In published research papers, researchers have clarified the path and mechanism of lignin degradation reactions under high pressure hot water conditions. According to this reaction path, lignin can be completely degraded into phenol oil and can be further processed into bioplastics, chemicals and biofuels.
Lignin is a polymer composed of phenols and has long been considered as the most stable and most difficult to degrade by biological and thermal conversion methods. Fiber alcohol and waste from paper mills contain a lot of lignin. This study is of great significance for the recycling of lignin.
The formal name of Blind Flange is flange cover, and some are also called blind flange or pipe plug. It is a flange without a hole in the middle, which is used to block the pipe mouth. It has the same function as the head and the pipe cap, except that the blind plate seal is a detachable sealing device, and the head seal is not ready to be opened again. There are many types of sealing surface, including plane, convex, concave convex, mortise and groove surface and ring connection surface. The blind plate is mainly used to completely isolate the production medium, prevent the production from being affected or even cause accidents due to the loose closing of the shut-off valve. The blind plate shall be set at the part requiring isolation, such as the nozzle of equipment, the front and back of shut-off valve or between two flanges, and it is often recommended to use the spectacle blind plate; the plug-in plate (circular blind plate) can also be used for the part requiring one-time use such as pressing and purging.
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