摘要:
Lower trialkanolamines such as triethanolamine and triisopropanolamine are converted to the corresponding mono- and dialkanolamine by reacting with ammonia at about 150.degree. C.-275.degree. C. under superatmospheric pressure in the presence of a hydrogenation catalyst. The process is particularly useful for the recovery of alkanolamine values from still bottoms of alkanolamine production processes.
摘要:
A method for the formation of monoalkyleneglycols, monoalkanolamines and alkylenediamines, comprising the steps of: (a) reacting ammonia or ammonium carbonate with an alkylenecarbonate to form a carbamate, (b) heating the carbamate to form a monoalkyleneglycol, an alkyleneurea and a 2-oxazolidinone, (c) further reacting the alkyleneurea and the 2-oxazolidinone with ammonium hydroxide to form ammonia or ammonium carbonate, a monoalkanolamine, and an alkylenediamine, (d) separating the ammonia or ammonium carbonate, the monoalkyleneglycol, the alkylenediamine, and the monoalkanolamine, and (e) recycling the ammonia or ammonium carbonate to reaction step (a).
摘要:
D-2-Amino-1-butanol, for the synthesis of ethambutol hydrochloride, d,d'-2,2'-(ethylenediimino)di-1-butanol dihydrochloride, is produced in high purity and good yields by the reaction of butene-1, a nitrile, preferably an excess of acetonitrile, and chlorine to form N-[1-(chloromethyl)propyl]acetimidoyl chloride which is hydrolyzed to dl-2-amino-1-butanol, which can be isolated as the hydrochloride, or free base, or a mixture, resolved with L(+)-tartaric acid and the d-2-amino-1-butanol reacted with ethylene dichloride and then hydrochloric acid to form ethambutol hydrochloride. A minimum of by-products which are conveniently split out permits the economical synthesis of a pharmaceutical grade product.
摘要:
A process for the production of unsubstituted and lower alkyl substituted p-aminophenols. A charge mixture is prepared comprising an unsubstituted or lower alkyl substituted nitrobenzene substrate, a platinum catalyst and a sulfur compound. The sulfur compound may be a divalent sulfur compound in which sulfur is bonded to two other moieties or a compound reducible to such sulfur compound under catalytic hydrogenation conditions. Hydrogen is introduced into the mixture while it is agitated at a temperature of 0.degree.-40.degree. C., thereby reducing the substrate to an unsubstituted or alkyl substituted phenylhydroxylamine. The hydroxylamine is thereafter heated to a temperature of at least 70.degree. C. and agitated at at least 70.degree. C. in the presence of a highly dissociated acid, thereby effecting rearrangement of the hydroxylamine to the corresponding p-aminophenol.
摘要:
A process for producing p-hydroxybenzaldehyde through p-aminobenzaldehyde from p-nitrotoluene, comprising reacting p-nitrotoluene with sodium polysulphide in an alcohol-alkali aqueous solution mixed solvent in the presence or absence of an aprotic polar compound to produce p-aminobenzaldehyde, diazotizing the p-aminobenzaldehyde and then hydrolyzing the diazotized p-aminobenzaldehyde to produce p-hydroxybenzaldehyde.
摘要:
A process for the direct production of aminophenol and N-acetyl-p-aminophenol from nitrophenols using a borate ion additive during hydrogenation to eliminate undesirable by-products and color formation.
摘要:
A process is provided for producing bis-(N,N-dialkylamino)alkyl ethers of the formula (R.sub.2 NR').sub.2 O, wherein R is a methyl or ethyl group and R' is a bivalent alkylene group having from 2 to 3 carbon atoms. The novel process is effected by a two-step, preferably "one pot," reaction that utilizes SO.sub.3 vapor and R.sub.2 NR'ONa as reactants, wherein R and R' are defined above. The resulting bis-ethers are useful as catalysts in the production of polyurethanes, especially cellular polyurethanes.
摘要:
An improved catalyst for the complete hydrogenation of acetylenically unsaturated alcohols and based on nickel, copper and manganese. The catalyst is used without a support and molybdenum is additionally included in an amount approximately equal to the content of manganese.
摘要:
A process for producing (+)-2-amino-1-butanol comprising optically resolving an N-acyl-DL-aminobutyric acid using an acylase to obtain L-2-aminobutyric acid and an N-acyl-D-aminobutyric acid which is recycled after racemization, esterifying the L-2-aminobutyric acid to form L-2-aminobutyric acid ester, and reducing the L-2-aminobutyric acid ester to form (+)-2-amino-1-butanol.