What is proposed is a method for the cryogenic separation of air (AIR) in an air separation plant (100) having a main air compressor (2), a main heat exchanger (4) and a distillation column system (10) having a low-pressure column (11) operated at a first pressure and a high-pressure column (12) operated at a second pressure, in which a feed air flow (a), which comprises all of the feed air fed to the air separation plant (100, 200), is compressed in the main air compressor (2) to a third pressure that is at least 2 bar above the second pressure, wherein a first fraction (c) of the compressed feed air flow (b) is cooled at least once in the main heat exchanger (4) and is expanded from the third pressure in a first expansion turbine (5), a second fraction (d) is cooled at least once in the main heat exchanger (4) and is expanded from the third pressure in a second expansion turbine (6), and a third fraction (e) is further compressed to a fourth pressure, is cooled at least once in the main heat exchanger (4) and is expanded from the fourth pressure, wherein air of the first fraction (c) and/or of the second fraction (d) and/or of the third fraction (e) is fed into the distillation column system (10) at the first and/or at the second pressure. It is provided that the third fraction (e) is further compressed to the fourth pressure in sequence in a recompressor (7), a hot first turbine booster and a second turbine booster, and for expanding the third fraction (e) use is made of a dense fluid expander (8) to which the third fraction (e) is fed in the liquid state and at the fourth pressure. The invention also relates to an air separation plant (100).

The present invention relates to: a method for producing an α-olefin oligomer by performing an oligomerization reaction of an α-olefin in a reaction solvent within a reactor in the presence of a catalyst, wherein a non-concentrated gas and a condensate liquid obtained from an outlet port of a heat exchanger by introducing some of a gas in the gas phase part within the reactor into the heat exchanger and cooling the gas in the heat exchanger are circulated and supplied to the reactor, and wherein the temperature of the liquid phase part within the reactor is from 110°C to 150°C and the outlet temperature of the heat exchanger is from 50°C to 100°C; and an apparatus for producing an α-olefin oligomer.

The present invention is related to a tamper-evident closure and to a tamper-evident closure-container combination having specially designed features. The features comprise a tamper-evidence and a tear away band (6) which can be pulled out in anti-clockwise direction around the periphery of the container. The closure (1) has primary (9) and secondary (11) locking facilities which allow the container to be used effectively. The container is shaped and configured such that the closure fits into the sections defined so that a primary zone or zones of weight transfer between the closure and the container occurs at the surface of the side wall of the container. The closure is shaped and configured to take up the load of the container when they are arranged atop each other and transfer the same to the side walls of the container.

The present invention addresses the problem of providing an acrylic acid production device for producing acrylic acid from liquefied propylene, said production device making it possible to effectively utilize energy and also to perform a stopping operation efficiently and in a short period of time. This acrylic acid production device is provided with a starting material gasification device that converts liquefied propylene into a propylene gas, an oxidation reactor that converts the propylene gas into crude acrylic acid, and a purification device that converts the crude acrylic acid into acrylic acid. The starting material gasification device has a heat transfer device inside and has a heating device in an outer peripheral portion which includes at least the bottom of the starting material gasification device.

Provided are improved device for preparing phosphoric acid from kiln egression flue gas of a phosphoric acid process of a kiln method, and a phosphoric acid preparing process. The process comprises: introducing the kiln egression flue gas that contains P2O5 and fluorine to a hydration tower (1), and before the introducing, opening an acid liquor circulation spraying system connected to the hydrated tower (1), wherein a great portion of the phosphoric acid generated in the heat and mass exchanging between the flue gas and spraying liquid is absorbed into the spraying liquid; allowing the sprayed phosphoric acid solution to circulate into the acid liquid circulation spray system finally through a liquid inlet (14); then allowing the egression flue gas from an egression flue gas outlet (12) to pass through a phosphoric acid gas scrubber (3) and an electrostatic mist precipitator (4) in sequence, so that phosphoric acid gas mixed in the egression flue gas from the hydrated tower (1) is further collected, and the concentrated phosphoric acid solution in the acid liquid circulation spray system can enter a refining process; and allowing the flue gas containing fluorine from a mist separation tower to enter a follow-up fluorine recycling processing.