Methods for controlling the growth of microorganisms and / or biofilms in industrial processes

The present invention relates to a method of controlling a biofilm， removing a formed biofilm， and / or controlling microorganisms， preferably bacterial growth， in an aqueous environment of an industrial manufacturing process comprising a cellulosic fiber material. The compound according to formula (I) is introduced into the aqueous environment of this method， wherein in formula (I)， R1， R2 and R3 are each independently a hydrogen atom; Halogen atom; Hydroxy group; Amino group; Alkylamino groups having 1 to 4 carbon atoms， alkyl groups， hydroxyalkyl groups， haloalkyl groups or alkoxy groups; Or an acylamino group having 1 to 10 carbon atoms; A is 2-thiazoleamine; 2-propennitrile; 2-propenoic acid; Alkyl esters or hydroxyalkyl esters of 2-propenoic acid having 1 to 4 carbon atoms; Or -CHCHCONR5R6 group， wherein R5 and R6 independently represent a hydrogen atom， alkyl or hydroxyalkyl having 1 to 4 carbon atoms， provided that the compound according to formula I is 3-[(4-methylphenyl) -Sulfonyl] -2-propennitrile or 4-amino-N-2-thiazolyl-benzenesulfonamide. The invention relates to a method for controlling of a biofilm， for removing of a formed biofilm and/or for controlling a growth of microorganisms， preferably bacteria， in an aqueous environment of an industrial manufacturing processcomprising cellulosic fibre material. A compound according to Formula I is administered to the aqueous environment of the process， in which Formula I R1， R2 and R3 independently represent a hydrogen atom; halogen atom; hydroxy group; amino group; alkylamino group， alkyl group， hydroxyalkyl group， haloalkyl group or alkoxy group having 1 to 4 carbon atoms; or an acylamido group having 1 to 10 carbon atoms; and A represents 2-thiazolamine; 2-propenenitrile; 2-propenoic acid; alkyl ester or hydroxyalkyl ester of 2-propenoic acid having 1 to 4 carbon atoms; or -CHCHCONR5R6 group， where R5 and R6 represent independently hydrogen atom， alkyl or hydroxyalkyl having 1 to 4 carbon atoms， with the proviso that the compound according to Formula I is not 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile or 4-amino-N-2-thiazolyl-benzene-sulphonamide. The invention relates to a method for controlling of a biofilm， for removing of a formed biofilm and/or for controlling a growth of microorganisms， preferably bacteria， in an aqueous environment of an industrial manufacturing processcomprising cellulosic fibre material. A compound according to Formula I is administered to the aqueous environment of the process， in which Formula I R1， R2 and R3 independently represent a hydrogen atom; halogen atom; hydroxy group; amino group; alkylamino group， alkyl group， hydroxyalkyl group， haloalkyl group or alkoxy group having 1 to 4 carbon atoms; or an acylamido group having 1 to 10 carbon atoms; and A represents 2-thiazolamine; 2-propenenitrile; 2-propenoic acid; alkyl ester or hydroxyalkyl ester of 2-propenoic acid having 1 to 4 carbon atoms; or -CHCHCONR5R6 group， where R5 and R6 represent independently hydrogen atom， alkyl or hydroxyalkyl having 1 to 4 carbon atoms， with the proviso that the compound according to Formula I is not 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile or 4-amino-N-2-thiazolyl-benzene-sulphonamide.