| In the synthesis reaction of hydrogen chloride and acetylene, due to the characteristics of organic reactions, in addition to produce vinyl chloride, also generates dichloroethane, etc., relative to vinyl chloride of high boiling point material, through the vinyl chloride rectification tower, after the separation of a restructuring are collectively referred to as "the high boiling", in the original process design, the "high boiling" as a kind of industrial by-product usually sold to manufacturers have an aptitude for dangerous waste treatment, then through the further production, processing and recycling. As countries of dangerous waste and environmental requirements higher and higher, the enterprise to the requirement of increasing the recycling economy, clean factory, all kinds of waste resources in the process of chemical production also is able to recycle. "The high boiling" this worth recycling of industrial by-product also be fully used."The high boiling" consisting mainly of ethylene dichloride and vinyl chloride, including dichloroethane content is 40-50%, content of vinyl chloride in 50-60%. Dichloroethane for coatings, textile and other industries is a kind of very good industrial solvent, has the very high commercial potential, vinyl chloride is the production of PVC resin raw materials. The above both has the very high practical economic value. So "the high boiling" purification project, its economic benefits and environmental protection environmental benefits are very grab an eye, have also been national honor rewards.Zhongtai chemical existing two PVC production factory, with an annual output of 4000 tons of "high boiling" each. Based on "the high boiling" continuous quality monitoring, the statistics of each factory "high boiling" composition and production situation. And collect the equipment related to the purification of design parameters and process parameters. Finally through the simulation calculation, on the premise of choose DN16 metal pall ring filler, determine the rectifying column diameter of 500 mm, packing height 8 meters, equivalent plate height 0.4 meters, the theoretical plate number 20 layers, the top of the tower control the condensation temperature 10.21?, bottom reboiler control in 75.74?, feed speed is 913.24 kg/h,5.6 meters (from the top of the tower), feed position operating pressure 3.5 ATM.By running after constantly optimize the operation process and parameters, dichloroethane is relatively clear, isolated from the early late color slants yellow green, but the content does not change, at the same time separation tower resistance in driving up and down in the early 6 kpa, up to 125 kpa, analysis of separation tower packing congestion, according to the production cycle and product quality after adjustment, change regularly block filler. Realize the unit running smoothly for a long time. According to the analysis of experimental results, the tower vinyl chloride production is around 95% purity, bottom dichloroethane produced between 85-92% purity. In line with the existing equipment in the production of the demand for high boiling processing capacity. |
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