Hydrocarbon Emissions Reduction from Ethylene Dichloride Processes.

摘要

The report gives results of the initial phase of the development of a low-emissions ethylene oxyhydrochlorination process for producing 1,2-dichloroethane (ethylene dichloride). First,experimental work on an existing pilot-plant-scale,once-through process was used both to obtain baseline emission data in mass of hydrocarbon (HC) plus ethylene dichloride (EDC) per mass of HCl fed as a function of reactor temperature and percent excess ethylene to the reactor,and to resolve potential problems which may arise in a recycle operation. Second,the existing once-through pilot plant was converted to a recycle operation which then functioned successfully and yielded emission data in mass of HC plus EDC per mass of HCl fed as a function of reactor temperature and percent excess ethylene to the reactor. In particular,the project objective of reducing by 90% the HC plus EDC emissions from an ethylene oxyhydrochlorination process,through the recycling of reactor off-gases,was positively demonstrated. Third,various operating difficulties were assessed which would be important for future control applications and scale-up efforts. Economic analyses are presented to demonstrate the competitive position of the improved process.