Marine Pyrrole Alkaloids

Nitrogen heterocycles are essential parts of the chemical machinery of life and often reveal intriguing structures. They are not only widespread in terrestrial habitats but can also frequently be found as natural products in the marine environment. This review highlights the important class of marine pyrrole alkaloids, well-known for their diverse biological activities. A broad overview of the marine pyrrole alkaloids with a focus on their isolation, biological activities, chemical synthesis, and derivatization covering the decade from 2010 to 2020 is provided. With relevant structural subclasses categorized, this review shall provide a clear and timely synopsis of this area.

Selection and Application of Materials in Chemical Machinery Design

Materials used in the design of chemical machinery are an indispensable part of industrial production, and chemical machinery materials are also the main basis of chemical production.Chemical mechanical properties can directly determine the quality of products in chemical production, and their materials also determine the quality of chemical mechanical properties. Selecting corresponding materials has become the core of chemical mechanical design.Therefore, in the design of chemical machinery, there is a special value for the selection of materials used in manufacturing.

Research on Excellent Engineer of Chemical Machinery Cultivating System

The research and formulation of chemical machinery excellent engineer cultivation system is an important basic work to realize the plan of cultivating excellent engineer. Take the process equipment and control engineering profession of our university as example, this paper introduces professional status, analyses and discusses cultivation target, opportunity and facing problems of machinery excellent engineer.

The Application of Extruder in Chemical-Machinery Pulping Production and the Influence of the Wastewater Biochemical Treatment

Traditional chemical-machinery producing mainly took the refiner as the primary refining equipment. Extrusion pulping was the reformation of traditional refining pulping. The different equipments and processes resulted in the different characteristics of wastewater inevitably. This article aimed to compare the characteristics and biochemical treatment methods between conventional chemical-mechanical pulping and extrusion pulping, and then discuss the biochemical treatment advantages of extrusion pulping wastewater. The result shows that: the wastewater from the extrusion pulping has lower concentration of tiny fiber, load suspended matter, wastewater temperature and effluent discharge. And thus make a simpler process, a lower cost and a better effect of the wastewater treatment.