The design philosophy of control system revamping for large-scale ethylene plant is presented,and the hardware configuration and the application software customization in control system are introduced.

Setting of superheated extent of refrigerant vapor and its influence on system design in ethylene plants;

Application of ternary refrigeration to ethylene plant;

Treatment of waste alkali liquor in ethylene unit by atmospheric oxidation process;

Design and operation of primary fractionation system in ethylene unit;

Water quality optimization of process water system in ethylene unit;

In order to decrease energy in styrene unit,thermodynamic methods were used to analyze the energy consumption based on the mathematical simulation.

By hazard identification of materials,production facilities in styrene unit,this paper analyzes their risk way to enter the outside environment,as well as the external environment caused by environmental impact,develops some simple preventive measures.

This paper introduces model building of CAD-HAZOP and its analysis process in the styrene unit.

The process parameters including discharge time of the product discharge system,purge gas flow of the degassing warehouse and concentration of isopentane in the reactor were optimized by analyzing the causes of the high consumption of condensing agent isopentane in the polyethylene plant.