Abstract:
PROBLEM TO BE SOLVED: To provide an improved process for purifying crude triethylenediamine (TEDA) with high quality and high purity in a simple and inexpensive process. SOLUTION: The process purifies triethylenediamine (TEDA) by distillation, wherein the fractionation is carried out in a dividing wall column. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for preparing triethylenediamine (TEDA) solution in an alcohol and/or an ether. SOLUTION: The method for preparing TEDA solutions containing solvents selected from a group consisting monohydric alcohols and ethers of monohydric alcohols, comprises (a) a process passing gaseous TEDA into the solvents and (b) subsequently treating the solutions with one or more suitable adsorbents. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To improve qualities of piperazine, especially its color and color stability in a method for continuously distilling and removing piperazine from a mixture of ethylenediamine and piperazine by distilling the mixture under high-pressure at elevated temperature, discharging ethylenediamine from the top of a distillation column and piperazine from the bottom of the distillation column. SOLUTION: The method for continuously distilling and removing piperazine from a mixture of ethylenediamine and piperazine comprises a process of direct circulation treatment in which piperazine discharged from the bottom of the distillation column is transported through an evaporation apparatus operated at about 160-about 170°C and returned to the distillation apparatus and a process in which piperazine is retained in a system for the circulation treatment for 30-about 60 minutes and then discharged in a state of vapor from a side discharge port at the bottom of the distillation column. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for purifying triethylenediamine(TEDA) by evaporating TEDA, transferring the gas state TEDA into a liquid solvent and then continuously crystallizing from the solvent, enabling the re-circulation of at least a part of the used solvent into the purification method and also increasing the yield of the TEDA. SOLUTION: This method for purifying the TEDA is provided by extraction- treating a mother liquor obtained after the crystallization of the TEDA by using an extraction agent which is incompatible or slightly compatible with the solvent of the mother liquor and in which the TEDA is easily dissolvable, and returning the mother liquor poor in the TEDA obtained after the extraction and/or the extraction agent rich in the TEDA and used for the extraction to the purification method.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of production for triethylene diamine by reacting ethylene diamine in the presence of a zeolite catalyst manifesting high yield, selectivity and catalyst service life and low in formation of piperazine which is unavoidable and giving high purity and color stability and quality of odor of the product. SOLUTION: This zeolite catalyst includes a metal M having one or more oxidized state such as II, III or IV as a metal oxide, and in the case of M=Al the molar ratio of SiO2 /M2 O3 >=1400/1 and in the case of M is a metal manifesting the II oxidized state or M are two or more metals manifesting the II oxidized state, the molar ratio of SiO2 /MO>=100/1 and in the case of M is a metal manifesting the III oxidized state or M are two or more metals manifesting the III oxidized state the molar ratio of SiO2 /M2 O3 >=100/1 and in the case of M is a metal manifesting the IV oxidized state or M are two or more metals manifesting the IV oxidized state the molar ratio of SiO2 / MO2 >=10/1 and the reaction temperature is 250-500 deg.C.
Abstract:
PROBLEM TO BE SOLVED: To provide an efficient and economical method for production by which pure tetraethylenediamine(TEDA) and its solution are improved in order to obtain the TEDA and TEDA solution of improved quality in relation to color, color stability, odor and purity. SOLUTION: This method for producing the solution of the triethylenediamine(TEDA) comprises evaporating the TEDA from a mixture containing a solvent or a diluent wherein the solvent or diluent has 170-250 deg.C boiling point under atmospheric pressure (=1.01325 bars) and passing the TEDA in the form of vapor through a liquid solvent.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing 2-methyl-4-amino-5- aminomethylpyrimidine by starting from β-alkoxypropionitrile of a precursor. SOLUTION: This method for producing the 2-methyl-4-amino-5- aminomethylpyrimidine of formula 1 comprises reacting 2-methyl-4-amino-5- alkoxymethylpyrimidine of formula 2 (wherein, R is a 1-6C alkyl) with ammonia in the presence of a catalyst.
Abstract:
The invention relates to a method for distillative separation of triethanolamin from a substance mixture consisting of mono- di-, and triethanolamin, ethanolamin-ether and water obtainable by an ammonia and ethylene oxide reaction in a liquid phase at a high pressure and temperature consisting in distilling the substance mixture in two stages. In the first stage, a low-boiling fraction and a high-boiling fraction are withdrawn and discharged, and in the second stage, a medium-boiling fractions is distilled at a triethanolamin content >99.4 % by weight and a diethanolamin content
Abstract:
The invention relates to a method for distillative separation of triethanolamin from a substance mixture consisting of mono- di-, and triethanolamin, ethanolamin-ether and water obtainable by an ammonia and ethylene oxide reaction in a liquid phase at a high pressure and temperature consisting in distilling the substance mixture in two stages. In the first stage, a low-boiling fraction and a high-boiling fraction are withdrawn and discharged, and in the second stage, a medium-boiling fractions is distilled at a triethanolamin content >99.4 % by weight and a diethanolamin content