METHOD FOR PREPARATION OF SULPHUR TRIOXIDE AND DEVICE THEREOF

FIELD: chemistry. ^ SUBSTANCE: initial reaction gas mixture containing sulphur dioxide and oxygen passes through at least two arranged in-line catalyst layer with alternately changing in cyclic mode the direction of the reaction gas mixture inlet and outlet to/from every layer. The feed of reaction gas mixture to one of the catalyst layers is increased up to maximal value with following feed decrease up to complete cease in the moment of the gas movement direction change in the layer; the feed of reaction gas mixture is simultaneously decreased in the same cycle up to complete cease, then direction of gas movement is changed and cycle is repeated. The total flow of reaction gas mixture fed and withdrawn to/from corresponding catalyst layers is maintained constant due to time displacement of the moment of the gas movement direction change in every layer. Method is implemented in contact apparatus containing body 1 with connections 12 and 13 for reaction gas mixture inlet and outlet, central column 5 coaxially positioned in the body and connected with connections as well as at least two gridworks 3 with catalyst located between body and column throughout the height. The vertical power shaft 9 is coaxially located in the cavity of the central column 5 and provided with control valves 6 fixed on the shaft The amount of the control valves 6 is equal to amount of the gridworks with catalyst separated with separating partition-wall 11. Every valve is designed as hollow cylinder with windows 10 connected with connections for reaction gas mixture inlet and outlet and provided with inclined inner partition-wall 8 separating the valve cavity In two neighbour valves the windows and inclined partition-walls are turned about on the shaft relative to each other at angle 90. ^ EFFECT: quality enhancing of the obtained sulphur trioxide. ^ 2 cl, 3 dwg Изобретение относится к химической промышленности и может быть использовано для окисления диоксида серы до триоксида в сернокислотном производстве. Исходную реакционную газовую смесь, содержащую диоксид серы и кислород, пропускают через, по меньшей мере, два последовательно расположенных слоя катализатора при попеременном изменении направления подачи и отвода реакционной газовой смеси на каждый слой в циклическом режиме. При этом на один из слоев катализатора подачу реакционной газовой смеси увеличивают до максимального значения с последующим уменьшением ее подачи до полного прекращения в момент изменения направления движения