1. A process for installing an analytical instrument in an existing pipeline, for investigating a fluid flowing in said existing pipeline, said pipeline comprising at least two pipe segments joined together by a first of said first pipe segment and a second connecting flange of said second pipe segment, said process comprising arranging a connecting flange for analytical instruments between said first and second pipe segments which are located onsite, said connecting flange having a disk-shaped installation ring which comprises two substantially planar end surfaces, an outer jacket surface and an inner jacket surface which defines an axial passage, the installation ring having at least one radial drillhole opening into the outer jacket surface, to which an analytical instrument is connectable, wherein the axial length of the installation ring is less than 15 mm.
2. The process of claim 1, wherein the diameter of the axial passage of the installation ring corresponds substantially to the internal diameter of the pipeline.
3. The process of claim 1, wherein the installation ring has an external diameter which is smaller than the external diameter of the two connecting flanges of the adjacent pipeline segments between which the installation ring can be installed.
4. The process of claim 1, wherein the radial drillhole merges into a connecting pipe at the outer jacket surface of the installation ring.
5. The process of claim 4, wherein the analytical instrument can be connected to the connecting pipe.
6. The process of claim 1, wherein the radial drillhole opens into the inner jacket surface of the installation ring.
7. The process of claim 1, which comprises forming the radial drillhole so as to open into a projection which starts from the inner jacket surface of the installation ring and projects into the axial passage.
8. The process of claim 1, further comprising connecting an analytical instrument to said connecting flange.
9. In the process of claim 9, in which the analytical instrument is a pressure meter or a temperature meter.
10. The process of claim 1, which comprises arranging the connecting flange in said pipeline as part of a plant for preparing alkyl (meth)acrylates by reacting a (meth)acrylic acid with alkanols.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. (p-Aminohydroxyphenyl)acrylamide derivatives of general formula (I) or the physiologically tolerated, water-soluble salts thereof
9
wherein
R1 denotes hydrogen, a halogen atom, a C1-C4-alkyl group, a C1-C4-hydroxyalkyl group or a C1-C4-alkoxy group;
R2 and R3 independently of each other denote hydrogen or a C1-C6-alkyl group;
R4 and R5 independently of each other denote hydrogen, a C1-C2-alkoxy group, a C1-C6-alkyl group, an unsaturated C3-C6-alkyl group, a C2-C4-hydroxyalkyl group, a C3-C4-dihydroxyalkyl group, a C2-C4-aminoalkyl group, a C2-C4-dimethylaminoalkyl group, a C2-C4-acetylaminoalkyl group, a C2-C4-methoxyalkyl group, C2-C4-ethoxyalkyl group, a C1-C4-cyanoalkyl group, a C1-C4-carboxyalkyl group, a C1-C4-aminocarbonylalkyl group, a pyridylmethyl group, a furfuryl group, a thienylmethyl group, a hydrogenated furfuryl group a substituted pyridyl group, a group of formula (II)
10
a group of formula (III)
11
or a group of formula (IV)
12
or R4 and R5 together with the nitrogen atom form a ring of the following formula
13
R6 denotes hydrogen, a carboxy group or an aminocarbonyl group;
R7 and R8 independently of each other denote hydrogen, a hydroxyl group, an aminocarbonyl group, a methylthiomethyl group, a phenyl-substituted or hydroxyl-substituted phenyl group or a group of formula
14
R9, R10, R11, R12 and R13 independently of each other denote hydrogen, a halogen atom, a cyano group, a hydroxyl group, a C1-C4-alkoxy group, a C1-C4-hydroxyalkoxy group, a C1-C6-alkyl group, a C1-C4-alkyl thioether group, a mercapto group, a nitro group, an amino group, an alkylamino group, a C1-C4-hydroxyalkylamino group, a dialkylamino group, a di(C1-C4-hydroxyalkyl)amino group, a (C3-C4-dihydroxyalkyl)amino group, a (C1-C4-hydroxyalkyl)-C1-C4-alkylamino group, a trifluoromethyl group, a C(O)H group, a C(O)CH3 group, a C(O)CF3 group, an Si(CH3)3 group, a C1-C4-hydroxyalkyl group or a C3-C4 dihydroxyalkyl group, or two adjacent R9 to R13 groups form an OCH2O bridge;
R14 denotes a C1-C4-alkyl group, a benzyl group or a C2-C4-hydroxyalkyl group;
R15 denotes hydrogen or a C1-C6-alkyl group;
R16 denotes hydrogen, a hydroxyl group, a carboxy group, an aminocarbonyl group or a hydroxymethyl group; and
R17 denotes hydrogen or a C1-C6-alkyl group.
2. p-Aminophenol derivative according to claim 1, characterized in that in formula (I) one, several or all R1, R2 and R3 groups denote hydrogen.
3. p-Aminophenol derivative according to claim 1 or 2, characterized in that in formula (I) R4 denotes a C1-C2-alkyl group, a methoxy group or a C2-C4-hydroxyalkyl group and R5 denotes a C2-C4-hydroxyalkyl group.
