Abstract: Space cleaning device includes: hypochlorous acid water generator; mixing bath storing a mixture of the hypochlorous acid water and water; hypochlorous acid water supply unit; water supply unit; water level sensor detecting a water level of the water mixture; humidifying purifier micronizing the water mixture and releases the water mixture micronized into air; and control unit controlling operations of hypochlorous acid water supply unit and water supply unit. Control unit is configured, after supplying the hypochlorous acid water and the water to fill mixing bath with the water mixture, controls an operation of hypochlorous acid water supply unit to supply a predetermined amount of the hypochlorous acid water to mixing bath once in every predetermined time period, and controls an operation of water supply unit to supply the water to mixing bath based on information related to the water level of the water mixture received from water level sensor.

Abstract: The present invention aims to provide a regeneration method capable of sufficiently restoring the catalytic performance of a solid catalyst used in a dehydration reaction of lactic acid and derivatives thereof. The present invention relates to a method for regenerating a solid catalyst used in a dehydration reaction of lactic acid and derivatives of lactic acid, the method including a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam under pressure.

Abstract: The present invention aims to provide a regeneration method capable of sufficiently restoring the catalytic performance of a solid catalyst used in a dehydration reaction of lactic acid and derivatives thereof. The present invention relates to a method for regenerating a solid catalyst used in a dehydration reaction of lactic acid and derivatives of lactic acid, the method including a contacting step of bringing a solid catalyst containing a component that forms a molten salt in the presence of steam into contact with oxygen and steam under pressure.

Abstract: An intake apparatus for an engine is provided with an intake duct, arranged in an engine room, for supplying intake air to the engine. An auxiliary duct is connected to the intake duct and designed so that the intake air can be further introduced thereto. A valve unit is arranged in the auxiliary duct, for causing the auxiliary duct to communicate with the intake duct in a specific driving state requiring a high engine output.