions with metal ions. In the electroplating solution, except for a few electroplating solutions, such as acid solution iron plating, nickel plating, chrome plating, copper plating, no or no complexing agent is used, most other electroplating solutions, such as alkaline solution silver plating, gold plating, copper plating, galvanizing, tinning, copper-tin alloy, etc., need to use complexing agents. Such as cyanide, hydroxide, citrate, pyrophosphate, thiosulfate, sulfite, etc., are widely used as complexing agents in electroplating production.

Introduction to complexing agents and their applications in the printing and dyeing industry.

Complexing agents are also known as chelating agents, chelating dispersants, metal blocking agents, water softeners and so on in the printing and dyeing industry. Complexing agents, especially organic complexing agents with multifunctional groups, are more and more widely used in the printing and dyeing industry, such as softening water quality, preventing sediment, eliminating scaling of dyeing and finishing equipment, preventing fabric bleaching holes, and ensuring dyeing brightness. Compounds formed by complexing agents that combine with metal ions and have only coordination bonds but no covalent bonds are called complexes, and compounds that have both coordination bonds and covalent bonds are called chelates.

The complexation stability constant of the complex is the constant that balances the reversible reaction of complexation and dissociation. The lower the stability constant, the more metal ions dissociated by the complex, and the higher the stability constant, the fewer metal ions dissociated by the complex, or even no dissociation, and the complex does not become valent in the redox reaction. Complexation capacity (complexing capacity) refers to the amount of metal ions that can be complexed per gram of complexing agent, and the higher the complexing capacity, the stronger its complexing capacity.

The stability of complexing agents at different pH values, i.e., the change of stability constants at different pH values, is another important performance of complexing agents. The complexing ability of some complexing agents varies greatly at different pH values, and some even hydrolysis, decomposition or reaction will occur and lose the complexing force. For example, EDTA is suitable for acidic and neutral media but not alkaline medium, and sodium hexametaphosphate has a good complex force in acidic medium.

It can be seen that different complexing agents have different properties and complexing capabilities, so they should be selective when used.

The above is for your reference! Hope it helps!

Hangzhou Library.

The application range and industry of complexing agent are very broad, and the main role is to combine with metal ions (generally including calcium, magnesium, iron, copper, etc.) in solvents (usually water) through the complexing function of the agent itself to form complexes.

Thus reducing the *** of metal ions to solvents.

There are mainly the following categories of metal complexing agents:

1. Inorganic salts.

Complexing agent: sodium hexametaphosphate.

Sodium tripolyphosphate, sodium metasilicate.

2. Organophosphate complexing agent: HEDP, ATMP, EDTMPS, DTPMPA, etc.

3. EDTA and DTPA series products.

Fourth, green phosphorus-free new complexing agent.

With the improvement of environmental protection requirements, phosphorus-free will become the inevitable road of the cleaning agent industry, the emission index requirements for cleaning waste liquid are getting better and better, conventional cleaning agents because of the subsequent emission of phosphorus or ammonia nitrogen, COD emissions and other problems, at present, especially in the future will face restrictions, in the face of such situations, our company developed a green phosphorus-free environmentally friendly chelating dispersant, to solve the problem of phosphorus-containing chelating agent used in conventional cleaning agents, the molecule can dissociate H+ in water, become a negatively charged anion on the surface.

It is complexed with metal ions such as Ca2+, Mg2+, Fe2+, and Cu2+ in solution to form a stable complex.

The molecules of green phosphorus-free 133709 environmentally friendly chelated 90396 dispersant have strong adsorption after ionization into anions in water, and have strong adsorption capacity, so that the surface of the particles has the same charge, so that the particles repel each other electrostatically, avoid the accumulation caused by the collision of particles, and suspend the particles in the water in a dispersed state.

It is widely used in washing daily chemicals, metal surface cleaning, photovoltaic cleaning, optical glass cleaning, PCB circuit boards.

Cleaning, auto parts cleaning, plastic cleaning and other cleaning industries will become the mainstream chelating agent at home and abroad in the future.

Product features: 1. Green and phosphorus-free, which can replace conventional phosphine-containing chelating agents.

2. Strong chelation ability, which can replace conventional EDTA series products.

3. Strong dispersion force to prevent deposition.

4. Prevent corrosion and scaling of cleaning equipment and pipelines.

Complexes are made up of a mixture of two or more substances, but they still retain their original properties and structure.

Coordination bonds are made by the ligand that donates the lone electron pair with the central atom that accepts the lone electron pair.

The compounds formed by the binding become coordination compounds.

Abbreviated as complexes.

