Patent RU-2762260-C1 (RU)
Title: Method for producing (meth)acrylic acid or an ether thereof
Inventor: NAKAMURA MASANARI
IPC: B01D3/34
Filed: 2019-01-17
Granted: 2021-12-17
Abstract: FIELD: chemistry. 
     SUBSTANCE: present invention relates to a method for producing (meth)acrylic acid or an ether thereof, including a stage executed at a reduced pressure created by a pressure reduction apparatus, producing distillation gas from a process fluid containing (meth)acrylic acid or an ether thereof, and providing a possibility of converting the distillation gas into a condensate in a vertical multi-pipe heat exchanger. The method for producing (meth)acrylic acid or an ether thereof includes a stage executed at a reduced pressure created by a pressure reduction apparatus, producing distillation gas from a process liquid containing (meth)acrylic acid or an ether thereof, and providing a possibility of converting the distillation gas into a condensate in a vertical multi-pipe heat exchanger, wherein the vertical multi-pipe heat exchanger comprises a tubular body, an upper pipe plate and a lower pipe plate, located on the side of the upper end and on the side of the lower end of the tubular body, respectively, multiple heat exchanger tubes installed between the upper pipe plate and the lower pipe plate, an upper cover installed on the upper side of the upper pipe plate, a lower cover installed on the lower side of the lower pipe plate, a receiving chamber formed by the upper pipe plate and the upper cover, an extraction chamber formed by the lower pipe plate and the lower cover, a connecting hole in the lower cover, attached whereto is a suction pipe connecting the vertical multi-pipe heat exchanger and the pressure reduction apparatus, and a baffle installed in the extraction chamber and provided with a vertical part facing the connecting hole, and the distillation gas and a liquid containing a polymerisation inhibitor are supplied to the receiving chamber, the distillation gas is cooled during the passage in the heat exchange tube, forming a condensate, the condensate and the non-condensed distillation gas enter the extraction chamber, the area of the vertical part of the baffle is greater than the area of the connecting hole, the upper part is intended for connecting the upper edge of the vertical part of the baffle and the inner wall of the lower cover, the non-condensed distillation gas in the extraction chamber enters the transitional space surrounded by the baffle and the inner wall of the lower cover and exits through the connecting hole from the transitional space into the suction pipe, the liquid containing the polymerisation inhibitor is sprayed in the form of drops through a spray nozzle in the receiving chamber, such a spray nozzle is used a spray nozzle, wherein the average Sauter diameter of a water drop is within the range from 570 to 1,500 mcm and the average flow rate of non-condensed distillation gas entering the transitional space from the extraction chamber is 15.0 m/s or less, when water is sprayed from the spray nozzle under the same conditions as in the case of spraying a liquid containing the polymerisation inhibitor from the spray nozzle in the receiving chamber. 
     EFFECT: production of (meth)acrylic acid or an ether thereof using a vertical multi-pipe heat exchanger. 
     11 cl, 3 ex, 11 dwg