摘要:
The invention relates to an improved method for producing D-pantothenic acid and/or salts thereof and to the use thereof as an additive for animal feed.
摘要:
A method for producing alcoxylated carbonyl compounds of general formula (I) (compounds I): R1aR2C(OR3)b wherein R1, R2 represent hydrogen or C¿1?- C6-alkyl, R?3¿ independently means C¿1?- C6-alkyl, a is 0 or 1, b 2 or 3 with the proviso that the sum of a and b is 3, by means of anodic oxidation of germinal dialcoxy compounds of general formula (II) (compounds II) wherein R?4, R5, R6, R7¿ represent hydrogen or C¿1?- C6-alkyl, R?5, R6¿ represent C¿1?- C6-alkyl or C1- C6-alcoxy, in the presence of a C1-C6-alkyl alcohol (compounds III).A usual compound (compound IV) is used as a cathodic depolarizer suitable for electrochemical oxidation. The anodic oxidation and cathodic reduction is carried out in an undivided electrolyte cell in the presence of C1-C6-alkyl alcohols.
摘要:
The invention relates to an improved method for producing D-pantothenic acid and/or salts thereof and to the use thereof as an additive for animal feed.
摘要:
The invention relates to a method for producing a polymer system capable of proton exchange, based on at least one polyaryl ether ketone. Said method consists of: (i) reacting the polyaryl ether ketone(s) with at least one alkane sulphonic acid, to obtain polyaryl ether ketones (I) containing sulphur. The invention also relates to sulphonated polyaryl ether ketones, which can be produced according to the inventive method and to their use as a polymer electrolyte membrane.
摘要:
The invention relates to a method for deionising a cooling medium of a fuel cell (11), said cooling medium circulating in a cooling circuit (20). Said cooling medium is at least intermittently, but preferably continuously, electrochemically deionised. To this end, at least one electrodeionisation cell (23) is arranged in the cooling circuit, a concentrate flow (28) and a diluate flow (27) used as a cooling medium passing through said cell. The concentrate flow (28) can be part of a secondary cooling circuit.
摘要:
The invention relates to a method for the purification of amino acid containing solutions by means of electrodialysis, whereby an amino acid containing solution from the fermentative production of at least one amino acid is used.
摘要:
The invention relates to a method for producing orthocarbonic acid trialkyl esters by electrochemical oxidation of alpha-beta-diketones or alpha-beta-hydroxy ketones in the presence of C1-to C4-alcohols (alcohol A), the keto function being present in the form of a ketal function derived from C1- to C4-alykl alcohols and the hydroxyl function being optionally in the form of an ether function derived from C1- to C4-alykl alcohols (ketal K). The molar ratio of the ketal K to the alcohols A in the electrolytes is 0.2:1 to 10:1.
摘要:
The invention relates to a method for deionising a cooling medium of a fuel cell (11), said cooling medium circulating in a cooling circuit (20). Said cooling medium is at least intermittently, but preferably continuously, electrochemically deionised. To this end, at least one electrodeionisation cell (23) is arranged in the cooling circuit, a concentrate flow (28) and a diluate flow (27) used as a cooling medium passing through said cell. The concentrate flow (28) can be part of a secondary cooling circuit.
摘要:
The invention relates to a method for producing orthoesters of general formula I, in which the radicals are defined as follows: R : hydrogen, C1 to C20 alkyl, C2 to C20 alkenyl, C2 to C20 alkinyl, C3 to C12 cycloalkyl, C4 to C20 cycloalkyl alkyl or C4 to C10 aryl, R2 and R3: C1 to C20 alkyl, C3 to C12 cycloalkyl and C4 to C20 cycloalkyl alkyl, or R and R together form C2 to C10 alkylene, R : C1 to C4 alkyl. According to the invention, a compound of general formula II is electrochemically oxidised in the presence of C1 to C4 alcohols (alcohols A). In said formula, the radicals R to R have the same definition as in the general formula I and R represents a saturated or unsaturated 5 or 6 membered heterocycloalkyl radical or heterocycloaryl radical comprising up to 2 heteroatoms, selected from the group containing N, O and S, said radical being bonded to the residual part of the molecule by a carbon atom, which is in a vicinal position in relation to a heteroatom.