Introduction to the Types and Functions of Valves Equipped on Laboratory Reactors

Laboratory reactor manufacturers equip their production processes with a variety of valves, each of which has its own unique characteristics and application areas. First, the gate valve: This is a commonly used shut-off valve designed to connect or isolate the medium in a pipeline; however, it is not suitable for regulating the flow rate of the medium. Gate valves are typically employed in laboratory reactors where pressure, temperature, and pipe diameter can vary significantly. Second, the globe valve: Also a type of shut-off valve, similar to the gate valve—but unlike the gate valve, the globe valve is more appropriate for applications involving smaller pipe diameters. Third, the throttling valve controls fluid pressure and flow rate by altering the cross-sectional area of the flow passage. It is a type of control valve; however, due to its design...

The Role of Baffles Installed Inside Magnetic Stirred Reactors and Determination of Relevant Data

Sometimes, baffles are added to the inner wall of a magnetic stirrer reactor. The functions of these baffles are as follows: First, when the viscosity of the material is relatively low, the high-speed rotation of the impeller generates a tangential flow under the influence of centrifugal force, which causes the liquid to be flung toward the reactor walls and rise along the perimeter of the vessel, while the liquid level in the center naturally drops, thereby forming a large depression inside the magnetic stirrer reactor—this phenomenon is referred to as "whirlpool formation." The material caught in the whirlpool rotates closely along with the stirring shaft and fails to achieve adequate mixing. If the mixture contains multiple phases, phase separation or layering may occur. Second, when the viscosity of the material is relatively high, a large amount of air is drawn into the surface of the liquid layer, reducing the liquid's surface tension.

Design Method for Industrial Reactors

Before manufacturing, industrial reactors must have their volume, vessel dimensions, and cylinder wall thickness confirmed based on the requirements of the production process. Below, the designers from Weihai Self-Control Reactor Co., Ltd. will guide you through simple conversions related to these issues. I. Volume: The material balance should be calculated based on the reaction time and target production volume. (1) Calculate the processing capacity of raw materials or the output of products per unit time. Using this processing capacity or output along with the rate equation, determine the reaction time. Based on the reaction time, calculate the effective volume of the reactor. The total volume of the equipment is equal to the effective volume divided by a factor of 0.6 to 0.8. II. Nominal Pressure for the Reaction: When the reaction…

Maintenance and Care of Laboratory Reactors

To reduce the occurrence of malfunctions in laboratory reactors, regular maintenance and upkeep are essential: 1. The laboratory reactor should be placed in a well-ventilated and dry area. In particular, the control system must be kept away from humid or corrosive environments to avoid shortening the equipment’s service life. 2. During transportation, anti-vibration measures should be taken to prevent severe vibrations from loosening connections, causing the reactor lid to become loosely attached to the reactor body, or damaging the sealing surfaces. 3. Keep the working environment clean to prevent dust and contaminants from causing poor electrical contact in the equipment’s wiring and other components. 4. Ensure that wire connections remain in good condition. If used for an extended period, check for insulation degradation or loose connections in aviation connectors.

Use and Maintenance of Laboratory Reactors (Part 1)

After long-term exploration by our manufacturer, we’ve found that if users properly operate and promptly maintain laboratory reactors, they can effectively extend the equipment’s service life. Next, let me walk you through the operating procedures for the control unit. The circuit principles of the control sections in various models of laboratory reactors differ significantly, so their operating procedures should be followed precisely according to the instructions provided in the equipment manuals. The standard operating procedure is as follows: 1. Preparations for power supply: (1) Connect the control unit using power cords and cables, then connect the reactor vessel and its lid, and securely tighten the safety devices to ensure good electrical contact and display functionality. (2) Check the electricity being used...

Application Characteristics of Reactors in the Production of Food Products Such as Flavors and Fragrances

Flavorings and fragrances are two types of additives commonly used in food products; however, these two products are not the same. A fragrance is a single, pure substance, whereas a flavoring is a blend created by artificially combining various individual fragrances. Fragrances can be produced through methods such as pressing, extraction, adsorption, and steam distillation, while flavorings are primarily manufactured by carefully blending different fragrance compounds and other ingredients according to specific formulations. Therefore, during the production of flavorings and fragrances, reaction vessels are mainly used for fragrance products. Over the years, our company’s collaboration with fragrance manufacturers has revealed that this type of production equipment has certain unique characteristics and specific requirements: 1. Material of reaction vessels: Since these vessels are used for food additives...

