Patent application number | Description | Published |
20080223711 | Industrial Process for Production of Aromatic Carbonate - It is an object of the present invention to provide, in the case of producing an aromatic carbonate through a reactive distillation system using a continuous multi-stage distillation column from a dialkyl carbonate and an aromatic monohydroxy compound, a specific process that enables the aromatic carbonate to be produced stably for a prolonged period of time on an industrial scale of not less than 1 ton/hr, while efficiently separating out a by-produced alcohol. Although there have been various proposals regarding processes for the production of aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. Moreover, there have been no disclosures on a specific process or apparatus enabling a large amount of an alcohol by-produced when producing the aromatic carbonate on an industrial scale using a reactive distillation system to be separated out efficiently and stably for a prolonged period of time. According to the present invention, there is proposed a continuous multi-stage distillation column A and a continuous multi-stage distillation column B which have specified structure, and a specific method in which these continuous multi-stage distillation columns are combined together, enabling the aromatic carbonate to be produced stably for a prolonged period of time on an industrial scale of not less than 1 ton/hr, while efficiently separating out a by-produced alcohol, preferably on an industrial scale of not less than 200 kg/hr. | 09-18-2008 |
20090018370 | Industrial process for production of diol - It is an object of the present invention to provide a specific apparatus and process for producing a diol by taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column A in which a catalyst is present, carrying out reactive distillation in the column A, continuously withdrawing a low boiling point reaction mixture A | 01-15-2009 |
20090030223 | PROCESS FOR INDUSTRIALLY PRODUCING DIALKYL CARBONATE AND DIOL WITH HIGH YIELD - It is an object of the present invention to provide a solution by providing a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there are provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, in which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours. | 01-29-2009 |
20090054676 | Industrial process for separating out dialkyl carbonate - It is an object of the present invention to provide a specific apparatus and process for using a single distillation column on a low boiling point reaction mixture containing a large amount of a dialkyl carbonate and an aliphatic monohydric alcohol produced through a reactive distillation process of taking a cyclic carbonate and the aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a homogeneous catalyst is present, and carrying out reaction and distillation simultaneously in the column, so as to separate the low boiling point reaction mixture by distillation into a column top component B | 02-26-2009 |
20090105494 | Industrial process for production of dialkyl carbonate and diol - It is an object of the present invention, when producing a dialkyl carbonate and a diol industrially in a large amount (e.g. not less than 2 ton/hr for the dialkyl carbonate and not less than 1.3 ton/hr for the diol) through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column, is to provide a specific process that enables the dialkyl carbonate and the diol to be produced each with high selectivity and high productivity stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours), and moreover enables the dialkyl carbonate produced to be separated out and purified stably for a prolonged period of time with high efficiency. It has been discovered that by carrying out reactive distillation using a continuous multi-stage distillation column A having a specified structure, and subjecting a column top component A | 04-23-2009 |
20090118530 | Industrial Process for Production of Aromatic Carbonate - It is an object of the present invention to provide a specific process that enables an aromatic carbonate required for producing a high-quality high-performance aromatic polycarbonate to be produced industrially in a large amount (e.g. not less than 1 ton/hr) stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours) from a cyclic carbonate and an aromatic monohydroxy compound. When producing an aromatic carbonate from a cyclic carbonate and an aromatic monohydroxy compound, the above object can be attained by carrying out a step of: (I) producing a dialkyl carbonate and a diol using a reactive distillation column having a specified structure, and (II) producing the an aromatic carbonate using a first reactive distillation column having a specified structure. | 05-07-2009 |
20090137833 | Process for industrially producing dialkyl carbonate and diol - It is an object of the present invention to provide a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, according to which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours. | 05-28-2009 |
20090143628 | Industrial process for production of high-purity diol - It is an object of the present invention to provide a specific apparatus and process for industrially producing a high-purity diol by taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials. More specifically, it is an object to thus provide a specific industrial apparatus and industrial production process that are inexpensive and, for example, enable the high-purity diol to be produced in an amount of not less than 1 ton/hr, preferably not less than 2 tons/hr, more preferably not less than 3 tons/hr, stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours). The above objects can be attained by using a continuous multi-stage distillation column E having a specified structure, and withdrawing a liquid component from the side cut outlet, which is installed at the bottom of a chimney tray having a specified structure installed in an enrichment section of the continuous multi-stage distillation column E. | 06-04-2009 |
20090149669 | Process for production of dialkyl carbonate and diol - It is an object of the present invention to provide, for a case of producing a dialkyl carbonate and a diol from a cyclic carbonate and an aliphatic monohydric alcohol, a process that simultaneously satisfies the cyclic carbonate conversion being high, the selectivities for the dialkyl carbonate and diol to be produced being high, and a high-purity diol having a high UV transmittance and a low aldehyde content being obtained without carrying out complicated treatment such as feeding water into a diol distillation purification step. The present invention discloses a process for the production of the dialkyl carbonate and the diol in which, when producing the dialkyl carbonate and the diol by reacting the cyclic carbonate and the aliphatic monohydric alcohol together in the presence of a catalyst in a transesterification reactor comprising a tray type continuous multi-stage distillation column, reaction conditions (residence times, temperatures) in the distillation column are controlled to be specific conditions. | 06-11-2009 |
