摘要:
A process has been provided for the preparation of nitro-T-acid by nitration of naphthalene-1,3,6-trisulphonic acid from a nitration mixture which has reacted to the extent of at least 80% which naphthalene-1,3,6-trisulphonic acid or a mixture containing the latter. Nitro-T-acid (and T-acid) is an intermediate for the preparation of H-acid which, in turn, is an intermediate for the preparation of dyestuffs.
摘要:
A process has been invented for the preparation of a mono-alkali metal salt of 1-amino-8-naphthol-3,6-disulphonic acid comprising reacting 1-naphthylamine-3,6,8-trisulphonic acid and/or a salt thereof and/or a naphthylamine-trisulphonic acid isomer mixture and/or salt thereof with an alkali metal hydroxide solution at elevated pressure and elevated temperature and in the presence of an alcohol or alcoholate, and separating out the mono-alkali metal salt by acidification. The process results in the procurement of higher yields of the desired product and in the formation of less by-products.
摘要:
A process has been invented for the preparation of a mono-alkali metal of 1-amino-8-naphthol-3,6-disulphonic acid, comprising reacting 1-naphthylamine-3,6,8-trisulphonic acid and/or a salt thereof and/or a naphthylamine trisulphonic acid isomer mixture and/or salt thereof with an alkali metal hydroxide solution in the presence of an alcohol and/or alcoholate and in the presence of a substance which contains at least one oxygen atom bonded to a nitrogen atom, at elevated pressure and elevated temperature, and separating out the mono-alkali metal salt of 1-amino-8-naphthol-3,6-disulphonic acid by acidification. The process results in the procurement of higher yields of the desired product and in the formation of less by-products.
摘要:
A process has been invented for the preparation of naphthalene-1,3,6-trisulphonic acid by sulphonating naphthalene with sulphuric acid and oleum, characterized in that naphthalene and most of the oleum are simultaneously metered into sulphuric acid or oleum of low concentration, which has been initially introduced, at about 140.degree. to 240.degree. C., the temperature is kept at about 140.degree. to 240.degree. C. for some time, the remainder of the oleum is then added at about 140.degree. to 240.degree. C. and the mixture is then further stirred for some time.Naphthalene-1,3,6-trisulphonic acid is a known important intermediate used, for example, in the preparation of T-acid, H-acid and chromotropic acid.
摘要:
A polytrimerizable mixture of30 to 99.9% by weight of at least one aromatic, polyfunctional cyanic acid ester or a prepolymer thereof, and0.1 to 70% by weight of at least one high-boiling ester with a boiling point above 250.degree. C at 760 Torr,Said mixture results in polytriazines having a significant improvement in elasticity, flexibility and resistance to hydrolysis.
摘要:
Process for the preparation of s-triazine prepolymers which comprisesA. condensing a hydroxy compound which has 2 or more alcoholic hydroxyl groups;B. condensing the resulting condensation product with an aromatic hydroxy compound; andC. thereafter reacting the free hydroxyl groups of the condensation product obtained from (b) with cyanogen halide and in the presence of a base.
摘要:
Highly pure aromatic polyfunctional cyanic acid esters having a high stability in storage and being extraordinary suitable for use as starting compound for the production of plastics by cyclopoly-trimerization are obtained by a special process. Alkaline earth and/or alkali metal salts of polyfunctional aromatic hydroxy compounds said alkaline earth and/or alkali metal compound capable of phenolate formation are used in excess of up to 0.1 mol per mol of aromatic hydroxy group are reacted with an excess of cyanogen halide. The cyanogen halide excess comprises up to 1 mol per mol of aromatic hydroxy group plus excess mol of the metal compound used for salt production.
摘要:
S-Triazine prepolymers, useful in the preparation of polytriazines, are prepared by condensing an aromatic dihydroxy or polyhydroxy compound with less than one-third mol of cyanuric chloride per hydroxy group. Thereafter the free hydroxy groups in the condensation product are reacted with a cyanogen halide in the presence of a base. The condensation is preferably carried out in a melt at temperatures of from 100.degree.-240.degree.C.
摘要:
A process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid from 2-hydroxy-naphthalene-6-sulphonic acid which comprises:A. contacting 2-hydroxy-naphthalene-6-sulphonic acid with at least an equimolar amount of an alkali metal nitrite in aqueous solution or suspension in the presence of hydrochloric acid, solution or suspension having a pH in the range of 2 to 5 and being at a temperature of 0.degree. to 20.degree. C.;B. reducing the reaction product of step A in an aqueous suspension by contacting the same with excess iron in the presence of at least an equivalent amount of iron-II ions, relative to the reaction product obtained according to step A, in the presence of a mineral acid at a temperature from 50.degree. to 120.degree. C., and treating the thus-obtained reaction mixture with aqueous alkali metal hydroxide in the presence of iron oxide;C. contacting the product of step B with excess acetic anhydride in an aqueous solution or suspension at a pH in the range of 3 to 10 at a temperature from 0.degree. to 100.degree. C.;D. contacting the product of step C with an ethylating agent in the presence of an acid binding agent in an aqueous-organic solvent or diluent in a pH range from 8 to 14 at a temperature from 20.degree. to 150.degree. C.; andE. deacetylating the product of step D by contacting the same at reflux with an aqueous alkali metal hydroxide.
摘要:
1-Amino-naphthalene-7-sulphonic acid is prepared by reacting 1-chloro-naphthalene-4,7-disulphonic acid with ammonia at elevated temperatures in the presence of water and optionally in the presence of a catalyst such as a copper catalyst.