Use and Maintenance of Laboratory Magnetic Stirred Reactors (Part 2)

In the previous article, we discussed the precautions that should be taken when using and maintaining laboratory magnetic stirrer reactors. Now, let’s talk about the key points to keep in mind during the initial use of this equipment in the lab: 1. For users who are new to magnetic stirrer reactors, it’s essential to carefully familiarize yourself with the equipment’s functional specifications before use, including: the maximum operating pressure, the maximum operating temperature, the corrosion resistance of the main material, the types of openings on the reactor lid and whether it comes equipped with a distillation cooling function, the methods for cooling and heating inside the reactor, the type of valve used at the discharge port, as well as the appropriate stirring speed and the viscosity range suitable for the agitator blades. 2. Be sure to carefully read the equipment’s manual and pay attention to frequently asked questions.

Application Areas and Characteristics of Hydrogenation Reactors

A hydrogenation reactor is a stirred-tank reactor used for gas-liquid reactions. Under mechanical stirring, hydrogen gas is introduced into the liquid phase in the form of bubbles, where it diffuses, convects, and reacts within the liquid layer. Hydrogenation reactors are primarily applied in four major fields, including the chemical industry: (1) liquid-phase reaction processes; (2) gas scrubbing and purification; (3) production of high-purity products; and (4) biological systems. In all these processes, the core component is the hydrogenation reactor itself, which is specifically designed to facilitate the aforementioned reactions and absorption processes. Commonly used impellers in such reactors typically feature six flat-blade turbines or disc turbines, with an air inlet pipe positioned just below the impeller. This arrangement...

Comparison of the advantages and disadvantages of using TC4 and TA2 in laboratory reactors

TC4 is a titanium alloy, while TA2 is pure titanium. Both materials are widely used in the manufacture of laboratory reactors, primarily because they effectively meet the performance requirements of laboratory reactors, particularly in terms of corrosion resistance. The main differences between these two materials are as follows: 1. In terms of chemical composition: TA2 contains 99% titanium and less than 0.2% carbon, whereas TC4, in addition to titanium and carbon, also includes elements such as manganese, vanadium, aluminum, and tin. 2. In terms of mechanical strength and tensile properties: Due to the presence of certain alloying elements in TC4, its mechanical strength and tensile properties are superior to those of TA2. This characteristic...

Control Methods for Temperature Precision in Laboratory Reactor Operation

Weihai Self-Control Reactor Co., Ltd. specializes in the manufacture of laboratory reactors with a high degree of control. Regarding the temperature control accuracy of reactors used during customer experiments, the following methods can be employed to improve it: 1. For laboratory reactors with smaller vessel volumes and operating at very high temperatures, the temperature control accuracy is primarily achieved through segmented temperature control via intelligent programs on the temperature controller. During operation, the temperature controller performs PID self-tuning, ensuring that the temperature is tentatively heated and controlled around the setpoint temperature of the equipment. This temperature-control method typically achieves an accuracy of about 1 to 1.5 degrees Celsius, making it well-suited for applications where precise temperature control is required but not extremely stringent.

Method for the Air-tightness Test of Lined High-pressure Reactors

To test the air tightness of lined high-pressure reactors, follow these procedures: 1. The test temperature shall be room temperature. 2. During the test, the pressure should be increased slowly. After reaching the specified test pressure, hold the pressure for 30 minutes and perform leak inspections on all welded joints and connection points. For small-sized high-pressure reactors, the leak test can be conducted by immersing the reactor in water. 3. If any leaks are detected, repair the leaking areas and then repeat the air-tightness test. 4. The gaps between the lining layer and the base material shall also undergo an air-tightness test at the equipment’s design pressure. For composite plate high-pressure reactors, the gaps between the cladding weld joints and the base material shall similarly be subjected to an air-tightness test.

Method for Removing Contaminants from Laboratory Magnetic Stirred Reactors (Part 3)

Previously, the editor briefly described several methods for removing long-term contaminants adhering to the inner walls of magnetic stirrer reactors used in laboratories. Now, continuing from the previous discussion, let’s talk about acid pickling, solvent-based removal, and ultrasonic cleaning. First, the acid pickling method—this method is primarily suitable for removing corrosive substances from the inner walls of magnetic stirrer reactors. In the acid pickling process, special attention must be paid to the fact that acid pickling can induce hydrogen embrittlement in materials such as austenitic stainless steel. Therefore, after acid pickling, it’s essential to immediately carry out a dehydrogenation treatment—baking at around 200 degrees Celsius for three hours. Additionally, the duration of acid pickling must be carefully controlled to prevent excessive corrosion of the reactor walls. After acid pickling, a neutralization treatment should be performed.