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    Method of automatically controlling the roasting of materials containing roastable sulphur
    5.
    发明专利
    Method of automatically controlling the roasting of materials containing roastable sulphur 未知

    公开(公告)号：GB886786A

    公开(公告)日：1962-01-10

    申请号：GB2043460

    申请日：1960-06-10

    Applicant: BASF AG

    Inventor： WITTMANN GEORG ,  HENGST KONRAD ,  STUMPFI HANS

    IPC: C01B17/52 ,  C22B1/10

    Abstract: In the roasting of materials containing roastable sulphur in two fluidized layers with a separate supply of an oxygen-containing gas to each layer, the amount of oxygen-containing gas supplied to the first (pre-roasting) layer is automatically controlled by a regulator situated in the second (after-roasting) layer so that a rise in temperature in the second layer reduces the supply of oxygen-containing gas and vice versa, and the supply of raw material to the first layer is automatically controlled by a regulator situated in the first layer so that when the temperature in the first layer rises above a certain level more raw material is supplied, and vice versa, thereby tending to keep the temperature constant. The oxygen-containing gas supply to the second layer is preferably so controlled by a regulator that the supply remains constant regardless of the height of the layer. The heights of the individual layers may be controlled independently of the supply of material thereto, by means of pressure or differential pressure regulators which control the solids discharge means from the layers. Preferably the supply of oxygen-containing gas to the first layer is controlled by a regulator which is varied within fixed limits about a hand-set mean value by the temperature sensitive device in the second layer. In the figure, raw material from hopper 1 is fed into the first fluidised (preroasting) layer 4 by means of a plate feeder 2, the rate of feed being controlled by a temperature sensitive device 11. The supply of oxygen-containing gas to the first layer is controlled by temperature sensitive device 14, which is situated in the second fluidised (after-roasting) layer 7. Pressure regulator 12 controls the rate of discharge of solids from layer 4 to layer 7, and pressure regulator 15 controls the discharge of solids from layer 7. The regulator 16 maintains a constant rate of supply of oxygen-containing gas to layer 7. Any dust leaving cyclone 6 is burnt in a combustion zone 9, the supply of oxygen-containing gas to this zone being controlled by temperature regulator 17 in such a way that the temperature reaches a maximum.

    Regulating the concentration of hydrochloric acid obtained by the process of adiabatic hydrogen chloride absorption
    7.
    发明专利
    Regulating the concentration of hydrochloric acid obtained by the process of adiabatic hydrogen chloride absorption 未知

    公开(公告)号：GB1032806A

    公开(公告)日：1966-06-15

    申请号：GB1451063

    申请日：1963-04-11

    Applicant: BASF AG

    Inventor： KUNZER WERNER ,  HENGST KONRAD ,  DIEBEL HANS ,  LEUTERT FRITZ

    IPC: C01B7/00 ,  C01B7/01

    Abstract: In the manufacture of hydrochloric acid by the adiabatic absorption in water of a fluctuating supply of impure hydrogen chloride, the concentration of the effluent acid is maintained constant by controlling the water supply in response to said concentration whereby the temperature of the adsorption zone is sufficiently high to entrain impurities in the steam produced. Should the hydrogen chloride concentration decrease, the water supply is increased to form a dilute acid which is withdrawn, stored and fed instead of water in an ensuing period of high hydrogen chloride concentration in the feed gas. The working temperature is preferably 80-100 DEG C. As shown in Fig. 1, hydrogen chloride containing gas passes through pipe 1 into absorption packing 3. When the amount of hydrogen chloride gas is insufficient for the working temperature to be reached, absorption water is supplied through pipe 4, controlled by valve 26, from tank 14. The water level in tank 14 is kept constant. The hydrochloric acid formed passes through into pipe 7, where its electrical conductivity is measured by 8, overflows at 9, passes through gas seal 10, cooler 11, by-passing closed valve 23 and is stored in container 13. When the rate of supply of hydrogen chloride gas is high enough for sufficient heat to be generated by absorption for enough water to evaporate to create a temperature of 80-100 DEG C. at temperature sensing device 16, temperature regulator 27 firstly switches on concentration regulator 29 which now controls the amount of absorption liquid supplied to the absorption tower, secondly opens valve 23 so that pure acid flows into a reservoir (not shown), and thirdly causes contaminated hydrochloric acid to be pumped from tank 13 into tank 14 after a selected lapse of time, which closes valve 25 to stop the flow of water. The level in the tank is controlled by overflow 20. The contaminated hydrochloric acid is now supplied to the absorption tower, and when tank 14 is empty, valve 25 opens and water is again fed in. If the supply rate of hydrogen chloride falls below a certain minimum determined by the flow of water and the size of the column, flow regulator 32 restores the control of the flow of water to remote control 21 and closes valve 23, whereby contaminated acid is again collected in container 13.

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