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Starting from the raw materials, catalyst types and production processes, this paper reviews the domestic and foreign research progress of dodecyl mercaptan in recent decades, especially the impact on the raw materials, the advantages and disadvantages of catalysts and the production process involved in the synthesis of tert・do(lecyl mercaptan were compared and analyzed in detail・ At the same time, this paper puts forward suggestions and prospects on how to realize the localization of dodecyl mercaptan based on the development status of domestic ien-dodecyl mercaptan and upstream raw material dodecene. [ABSTRACT FROM AUTHOR]

This paper studies the generation and emission of VOCs in the shipping industry, and analyzes the means of raw material replacement, process control and end-of-pipe treatment adopted by the shipping industry to reduce VOCs.The process principles of adsorption technology, photocatalysis technology, non-thermal plasma purification technology, catalytic combustion technology and regenerative thermal oxidizer technology in VOCs end-of-pipe treatment technology are emphatically introduced.The characteristics and applicable scope of different adsorbents and different types of adsorption processes are compared, and the advantages, shortcoming and applicable conditions of different treatment technologies are expounded.Based on the characteristics and applicable conditions of VOCs treatment technology and the current situation of VOCs treatment in the shipbuilding industry, the appropriate treatment technologies are recommended in different generation links according to VOCs emissions. Several appropriate management opinions on VOCs emission are put forward so as to provide ideas and references for the effective treatment and up to standard emission of VOCs in the shipbuilding industry. [ABSTRACT FROM AUTHOR]

This paper reviews the application of industrial sludge in the preparation of fired bricks, light aggregates, concrete materials, cement and other building materials, summarizes the current problems of industrial sludge building materials and puts forward development suggestions. Industrial sludge can be used as a substitute for clay and other raw materials to produce fired bricks, fired light aggregates and cement through sintering process, and can also be added to cement and other gel materials to prepare concrete materials, unfired lightweight aggregates and other building materials through non-burning process. Using industrial sludge to prepare building materials has great development potential. [ABSTRACT FROM AUTHOR]

In this paper, carbon quantum dots was synthesized by one-step hydrothermal method using camphor leaves powder as the precursor, and a fluorescent method for Fe3+ detection was established by using it as the fluorescent probe. The results show that, at the excitation wavelength of 320 nm, the ratio of fluorescence intensity of CQDs solution after adding Fe3+ to CQDs solution without Fe3+ addition F/F0 and Fe3+ concentration shows a good linear relationship in the range of 2.72×10-5～1.00×10-4 mol/L(R²=0.9912), and the limit of detection is 8.16 μmol/L. When it is applied to the determination of iron content in iron supplements, the recovery rates of standard addition is 93.08%～105.05%. The preparation method of the carbon quantum dots is simple and fast, the raw material is environmentally friendly and easy to obtain, the method for Fe3+ detection has good linearity, high sensitivity and good selectivity, and the carbon quantum dots can be used for the analysis of iron content in actual iron supplements. [ABSTRACT FROM AUTHOR]

1,4_Bis(methoxymethyl) benzene is an important fine chemical raw material and synthesis intermediate, mainly used for the synthesis of polymer resins. This paper classifies the synthetic methods of 1.4-bis (methoxy methyl) benzene and summarizes the advantages and disadvantages of these methods. The 1.4-bis(chloromethyl) benzene route has the advantages of easy availability of raw materials, simple operation and high yield, but halogens will be converted into halide salts, which results in poor atomic economy and high post-processing costs. In the 1benzenedimethanol route, when dimethyl sulfate is used as the etherificating reagent, the by-products are mainly sulfuric acid and methyl sulfate, which are strongly irritating and corrosive, requiring suitable equipment; while dimethyl carbonate is used as the etherificating reagent, the catalyst is easily available and the by-products are mainly methanol and CO2, but the reaction conditions are harsh, requiring high temperature and high pressure. Dimethyl terephthalate is directly hydrogenated to prepare 1bis(me th oxy methyl) benzene route has the simple reaction steps, but it requires expensive catalysts, high temperature and high pressure. On the whole, dimethyl carbonate used as etherificating reagent reacts with 1,4-enzenedimethanol to transesterify and decarboxylate to produce 1,4-bis (methoxymethyl) benzene, doesnJ t introduce halogens, with low contamination degree. And the release of CO2 is conducive to promoting the positive reaction, bringing high product yield. This route has the prospect of realizing green industrialized production. [ABSTRACT FROM AUTHOR]

This paper mainly introduces the formation mechanism and growth mechanism of calcium sulfate whisker, expounds the raw materials, methods and application fields of the preparation of calcium sulfate whisker, analyzes the existing problems of different preparation methods, and puts forward the corresponding improvement measures. At the same time, the relationship between preparation and application is discussed, which provides scientific guidance for the future application of calcium sulfate whisker and the comprehensive recovery and utilization of resources. [ABSTRACT FROM AUTHOR]