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.

General requirements for level gauges installed on high-pressure reactors

High-pressure reactors sometimes need to be equipped with level gauges according to customer requirements. The general requirements for installing level gauges are as follows: 1. The level gauge should be selected based on the medium of the high-pressure reactor, the maximum allowable working pressure (or design pressure), and the design temperature. 2. Before using the level gauge, for equipment with a design pressure less than 10.0 MPa, a hydraulic test shall be conducted at 1.5 times the nominal pressure of the level gauge; for equipment with a design pressure equal to or greater than 10.0 MPa, a hydraulic test shall be conducted at 1.25 times the nominal pressure of the level gauge. 3. For high-pressure reactors storing materials at temperatures below 0 degrees Celsius, frost-resistant level gauges should be selected.

Replacement Standards for Pressure Gauges Used in High-Pressure Reactors

The pressure gauges used on high-pressure reactors must be replaced under the following circumstances: 1. For pressure gauges with limiting pins on high-pressure reactors, if the pointer fails to return to the limiting pin position when there is no pressure, or for pressure gauges without limiting pins, if the distance between the pointer and zero exceeds the allowable error of the gauge when there is no pressure. 2. If the glass cover of the dial is broken or the scale markings on the dial are blurred and unclear. 3. If the seal is damaged or the calibration validity period has expired. 4. If there is leakage from the spring tube inside the pressure gauge used on the high-pressure reactor, or if the gauge’s pointer becomes loose. 5. If the pointer is broken or the casing is severely corroded. 6. Any other defects that affect the accurate indication of the pressure gauge.

Installation and Use of Magnetic Stirred Reactors

Host Installation and Operation (1) Equipment Environment: The magnetic stirrer reactor should be placed in a high-pressure operating room that meets explosion-proof requirements. When installing multiple magnetic stirrer reactors, they should be arranged separately, with reliable explosion-proof walls providing separation between every two reactors. Each operating room must have an exit directly leading to the outside or to a passageway. If explosive media are present, the equipment location must be well-ventilated. (2) Installation and Sealing of the Reactor Lid: The reactor body and the reactor lid adopt a sealing design featuring line contact between conical and arc surfaces. Tighten the main bolts to ensure that the two components are firmly pressed against each other, achieving a reliable seal. When tightening the main bolts, do not exceed the specified torque limit.

Application Characteristics of High-Pressure Reactors for Nickel and Nickel-Based Alloys (Part 1)

High-pressure reactors made of nickel and nickel alloys exhibit superior corrosion resistance to strong acids, strong bases, and other highly corrosive media compared to those made of stainless steel and other non-ferrous metals. They also operate at higher service temperatures, making them one of the most important types of high-pressure reactors currently available. When using high-pressure reactors made of nickel and nickel-based alloys, attention should be paid to the following points regarding their allowable operating temperatures: 1. If the reactor is constructed from a nickel alloy whose primary alloying elements are chromium or molybdenum, and the service conditions of the vessel’s medium could potentially induce intergranular corrosion in these nickel alloys, the maximum allowable operating temperature of the equipment should not exceed the long-term aging temperature that would increase the susceptibility of these nickel alloys to intergranular corrosion.

Key Considerations for Selecting a Pilot-Scale Hydrogenation Autoclave

The pilot-scale hydrogenation autoclave is a product positioned between laboratory hydrogenation autoclaves and industrial hydrogenation autoclaves. Its key distinguishing feature is its larger volume compared to laboratory autoclaves. Moreover, since hydrogenation or hydriding reactions can be highly exothermic, the pilot-scale hydrogenation/hydriding autoclave is equipped with explosion-proof features for both the stirring motor and the electric heating system. Additionally, due to the increased aperture size, laboratory autoclaves typically feature open-top designs, whereas pilot-scale autoclaves are no longer limited to closed designs. Instead, influenced by factors such as pressure, temperature, and volume, they often adopt closed structures. In terms of converting design pressure into working pressure, hydrogenation autoclaves also differ from conventional autoclaves.

