首页>
外国专利>
IMPROVED DEWAXING AND WAXING FILTERABILITY BY REDUCING SCRAPER SPEED IN COOLING DEVICE EQUIPPED WITH SCRAPER
IMPROVED DEWAXING AND WAXING FILTERABILITY BY REDUCING SCRAPER SPEED IN COOLING DEVICE EQUIPPED WITH SCRAPER
展开▼
机译:通过减少装有刮刀的冷却设备中的刮刀速度,提高了脱蜡和蜡的过滤性
展开▼
页面导航
摘要
著录项
相似文献
摘要
A hydrocarbon oil dewaxing process comprises passing the waxy oil through a staged vertical tower, injecting cold solvent at a plurality of stages along the vertical tower under conditions of high agitation to achieve substantially instantaneous mixing at each point, continuing the chilling, preferably at a rate of from 0.55 to 4.44°C (1 to 8°F) per minute, by means of cold solvent injection until a temperature above the filtering temperature but less than 22.2°C (40°F) above the filtering temperature is reached. The oil is subsequently cooled to the wax separation temperature in rotating-element scraped-surface chillers. The operating speed of the rotating elements in the scraped surface chiller is in the range of from 8 to 14% of the original design operation speed. Operation at this reduced speed improves wax separation rates by about 10 to 20%while not substantially adversely affecting the heat transfer performance of the chillers.
展开▼