The invention discloses a novel filtering and concentrating device and a main reaction kettle device. The novel filtering and concentrating device comprises a cylinder body A, a cylinder body B, a gear motor A, a gear motor B, a stirring
paddle A and a stirring
paddle B, and further comprises a drain valve A, a drain valve B, a final concentrated product outlet A and a final concentrated product outlet B, wherein the gear motor A and the gear motor B are arranged at the top ends of the cylinder body A and the cylinder body B, the stirring
paddle A and the stirring paddle B are arranged in theinner parts of the cylinder body A and the cylinder body B, the drain valve A and the drain valve B are arranged at the bottom ends of the cylinder body A and the cylinder body B; a
nitrogen inlet, aregenerated liquid inlet and a spraying water inlet are arranged at the top end of the cylinder body A, an annular
filter element is arranged on the inner wall of the cylinder body A, a back flushingport and a
clear liquid outlet connected with the bottom part of the
filter element and a filtered concentrated liquid outlet connected with a main reaction kettle are arranged on the side wall of thecylinder body A, a
raw material feed port is arranged at the top end of the cylinder body B, an overflow port is arranged on the side wall of the cylinder body B and communicates with a middle tank,and the middle tank communicates with the top part of the filtering and concentrating device. The structure design of the novel filtering and concentrating device is more advanced and more reasonable,the mounting, dismounting and maintaining are simple and convenient, the problems of layering, shaking, sealing and the like of material liquid are effectively solved, and the filtering
fineness is higher.