Key points for non-destructive testing of the surface of industrial high-pressure reactors

Magnetic particle testing and penetrant testing are both surface nondestructive testing methods. Surface nondestructive testing of welded joints in industrial high-pressure reactors should be conducted according to the following key points: 1. Surface nondestructive testing shall be performed on welded joints of high-pressure reactors whose design temperature is below -40°C. 2. Welded joints on high-pressure reactors made of stainless steel with a minimum specified tensile strength of 540 MPa or higher. 3. Welded joints on high-pressure reactors made of austenitic stainless steel with a weld joint thickness exceeding 20 mm. 4. Welded joints on high-pressure reactors made of Cr-Mo low-alloy steel with a weld joint thickness exceeding 16 mm. 5. Stack

Principles for Selecting Bottom-Discharge Valves for Autoclaves

For high-pressure reactors with larger volumes, customers often request the installation of a valve at the bottom of the reactor to facilitate material discharge or reduce the number of times the reactor lid needs to be opened. For users, selecting the right type of valve is crucial, as using a valve that doesn't match the characteristics of the reaction materials can frequently lead to valve damage or excessive residual material remaining inside the reactor. Generally speaking, there are several types of valves commonly chosen for high-pressure reactors used by customers, with ball valves and gate valves (also known as top-and-bottom valves) being the two main options. Depending on the state of the material being discharged, ball valves are primarily used in reactors handling solid materials such as powders and granules. If the material temperature is too high...

Running a business with integrity for 18 years—Weihai Self-Control Reactor

High-pressure reactors and stainless steel reactors—Weihai Zikong Reactor Co., Ltd. was established in 1999 and is one of the leading manufacturers of magnetic high-pressure reactors and magnetic stirrers in China. With 18 years of industry experience, 18 years of accumulated business expertise, and 18 years of proven, reliable service, we are truly worthy of your trust. For the past 18 years, we have been dedicated to providing customers with specialized services in chemical reaction process screening, process development, and process optimization. Our products primarily serve the following key sectors: pharmaceutical and drug research and development, fine chemicals, petrochemicals, and other chemistry-related industries. We are committed to designing and manufacturing top-tier high-pressure reactors and comprehensive high-pressure reaction platform systems that can...

Instructions for the Pressure Test Method of Hydrogenation Reactors (Part 2)

In the previous issue, we discussed the testing methods used in the hydraulic pressure test of high-pressure hydrogenation reactors. Next, we’ll explain the pneumatic pressure test: 1. During the pneumatic pressure test, safety measures must be in place, and the gas used for the test should be dry, clean air, nitrogen, or other inert gases. 2. For high-pressure hydrogenation reactors made of a single material, the medium temperature during the pneumatic pressure test must not be lower than room temperature. For hydrogenation reactors with linings or composite layers, the medium temperature must not be lower than 15°C. 3. During the test, the pressure should be increased slowly—up to 10% of the specified test pressure, but not exceeding 0.05 MPa—and held at that pressure for 5 minutes, then...

Determinants of the Electric Heating Power of an Autoclave

In the process of determining the technical parameters for electrically heated autoclaves, one particularly important technical parameter is the heating power of the autoclave. Here, the editor will briefly introduce the issue of heating power in electrically heated autoclaves to help readers make informed choices. The factors that determine the heating power of an autoclave include the following: 1. The reaction medium inside the autoclave—especially for autoclaves with high reaction temperature requirements, it’s crucial to understand whether the reaction is exothermic or endothermic. 2. The size of the autoclave’s volume—this is easy to understand: when the autoclave’s volume is small, the required heating power is lower; conversely, a larger volume calls for greater heating power. 3. The pressure level required by the autoclave—for applications that demand high pressure...

Welding Process Requirements for Nickel-Plated High-Pressure Reactors

Nickel-based materials are highly resistant to corrosion by strong alkaline substances. They can be fusion-welded to carbon steel, low-alloy steel, high-alloy steel, as well as to other grades of nickel and nickel alloys, and can also be overlay welded on their surfaces. The specific welding procedures have the following requirements: 1. For fusion welding of nickel and nickel alloy linings in high-pressure reactors, tungsten inert gas (TIG) welding and metal inert gas (MIG) welding are commonly used. Plasma arc welding, as well as arc welding and submerged arc welding, may also be employed. 2. When welding nickel alloys containing chromium or molybdenum onto the inner walls of high-pressure reactors, it is essential that the weld joints exhibit excellent resistance to intergranular corrosion after welding. Therefore, TIG welding should be preferred whenever possible.