Tang Lian Chemistry


Classification of reactor

1. Steel (or porcelain-lined) reactor

The most common steel reactor material is Q235 steel (or container steel). The design and manufacture of steel reactor are the same as ordinary pressure vessels. The operating pressure and temperature selected in the design are the highest pressure and highest temperature in the reaction process. The shell equipped with a jacket is calculated according to the external pressure vessel, and the jacket itself is calculated according to the internal pressure vessel. Accessory parts such as manholes, hand holes, process nozzles, etc. are usually set on the lid of the vessel. The diameter of the shell, head and The wall thickness can be selected according to the standard.

For equipment that requires anti-corrosion measures, the acid-resistant porcelain plate can be firmly bonded to the inner surface of the kettle with a prepared acid-resistant cement, and it can be used after curing. The reaction kettle lined with porcelain can withstand any concentration of nitric acid, sulfuric acid, hydrochloric acid, and low-concentration lye and other media, which is an effective method for anti-corrosion in chemical production at present.

The steel reactor is characterized by simple manufacturing process, low cost, maintenance and inspection

It is easy to repair and has a wide range of use. Therefore, it is widely used in chemical production.

2. Cast iron reactor

The cast iron reactor has certain corrosion resistance to alkaline materials. When the wall temperature is lower than 25℃ and the internal pressure is lower than 0.6MPa, the maximum diameter can reach 1000mm; when the cast iron grade is increased, the maximum diameter can reach 3000mm.

Cast iron equipment is used in the reaction process of sulfonation, nitrification, condensation, sulfuric acid concentration, etc.

3. Glass-lined reactor

The glass-lined reactor is made of glass containing high silica, which is firmly bonded to the inner surface of the metal equipment after high temperature firing. It has the advantages of glass stability and high strength of the metal itself, corrosion resistance, smoothness, wear resistance and certain stability. It has been widely used in chemical, pesticide, pharmaceutical, dye, food and metallurgical industries. The performance of the glass-lined reactor is as follows.

①Corrosion resistance It is resistant to various concentrations of inorganic acids, organic acids, organic solvents and weak alkalis, but it is not resistant to hydrofluoric acid and fluoride ion-containing media, concentrated phosphoric acid and strong alkalis with a temperature greater than 180°C.

②The heat resistance is allowed to be used within the range of 30 to 240°C, the heat-resistant temperature difference is less than 120°C, and the cold-resistant temperature difference is less than 110°C.

③Impact resistance The impact resistance is poor, so avoid the impact of hard objects when using it. Glass-lined equipment should not be used for storage and reaction of the following media, otherwise it will be quickly damaged due to corrosion:

①Hydrofluoric acid of any concentration and temperature;

② Alkaline medium with pH value> 12 and temperature greater than 100°C;

③ Phosphoric acid with a temperature greater than 180°C and a concentration greater than 30%;

④The reaction process of alternating acid and alkali;

⑤Other media containing fluoride ions.

The glass-lined reactor should be protected from collision during transportation and installation. Strictly prevent heavy objects from falling into the container when feeding, and slowly pressurize and heat up during use to prevent drastic changes.


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