An Overview of the Basic Knowledge of Hydrogenation Reactors

A hydrogenation reactor is a commonly used piece of equipment in industrial production. It is typically made from ferrous materials such as carbon steel, stainless steel, as well as non-ferrous metals like titanium, nickel, and zirconium. Its structure generally falls into two categories: open-type and closed-type. For small-scale hydrogenation reactors, an open-type flat-head flange structure is usually employed. However, for large-scale hydrogenation reactors, to reduce costs, a closed manhole structure is typically adopted.

　　Working principle of the hydrogenation reactor: High-speed stirring ensures thorough mixing of hydrogen gas, catalyst, and feedstock, thereby achieving a rapid reaction. The typical structure of a hydrogenation reactor features a gas distributor installed at the lower part of the reactor vessel. Hydrogen gas is introduced through the gas distributor from the bottom to the top of the vessel, where it thoroughly mixes with the feedstock. The stirring system generally employs a high-efficiency self-priming combination impeller. Specifically, the lower layer uses a propeller-type impeller, the middle layer uses a high-efficiency self-priming impeller, and the upper layer uses either a disc turbine or a propeller-type impeller. The shaft adopts a hollow shaft design. When the rotational speed reaches a certain threshold, a vacuum zone forms around the outer edge of the self-priming impeller blades. At this point, hydrogen gas from the top of the vessel, under pressure, flows along the hollow shaft toward the lower part of the equipment and, under conditions of high-speed rotation, is thrown into the feedstock, forming bubbles and ensuring thorough mixing. Common hydrogenation catalysts include palladium-on-carbon, nickel powder, or activated carbon. Typically, the catalyst settles at the bottom of the equipment. The propeller's function is to stir up the catalyst from the bottom near the head, causing it to circulate along the inner surface of the head and within the cylindrical chamber. This ensures that the catalyst comes into full contact with the feedstock throughout the reaction process, leading to more complete reactions and higher efficiency.

The high-pressure hydrogenation reactor involves a three-phase mixture of solid, liquid, and gas, and the uniformity of hydrogen gas dispersion is critical to the reaction. To accelerate the mixing rate of hydrogen gas, the following three methods are commonly employed:

1. The typical structure of a hydrogenation reactor features a gas distributor installed at the bottom of the reactor, through which hydrogen gas is thoroughly mixed with the material flowing in from the bottom of the vessel. 2. Our company employs an efficient, self-priming impeller. Its operating principle is that, at high rotational speeds, a vacuum zone forms around the impeller blades. Under the pressure differential, hydrogen gas from the top of the reactor is drawn into the material via the hollow shaft and the self-priming impeller, then rapidly ejected into the material to form bubbles. Common combination types include propeller-type self-priming inclined-blade turbines. The catalysts commonly used in hydrogenation reactions are palladium-on-carbon and nickel powder; these catalysts typically settle at the bottom of the equipment. The propeller’s function is to stir up the catalyst from the bottom of the reactor head and circulate it along the inner surface of the reactor head in a spiral motion, ensuring that the catalyst comes into full contact with the material throughout the reaction process, thereby making the reaction more complete and efficient. 3. Increasing the rotational speed: The rotational speed exceeds 250 rpm. The motor is an explosion-proof motor with an explosion-proof rating of DIICT4 and zero leakage. It can be designed and manufactured according to user-specific parameters such as temperature, pressure, and material properties.

Precautions for Using Hydrogenation Reactors: 1. When the first operator is working with the high-pressure reactor, at least one operator who is familiar with the reactor’s operation must be present. 2. Operators on site must wear cotton gloves and shoes without metal nails. 3. Do not bring lighters, MP3 players, or other items that could easily cause explosions or spontaneous combustion into the hydrogenation work area. 4. When operators are handling tools and parts near the hydrogenation equipment, they should handle them gently and avoid any rigid impacts that might generate sparks.