NOVELTY - The device comprises a middle-pressure benzene isopentane liquid inlet valve (1), a low-pressure benzene isopentane liquid inlet valve (2), a debenzolized isopentane controlling valve (3), a debenzolized isopentane recycling valve (4), a low-temperature natural gas liquid inlet valve (5), a low-temperature natural gas returning valve (6), a regeneration gas inlet valve, a regeneration gas returning valve, a debenzolized isopentane sampling valve, a heat exchanger condensate draining valve, an isopentane tank, a debenzolization tower, and a heat exchanger.    USE - The device is useful for recycling isopentane in debenzolization process at a low-temperature.    ADVANTAGE - The device is capable of simply and continuously recycling the isopentane.    DETAILED DESCRIPTION - The device comprises a middle-pressure benzene isopentane liquid inlet valve (1), a low-pressure benzene isopentane liquid inlet valve (2), a debenzolized isopentane controlling valve (3), a debenzolized isopentane recycling valve (4), a low-temperature natural gas liquid inlet valve (5), a low-temperature natural gas returning valve (6), a regeneration gas inlet valve, a regeneration gas returning valve, a debenzolized isopentane sampling valve, a heat exchanger condensate draining valve, an isopentane tank, a debenzolization tower, a heat exchanger, a temperature gauge, a safety valve, an automatic pressure reducing valve, a sampling opening, a fuel gas pipe, a low-temperature flash steam pipe, and a low-temperature natural gas pipe. The low-temperature natural gas pipe is connected to a lower part of one end of the heat exchanger. The low-temperature natural gas liquid inlet valve is mounted on the low-temperature natural gas pipe. The low-pressure benzene isopentane liquid inlet pipe is connected to a middle side of the heat exchanger. The low-pressure benzene isopentane liquid inlet valve is mounted on the low-pressure benzene isopentane liquid inlet pipe. A condensate drainage pipe is connected to a lower side of the other side of the heat exchanger. The heat exchanger condensate draining valve is mounted on a rear end of the condensate drainage pipe. A regeneration gas inlet pipe is connected to a middle part of the condensate drainage pipe. The regeneration gas inlet valve is mounted on the regeneration gas inlet pipe. The low-temperature flash steam pipe is connected to an upper side of one end of the heat exchanger. The low-temperature natural gas returning valve is mounted on the low-temperature flash steam pipe. The fuel gas pipe is connected to the upper side in the middle of the heat exchanger. The regeneration gas returning valve is mounted on the fuel gas pipe. The safety valve is mounted on the middle side of the heat exchanger. A backflow pipe is connected to the middle side of the debenzolization tower. A backflow valve is mounted on a rear end of the backflow pipe. One end of the middle-pressure benzene isopentane liquid inlet valve is connected to the middle side of the backflow pipe and the other end of the middle-pressure benzene isopentane liquid inlet valve is connected with the benzene isopentane liquid inlet pipe. The automatic pressure reducing valve and the middle-pressure benzene isopentane liquid inlet valve are mounted on the middle side of the middle-pressure benzene isopentane liquid inlet pipe respectively. The heat exchanger is connected with the isopentane tank via a debenzolized isopentane controlling pipe. The temperature gauge, the debenzolized isopentane controlling valve and the debenzolized isopentane recycling valve are mounted on the debenzolized isopentane controlling pipe. The sampling opening is arranged between the temperature gauge and the debenzolized isopentane controlling valve. The debenzolized isopentane sampling valve is mounted on the sampling opening.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a device for recycling isopentane.    Middle-pressure benzene isopentane liquid inlet valve (1)    Low-pressure benzene isopentane liquid inlet valve (2)    Debenzolized isopentane controlling valve (3)    Debenzolized isopentane recycling valve (4)    Low-temperature natural gas liquid inlet valve (5)    Low-temperature natural gas returning valve. (6)