Patent ID: 8592627

Claim:
A process for producing (meth)acrylic acid, comprising the steps of: supplying a cooling medium to a crystallizer from a heat source device, thereby crystallizing (meth)acrylic acid from a crude (meth)acrylic acid solution; and discharging the cooling medium from the crystallizer and returning the cooling medium to the heat source device; wherein: temperature of the cooling medium returned to the heat source device is maintained constant by a first adjustment operation or a second adjustment operation; the first adjustment operation is performed by feeding at least a part of the cooling medium to be returned to the heat source device from the crystallizer into an upper part of a first buffer tank and discharging the cooling medium from a lower part of the first buffer tank to return to the heat source device; and the second adjustment operation is performed by feeding at least a part of the cooling medium to be supplied to the crystallizer from the heat source device and/or the cooling medium to be returned to the heat source device from the crystallizer into the lower part of the first buffer tank and discharging the cooling medium from the upper part of the first buffer tank to return to the heat source device.