Liquid extract production system and method for producing liquid extract

A liquid extract production system, comprising:

• a processing liquid tank for storing a processing liquid,
• an extractor for extracting a liquid extract from extraction raw materials,
• a liquid extract tank for storing the liquid extract,
• a first flow path of the processing liquid that connects the processing liquid tank and the extractor,
• a second flow path of the liquid extract that connects the extractor and the liquid extract tank,
• a flow meter positioned in the second flow path for measuring the flow rate of the liquid extract in the second flow path,
• a density meter positioned in the second flow path for measuring the solid content concentration of the liquid extract in the second flow path,
• a solid content calculation unit for calculating the solid content included in the liquid extract that flowed through the second flow path based on the measured flow rate and solid content concentration,
• a first liquid transfer pump positioned in the first flow path for controlling the transfer of processing liquid from the processing liquid tank to the extractor,
• a second liquid transfer pump positioned in the second flow path for controlling the transfer of the liquid extract from the extractor to the liquid extract tank,
• a liquid transfer controller for (i) controlling the first liquid transfer pump based on the calculated solid content relative to a first reference value of solid content and (ii) controlling the second liquid transfer pump based on the calculated solid content relative to a second reference value of solid content,
• wherein when the second reference value of the solid content that is greater than the first reference value of the solid content, the liquid transfer controller is configured to control the second liquid transfer pump to cut off the second flow path and stop liquid transfer from the extractor to the liquid extract tank,
• wherein pressure is applied to the interior space of the extractor,
• wherein the liquid extract in the second flow path is transferred from the extractor to the liquid extract tank under the pressure,
• wherein the density meter measures the refractive index of the liquid extract, and
• wherein the density meter calculates the Brix of the liquid extract based on the measured refractive index.