Solid-liquid separation device

A solid-liquid separation device that performs dehydration or deoiling from an object to be treated that is a mixture of water and a solid, a mixture of oil and a solid, or a mixture of water, oil, and a solid, as the object to be treated, using a substance A capable of dissolving water and oil, the solid-liquid separation device comprising:

• a substance B that is circulated while generating phase change in a closed system;
• a compressor that compresses the substance B;
• a first heat exchanger that exchanges heat of condensation of the substance B and heat of evaporation of the substance A;
• expansion means that decompresses the condensed substance B;
• a second heat exchanger that exchanges heat of evaporation of the substance B and heat of condensation of the substance A;
• and
• a treatment tank in which the substance A is mixed with the object to be treated, the substance A having been evaporated while separated from the water or the oil in the first heat exchanger, and condensed in the second heat exchanger, wherein
• a center of gravity of the first heat exchanger is installed in a lower portion than a center of gravity of the second heat exchanger in a vertical direction.