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Introduction to alkalinity of polyaluminum chloride

We all know that polyaluminum chloride is a water purifying agent, which can purify sewage, although it is not detailed. But what is the alkalinity of polyaluminum chloride? Few people know about it. Today, the manufacturer of polyaluminum chloride leads us to understand the alkalinity of polyaluminum chloride through chemical formula?

Polyaluminum chloride (PAC) is the general name of a series of inorganic polymers, usually expressed in the general formula Aln (OH) mCl3n-m, in which n represents the degree of polymerization, which depends on various factors in the preparation process, and m represents the degree of neutrality of polyaluminum chloride products, that is, the degree to which hydroxide ions replace chlorine ions.

Polyaluminum chloride can be regarded as the intermediate product in the process of gradual hydrolysis of AlCl3 to Al (OH) 3, that is, the products of gradual substitution of Cl by hydroxyOH -. The degree of hydroxylation in a certain form of polyaluminum chloride is the alkalinity, which is the ratio of hydroxy equivalent and aluminum equivalent in polyaluminum chloride.

The degree of polymerization of polyaluminum chloride is affected by many factors, among which the content of hydroxyl radical is more direct and has a greater impact. Therefore, people usually take the ratio of Al to Cl or alkalinity (also known as salinity) as its characteristic parameter to describe the degree of polymerization, which is more commonly used later.

The alkalinity of PAC is defined by the following formula:

Alkalinity B (%)=[OH -]/3 [Al3+] × 100 Wherein, [OH -] and [Al3+] represent the molar concentrations of hydroxide and aluminum ions respectively. According to the chemical conversion rules, the alkalinity can also be expressed as:

Alkalinity B (%)=m/3n × one hundred

The practice shows that the alkalinity is one of the important indicators of polyaluminum chloride. The alkalinity is closely related to the degree of polymerization of polyaluminum chloride, the amount of electric charge, the coagulation effect, the pH value of the finished product, the dilution ratio in use and the stability in storage. The alkalization degree of commonly used polyaluminum chloride is 50%~80%.

Thank you for your attentionHenan aierfuke Chemical Co., Ltd：Focus on water treatment, only for the healthy world! Our company is committed toPolyaluminium chloride、Polyferric sulfateThe R & D, manufacturing and sales of series of water purification materials are willing to create success with our customers and friends.