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    Sodium chloride brine purificn. in electrolysis plant - by discharging part of brine to maintain constant sulphate level and sodium bi:sulphate prodn.
    6.
    发明专利
    Sodium chloride brine purificn. in electrolysis plant - by discharging part of brine to maintain constant sulphate level and sodium bi:sulphate prodn. 未知

    公开(公告)号：DE3037818A1

    公开(公告)日：1982-04-15

    申请号：DE3037818

    申请日：1980-10-07

    Applicant: HOECHST AG

    Inventor： BENNINGER SIEGFRIED DIPL CHEM

    IPC: C01D3/16 ,  C01D5/02 ,  C25B15/08 ,  C25B1/42 ,  C25B1/46

    Abstract: In the purificn. of NaCl brine for electrolysis in amalgam or membrane cells, which is produced by saturating dil. brine with rock salt and contains sulphate, Ca and Mg, the Ca and opt. Mg is pptd. with alkali hydroxide and carbonate, the novel feature is that pt. of the dil. or purified re-conc. brine is discharged (dis)continuously and replaced by an equal vol. of brine contg. little or no sulphate or water, so that the sulphate ions in the circulating brine do not exceed a stationary concn. of 25 g/l (as Na2SO4). The prodn. of NaHSO4 is also claimed, in which the mixt. of NaCl and Na2SO4 obtd. by evapn. of the discharged brine is reacted with an equimolar amt. of H2SO4 at elevated temp. The discharged brine is pref. conc. by evapn., after removal of Hg and filtration if necessary. Evapn. takes place in 2 stages, the first until NaCl contg. sulphate starts to separate and the second.

    7.
    发明专利
    未知

    公开(公告)号：DE3008563A1

    公开(公告)日：1981-09-17

    申请号：DE3008563

    申请日：1980-03-06

    Applicant: HOECHST AG

    Inventor： BENNINGER SIEGFRIED DIPL CHEM ,  REINING KARL DIPL ING ,  KRASEL WERNER

    IPC: B01F1/00 ,  C01D3/08 ,  C01D3/04 ,  C25B1/16 ,  C25B1/24

    Abstract: The invention relates to an open dissolving chamber for rock salt and to an apparatus for the production, free from vapors, of concentrated, aqueous sodium chloride crude brine by continuously dissolving rock salt in this dissolving chamber. The dissolving chamber contains a heap of rock salt with which the brine which is unsaturated in respect of salt comes into contact. The brine thereby becomes saturated with sodium chloride and then passes out of the dissolving chamber. In the present apparatus, the unsaturated brine enters at the base of the dissolving chamber. The saturated crude brine is removed from the rock salt through at least one vertical or inclined screen which largely holds back suspended rock salt particles. The liquid level of the saturated crude brine in the dissolving chamber should not reach the surface of the heap of rock salt, and the side of the screen facing the interior of the dissolving chamber should be completely covered with a mixture of saturated crude brine and rock salt.

    9.
    发明专利
    未知

    公开(公告)号：DE2302132A1

    公开(公告)日：1974-08-22

    申请号：DE2302132

    申请日：1973-01-17

    Applicant: HOECHST AG

    Inventor： BENNINGER SIEGFRIED DIPL CHEM

    IPC: C07C17/00 ,  C07C17/013 ,  C07C17/087 ,  C07C19/08 ,  C07C67/00 ,  C25B3/28 ,  C10M3/24

    Abstract: 1452212 Branched perfluoroalkanes HOECHST AG 15 Jan 1974 [17 Jan 1973] 01849/74 Heading C2C [Also in Division C7] Branched perfluoroalkanes are produced by electrolysis of a branched perfluoroolefin in the presence of anhydrous HF at 0-20‹ C. in the absence of a conductive salt. Suitable olefins have 4-14 C atoms and an isomeric mixture of perfluoroolefins having the same number of C atoms may be electrolysed. Oligomers of C 2 F 4 or C 3 F 6 may be used in the process. Amongst the examples the products (CF 3 ) 2 CF(CF 2 ) 2 CF 3 , (CF 3 ) 2 CFCF(C 2 F 5 ) 2 , [(CF 3 ) 2 CF] 2 CFC 2 F 5 , C 2 F 5 CF(CF 3 )CF(CF 3 )C 2 F 5 and C 2 F 5 CF(CF 3 )C 2 F 5 are obtained.

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