Abstract:
Production of esters of acetic acid by reaction of ketenes with alcohols in the presence of metal sulfides. The products are valuable intermediates, for example for adhesives and photographic film, and some of them are important solvents, for example for surface coatings.
Abstract:
PROBLEM TO BE SOLVED: To provide an amination catalyst small in the content of nickel and/or cobalt and having high selectivity and high stability about ethylene diamine obtained by aminating monoethanol amine with ammonia. SOLUTION: The catalyst is carried on a porous metal oxide carrier. And the catalyst contains 0.1-6wt.% cobalt, nickel or the mixture, 0.001-25wt.% ruthenium, 0-10wt.% copper and 0-5wt.% accelerator selected from iron, rhodium, palladium, platina, iridium, osmium, silver, gold, chromium, molybdenum, tungsten, rhenium, zinc, cadmium, lead, manganese, tin lithium, sodium, potassium, rubidium, cesium, phosphorus, arsenic, antimony, bismuth, tellurium, thallium and the mixture per total weight of the catalyst.
Abstract:
PROBLEM TO BE SOLVED: To provide an economical and efficient method for producing one or more ethanolamines (I) from one or more ethanolamines (II) different from ethanolamine (I). SOLUTION: The method for producing one or more ethanolamines (I) selected from a group consisting of monoethanolamine, diethanolamine and triethanolamine by converting one or more ethanolamines (II) which are selected from a group consisting of monoethanoamine, diethanolamine, triethanolamine, O,N,N-tris(2-hydroxyethyl)ethanolamine, N-(2-aminoethyl)ethanolamine, N-(2- hydroxyethyl) piperazine, N-(2-hydroxyethyl)morpholine and N,N'-bis(2- hydroxyethyl)piperazine, and are different from ethanolamine (I), is characterized by treating with strong base, if necessary, in the presence of ammonia.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an alkanolamine diminished in discoloration determined by e.g. APHA color number and improved in color stability over a long storage period. SOLUTION: This method for producing an alkanolamine comprises the following steps: step (a): the original alkanolamine is treated with an effective amount of phosphorous acid, hypophosphorous acid or a compound thereof at an elevated temperature for 5 min or longer, and subsequently, step b: the resultant alkanolamine is distilled in the presence of an effective amount of one of the above phosphorus compounds.
Abstract:
PROBLEM TO BE SOLVED: To find out an economical, selective and efficient method for producing an alkanolamine having improved color quality as opposed to a conventional method. SOLUTION: This method for producing the alkanolamine having the improved color quality and good in color stability comprises using a supported heterogeneous catalyst comprising a noble metal of Re, Ru, Rh, Pd, Os, Ir, Pt and/or Ag and a carrier material selected from the group of active carbon, α-aluminum oxide, zirconium dioxide and titanium dioxide as a hydrogenating catalyst in which the catalyst has a prescribed hardness of at least 10 N cutting hardness and prescribed strengths of at least 30 N laterial pressure strength and at least 25 N stamping strength in the case of active carbon as the carrier material in the method for producing the alkanolamine having the improved color quality by treating an alkanolamine using hydrogen at a high temperature in the presence of the hydrogenating catalyst. Thereby, the alkanolamine is economically produced.
Abstract:
The continuous production of diketene by dimerizing ketene in diketene containing ketene as a solvent using specific temperature conditions and concentrations. Diketene prepared by the process is a starting material for the production of acetoacetic esters, dyes, solvents and pesticides.
Abstract:
Continuous production of alkali metal salts of nitrilotriacetic acid from an alkali metal cyanide, formaldehyde and ammonia by reaction of the components in at least two stages, the alkali metal cyanide being reacted with formaldehyde in stoichiometric or substantially stoichiometric ratio at temperatures of 50* to 200* and pressures of from atmospheric pressure to 50 atmospheres gauge in the presence of an excess of ammonia in the first stage and (while simultaneously removing ammonia) further amounts of alkali metal cyanide and formaldehyde being allowed to act at temperatures of 60* to 110*C in one or more subsequent stages, 5 to 35 mole percent of the total amount of alkali metal cyanide required being replaced by free hydrocyanic acid and/or hydroxyacetonitrile.
Abstract:
Production of alkali metal salts of nitrilotriacetic acid from an alkali metal cyanide, formaldehyde and ammonia by reaction in at least two stages, the alkali metal cyanide being reacted with formaldehyde in approximately stoichiometric ratio of 50* to 200* C. and 2 to 50 atmospheres gauge in the presence of an excess of ammonia in the first stage and the resultant solution (after decompression to atmospheric pressure) being treated in one or more further stages with further amounts of alkali metal cyanide and formaldehyde at 60* to 110* C. while removing ammonia at the same time.
Abstract:
A continuous process for the production of alkali metal salts of nitrilotriacetic acid by reaction in a first stage of alkali metal cyanide, formaldehyde and excess ammonia at superatmospheric pressure and elevated temperature to form an aminoacetic acid solution, followed by depressurizing and treating the solution obtained with further amounts of alkali metal cyanide and formaldehyde while removing the ammonia formed until conversion to nitrilotriacetic acid is complete.