The chemical production process in this workshop can generally be summarized into three main steps: ① Raw material treatment In order to make raw materials reach the state and specifications required by chemical reaction, different raw materials need to be purified, concentrated, mixed, emulsified or crushed (for solid raw materials) according to specific conditions. ② Chemical reaction This is the key step in production. The pretreated raw materials react under certain conditions, such as temperature and pressure, to achieve the required reaction conversion and yield. There are many types of reactions, such as oxidation, reduction, metathesis, sulfonation, isomerization, polymerization, roasting and so on. Through chemical reaction, the target product or its mixture is obtained. (3) product refining: separating the mixture obtained by chemical reaction, removing by-products or impurities, and obtaining products meeting the composition specifications. Each of the above steps needs to complete the required chemical and physical transformation under specific equipment and specific operating conditions. Edit this paragraph of chemical production technology Chemical production technology is usually put forward for certain products or raw materials, such as the production of vinyl chloride, the synthesis of methanol, the production of sulfuric acid, coal gasification, etc. Therefore, it has the particularity of individual production; However, its contents generally involve the following aspects: selection of raw materials and production methods, process organization, functions of equipment (reactor, separator, heat exchanger, etc.). ), structure and operation, the influence of catalysts and other materials, the determination of operating conditions, production control, product specifications and separation and utilization of by-products, safety technology and technical economy. The realization of modern chemical production applies basic scientific theories (chemistry, physics, etc.). ), chemical engineering and its principles and methods, as well as the knowledge and technology of other related engineering disciplines. The main development trends of modern chemical production technology are: large-scale production of basic chemicals, full utilization of raw materials and by-products, adoption of new raw material routes and new catalysts (including new reactions), reduction of energy consumption, prevention of environmental pollution, automation of production control and optimization of production. Early chemical production depends on experience, which can be called handicraft industry. In the long-term development of production and science, chemical production has gradually changed from manual production to modern production technology based on scientific theory. However, due to the complexity and diversity of substance transformation in chemical production, empirical production technology still exists. From the above development, the name of chemical process is only applicable to chemical production that is still based on experience. In the curriculum of colleges and universities, there are industrial chemistry and chemical technology, but the names of the two courses are different, and the contents are generally similar to the general contents of the above chemical production technology. In order to adapt to the rapid development of China's chemical industry, most colleges and universities in China have basically set up the important major of chemical technology. Business training aims to train senior engineering and technical personnel engaged in the design, operation and research and development of chemical production. Business training requires students of this major to learn the principle, operating conditions, technological process and equipment design of chemical products made from petroleum, coal, natural gas and ore through chemical processes such as transformation, separation and synthesis. Graduates should acquire the following knowledge and abilities: 1. Master the basic theories of chemical unit operation, chemical reaction engineering and separation engineering; 2. Master the basic principles of chemical production, the basic theories, basic knowledge and design methods of production technology and equipment; 3. Have the ability to design chemical production processes and equipment; 4. Have the preliminary technical and economic analysis and production management ability of chemical production; 5 have the preliminary ability to research and develop new chemical production processes, new equipment and new technologies. The main subjects include physical chemistry, chemical engineering principles, chemical engineering and chemical design. Main courses: physical chemistry, chemical engineering principle, chemical thermodynamics, chemical reaction engineering, chemical separation engineering, chemical technology, coal chemical industry, catalytic principle, inorganic chemistry and organic chemistry. The practical links include metalworking practice, production practice (cognitive practice, graduation practice), computer application and computer practice, course design (mechanical basis of chemical equipment, chemical principles), professional experiment and graduation design (thesis). Employment graduates can engage in chemical process and equipment design, new product and new technology development, system decision and optimization, enterprise technology management and related scientific research and teaching in inorganic chemical industry, environmental protection, cementing materials, metallurgy, energy and other departments. Award a bachelor's degree in engineering. Similar professional chemical engineering, fine chemical industry.

Vacuum pump is a rotary variable displacement vacuum pump, which can only be used with the cooperation of the front pump. It has a large pumping speed in a wide pressure range and is insensitive to dust and water vapor in the pumped gas. Widely used in metallurgy, chemical industry, food, electronic coatings and other industries. Flow rate and vacuum degree are the two most important factors in selecting suitable vacuum products. First of all, the flow determines the size of the product. The higher the flow rate, the larger the product volume and the higher the motor power required. Second, the vacuum degree determines the structure of the product. There are two readings of vacuum degree: gauge pressure and absolute pressure.