PATENT CLAIM ANALYSIS

Application Number: 15762224
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-10
Patent Classification: ["422", "110000"]

Abstract:
The invention relates to a method for an economically and technically improved embodiment of a production interruption in a production method for isocyanates by phosgenation of the corresponding amines, in which the entire production plant is not closed while one or more parts of the plant is taken out of operation, rather the input materials and/or reaction products available in the production plant are recirculated through at least one part of the plant that has not been taken out of operation. The invention further relates to a plant for producing isocyanates and to a method for operating a plant for producing isocyanates.

Claim (Index 1):
A process for preparing isocyanates ( 1 ), comprising:\n I) reacting an amine with phosgene in the liquid phase in a reaction zone comprising\n I.6) a unit for providing an amine in the form of an amine solution in a solvent, \n I.7) a unit for providing phosgene in the form of a phosgene solution in a solvent, \n I.8) a unit for providing a solvent, \n I.9) a mixing unit for mixing the amine solution with the phosgene solution and optionally further solvent and \n I.10) a reaction space arranged downstream of the mixing unit, with a separator unit optionally connected downstream, \n wherein \n the amine, in the form of the amine solution with a mass flow rate m 2  from the unit for providing an amine and \n the phosgene, in the form of the phosgene solution with a mass flow rate m 3  from the unit for providing phosgene and \n optionally-solvent from the unit for providing a solvent with a mass flow rate m 4  are conducted into the mixing unit and mixed therein, and \n the mixture obtained is converted in the downstream reaction space and \n separated into a liquid stream comprising crude isocyanate and solvent, and a gaseous stream comprising phosgene and hydrogen chloride; \n II) separating the liquid stream from step I) into a liquid stream comprising solvent and crude isocyanate, and a gaseous stream comprising phosgene and hydrogen chloride in a distillation apparatus; III) separating the liquid stream obtained in II) into a gaseous stream comprising solvent and a liquid stream comprising crude isocyanate in a distillation apparatus; IV) separating the gaseous stream obtained in III), into a liquid stream comprising solvent and a gaseous stream comprising phosgene in a distillation apparatus; V) obtaining a liquid isocyanate stream from the liquid stream obtained in III), resulting in a gaseous stream comprising secondary components and optionally solvent, in a distillation apparatus, and which optionally comprises removing polymeric isocyanate fractions in an upstream unit for polymer removal as a separate stream; VI) absorbing the gaseous streams obtained in steps I), II) and IV) in solvent to obtain a liquid stream comprising solvent and phosgene, and a gaseous stream comprising hydrogen chloride in an absorption apparatus; VII) optionally, absorbing the gaseous stream obtained in VI) in water or dilute hydrochloric acid in an absorption apparatus; VIII) optionally, cleaning offgas streams at least from VII), in a workup apparatus configured to work-up offgas obtained from at least step VII); IX) optionally, preparing phosgene from carbon monoxide and chlorine in an apparatus configured to prepare phosgene, and which is connected to the unit for provision of phosgene;\n wherein the process is interrupted, the interruption comprising shutting down one or more, but not all, plant sections from (I) to (IX), reducing the mass flow rate m 2  to zero and, in at least one of the plant sections that has not been shut down, \n (i) recycling the output stream from this at least one plant section which has not been shut down into the respective plant section, \n or \n (ii) conducting the output stream from this at least one plant section which has not been shut down into a plant section which is upstream or downstream and thence, optionally via further plant sections that have not been shut down, recycling it into the original plant section.

Metadata:
- Claim Count in Document: 30.0
- Percentile: 90.0
- Lexical Diversity: 1.82759
- Patent Class: 422.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15128813', '16325809', '16327443', '15127826', '15762227']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8069623113890665
- 35 USC 102 Novelty (BERT): 0.5225998296302881
- Combined Prediction Score: 0.7785260632131886
- Mean Citation Score: 352.980354
- Max Citation Score: 358.66257
- Similarity Product: 262.14790100767493

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test