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    METHOD FOR FLOTATION OF A SILICATE-CONTAINING IRON ORE WITH A CATIONIC COLLECTOR
    11.
    发明申请
    METHOD FOR FLOTATION OF A SILICATE-CONTAINING IRON ORE WITH A CATIONIC COLLECTOR 有权

    公开(公告)号：US20220212204A1

    公开(公告)日：2022-07-07

    申请号：US17606997

    申请日：2020-04-27

    Applicant: BASF SE

    Inventor： Alexej Michailovski ,  Alexander Panchenko ,  Hannes Ferdinand Zipfel ,  Martin Ernst ,  Gabriela Budemberg ,  Stefanov Nedko Drebov ,  Sylvia von Krog ,  Tamara Kuelzer ,  Long Phan

    IPC: B03D1/01 ,  C07C215/18

    Abstract: The invention relates to a method for manufacturing a concentrate enriched in iron mineral content from an ore, which contains an iron mineral and silicate, by reverse flotation, which method comprises the step of (c) adding a compound of formula I wherein R1 is C9-C22 alkyl or alkenyl, which is linear or branched, R2 is H, C1-C4 alkyl, which is linear or branched, R3 is —X—NH2, H or C1-C4 alkyl, which is linear or branched, and X is C2-C4 alkylene, which is linear or branched, or a salt of a protonated compound of formula I and an anion, to a prepared aqueous pulp of the ore and optionally one or more flotation auxiliaries to obtain an aqueous mixture. Furthermore, a method for manufacturing a specific group of compounds of formula I, i.e. compounds of formula 1-X wherein R1 is C9-C15 alkyl, which is linear or branched, R2 is H, R3 is —X—NH2 and X is C2-C4 alkylene, which is linear or branched, is disclosed.

    Process for removal of acid gases from a fluid stream with a liquid absorbent comprising a piperazine ring
    14.
    发明授权
    Process for removal of acid gases from a fluid stream with a liquid absorbent comprising a piperazine ring 有权

    公开(公告)号：US12138583B2

    公开(公告)日：2024-11-12

    申请号：US17431872

    申请日：2020-02-14

    Applicant: BASF SE

    Inventor： Martin Ernst ,  Thomas Ingram ,  Gerald Vorberg ,  Georg Sieder

    IPC: B01D53/14 ,  C07D295/13 ,  C10L3/10

    Abstract: A process for removal of acid gases from fluid stream, wherein the fluid stream is brought into contact with an absorbent to obtain a treated fluid stream and a laden absorbent, the absorbent comprising a diluent and a compound of the general formula (I) wherein R1 is selected from C1-C8-alkyl and C2-C8-hydroxyalkyl; R2 is selected from hydrogen and C1-C8-alkyl; R3 is selected from hydrogen and C1-C8-alkyl; R4 is selected from hydrogen and C1-C8-alkyl; R5 is C1-C8-alkyl; with the proviso that at least one of the following conditions (i) and (ii) is met: (i) R5 is C3-C8-alkyl bound to the nitrogen atom via a secondary or tertiary carbon atom; (ii) when R4 is hydrogen, R3 is C1-C8-alkyl; or when R4 is C1-C8-alkyl, at least one of R2 and R3 is C1-C8-alkyl; and n is an integer from 0 to 6. Further provided is an absorbent for the absorption of acid gases from a fluid stream, comprising a diluent and a compound of the general formula (I) as defined above, as well as the use of a compound of the general formula (I) as defined above for removal of acid gases from a fluid stream. The absorbents are useful for the selective removal of hydrogen sulfide from fluid streams and have high acid gas loading capacity, high stability, and low volatility.

    Method for Producing Acrylic Acid Polymers
    16.
    发明申请
    Method for Producing Acrylic Acid Polymers 审中-公开

    公开(公告)号：US20200299426A1

    公开(公告)日：2020-09-24

    申请号：US16074100

    申请日：2017-02-02

    Applicant: BASF SE

    Inventor： Johannes Barth ,  Gledison Fonseca ,  Dieter Faul ,  Martin Ernst ,  Juergen Detering ,  Ferdinand Leifeld ,  Gazi Tuerkoglu

    IPC: C08F120/06 ,  C11D3/37 ,  C11D3/00

    Abstract: A process for producing aqueous solutions of acrylic acid polymers by polymerization of acrylic acid in feed operation with a free-radical starter in the presence of hypophosphite in water as solvent, which comprises (i) initially charging water and optionally acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, optionally aqueous hypophosphite solution and optionally initiator, (ii) adding acrylic acid in acidic, unneutralized form, optionally one or more ethylenicaliy unsaturated comonomers, aqueous free-radical starter solution and aqueous hypophosphite solution, (iii) adding a base to the aqueous solution after termination of the acrylic acid feed, wherein the comonomer content does not exceed 30 wt % based on the total monomer content, wherein the acrylic acid, the aqueous free-radical starter solution and the aqueous hypophosphite solution are added such that the molar ratio x of acrylic acid to phosphorus-bound hydrogen [AA]/[P—H] over a time period in which at least 75% of the acrylic acid is converted has a value x which is constant to within ±0.5 and is in the range from 0.8 to 2.

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