The invention relates to a method for treating metal strip in a directly fired furnace through which the metal strip is guided. The furnace is fired directly by gas burners and has a non-fired zone through which the exhaust gases from the fired zone flow and thus heat the metal strip. After leaving the non-fired zone, the exhaust gases from the furnace undergo post-combustion in an afterburner chamber. According to the invention, methane is injected into the non-fired zone, which causes nitrogen oxides contained in the waste gas to be converted into hydrogen cyanide.

A heat treatment furnace device for heat-treating precursor fiber bundles of carbon fibers, having: a heat treatment chamber, in which continuously supplied precursor fiber bundles are treated with hot air, a hot air circulation path, through which hot air from the heat treatment chamber returns to the heat treatment chamber, and a condensation/separation device, into which the hot air flowing through the hot air circulation path is introduced and separated into a condensate and a gas; wherein the condensation/separation device has: a condensation treatment chamber and a condensation unit, which is provided in the condensation treatment chamber and has condensation surfaces on which the condensate is formed and allowed to drip down.

Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least two purification units and at least one regeneration unit wherein regenerated lean hybrid solvent and condensed water from the regeneration unit is used to reclaim additional purified fluid in the second purification unit.

It is an objective of the present invention to provide a gas separation method by which a removal performance to remove a removal object gas component and a recovery rate to recover a recovery object gas component can be satisfied at the same time, and furthermore, a generation efficiency of a product gas can be improved. A raw material gas g0 is fed to one adsorption vessel 11 of an adsorbing device 10 and a permeated gas g1 is sent out. A pressure of the other the adsorption vessels 12 is made lower than a pressure during adsorption and a desorbed gas g2 is sent out. In accordance with an operating cycle of the adsorbing device 10 or according to a condition of the raw material gas g0 or the like, one of the permeated gas g1 and the desorbed gas g2 that has a lower concentration of a priority removal object gas component than the raw material gas g0 is provided as a return gas to the adsorbing device 10, the priority removal object gas component being a gas component to be preferentially removed.

The invention relates to a cleaning device for separating an organic isocyanate produced by the reaction of an organic amine with a stoichiometric excess of phosgene in the gas phase from the gaseous raw product obtained in the reaction, said device comprising a first separating body comprising at least one raw product supply line for a gaseous raw product flow containing at least the isocyanate, hydrogen chloride and non-reacted phosgene, a first liquid supply line for a liquid flow containing at least one quench liquid, and a first liquid discharge line for a liquid flow containing at least part of the quench liquid and part of the isocyanate, a first gas line for transporting a gas flow containing at least hydrogen chloride, evaporated quench liquid and phosgene leading away from the first separating body. The invention is characterized in that at least one addition body for directly introducing at least one cooling fluid for an at least partial condensation and/or absorption of the gas flow that can be guided via the first gas line is associated with the first gas line.

This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has been modified by substituting some of the BTC ligand (1,3,5, benzene tricarboxylic acid) with 5-aminoisophthalic acid (AIA). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60 C. for 6 hours. This is an unexpected result versus the MOF containing only the BTC ligand. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.

This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has open coordination sites and has been post synthesis modified by partially occupying the open sites with a ligand such as acetonitrile (CH.sub.3CN). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60 C. for 6 hours. This is an unexpected result versus the MOF which has not been post treated with ligands such as acetonitrile. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.

The invention relates to a process for the preparation of alkali metal cyanides as a solid substance, comprising the steps of: i) an absorption step in the form of an absorption of hydrogen cyanide from a hydrogen cyanide-containing synthesis gas in an aqueous alkali metal hydroxide solution; ii) a crystallization step in the form of introducing said alkali metal cyanide solution into an evaporative crystallizer; iii) a separation step; iv) a recycle step; v) a drying step.

In a preferred embodiment, there is provided a process for separating an amine compound or a conjugate acid thereof and a carbamate compound or a conjugate acid thereof from a mixture having the amine compound, the carbamate compound, carbon dioxide and at least one anionic contaminant salt using an anionic exchange column, the process including passing the mixture through the column to obtain a first effluent and passing through the column an extraction fluid to obtain a second effluent, where the extraction fluid most preferably includes carbonic acid.

A gas purification device includes: a converter packed with a catalyst for hydrolyzing both carbonyl sulfide and hydrogen cyanide; an upstream heat exchanger for heat exchange between a gas to be introduced into the converter and a cooling fluid for cooling the gas; a reaction-temperature estimation member for estimating a reaction temperature inside the converter; and a flow-rate adjustment member for adjusting a flow rate of the cooling fluid flowing into the upstream heat exchanger based on an estimated value of the reaction-temperature estimation member to control the reaction temperature.