Styrene is allowable concentration in air is 0.1 ml/L. High concentration, contact time is too long, have certain harm to human body. Styrene is prone to cracking at high temperatures and combustion. Styrene vapor mixture can form explosive mixtures with air, the explosion range of 1.1 ~ 6.01% (volume fraction).
    Styrene (SM) has the properties of vinyl olefins, reaction performance is extremely strong, styrene exposed to air, easily oxidized and become aldehyde and ketone. Structurally is asymmetric replacing styrene, vinyl gene with polarity and aggregation easily. Aggregated in the higher than 100 ℃, even also can produce slow polymerization at room temperature. Therefore, styrene monomer in storage and transportation must join the polymerization retarder, and pay attention to the use of inert gas seal, do not make the contact with air.
    Styrene (SM) is one of the important monomer synthesis high polymer industry, it not only can the get together for polystyrene resin, also easy and acrylonitrile copolymer AS the AS the plastic, and butadiene copolymer of styrene butadiene rubber, butadiene and acrylonitrile copolymer for ABS plastic, also with maleic anhydride, ethylene glycol, such AS phthalic anhydride copolymer AS a polyester resin and so on. By the copolymerization of styrene plastic can be processed into a variety of daily necessities and engineering plastic, use very extensive. At present, two-thirds of its output for the production of polystyrene, a third for the production of all kinds of plastic and rubber.
1 The source task
    The design for the preliminary process design of an annual output of 40,000 tons of dimethyl ether, the basic course of study based on rational design process, select the appropriate process equipment. In the design specification, a brief performance of dimethyl ether, the main purpose, production status and development trends, to determine the dehydration of methanol vapor as the design process production methods. In the disign process, according to the requirements of the design task book, material balance and heat balance to determine the equipment, process parameters and consumption process indecators, while the safety of dimethyl ether production process pqy attention to issues and the “three wastes” treatment madeinstructions.Drawing of the design drawings, design drawings including process flow diagrams, major equipment drawings, equipment layout diagrams.
2 Design Standards
This design with reference to the following national standards and regulations.
（1） Production of dangerous goods and harmful factors in classification and code.(GB/T13816-1992)
（2） Dangerous chemical commonly used in the classification criteria. (GB13690-1992)
（3） Typical hazards of the chemical mediator in the pressure vessel and the degree of explosion hazard classification.(HGJ43-1991)
（4） Factory fire safety requirements.(GBJ16-1987)
（5） The provisions of the integrated wastewater discharge.(GBJ8978)
（6） Steel pressure vessel.(GB150)
（7） Shell and tube heat exchanger standard.(GB151)
（8） Process system equipment layout design requirements.(HG20570)
（9） Chemical plant piping layout design requirement.(HG/T20549
Keywords: styrene; ethylbenzene;Process design



目录                                                                     1 概述…1
  1.1 苯乙烯的性质和用途1
  1.2 原料的主要性质与用途…1
     1.2.1 乙苯的主要性质… 1 年产6万吨乙苯脱氢制苯乙烯工艺设计(2):http://www.751com.cn/huaxue/lunwen_6256.html