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 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 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:
The invention relates to a method for producing cyclohexenone derivatives of general formula (I), wherein R 1 represents hydrogen or OH; R 2 represents (Ia), comprising the following steps: (a) hydrolyzing a cyclohexenol compound of formula (II), wherein R 3 represents hydrogen and R 4 represents C 1 -C 6 -alkoxy or R 3 and R 4 represent vicinal hydroxy groups, which carry a common acetal protective group or a ketone protective group, R 5 represents (IIa), and R 6 represents a protected hydroxy group, in the absence of an organic solvent and in the presence of an acid catalyst; and; (b) extracting the reaction mixture by using a polar extracting agent.
Abstract:
The invention relates to a method for surface coating of apparatuses or parts of apparatuses used in chemical manufacturing. Walls of apparatuses, walls of containers and walls of reactors, dischargers, fixtures, pumps, filters, compressors, centrifuges, columns, dryers, comminuting machines, internal fittings and combinations are examples for said apparatuses or parts of apparatuses. The inventive method is characterised in that a metal layer or a metal polymer dispersion layer is currentlessly deposited on the apparatus/es or parts of apparatuses to be coated by contacting the parts to a metal electrolytic solution which contains a reduction means and optionally the dispersed polymer or polymer mixture in addition to the metal electrolyte, whereby at least one polymer is halogenated.
Abstract:
Procedimiento para la obtención de trietilendiamina, que presenta un grado de pureza > el 90 %, caracterizado porque se libera la trietilendiamina en bruto de los productos de elevado punto de ebullición y, a continuación, se evapora la trietilendiamina a partir de la mezcla, obtenida de este modo, y se hace pasar a través de un disolvente líquido.
Abstract:
The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.
Abstract:
The present invention relates to a process for coating apparatuses and apparatus parts for chemical plant construction-which are taken to mean, for example, apparatus, tank and reactor walls, discharge devices, valves, pumps, filters, compressors, centrifuges, columns, dryers, comminution machines, internals, packing elements and mixing elements-wherein a metal layer or a metal/polymer dispersion layer is deposited in an electroless manner on the apparatus(es) or apparatus part(s) to be coated by bringing the parts into contact with a metal electrolyte solution which, in addition to the metal electrolyte, comprises a reducing agent and optionally the polymer or polymer mixture to be deposited in dispersed form, where at least one polymer is halogenated.
Abstract:
The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.