A rectifying column for separating C17-C20 rare and precious metal high-efficiency extractant

Abstract

A kind of rectifying column for separating C17-C20 rare and precious metal high-efficiency extractant, a plurality of trays A and trays B are arranged in the interior of tower body according to longitudinal interval staggered, each adjacent tray A and tray B are arranged according to left-right symmetry, and each valve hole is provided with a float valve assembly for gas-liquid exchange;By setting the float valve assembly, the gas phase thrust pushes the valve cap to rise, the gas guide cone tip is designed as an inverted cone, which not only can guide and disperse the rising gas phase, avoid the gas phase to concentrate locally in the tray, but also make the gas phase uniformly contact with the liquid phase on the tray, increase the gas-liquid contact area, improve the mass transfer efficiency, facilitate the fine separation of C17-C20 components with close boiling points, the valve cap opening degree dynamically changes with the gas phase flow, the rising gas phase fully contacts with the liquid phase remaining on the tray after passing through the valve cap, the low-boiling-point component is enriched in the gas phase, and the high-boiling-point component is transferred to the liquid phase, to realize the preliminary separation of components.

Claims

1. A distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, comprising a column body (1), characterized in that: Inside the tower body (1), multiple trays A (2) and B (23) are arranged longitudinally at equal intervals. Each adjacent tray A (2) and tray B (23) are arranged symmetrically from left to right. A notch A is provided on the left side of the uppermost tray A (2). The downcomer A (3) is a fan-shaped structure and is set vertically. A cavity A (19) is provided inside the downcomer A (3). The downcomer A (3) is set at the notch and its upper end slightly extends out of the notch. The downcomer A (3) extending out of the notch forms a dam for the uppermost tray A (2). The lower end of the downcomer A (3) is fixed to the tray B (23). A liquid outlet is provided on the right side of the lower end of the downcomer A (3) that runs through the cavity A (19). A (12) is provided with a notch B on the right side of tray B (23). The downcomer B (20) and downcomer A (3) have the same structure. The downcomer B (20) is located at the notch B and its upper end extends slightly beyond the notch B. The downcomer B (20) extending beyond the notch B forms a dam for tray B (23). The lower end of the downcomer B (20) is fixed to another tray A (2). On the left side of the lower end of the downcomer B (20), there is a liquid outlet B (22) that penetrates the cavity B (21). Multiple valve holes (10) are arranged in an equidistant array in the middle of multiple trays A (2) and tray B (23). A floating valve assembly for gas-liquid exchange is provided on multiple valve holes (10).

2. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 1, is characterized in that: The floating valve assembly includes a valve cap (5) and a tube (11). An air outlet (7) is provided between the centers of the two ends of the tube (11). Sliding holes (13) are provided between the side walls of the tube (11) on opposite sides of the air outlet (7). A protruding ring (8) is sleeved on the upper part of the tube (11). The valve cap (5) is a hemispherical shell structure. A guide cone tip (6) is provided at the center of the ball socket of the valve cap (5). Sliding rods (4) are provided in the ball sockets of the valve cap (5) on opposite sides of the guide cone tip (6) and at the corresponding positions of the two sliding holes (13). The tube (11) is inserted into the valve hole (10). The protruding ring (8) is supported on the top of the tray A (2) at the edge of the valve hole (10). The two sliding rods (4) are slidably connected in the two sliding holes (13). The guide cone tip (6) is inserted into the top of the air outlet (7).

3. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 2, is characterized in that: The lower end of the slide rod (4) extends out of the slide hole (13), and an end (9) is provided at the lower end of the slide rod (4).

4. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 1, is characterized in that: An exhaust pipe (15) is provided at the top of the tower body (1), and a return pipe (14) is provided on one side of the upper part of the tower body (1).

5. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 1, is characterized in that: A liquid outlet pipe (17) is provided at the bottom of the tower body (1), and an air inlet pipe (18) is provided on one side of the lower part of the tower body (1).

6. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 1, is characterized in that: A feed pipe (16) is provided in the middle of the tower body (1).

7. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 2, is characterized in that: The protruding ring (8) has a frustum-shaped structure, and the valve cap (5) covers the outside of the protruding ring (8).

8. The distillation column for separating C17-C20 rare and precious metals using a high-efficiency extractant, as described in claim 1, is characterized in that: The cross-section of the straight edge at the top of both downcomer A (3) and downcomer B (20) is set to be arc-shaped.

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