- Production process of 3, 3'-dichlorobenzidine hydrochloride
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The invention relates to a production process of 3, 3'-dichlorobenzidine hydrochloride, which belongs to the field of organic chemical industry, and is characterized in that o-nitrochlorobenzene is used as a main raw material to carry out catalytic hydrogenation reduction reaction, the obtained reduction product is rectified, and then the rectified target product 2, 2-dichlorohydroazobenzene is subjected to transposition and separation to obtain the 3, 3'-dichlorobenzidine hydrochloride. According to the method, zero emission of waste acid in production of 3, 3'-dichlorobenzidine is realized, waste acid pollution is completely eradicated, the key problem restricting production of 3, 3-dichlorobenzidine is solved, the byproduct 2-chloroaniline is realized, the economic benefit is improved, in addition, the production procedures are greatly reduced, the production efficiency is improved, and the energy consumption is reduced.
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Paragraph 0026-0028
(2021/10/27)
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- Surface-active compounds based on modified castor oil fatty substances
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The demands on the properties of pigments, in particular in the fields of emulsion paints and printing inks, which constantly become more specific have made it necessary to develop selective and environmentally friendly dispersing, emulsifying and coupling auxiliaries. The compounds according to the invention are esterification and/or arylation products prepared from natural or modified castor oil or ricinoleic acids, which products are alkoxylated and, if desired, linked by esterification with dicarboxylic acids to give recurring structural units. If desired, the terminal hydroxyl groups of these modified alkoxylates of castor oil fatty substances have been esterified with fatty acids, aromatic carboxylic acids and/or resin acids and any free hydroxyl groups which may be present have preferably been reacted with dicarboxylic acids and sulfite to give the corresponding monoesters containing anionic radicals. The compounds according to the invention are suitable for a wide range of applications in the field of surface-active agents, for example in the preparation of azo pigments, emulsion paints and printing inks, for improving the coloristic and rheological properties. The compounds according to the invention are particularly compatible with the environment owing to their biodegradability.
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- Basic azo dyestuffs of the 3-cyano-2,4,6-triamino pyridine series
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The new basic azo dyestuffs of the formula STR1 wherein the symbols have the meaning given in the description, are suitable for dyeing synthetic and naturally occurring substrates which can be dyed with basic dyestuffs.
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- Pigment compositions for solvent and water-based ink systems and the methods for producing them
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This invention is an azo pigment composition containing a water insoluble metal salt of a water soluble polymer; a method of preparing said composition and ink compositions prepared from said azo pigment compositions.
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- Azo pigment compositions and process for their preparation
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This invention is that of an azo pigment composition containing about 1 to 10 percent by weight of a nonionic alkyl polyglycoside dispersing agent. The polyglycosides useful in the invention have the general formulae: wherein: M is an oxygen, sulfur, nitrogen phosphorous or silicon atom; n is an integer from 8 to 18, preferably 8 to 11 and X represents the number average degree of polymerization having a numerical value from about 1 to about 2. These azo pigment compositions are prepared by conducting the azo pigment coupling reaction in the presence of said alkyl polyglycoside. The resulting pigment exhibit superior application properties in water based ink systems.
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- Dispersant-containing disazo pigment composition
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A disazo pigment composition which can provide a printing ink having excellent fluidity, gloss and storage stability, and which contains: a disazo pigment obtained by a coupling reaction between a tetrazo compound of dihalogenobenzidine and acetoacetanilides, and a reaction product from a coupling reaction between an acetoacetylation product and a tetrazo compound of dihalogenobenzidine.
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- 3,3'-Dichloro-4,4-diaminodiphenyl sulfonic acids
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The invention provides compounds having the formula I or II STR1 and their salts and hydrates, having high value as intermediates for dyestuff additives for pigment compositions and as intermediates for metal-containing pigments.
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- Aryloxy p-benzidine compounds
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There are provided substituted p-benzidines of the formula STR1 wherein Ar is phenyl or phenoxyphenyl.
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- Triazinyl reactive dyestuffs in which triazinyl group is further substituted with a beta-chloroethylsulfonyl- or vinylsulfonylbutyrylamino moiety
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Reactive dyes of the formula STR1 in which D is the radical of an organic dye of the monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthrone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide series, R is hydrogen or substituted or unsubstituted C1-4 -alkyl, X is a substituent which is detachable as an anion, B is a radical of the formula STR2 R1 and R2, independently of each other, are hydrogen or substituted or unsubstituted C1-4 -alkyl or phenyl, A is a substituted or unsubstituted aliphatic or aromatic bridge member, Y is a --CO--Z or --SO2 --Z radical, Z is an aliphatic, aromatic or heterocyclic reactive radical, and n is 1 or 2, are suitable for dyeing or printing cellulose-containing and nitrogen-containing materials and in high dyeing yield produce dyeings and prints having good fastness properties.
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- Process for the production of 2,3-dichlorobutadiene-(1,3)
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2,3-Dichlorobutadiene-(1,3) is obtained from 2,3,4-trichlorobutene-1 by dehydrohalogenation in the presence of a phase transfer catalyst, an inhibitor and oxygen according to an improved process in which the aqueous solution of an alkali metal hydroxide is added to the mixture of trichlorobutene, catalyst, inhibitor and optionally water, and the reaction is carried out at a temperature of from -10° to +60° C. under an inert gas which contains from 0.1 to 8% by weight of oxygen.
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- One step diazotization coupling process
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A process for producing metal-free azo pigments in purely organic liquid or aqueous/organic liquid containing at most 10% of water calculated on the total weight of the suspension is described. In this one-step process, a suitable aromatic amine is diazotized without isolation of the obtained diazo compound and coupled with a coupling component. Both reactions are carried out in purely or essentially organic medium. The latter consists essentially of such amount of an organic liquid that a substantial portion either of the diazo component or of the coupling component or of both these reactants remain undissolved. Both reactants must be free from sulphonic acid groups. If the resulting azo pigment contains carboxylic acid groups, these can be subsequently converted to the corresponding amido or ester groups.
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