（4）出反应器的比例：   CH2Cl2:CHCl3=1:0.4（质量比）；

                        (CHCl3+CCl4)/CH2Cl2=0.45（摩尔比）；

（5）操作压力：  0.12MPa（表压）；

（6）反应器：    进口气体温度：65℃；

                 出口温度：130℃。

4. 设计原则

设计原则主要包括：产品的质量控制指标、安全、操作方便、投资省、便于安装等。

在本次设计中通过查阅了有关的文献资料后，确定了二氯甲烷合成的工艺路线和生产流程；继而针对年产4万吨二氯甲烷合成的设计任务进行相关的物料衡算和热量衡算，完成氢氯化反应器、氯化反应器、二氯甲烷吸收塔和二氯甲烷干燥塔等主要设备的设计和选型。在完成选型的基础上用AUTOCAD软件绘制带控制点的工艺流程图、车间设备布置图、二氯甲烷吸收塔的设计图和立面布置图，并编制和撰写设计说明书。

Process Design of Synthesis of Dichloromethane by Hydrogenation of 40,000 Tons of Methanol Design Manual Design Project: Process design for the synthesis of methylene chloride by an annual output of 40,000 tons of methanol.71776

The molecular formula of dichloromethane: CH2Cl2. Is a colorless, transparent, volatile liquid that has a similar ether odor and sweetness, does not burn, but mixes with high concentrations of oxygen to form an explosive mixture. Slightly soluble in water, with the vast majority of commonly used organic solvents miscible, and other chlorine solvents, ether, ethanol can also be any proportion of miscible. Dichloromethane has the advantage of strong dissolving power and low toxicity. The lowest pyrolysis temperature in dry air is 120℃, the pyrolysis temperature decreases with the increase of water content, and pyrolysis mainly produces hydrogen chloride and trace phosgene. Long-term heating with water to produce formaldehyde and HCl. In the presence of iron and metal chlorides at 300 to 450℃, methylene chloride tends to be coking in the gas phase to produce a black solid polymer. Further chlorination, available chloroform and carbon tetrachloride. Toxicity is very small, and poisoning after the rapid recovery; irritation of the skin and mucous membranes. Dichloromethane is an excellent organic solvent, with a high solubility, low boiling point, noncombustible and very low toxicity and so on. It is widely used as a solvent and is also used for the extraction of naturally occurring heat-sensitive substances. It is also used in the pharmaceutical industry, in the manufacture of steroids, antibiotics and vitamins. It can be used as a low pressure propellant aerosol along with F-12. In the industrial cleaning operation is also a lot of applications.

1. Design the task source

  Dichloromethane is mainly used for film film solvents, pharmaceuticals, pesticides, paint remover, binder solvent, but also for metal cleaning and electronic cleaning industry. In recent years, it has been used as a raw material for HFC32 (HFC is a hydrofluorocarbon compound). The world's consumption of dichloromethane are very large, both at home and abroad on its production and application have made a lot of research results. This design is for the preparation of methylene chloride methanol hydrochloride production process research.

2. design standards

  The design of the chemical design and reference to the relevant national standards and regulations to determine the process of dichloromethane synthesis process, process and process parameters.

（1） route selection

  The production methods of methylene chloride are methane thermal chlorination method，me-

-thanol method, chlorine oil method, acetaldehyde method, carbon disulfide method and ethylene,