Сульфат алюминия

Description

High purity aluminum sulfate (Aluminum sulfate, Puratronic hydrate) is an inorganic salt of sulfuric acid and aluminum, CAS number 22337-62-8, formula Al2O12S3. This is a high-purity (“99.999% in terms of metals”) form of aluminum sulfate under the trade name Puratronic, used primarily in analytical chemistry and materials science, in contrast to technical aluminum sulfate (CAS 10043-01-3), which is widely used as a coagulant in water treatment.

Basic Attributes

• CAS No.: 22337-62-8
• Chemical formula: Al2O12S3
• Molecular weight: 342.150876

Scope of application

The source data for this high-purity form of aluminum sulfate lacks melting and boiling points, density, solubility and GHS classification - the source is limited to CAS ID, formula and molecular weight. Judging by the designation “Puratronic” and the declared purity of 99.999% for metals, the substance is intended for precision laboratory tasks: preparation of standard and calibration solutions of aluminum, synthesis of high-purity materials based on aluminum oxide and hydroxide, use as a reagent in analytical chemistry, where impurities of other metals are unacceptable.

In general, aluminum sulfate (in any degree of purity) as a class of compounds is used in industry as a coagulant for the purification of drinking and waste water, in the pulp and paper industry for sizing and holding filler, in textile dyeing and finishing, in the leather industry, and as a laboratory reagent where a source of aluminum ion or regulation of the pH of the solution is required.

Mechanism of action in water treatment

Although this batch is not intended for industrial water treatment, but for analytical purposes, the principle of action of aluminum sulfate as a class of compounds is general: when dissolved in water, the aluminum ion is hydrolyzed to form positively charged hydroxo complexes, which neutralize the negative charge of colloidal turbidity particles and trigger their coagulation - sticking together into large flakes that settle or are removed by filtration. For analytical applications, it is not this function that is of decisive importance, but the high purity of the reagent—the absence of extraneous metal cations that would distort the result of a quantitative analysis or the composition of the synthesized material.

Safety Information

Specific data on hazard classification, transport codes and GHS phrases for this high-purity form are not available in the original dump. In the absence of official labeling, general precautions applicable to metal sulfate salts should be followed: avoid inhalation of dust, contact with skin and eyes, and use gloves and safety glasses when handling the powder.

Storage and transportation

Store in a dry, hermetically sealed form - aluminum sulfate is hygroscopic and is capable of forming hydrates upon contact with air moisture, which changes the stated composition and weight of the sample. Keep the container tightly closed, labeled, indicating the batch and date of packaging, separately from incompatible reagents. Official transport codes, hazard class and GHS phrases for this particular high-purity form are not given in the original source, so transport and handling of the material is organized according to the general rules for inorganic sulfate salts.