20090156759 | Industrial process for production of high-quality aromatic polycarbonate - It is an object of the present invention to provide a specific process that enables a high-quality high-performance aromatic polycarbonate having excellent mechanical properties and no discoloration to be produced industrially in a large amount (e.g. not less than 1 ton/hr) stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours) from a dialkyl carbonate and an aromatic dihydroxy compound. When producing the aromatic polycarbonate from the dialkyl carbonate and the aromatic dihydroxy compound, the above object can be attained by carrying out a process of the present invention which comprises the step of; (I) producing a diaryl carbonate using two reactive distillation columns each having a specified structure: (II) purifying the diaryl carbonate so as to obtain a high-purity diaryl carbonate: (III) subsequently producing an aromatic polycarbonate using a guide-contacting downflow type polymerization apparatus having a specified structure from a molten prepolymer obtained from an aromatic dihydroxy compound and the high-purity diaryl carbonate: and (IV) recycling by-produced aromatic monohydroxy compound into the step (I). | 06-18-2009 |
20090156853 | Process for industrially producing dialkyl carbonate and diol - It is an object of the present invention to provide a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a production process using the continuous multi-stage distillation column having a specified structure that enables the dialkyl carbonate and the diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a high selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours, wherein the starting materials are introduced into specified stages of the distillation column, and the starting material aliphatic monohydric alcohol has a specified composition. As a result, the above object can be attained easily. | 06-18-2009 |
20090156865 | Industrial process for production of high-purity diol - It is an object of the present invention to provide a specific apparatus and process for producing a high-purity diol by taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column A in which a catalyst is present, carrying out reactive distillation in the column A, continuously withdrawing a low boiling point reaction mixture A | 06-18-2009 |
20090209724 | Process for industrially producing high-quality aromatic polycarbonate - It is an object of the present invention to provide a specific process that enables a high-quality high-performance aromatic polycarbonate having excellent mechanical properties and no discoloration to be produced industrially in a large amount (e.g. not less than 1 ton/hr) stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours) from a dialkyl carbonate and an aromatic dihydroxy compound. When producing the aromatic polycarbonate from the dialkyl carbonate and the aromatic dihydroxy compound, the above object can be attained by carrying out a process according to the present invention which comprises the steps of: (I) producing a diphenyl carbonate using two reactive distillation columns each having a specified structure; (II) obtaining a high-purity diphenyl carbonate from the diphenyl carbonate using a high boiling point material separating column A and a diphenyl carbonate purifying column B each having a specified structure; (III) subsequent producing an aromatic polycarbonate using a guide-contacting downflow type polymerization apparatus having a specified structure from a molten prepolymer obtained from the aromatic dihydroxy compound and the high-purity diphenyl carbonate; and (IV) recycling by-produced phenol into step (I). | 08-20-2009 |
20090253939 | Process for industrially producing dialkyl carbonate and diol - It is an object of the present invention to provide a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, according to which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours. | 10-08-2009 |
20090264670 | Process for industrially producing dialkyl carbonate and diol - It is an object of the present invention to provide a solution by providing a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, in which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours. | 10-22-2009 |
20090270656 | Industrial Process for Producing High-Purity Diol - It is an object of the present invention to provide a specific apparatus and process for industrially producing a high-purity diol by taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials. Moreover, it is an object to thus provide a specific industrial apparatus and industrial production process that are inexpensive and, for example, enable the high-purity diol to be produced in an amount of not less than 1 ton/hr, preferably not less than 2 tons/hr, more preferably not less than 3 tons/hr, stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours). According to the present invention, the above objects can be attained by using a continuous multi-stage distillation column A, a continuous multi-stage distillation column C, and a continuous multi-stage distillation column E, which have a specified structure, and withdrawing a liquid component from the side cut outlet, which is installed at the bottom of a chimney tray having a specified structure installed in an enrichment section of the continuous multi-stage distillation column E. | 10-29-2009 |
20090287014 | PROCESS FOR PRODUCTION OF HIGH-PURITY DIARYL CARBONATE - An aromatic polycarbonate that is obtained by transesterification between a high-purity diphenyl carbonate and an aromatic dihydroxy compound. A specific industrially useful process for the production of a high-purity diaryl carbonate in which a diaryl carbonate having low contents of intermediate boiling point and high boiling point impurities is produced is disclosed. As a starting material, a reaction mixture containing an alkyl aryl carbonate obtained through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound is used. The process in which separation by distillation is carried out uses three distillation columns in a specified order. Moreover, it is particularly preferable if a reactive distillation column and the three distillation columns, each of which has a specified structure, and the three distillation columns are each operated under specified distillation conditions. | 11-19-2009 |
20090326257 | Process for industrially producing dialkyl carbonate and diol - It is an object of the present invention to provide a specific process that enables dialkyl carbonates and diols to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking cyclic carbonates and aliphatic monohydric alcohols as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonates and the diols through a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there are provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, in which the dialkyl carbonates and the diols can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, with a high yield stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours. | 12-31-2009 |