Abstract: To provide a technology capable of stabilizing droplets. Provided is a particle isolation device or the like including: a vibration unit that applies vibration to a fluid containing sheath liquid by supplying a driving voltage based on each of a plurality of frequencies; an imaging unit that acquires, at a position where the fluid is formed into droplets through the vibration, an image of the fluid and each of the droplets; a liquid temperature control unit that controls a liquid temperature of the sheath liquid; and a frequency control unit that acquires data regarding a state of the droplet at each of the frequencies per liquid temperature of the sheath liquid from the image captured by the imaging unit, and controls the frequency of the driving voltage on the basis of a variation in the data accompanying a change in the liquid temperature of the sheath liquid.

Abstract: A wet process for the desulfurization of exhaust gas comprising the following operation steps so as to eliminate and recover sulfur dioxide from exhaust gas containing it:(A) a step of absorbing sulfur dioxide by contacting exhaust gas with an absorbent mainly containing potassium salts of tartaric acid having a pH value of 4.5-6.5,(B) a step of recovering sulfur dioxide by drawing out a part of the absorbent in the step (A) and heating it to liberate and recover sulfur dioxide,(C) a step of circulating the absorbent by cooling the absorbent from the step (B) to a temperature suitable for the absorption of exhaust gas and recycling it to the step (A).