DISC-SHAPED SCRUBBER Russian patent published in 2019 - IPC B01D47/06 B01D53/18 C07C5/333 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of petrochemistry and can be used, in particular, in the processes of obtaining olefinic hydrocarbons used in the production of synthetic rubbers, plastics, high-octane components of gasoline and other organic products. Disc-shaped scrubber, irrigated with water, is proposed for cooling and cleaning contact gas in the olefinic hydrocarbon production processes by dehydrating the corresponding paraffinic hydrocarbons, including vertical cylindrical housing 1, comprising a contact gas injection unit located in the lower bottom of the housing in the form of central pipeline 2 with baffle 4 located above its upper edge 3, dead tray 5, separating scrubber housing 1 to the first stage of contacting contact gas 6 and the water scrubber supplied for irrigation in the lower part of the scrubber and second stage 7 — in its upper part, and representing a horizontal partition with cup 8 located in the central part along the axis of housing 1, having baffle 10 along the contact gas above its upper edge 9, each stage of contact 6, 7 has circulation pipeline 13, 16, equipped with pump 11, 12 for independent circulation of water through these stages of contact 6, 7, moreover, the pipeline 13 of the first stage 6 is connected to pipeline 14, located below upper edge 3 of central pipeline 2 for contact gas injection, and with pipe 15 for circulating water injection to irrigate the first stage of contact 6, and pipe 16 of the second stage 7 is additionally equipped with heat exchanger-cooler 17 of the circulating water and connected to pipe 18 located above the dead plate 5 below upper edge 9 of cup 8, and with the pipe 20 for circulating water injection to irrigate the second stage of contact 7 through distributor 22, which also contains liquid trap 23 installed in the upper bottom of housing 1, connected to pipeline 58 for withdrawing contact gas from the scrubber, in which the first stage of contact 6 contains three ring-shaped, located horizontally and sequentially along the contact gas flow perforated or grid trays — gas-distribution tray 24 and two working trays 25, 26 for contacting contact gas and circulating water — with the ratio of clear opening of the trays, respectively 1:(0.3–0.7):(0.15–0.5), each of working trays 25, 26 is a non-turbo grid tray for water and has a circulating water distribution device containing an annular receiving pocket 27, 28 located in the peripheral part of the tray with an overflow threshold in the form of an annular vertical overflow partition 29, 30, the upper edge 35, 36 of which is located in a horizontal plane, for receiving circulating water and distributing it over the web of the tray, as well as distribution boxes 31, 32 of cylindrical shape located in the central part of the trays, the upper edges of which are in the horizontal plane and are located below or at the level of the upper edges 35, 36 of the annular overflow partitions 29, 30, forming overflow thresholds, moreover, distribution boxes 31, 32 have overflow pipes 37, 38, the lower edges 39, 40 of which are located below the upper edge 3 of pipeline 2 for contact gas injection under the level of the water layer in the bottom part of the scrubber, the circulation pipeline of the first contacting stage 6 is connected to pipe 15 located in receiving pocket 27 of lower working tray 25, and the scrubber has one or more overflow pipes 44, 45 located outside or inside scrubber housing 1, moreover, upper ends 46, 47 of these pipes are located below upper edge 9 of cup 8 of dead tray 5, and the lower ends — in receiving pocket 28 of upper working tray 26 or above it. At the same time, upper end 47 of overflow pipe 45, located inside scrubber housing 1, is equipped with a cap, which creates water seal 56 when the excess water overflows from the second stage of contact 7.

EFFECT: technical result is to increase the efficiency of heat and mass transfer in a disc-shaped scrubber, to ensure an increase in the degree of cleaning of contact gas from catalyst dust, a decrease in the temperature of contact gas at the outlet of the scrubber and obtaining pure hot water suitable for use as a coolant in surface heat exchangers, in relation to the requirements of the implementation processes for the production of olefinic hydrocarbons by dehydrogenating the corresponding paraffinic hydrocarbons.

13 cl, 1 dwg, 3 tbl, 2 ex