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Abstract: The purpose of this article is to review the preparation of cyclic carbonates, catalyst types and the application of cyclic carbonates in fine chemicals. It is intended to provide a reference for expanding the application of cyclic carbonates in related fields. Firstly, the preparation of cyclic carbonate is summarized, and the most efficient preparation method today - carbon dioxide and epoxide cyclic carbonate method is described, including alcohols, alkenes and ethers are described in detail, and the phosgene method is briefly outlined, etc. Secondly, the catalyst types of carbon dioxide and epoxide are listed, and the applications of cyclic carbonate in fine chemicals are summarized. Secondly, the types of catalysts used in the carbon dioxide and epoxide epoxy carbonate method are listed, and the types of photocatalysis, electrocatalysis, ionic liquid catalysis, and low eutectic solvent catalysis are elaborated in detail, among which the titanium oxide catalysts, the carbon composite catalysts, the metal/covalent organic frameworks (MOFs/COFs) catalysts, and covalent organic frameworks with semiconducting properties are described in the photocatalysis, Photosensitive small molecule compound catalysts and many other types are elaborated. The results show that different catalysts have a great impact on the reaction yield and have different impacts on the environment, etc., and it is important to find efficient and green catalysts. Then, the current status of cyclic carbonates in fine chemistry is described in detail. Cyclic carbonates are thermally stable, low toxicity and easily biodegradable. Therefore, they have a wide range of applications and are mainly used as solvents for various products, such as lithium-ion batteries, detergents and degreasers, industrial lubricants and fuel additives. The application of cyclic carbonates in biomaterials, polyurethane (PU) foam made of cyclic carbonates, and hydroxy polyurethanes made of cyclic carbonates are mainly elaborated in detail. Finally, it summarizes the current status of cyclic carbonate and looks forward to the future development direction of cyclic carbonate.Abstract: The purpose of this article is to review the preparation of cyclic carbonates, catalyst types and the application of cyclic carbonates in fine chemicals. It is intended to provide a reference for expanding the application of cyclic carbonates in related fields. Firstly, the preparation of cyclic carbonate is summarized, and the most efficient prepa...Learn More
Abstract: Limestone (CaCO3) is one of the most common minerals on Earth, widely used in industries such as construction, chemical, metallurgical, and environmental protection. With the advancement of technology and the diversification of demand, the deep-processed products of limestone, such as nano calcium carbonate, light calcium carbonate, activated calcium oxide, ultra-fine calcium hydroxide, etc., have become indispensable and important materials in modern industry. However, limestone raw ore often contains different kinds of impurities (such as magnesium (Mg), silicon (Si), iron (Fe), aluminum (Al), sulfur (S), etc.), which have a significant effect on the performance and quality of limestone deep processed products. This paper will investigate the distribution and existence state of main impurities in limestone ore through SEM and EDS characterization methods, review and analyze the effects of five common impurities in limestone ore - Mg, Si, Fe, Al, and S - on the production of different deep-processed products such as nano calcium carbonate, light calcium carbonate, activated calcium oxide, ultra-fine calcium hydroxide, lime, and cement. By exploring the occurrence and reaction mechanism of these impurities, understanding their effects on the production process, as well as a summary of impurity removal techniques, to provide a reference for the efficient utilization and optimization of limestone.Abstract: Limestone (CaCO3) is one of the most common minerals on Earth, widely used in industries such as construction, chemical, metallurgical, and environmental protection. With the advancement of technology and the diversification of demand, the deep-processed products of limestone, such as nano calcium carbonate, light calcium carbonate, activated calci...Learn More