4. p-Aminophenol derivative according to claim 1 or 2, characterized in that in formula (I) R4 and R5 independently of each other denote hydrogen, a C1-C4-alkyl group, an unsaturated C1-C6-alkyl group, a C2-C4-hydroxyalkyl group, a C3-C4-dihydroxyalkyl group, a furfuryl group, a substituted phenyl group of formula (III) or a substituted pyrazolyl group of formula (IV).
5. p-Aminophenol derivative according to claim 1, 2 or 4, characterized in that in formula (I) R4 denotes hydrogen and R5 denotes a C1-C4-alkyl group, an unsaturated C3-C6-alkyl group, a C2-C4-hydroxyalkyl group, a C3-C4-dihydroxyalkyl group, a furfuryl group, a substituted phenyl group of formula (III) or a substituted pyrazolyl group of formula (IV).
6. p-Aminophenol derivative according to one of claims 1 to 5, characterized in that it is selected from the group consisting of 3-(5-amino-2-hydroxyphenyl)-N-ethylacrylamide, 3-(2-amino-5-hydroxyphenyl)-N-ethylacrylamide, 3-(5-amino-2-hydroxyphenyl)-N-(4-hydroxyphenyl)acrylamide, 3-(2-amino-5-hydroxyphenyl)-N-(4-hydroxyphenyl)acrylamide, 3-(5-amino-2-hydroxyphenyl)-N-(4-aminophenyl)acrylamide, 3-(2-amino-5-hydroxyphenyl)-N-(4-aminophenyl)acrylamide, N-4-amino-2-(2-hydroxyethyl)-2H-pyrazol-3-yl-3-(5-amino-2-hydroxyphenyl)acrylamide and N-4-amino-2-(2-hydroxyethyl)-2H-pyrazol-3-yl-3-(2-amino-5-hydroxyphenyl)acrylamide and the physiologically tolerated salts thereof.
7. Agent for oxidative dyeing of keratin fibers based on a developer-coupler combination, characterized in that it contains as developer at least one p-aminophenol derivative of formula (I) according to one of claims 1 to 6.
8. Agent according to claim 7, characterized in that it contains the p-aminophenol derivative of formula (I) in an amount from 0.005 to 20 wt. %.
9. Agent according to claim 7 or 8, characterized in that the coupler is selected from the group consisting of N-(3-dimethylaminophenyl)urea, 2,6-diaminopyridine, 2-amino-4-(2-hydroxyethyl)aminoanisole, 2,4-diamino-1-fluoro-5-methylbenzene, 2,4-diamino-1-methoxy-5-methylbenzene, 2,4-diamino-1-ethoxy-5-methylbenzene, 2,4-diamino-1-(2-hydroxyethoxy)-5-methylbenzene, 2,4-di(2-hydroxyethyl)amino-1,5-dimethoxybenzene, 2,3-diamino-6-methoxypyridine, 3-amino-6-methoxy-2-(methylamino)pyridine, 2,6-diamino-3,5-dimethoxypyridine, 3,5-diamino-2,6-dimethoxypyridine, 1,3-diaminobenzene, 2,4-diamino-1-(2-hydroxyethoxy)benzene, 1,3-diamino-4-(2,3-dihydroxypropoxy)benzene, 1,3-diamino-4-(3-hydroxypropoxy)benzene, (1,3-diamino-4-(2-methoxyethoxy)benzene, 2,4-diamino-1,5-di(2-hydroxyethoxy)benzene, 1-(2-aminoethoxy)-2,4-diaminobenzene, 2-amino-1-(2-hydroxyethoxy)-4-methylaminobenzene, 2,4-diaminophenoxyacetic acid, 3-di(2-hydroxyethyl)aminoaniline, 4-amino-2-di(2-hydroxyethyl)amino-1-ethoxybenzene, 5-methyl-2-(1-methylethyl)phenol, 3-(2-hydroxyethyl)aminoaniline,-3-(2-aminoethyl)aminoaniline, 1,3-di(2,4-diaminophenoxy)propane, di(2,4-diaminophenoxy)methane, 1,3-diamino-2,4-dimethoxybenzene, 2,6-bis(2-hydroxyethyl)aminotoluene, 4-hydroxyindole, 3-dimethylaminophenol, 3-diethylaminophenol, 5-amino-2-methylphenol, 5-amino-4-fluoro-2-methylphenol, 5-amino-4-methoxy-2-methylphenol, 5-amino-4-ethoxy-2-methylphenol, 3-amino-2,4-dichlorophenol, 5-amino-2,4-dichlorophenol, 3-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 3-aminophenol, 2-(3-hydroxyphenyl)aminoacetamide, 5-(2-hydroxyethyl)amino-4-methoxy-2-methylphenol, 5-(2-hydroxyethyl)amino-2-methylphenol, 3-(2-hydroxyethyl)aminophenol, 3-(2-methoxyethyl)aminophenol, 5-amino-2-ethylphenol, 5-amino-2-methoxyphenol, 2-(4-amino-2-hydroxyphenoxy)ethanol, 5-(3-hydroxypropyl)amino-2-methylphenol, 3-(2,3-dihydroxypropyl)amino-2-methylphenol, 3-(2-hydroxyethyl)amino-2-methyl-phenol, 2-amino-3-hydroxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 5-amino-4-chloro-2-methylphenol, 1-naphthol, 2-methyl-1-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 2-methyl-1-naphthol acetate, 1,3-dihydroxybenzene, 1-chloro-2,4-dihydroxybenzene, 2-chloro-1,3-dihydroxybenzene, 1,2-dichloro-3,5-dihydroxy-4-methylbenzene, 1,5-dichloro-2,4-dihydroxybenzene, 1,3-dihydroxy-2-methylbenzene, 3,4-methylenedioxyphenol, 3,4-methylenedioxyaniline, 5-(2-hydroxyethyl)amino-1,3-benzodioxole, 6-bromo-1-hydroxy-3,4-methylenedioxybenzene, 3,4-diaminobenzoic acid, 3,4-dihydro-6-hydroxy-1,4(2H)benzoxazine, 6-amino-3,4-dihydro-1,42Hbenzoxazine, 3-methyl-1-phenyl-5-pyrazolone, 5,6-dihydroxyindole, 5,6-dihydroxyindoline, 5-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole and 2,3-indolinedione.
