- Production method of K acid
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A production method of a K acid comprises the following steps: 1, mixing 2-naphthol (I) with 92-98% sulfuric acid, introducing a gas, and carrying out a primary sulfonation reaction to obtain a compound (II); 2, reacting the compound (II) with a potassium salt and an ammonium salt, and carrying out an ammonification reaction and sulfuric acid acidifying to obtain a compound (III); and 3, mixing the compound (III) with 95-98% sulfuric acid, introducing a gas, and carrying out a secondary sulfonation reaction to obtain a compound (IV) that is the K acid. The chemical equation of the method is shown in the description. The method effectively increases the utilization rate of sulfuric acid in the sulfonation process, greatly reduces the production amount of waste sulfuric acid and even industrial sulfates, avoids production operating inconvenience brought by use of 20% nicotinic acid and 65% nicotinic acid, improves the operability of the process, and also has the advantages of small sulfuric acid use amount, low production cost, high product quality and small environmental pollution.
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Paragraph 0024; 0028; 0032; 0036
(2017/07/20)
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- Hydroxyethylthio hydroxyethylamino-phenyl-azo and -azoxy dyestuffs
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A process for the preparation of the sulphone of the formula STR1 consists in reductive cleavage of azo/azoxy dyestuffs of the formula STR2 where D is a radical of a diazo component from the benzene or naphthalene series. The invention also relates to the azo/azoxy dyestuffs mentioned.
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- Triphendioxazine dyestuffs
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The novel triphendioxazine dyestuffs of the formula STR1 in which the substituents R, R', T1, T2, X, Y and n have the meanings given in the description are highly suitable for the dyeing and printing of cellulose-containing or amido-containing material.
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- Process for the preparation of [5-amino-2-(2-hydroxyethylamino)phenyl](2-hydroxyethyl) sulphone
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A process for the preparation of the sulphone of the formula: STR1 consists in reductive cleavage of azo/azoxy dyestuffs of the formula STR2 The invention also relates to the azo/azoxy dyestuffs mentioned.
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- Reactive dye having both monochlorotriazinyl and vinylsulfone type reactive groups
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A novel reactive monoazo dye, capable of giving cellulose fiber materials a deep orange to scarlet color and superior in build-up and chlorine fastness properties, represented by a free acid of the formula, STR1 wherein R1 is hydrogen, methyl or ethyl; R2 is an alkyl having 1 to 4 carbons that is either unsubstituted or substituted with hydroxy, cyano, alkoxy, halogen, carboxy, alkoxycarbonyl or sulfonic acid; Z is hydrogen or sulfonic acid; A is phenylene and is either unsubstituted or substituted with 1 or 2 substituents selected from the group consisting of methyl, ethyl, methoxy, ethoxy, chlorine, bromine and sulfonic acid, or natphthylene that is either unsubstituted or substituted with sulfonic acid; X is --SO2 CH=CH2 or --SO2 CH2 CH2 Y in which Y is a group that is splittable by alkalis; and m is an integer of 1 to 3.
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- Fiber reactive monoazo compounds having two vinylsulfone type fiber reactive groups in the molecule
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A monoazo compound of the following formula in a free acid form, STR1 wherein A1 and A2 are phenylene or naphthylene, Z1 and Z2 are --SO2 CH=CH2 or --SO2 CH2 CH2 Y in which Y is a splittable group, R1 and R2 are hydrogen or alkyl, and D is sulfophenyl or sulfonaphthyl, provided that --A1 --Z1 and --A2 --Z2 are different from each other when D is sulfophenyl and both R1 and R2 are hydrogen, which is useful for dyeing or printing fiber materials to give dyed products of high fastness properties with extremely high color depth.
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- Bisazo brown reactive dye
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A brown reactive dye represented by a free acid of the formula, STR1 wherein R is a hydrogen atom or a C1 to C4 alkyl group, X is --SO2 CH2 CH2 Cl, --SO2 CH=CH2, --SO2 CH2 CH2 OSO3 H or --SO2 CH2 CH2 OPO3 H2, rings A, B and C are each a benzene or naphthalene ring which may have other substituent, m is 0 to 3 and n is 0 to 1. This dye is suitable for dyeing cellulose fibers brown to afford dyeings superior in fastnesses, acid stability, build-up property and level dyeing property.
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- Fiber-reactive disazo brown dye having vinylsulfone-type reactive group
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A compound, or a salt thereof, represented by the following formula, STR1 wherein A is a substituted or unsubstituted phenylene or naphthylene group, B is STR2 in which R3 is a hydrogen atom or a lower alkyl, lower alkoxy, acylamino or ureido group, and R4 is a hydrogen atom or a lower alkyl or lower alkoxy group, R1 and R3 are independently a hydrogen atom or a substituted or unsubstituted lower alkyl group, X is a substituted or unsubstituted amino, lower alkoxy, substituted phenoxy or sulfo group, Y is --SO2 CH=CH2 or --SO2 CH2 CH2 Z, in which Z is a group capable of being split by the action of an alkali, and m is 2 or 3, which is useful for dyeing hydroxyl group- or amide group-containing fiber materials to give dyed products of a brown color having excellent fastness properties with good build-up property.
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- Reactive disazo dyestuffs containing triazines
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Reactive azo dyestuffs which, in the form of free acid, are represented by the following formula: STR1 (wherein R is hydrogen or methyl) are characterized by exhibiting the following properties: high fixation efficiency, excellent wash-off, high build-up and excellent wet fastness. Such dyestuffs give dyeings excellent in light fastness, chlorine fastness and color yield.
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- Azo dyestuffs
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Azo dyestuffs, which in the acid form, are represented by the formula: wherein A is an aromatic radical, M is a 1,4-benzene radical which may be substituted, E is the residue of a coupling component which is free from azo groups, At least one of A and M containing a phosphonic acid group, and the metal complexes of those having a metallisable group are reactive dyes suitable for use in the process of German OLS No. 2324809.
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- Process for producing amino G acid and amino J acid from tobias acid
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A novel process for producing 2-amino-6,8-naphthalenedisulfonic acid (Amino G Acid) and 2-amino-5,7-naphthalenedisulfonic acid (Amino J Acid) which comprises heating 2-amino-1-naphthalenesulfonic acid (Tobias Acid) in 100% sulfuric acid, sulfonating the heated mixture with sulfur trioxide at a temperature in the range of 90°C. to 150°C. and hydrolyzing the sulfonation product.
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