Complexes are its old names), such as [Cu(NH3)4]SO4, Na3[Alf6], etc., the inner brackets are called the inner boundary of the complex, and the outer one is called the outer boundary. The complete ionization of the complex in water is caused by the breaking of the ionic bond between the inner and outer boundaries, for example: [Cu(NH3)4]SO4=[Cu(NH3)4](2+).

so4(2-)

A molecule or ion with different properties from the original component formed by a certain number of ligands (anions or molecules) binding around the central ion (or neutral atom) through a coordination bond is called a complex.

Coordination compounds are referred to as complexes (complexes). [Cu(NH3)4]SO4, [PT(NH3)2C12], K4[Fe(CN)6], etc. are complexes.

Complex nomenclature principles:

1. Anions in the front and cations in the back.

2. For neutral or cationic complexes, the ligand is first named, and the word suffix is "he" and the metal name; The name of the metal is followed by a Roman numeral in parentheses to indicate the oxidation number of the metal.

3. When there are different ligands in the same complex, the anion is in front and the neutral molecule is in the back.

4. When there is more than one ligand of the same kind, the prefix.

Second, third-class prefixes. For example, K4[Fe(CN)6]potassium hexacyanide ( )potassium [Cu(NH3)4]SO4 copper tetraamino( )PT(NH3)2Cl2] dichloro·diaminoplatin( ).

Complexes, also known as coordination compounds. Any structural unit formed by two or more molecules or ions containing lone pairs (or bonds) as ligands and central atoms or ions with empty valence electron orbitals is called a complex unit, and a complex unit with an electric charge is called a complex ion. Electrically neutral complexing units or compounds consisting of complex ions and oppositely charged ions are called complexes.

Coordination compounds are referred to as complexes, also known as miscomplexes and complexes, which are a class of compounds with characteristic chemical structures, which are formed by the combination of central atoms or ions (collectively referred to as central atoms) and molecules or ions called ligands (referred to as ligands) around it, completely or partially formed by coordination bonds.

Coordination compound (coordinationcompound) referred to as complex, also known as miscombination, complex, is a class of compounds with characteristic chemical structure, composed of the central atom or ion (collectively referred to as the central atom) and the molecule or ion around it called the ligand (referred to as ligand), completely or partially formed by the coordination bond.

Basic composition. The complex is composed of a central atom, a ligand, and an external body, such as copper tetraamino( ) sulfate with the formula Cu(NH3)4 SO4 coordination compound.

The central atom can be a charged ion, as in Cu(NH3)4 The cu ligand in SO4 gives lone pairs or multiple amorphous electrons, and the central atom accepts lone pairs or multiple amorphous electrons to form a coordination bond that binds the two. For example, K4 [Fe(CN)6], [Cu(NH3)4] SO4, [PT(NH3)2Cl2] and [Ni(CO)4] are complexes. Where:

cn:-, NH3, and Co are ligands, and all have lone pairs of electrons ( )Fe2+, Cu2+, Pt2+, and Ni are the central atoms, and all of them can accept lone pairs. The ligand and central atom form the coordination body, which is included in square brackets.

The complexes undergo partial dissociation in solution, but still tend to retain their bodies. All metals in the periodic table can be central atoms, with transition metals (see transition elements) forming complexes more easily. Nonmetals can also act as central atoms.

There are two types of ligands: single-tooth ligands and multi-tooth ligands. There is only one coordination atom in a single tooth, e.g. Cn-, Co, NH3 and Cl- are all single-tooth ligands, and the coordination atoms are C, N and Cl respectively, which are directly bonded to the central atom. Polydentate has two or two to coordinate compounds.

Upcoordination atoms: ethylenediamine H2NCH2CH2NH2 is a double-toothed ligand, and the coordination atom is two N atoms; Ethylenediaminetetraacetic acid (EDTA4-) (OOCCH2)2N-CH2-CH2-N (CH2Coo-)2 is a six-toothed ligand with coordination atoms being O on two N and four carboxyl groups. The ligands are negative or neutral molecules, and occasionally positive ions (e.g., NH2NH).

The charged coordination body is called the ligand, the positively charged ligand is called the cation, and the negatively charged is called the anion. The charge of the ligand is the sum of the charges carried by the metal ion and the ligand, for example, Fe2+ and 6CN- coordination produces [Fe(CN)6]4-matching anion, and Cu2+ and 4NH3 produce [Cu(NH3)4]2+ matching cation, each of which forms a complex with oppositely charged cations or anions. Neutral coordination bodies are complexes, such as Pt2+, 2NH3 and 2Cl- to produce [PT(NH3)2Cl2]. Ni and 4Co produce Ni(Co)4.

The complexes can be single or multi-nucleated, with a single nucleus having only one central atom; Multinucleus has two or more central atoms. The above complexes are all single-nucleated complexes; Multinuclear complexes such as [(co)3fe(co)3fe(co)3].