10. Agent according to one of claims 7 to 9, characterized in that in addition to the compounds of formula (I) it contains other known compounds selected from the group consisting of 1,4-diaminobenzene, 1,4-diamino-2-methylbenzene, 1,4-diamino-2,6-dimethylbenzene, 1,4-diamino-3,5-diethylbenzene, 1,4-diamino-2,5-dimethylbenzene, 1,4-diamino-2,3-dimethylbenzene, 2-chloro-1,4-diaminobenzene. 1,4-diamino-2-(thiophen-2-yl)benzene, 1,4-diamino-2-(thiophen-3-yl)benzene, 1,4-diamino-2-(pyridin-3-yl)benzene, 2,5-diaminobiphenyl, 1,4-diamino-2-methoxymethylbenzene, 1,4-diamino-2-aminomethylbenzene, 1,4-diamino-2-hydroxymethylbenzene, 1,4-diamino-2-(2-hydroxyethoxy)benzene, 2-2-(acetylamino)ethoxy-1,4-diaminobenzene, 4-phenylaminoaniline,4-dimethylaminoaniline, 4-diethylaminoaniline,4-dipropylaminoaniline, 4-ethyl(2-hydroxyethyl)aminoaniline,4-di(2-hydroxyethyl)aminoaniline, 4-di(2-hydroxyethyl)amino-2-methylaniline, 4-(2-methoxyethyl)aminoaniline, 4-(3-hydroxypropyl)aminoaniline, 4-(2,3-dihydroxypropyl)aminoaniline, 1,4-diamino-2-(1-hydroxyethyl)benzene, 1,4-diamino-2-(2-hydroxyethyl)benzene, 1,4-diamino-2-(1-methylethyl)benzene, 1,3-bis-(4-aminophenyl)(2-hydroxyethyl)amino-2-propanol, 1,4-bis(4-aminophenyl)aminobutane, 1,8-bis-(2,5-diaminophenoxy)-3,6-dioxaoctane,4-aminophenol, 4-amino-3-methylphenol, 4-amino-3-(hydroxymethyl)phenol, 4-amino-3-fluorophenol, 4-methylaminophenol, 4-amino-2-(aminomethyl)phenol, 4-amino-2-(hydroxymethyl)phenol, 4-amino-2-fluorophenol, 4-amino-2-(2-hydroxyethyl)aminomethylphenol, 4-amino-2-methylphenol, 4-amino-2-(methoxymethyl)phenol, 4-amino-2-(2-hydroxyethyl)phenol, 5-aminosalicylic acid, 2,5-diaminopyridine, 2,4,5,6-tetraaminopyrimidine, 2,5,6-triamino-4-(1H)-pyrimidone, 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole, 4,5-diamino-1-(1-methylethyl)-1H-pyrazole, 4,5-diamino-1-(4-methyl-phenyl)methyl-1H-pyrazole, 1-(4-chlorophenyl)methyl-4,5-diamino-1 H-pyrazole, 4,5-diamino-1-methyl-1H-pyrazole, 2-aminophenol, 2-amino-6-methylphenol, 2-amino-5-methylphenol and 1,2,4-trihydroxybenzene.
11. Agent according to one of claims 7 to 10, characterized in that it contains each of the developers and couplers in an amount from 0.005 to 20 wt. %, based on the total amount of the coloring agent.
12. Agent according to one of claims 7 to 11, characterized in that it contains additionally at least one direct dye.
13. Agent according to one of claims 7 to 12, characterized in that it is a hair colorant.