Abstract: The present invention relates to a method of removing an absorbate from gases or gas mixtures containing absorbate, in which the gas or gas mixture is contacted by a liquid mixture of absorption agent and absorbate or of liquid absorbate-free absorption agent, wherein the absorbate is absorbed at least partially by the liquid mixture of absorption agent and absorbate and is concentrated therein or is absorbed by the liquid absorbate-free absorption agent while forming a liquid mixture of absorption agent and absorbate. It is characteristic in the method in accordance with the present invention that the absorption agent used and the absorbate used have a miscibility gap.

Abstract: In a process of manufacturing polylactide, synthesis of high-quality polymers is achieved with a sufficient degree of vacuum secured. Provided is an apparatus for manufacturing polylactide which includes the steps of preparing lactide through oligomerization of lactic acid and depolymerization of the resulting oligomers, effecting ring-opening polymerization of the lactide, and removing unreacted lactide. The apparatus comprises an exhausting gas treatment device for reducing pressure in the step of removing unreacted lactide.

Abstract: The present invention relates to a method for removing at least one contaminant from a gaseous stream substantially comprising carbon dioxide. More specifically said method comprising the step of subjecting the gaseous stream to an absorption step in which the absorbent is liquid carbon dioxide.

Abstract: Method for purifying hydrogen chloride gas containing aromatic organic compounds, comprising at least one step of contacting the said hydrogen chloride with a scrubbing agent containing 1,2-dichlorethane.

Abstract: The invention relates to a process for absorbing vapors and gasses by controlling overpressure in storage tanks during filling, transport and storing of fluids in liquid form. The process includes leading of gas down to the bottom of the tank, where a major part of the gas is absorbed in the tank's own liquid in an absorption device or optionally the liquid is supplied from an external source.

Abstract: An improved method and apparatus for oxidizing undesired compounds residing within a liquid glycol based absorbent wherein the compounds are heated within a reboiler chamber to their boiling point to effectuate production of vaporized effluents. The absorbent's vaporized effluents rise upwardly exiting the reboiler chamber and enter a reflux tower wherein they are partially condensed via a condenser embodied within the interior of the tower. The residual uncondensed effluents are then transported to and first heated via a vaporizer/heat exchanger, thus effectuating the vaporization of any ambient condensed liquids contained within the effluents. The revaporized effluents then enter the invention's thermal oxidizer combustion chamber where they are second heated to a temperature necessary to effectuate destruction of undesirable compounds, such as but not limited to benzene, toluene and xylene.

Abstract: Moisture is removed from gas by contacting the gas with a solution of potassium formate to remove moisture from the gas, regenerating the potassium formate solution by removing water from it, and returning the potassium formate solution to contact gas to dehydrate it. Regeneration of the potassium formate solution is most preferably accomplished in a cavitation regenerator. The gas is most preferably natural gas.

Abstract: In accordance with the invention, there is provided a method of binding a gas or volatile compound in a cucurbituril, by contacting the gas or volatile compound with the cucurbituril to form a cucurbituril-gas/volatile complex. There is also provided a method of separating a gas or volatile compound from a mixture of compounds wherein the mixture is contacted with a cucurbituril and whereby at least some of the gas or volatile compound is bound to the cucurbituril to form a cucurbituril complex, followed by the release of at least some of the bound gas or volatile compound from that complex. The present invention is thus advantageous in that it allows use of cucurbiturils in binding gases and volatile compounds for storage, safety, delivery or other uses, such as the trapping of an unpleasant or toxic gas or volatile compound.

Abstract: Prior to passing through pumping apparatus effluent gas containing hydrocarbons is subjected to washing by being sprayed with aromatic type oil in oil-recirculating washing apparatus. Polycyclic aromatic hydrocarbons contained in the effluent gas are trapped by being absorbed in the oil. The method is suitable for treating effluent gas coming from an installation for chemical vapor deposition or infiltration using a reagent gas containing a precursor for pyrolytic carbon, or else coming from a cementation installation.

Abstract: A process for the removal of contaminants from a gas, using a gas cleaning agent, which contamination is selected from the group comprising aromatic hydrocarbons and (poly)halogenated aromatic hydrocarbons. For the removal of the contaminant a detergent is added as gas cleaning agent. The detergent is selected from a group formed by an anionic detergent, non-ionic detergent and a mixture thereof.

Abstract: A method is provided for the extraction of aromatic hydrocarbons, including benzene, toluene, ethylbenzene, and xylene, collectively known as “BTEX,” in a continuous process utilizing a glycol contactor to cause absorption of the BTEX upstream of an amine-based gas sweetening process. The preferred glycol for BTEX absorption is triethylene glycol. The glycol used in the glycol contactor for BTEX extraction may either be fully regenerated (dry), or wet glycol from a downstream gas dehydration system. The method may be achieved with the use of a number of separate absorber/contactor vessels, or the method may be achieved within one combination vessel.

Abstract: A method and apparatus for removing TDI from a gas in which the gas containing the TDI is forced through a scrubber tank. A first water spray is in fluid communication with the gas flowing through an inlet pipe and initially reacts the TDI in the gas with water. The gas is directed against a water surface at the bottom of the tank and thereafter, flows up an interior side wall of the tank. Deflectors mounted on the side wall disrupt the laminar flow of the gas and redirect it in a turbulent manner through a second water spray prior to the gas exiting the scrubber tank.

Abstract: The invention is a process for the preferential removal of a variable amount of alkynes and multiunsaturates from a gas stream containing at least hydrogen, olefins, alkynes, and multiunsaturates by contacting a gas stream containing H.sub.2, olefins, alkynes and multiunsaturates with a metal complex-containing stream selected from the group consisting of liquids and slurries, at conditions sufficient to form multiunsaturate adducts of the metal complex, by introducing the metal complex stream at a rate sufficient to form stoichiometric adducts of the alkynes and multiunsaturates to be removed, and removing the alkyne and multiunsaturate adducts of the metal complex. The invention has utility for removal of multiunsaturates from multicomponent syngas streams.

Abstract: Disclosed is a process for removing emissions from caprolactam polymerization operations and thermoplastic polycaprolactam processing operations by collecting air containing the emissions, directing the air, containing the emissions, to a candle filter in a candle filter housing and rinsing the air, containing the emissions, within the candle filter with an aqueous caprolactam solution, containing at least 4% by weight caprolactam.

Abstract: A method and system are described to remove solvent vapors emanating from a source in a work place. The air stream is passed through a fogging chamber in which a plurality of ultrasonic foggers are used to create a supersaturated condition in the form of vapor and droplets of a scrubbing liquid such as water. The supersaturated condition is accompanied with a large amount of turbulence and mixing flows throughout the chamber to reduce the ability of solvent vapors from bypassing contact with the scrubbing liquid. The scrubbing liquid droplets and vapor are then condensed out in a cooling condenser and collected to leave a scrubbed air stream from which a substantial amount of the solvent vapors is removed. The scrubbed cooled air stream may then be recirculated for reuse in the work place. Several embodiments are shown and described including a scrubbing system in which several fogging chambers and condensers are used in tandem for an enhanced removal of solvent vapor from the air stream.