Study On Process Design And Economic Analysis Of ABS Device

ABS, as one of the five major resins, has multiple superior properties, namely impact resistance, thermal resistance, low temperature resistance, chemical resistance and excellent electrical performance. In addition, ABS is also a type of material with many advantages in processing such as mechanical processing, coating, painting as well as secondary processing involving surface metallic coating, electroplating, welding, hot-pressing and adhesive bonding etc. Stability in size and lustrous surface of ABS products make it a widely-used engineering thermoplastic in mechanical manufacturing, auto industry, electronic and electrical appliance production, instrument and apparatus assembly, and textile and building fields. In recent years, the domestic capacity of ABS production is on a rapid increase, yet there still exists a big demand gap in ABS resins, especially the special ones with high performance and high additional value. This problem will be completely solved through ongoing ABC unit expansion, innovation in process technology and R&D independently step by step.There are currently two main methods in ABS production in China-Emulsion grafting bulk blending method (SAN) and continuous bulk polymerization method. One of them is also adopted by most advanced ABS manufacturer overseas, and some companies even own these two methods both. Continuous bulk polymerization method as a new emerging technology gives full play to its advantages in lowering production cost and environment protection, and is becoming the focus of technological researches in the future.The graduation thesis pertaining to design of ABS device is accomplished based on an actual marketing survey comparing ABS product demand at home and overseas, as well as data from one existed chemical plant using SAN method. In light of the collected data, mathematical models are established, necessary calculations regarding material balance, heat balance are completed. Calculations concerning poly-reactor such as its type selection, volume and jacket calculations, agitator design and reactor structural drawings are finished. Pump calculations are accomplished in terms of head loss, lift and shaft power in order to fix the type selection. Exchanger calculations ranging from body calculations to type selection and structural design drawings are done as well. On the basis of above-mentioned work, the drawings of process diagram and the compilation of equipment data sheet are completed. Furthermore break-even analysis of ABS device are also finished through economic methods like liquid capacity estimation, cost estimation and the balance between sales revenue and taxes and margins. The idea of design has been incorporated into the thesis with the integration of theory and practices, and the in-depth understanding and bettered process diagram, and it will provide valuable reference to similar units. From a greater point of view, the work is done in an effort to achieve feasibility in economy and stability in production and also endeavor to push forward technical improvement and effectively save national funds and resources.