Recycling second-hand reaction vessels with stainless steel enamel material mechanical seals

The broad understanding of a reaction kettle is a stainless steel container with physical or chemical reactions. The structural design and parameter configuration of the container are carried out according to different process conditions. The design conditions, process, inspection, manufacturing, and acceptance need to be based on relevant technical standards to achieve the heating, evaporation, cooling, and low-speed mixing reaction functions required by the process. Pressure vessels must comply with the GB150 {Steel Pressure Vessels} standard, and atmospheric pressure vessels must comply with the NB/T47003.1-2009 {Steel Welded Atmospheric Pressure Vessels} standard. The pressure requirements during the reaction process also vary in terms of the design requirements for the container. Production must strictly follow the corresponding standards for processing, testing, and trial operation. Stainless steel reaction vessels vary according to different production processes, operating conditions, etc. The design structure and parameters of reaction vessels are different, that is, the structural style of reaction vessels is different, and they belong to non-standard container equipment.

A reaction vessel is a comprehensive reaction vessel, and the design of the structure, function, and configuration accessories of the reaction vessel is based on the reaction conditions. From the beginning of the feeding reaction discharging process, the pre-set reaction steps can be completed with a high degree of automation, and important parameters such as temperature, pressure, mechanical control (stirring, blowing, etc.), and reactant/product concentration during the reaction process can be strictly regulated. Its structure generally consists of a kettle body, transmission device, stirring device, heating device, cooling device, and sealing device. Corresponding auxiliary equipment: fractionation column, condenser, water separator, collection tank, filter, etc.

The materials of reaction vessels generally include carbon manganese steel, stainless steel, zirconium, nickel based (Hastelloy, Monel) alloys, and other composite materials. The reaction vessel can be made of stainless steel materials such as SUS304 and SUS316L. Blenders come in anchor, frame, paddle, turbine, scraper, and combination types. The rotating mechanism can use cycloidal pinwheel reducers, continuously variable speed reducers, or variable frequency speed reducers to meet the special reaction requirements of various materials. The sealing device can adopt sealing structures such as mechanical seals and packing seals. Heating and cooling can be achieved through structures such as jackets, half tubes, coils, and Miller plates. Heating methods include steam, electric heating, and thermal oil to meet the process requirements of different working environments such as acid resistance, high temperature resistance, wear resistance, and corrosion resistance. And it can be designed and manufactured according to the user's process requirements.

1. According to the heating/cooling methods, it can be divided into electric heating, hot water heating, thermal oil circulation heating, far-infrared heating, external (internal) coil heating, jacket cooling, and kettle coil cooling. The choice of heating method is mainly related to the heating/cooling temperature required for the chemical reaction, as well as the amount of heat required.

2. According to the material of the kettle body, it can be divided into carbon steel reaction kettle, stainless steel reaction kettle, enamel reaction kettle (enamel reaction kettle), and steel lined reaction kettle.

Scope of application: Environments that do not contain corrosive liquids, such as certain oil processing.

1. Heating structure type

Electric heating type, jacket type, outer half tube type, inner disc tube type, with a volume of 0.01m3 to 45m3

2. Material

Carbon steel, stainless steel, high temperature resistant stainless steel, strong acid and alkali resistant stainless steel, enamel or PP materials, etc.

3. Mixing type

Slant type, anchor type, frame type, propulsion type, and single (double) spiral type, and other types of blades can be designed and manufactured according to customer requirements.

Scope of application: Suitable for high-temperature and high-pressure chemical reaction tests in departments such as petroleum, chemical, pharmaceutical, metallurgical, scientific research, and colleges and universities. It is used to complete processes such as hydrolysis, neutralization, crystallization, distillation, evaporation, storage, hydrogenation, alkylation, polymerization, condensation, heating mixing, and constant temperature reactions. It can achieve high stirring effect on viscous and granular substances.

Scope of application: Widely used in industries such as petroleum, chemical, food, medicine, pesticides, and scientific research.

Applicable scope: Suitable for acids, bases, salts, and most alcohols. Suitable for the extraction of liquid food and pharmaceuticals. It is an ideal replacement for lined rubber, fiberglass, stainless steel, titanium steel, enamel, and plastic welded plates.

Scope of application: Excellent anti-corrosion performance, able to resist various concentrations of acids, alkalis, salts, strong oxidants, organic compounds, and all other highly corrosive chemical media.

3. According to the working pressure, it can be divided into atmospheric pressure reaction kettle, positive pressure reaction kettle, and negative pressure reaction kettle.

4. According to the mixing form, it can be divided into blade type, anchor blade type, frame type, screw belt type, turbine type, dispersed disc type, combination type, etc.

5. According to the heat transfer structure, it can be divided into jacket type, outer half tube type, inner coil tube type, and combination type.

The reaction kettle consists of a kettle body, kettle cover, jacket, stirrer, transmission device, shaft seal device, support, etc. When the aspect ratio of the mixing device is large, multiple layers of mixing blades can be used, and it can also be selected according to the user's requirements. A jacket is installed outside the kettle wall, or a heat exchange surface is installed inside the reactor, or heat exchange can be achieved through external circulation. The support seat can be of the support type or ear type. Gear reducers should be used when the speed exceeds 160 revolutions per minute. The number of openings, specifications, or other requirements can be designed and manufactured according to user requirements.

1. Packing sealing is usually used under normal or low pressure conditions, with a pressure of less than 2 kilograms.

2. In general, mechanical seals are used for medium pressure or vacuum situations, with a pressure of negative pressure or 4 kilograms.

3. Magnetic sealing will be used under high pressure or high volatility of the medium, usually when the pressure exceeds 14 kilograms. Except for magnetic seals that use water cooling, other sealing forms will increase the cooling water jacket when the temperature exceeds 120 degrees.

A reactor is a type of reaction equipment that must be operated carefully, otherwise it may be damaged due to various reasons, leading to production being forced to stop. There are many aspects to pay attention to when operating a reactor.

Firstly, it is necessary to strictly operate the reactor according to the rules and regulations.

Secondly, before operation, carefully check for any abnormalities. During normal operation, do not open the upper cover or touch the wiring terminals on the board to avoid electric shock; It is strictly prohibited to operate under pressure; During the nitrogen pressure test, carefully observe the changes in the pressure gauge. Once the test pressure is reached, immediately close the nitrogen valve switch; The heating rate should not be too fast, and the pressurization should also be carried out slowly, especially the stirring speed, which is only allowed to increase slowly.

Finally, when the kettle body is heated to a higher temperature, do not come into contact with the kettle body to avoid burns; After the experiment, the temperature should be lowered first. Do not cool quickly to prevent damage caused by excessive temperature and pressure differences. At the same time, it is necessary to unplug the power supply in a timely manner.