| Alkali washing and electricity refining is the classic method used in the world for processing the straight-run diesel. Though qualified diesel and naphthenic acids can be obtained through this process, there are lots of problems, such as the use of strong acids, strong alkali that can not be recoveried, the charge for operation is high and severe corrosion in equipment The study of ammonia process for refining straight-run diesel is active in recent years at home and abroad. The solution that contains low molecular weight alcohol, ammonia and water is adopted in the process called as alcohol-ammonia method. This process resolves problems in the alkali washing and electricity refining process. There are many advantages. For example, the use of high voltage field and the strong acids and alkali is canceled, in addition, the process can be operated continuously and the solution can be recoveried without "three-waste". Therefore, this process is a promising method for refining oils. However, there are many problems in the ammonia method in which ethanol is used as demulsifing agent, such as the high volume ratio of the solution and oil, the high dosage of the ethanol, the high consume of energy and the high wastage of solution. To solve those said problems, complex solution method in which series of SW-demulsifier qualify to demulsification is adopted to substitute for alcohol-ammonia method in this paper. Accordingly, this paper mainly has an laboratorial research on deacidification of three kinds of straight-run diesel produced by Lanzhou Petroleum-chemical corporation. A lot of work has been done, for example, having selected the kind of demulsifier; having studied about operating parameters for refining diesel (Hunhe) including the solution makeup, react temperature and time, phase separation temperature and time, volume ratio of oil and solution, extraneous water and gathering filtration; having examined the adaptability of the best operating parameters of the diesel (Hunhe) for refining the diesel (Qinghai) and diesel (Changqing); having studied about recovering the soap and naphthenic acid; to analyse the quality of treated oil and naphthenic acid; having established series of control objectives and analysis method of ammonia method for refining diesel; having obtained the schedule drawing and laboratorial operating parameters. It shows that the two kinds of SW-1 and SW-2 demulsifier qualify to demulsification in the ammonia process for refining diesel. In addition, Experiment shows the new deacidification technology has many advantages, for instance, the ratio of the solution and the oil is low, the solution can be recoveried, the process can be operated continuously without "three-waste" and the consume of energy is low. What's more, the treated oil having acid number lower than 10mgKOH/100ml remains no solution and meets the standards of the diesel. |
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