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    Method of calcining sodium bicarbonate
    2.
    发明专利
    Method of calcining sodium bicarbonate 未知

    公开(公告)号：GB943788A

    公开(公告)日：1963-12-04

    申请号：GB4243561

    申请日：1961-11-28

    Applicant: BASF AG

    Inventor： HANSEN GUENTER ,  MUELLER HANS ,  SCHMITT KARL OTTO ,  VOGEL KARL

    IPC: C01D7/12

    Abstract: Sodium bicarbonate, which may be moist, is kept in suspension in a finely divided condition in a current of hot gas, and calcined, after drying if necessary, and is then separated from the gas; the solid is treated in at least two systems connected in series, in each of which the solid is suspended in the gas by use of e.g. a flash dryer or fluidized bed furnace, and separated in, e.g., a cyclone or baffle chamber. In system I, gas at a temperature of about 300 DEG C. from separation cyclone 6 of system II, and the solid to be heated, separately enter the cylindrical flash dryer 3 of system I; here the solid becomes suspended in the gas and a spiral motion is imparted by guide plates. The solid is then separated in cyclone 4 from the gas, now at a temperature of about 100 DEG C., which leaves by blower 7 which maintains the requisite gas velocity. The solid then enters cylindrical flash dryer 5 of system II where it meets gas at a temperature of about 550 DEG C. The suspension proceeds to cyclone 6 where gas and solid are separated and the finished solid product is discharged through gate 8. The off-gas that leaves cyclone 4 may be used in yet another stage similar to systems I and II. The degree of heat utilization reaches a value of nearly 70%. In this process, formation of dust is cut down, and the product does not differ from the soda calcined in a rotary kiln. The iron apparatus used shows no product deposits even after operation for several weeks. No smell of ammonia is perceptible when the salt is dissolved in water.

    Production of sodium bicarbonate
    4.
    发明专利
    Production of sodium bicarbonate 未知

    公开(公告)号：GB1064558A

    公开(公告)日：1967-04-05

    申请号：GB1000966

    申请日：1966-03-08

    Applicant: BASF AG

    Inventor： SCHMITT KARL OTTO ,  HANSEN GUENTER ,  MUELLER HANS

    IPC: C01D7/08 ,  C01D7/18

    Abstract: A process for the production of NaHCO3 and NH4Cl by reaction of NH3 and CO2 in a mother liquor containing NaCl comprises adding all the required NH3 to the liquor but only sufficient CO2 to saturate the liquor, at not more than 60 DEG C., with NaHCO3; introducing the liquor to a second stage at not more than 35 DEG C. and adding the rest of the CO2, precipitating and separating the NaHCO3 without cooling, dissolving fresh NaCl in the liquor, cooling to precipitate NH4Cl, separating and recycling the liquor to the first stage. The process of the invention reduces encrustation of NaHCO3 on the apparatus.

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