The invention discloses a purification method for deep
dehydration and
impurity removal of olefin by full-temperature range adsorptive extraction. The purification method is characterized in that crude olefin feed gas (liquid) enters a gas /
liquid phase adsorption process, an extraction and
desorption process and an extracting agent regeneration process sequentially,
moisture and trace
impurity components are absorbed by an absorbing agent, and an olefin product with a purity of more than or equal to 99.9-99.99 percent (v / v) flows out from the top of an adsorption
tower; after the adsorption process is completed, an extracting agent is introduced into the adsorption
tower for the extraction and
desorption process to dissolve out the
moisture and the trace
impurity components. Extraction anddesorption gas enters the extracting agent regeneration process, and the extracting agent is recovered and recycled
after treatment. The purification method disclosed by the invention has the benefits that by adopting an adsorption-extraction and
desorption process and in combination with an adsorption mechanism and an extraction and desorption dissolving mechanism, the whole operation process ismore stable and
safer, the
energy consumption is low, the product purity is high, the equipment
investment cost is low, the purity of the olefin product is more than or equal to 99.9-99.99 percent, and the yield is more than or equal to 99 percent.