172 results about "Zeotropic mixture" patented technology

A process for treating mixtures of organic components, including azeotropic mixtures. The process includes a gas- or liquid-phase membrane separation step in conjunction with a dephlegmation step to treat at least a portion of the permeate vapor from the pervaporation step. The process yields a membrane residue stream, a stream enriched in the more volatile component as the overhead stream from the dephlegmator and a condensate stream enriched in the less volatile component as a bottoms stream from the dephlegmator. Any of these may be the principal product of the process.

A thermoelectric energy storage system and method are provided for storing electrical energy by transferring thermal energy to a thermal storage in a charging cycle, and for generating electricity by retrieving the thermal energy from the thermal storage in a discharging cycle. The thermoelectric energy storage includes a working fluid circuit configured to circulate a working fluid through a heat exchanger, and a thermal storage conduit configured to transfer a thermal storage medium from a thermal storage tank through the heat exchanger. The working fluid includes a zeotropic mixture. The working fluid is in a mixed vapor and liquid phase and has continuously rising or continuously falling temperature during heat transfer due to the working fluid including the zeotropic mixture.

A method and system for generating power from low- and mid-temperature heat sources using a zeotropic mixture as a working fluid. The zeotropic mixture working fluid is compressed to pressures above critical and heated to a supercritical state. The zeotropic mixture working fluid is then expanded to extract power. The zeotropic mixture working fluid is then condensed, subcooled, and collected for recirculation and recompression.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of a C1-C3 alcohol, a C5-C6 hydrocarbon, a halogenated hydrocarbon, methylal, methyl acetone, water, nitromethane, and combinations thereof.

A composition useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and a gas selected from the group consisting of a fluorohydrocarbon, perfluorocarbons, fluoroethers, hydrofluoropolyethers and mixtures thereof is disclosed. A polyisocyanurate foam or a polyurethane modified polyisocyanurate foam having a mainly closed cell structure and also a method for preparing this foam, the latter comprising closed cells wherein a foam blowing agent consisting of a mixture of 2-chloropropane and one or more HFC compounds including pentafluoropropane, pentafluorobutane, heptafluoropropane, hexafluoropropane or pentafluoroethane are disclosed. Pentanes can be added if desired. Azeotropic mixtures in which 2-chloropropane is an ingredient are disclosed.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of pentane, hexane, methanol, and trans-1,2-dichloroethene.

A binary refrigerating apparatus employs a refrigerant composition that has a small global-warming potential (GWP) to be earth friendly, can be used as a refrigerant capable of achieving a low temperature of −80° C., and is excellent in refrigerating capacity and other performance. A refrigerant composition used as a low-temperature-side refrigerant is a refrigerant mixture including a non-azeotropic mixture in which 20% by mass or less of carbon dioxide (R744) is mixed to difluoroethylene (R1132a). A refrigerant composition used as a high-temperature-side refrigerant is a combination of: a non-azeotropic mixture comprising the refrigerant group of difluoromethane (R32), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a) and 1,1,3-trifluoro ethane (R143a); and 1,1,1,2,3-pentafluoropentene (HFO-1234ze), having a global-warming potential (GWP) of 1500 or less.

Foam-forming compositions containing azeotropic or azeotrope-like mixtures containing cis-1,1,1,4,4,4-hexafluoro-2-butene are disclosed. The foam-forming composition contains (a) an azeotropic or azeotrope-like mixture of cis-1,1,1,4,4,4-hexafluoro-2-butene with methyl formate, 1,1,1,3,3-pentafluorobutane, trans-1,2-dichloroethylene, pentane, isopentane, cyclopentane, HFC-245fa, or dimethoxymethane; and (b) an active hydrogen-containing compound having two or more active hydrogens. Also disclosed is a closed-cell polyurethane or polyisocyanurate polymer foam prepared from reaction of an effective amount of the foam-forming composition with a suitable polyisocyanate. Also disclosed is a process for producing a closed-cell polyurethane or polyisocyanurate polymer foam by reacting an effective amount of the foam-forming composition with a suitable polyisocyanate.

The present invention provides A method for charging a refrigerant blend, when using as a refrigerant a non-azeotropic blend whose permissible range falls within 22 to 24% of difluoromethane, 23 to 27% of pentafluoroethane and 50 to 54% of 1,1,1,2-tetrafluoroethane, comprising adjusting a composition of non-azeotropic blend in a feeding container to the level of 23.5 to 24.0% of difluoromethane, 25.5 to 26.0% of pentafluoroethane and 50.0 to 51.0% of 1,1,1,2-tetrafluoroethane, discharging and transferring the non-azeotropic blend from the feeding container in liquid phase into another container in which a refrigerant is used so as to allow the composition change associated with the transfer to fall within the permissible range; and a method for producing a vapor compression refrigerating equipment.

Provided are azeotropic or azeotrope-like mixtures of 2,3,3,3-tetrafluoropropene (1234yf) and 3,3,3-trifluoropropene (1243zf), as well as methods for producing and using the same.

The invention discloses a process for producing furfural by bagasse, which comprises the following steps of: after drying and stirring acid into bagasse used as a raw material, delivering the bagasse into a spherical boiler for hydrolyzing for two hours so as to form an aldehyde steam stock solution; then delivering the obtained aldehyde steam stock solution into a primary distillation tower for distilling over most of water; after condensing an aldehyde water azeotropy mixture, delivering the aldehyde water azeotropy mixture into an aldehyde separating tank for delaminating; delivering rough furfural into a water scrubber for washing most acetic acid and methanol out of the rough furfural; and then refining in a rectifying tower to obtain finished product furfural; processing wastewater separated by the water scrubber by using a light component removing tower for recycling methanol; and after separating aldehyde steam in the furfural residues separated by the spherical boiler through a furfural residue steam-residue separator, adding cellulase into the furfural residues for fermenting to obtain acetone and butanol. The furfural is extracted from bagasse left after sugar production, and the cellulose left after furfural production is added into the furfural residues for fermenting to obtain the acetone and the butanol, thereby achieving the aims of clean co-production and comprehensive utilization. By adopting the self-made spherical boiler instead of the traditional hydrolysis kettle, the invention solves the problem of difficult residue discharge.

Process for producing a nitric acid of a concentration from 75 to 99.9% from a more diluted nitric acid, wherein a nitric acid of a concentration of about 45 to 70% is rectified in contact with a liquid extraction medium to prevent the formation of a nitric acid-water-azeotropic mixture, and the vapors of the concentrated nitric acid are condensed and a concentrated nitric acid is obtained and wherein additionally the extraction medium is reconstituted through reconcentration and returned into the extractive rectification, wherein the nitric acid to be concentrated is fed as a boiling liquid or partially vaporized to the extractive rectification preferably carried out in two columns (K 1.0, K 1.1), by utilizing the amounts of heat available to the entire process (W1, W2, W5), wherein, before feeding into the extractive rectification nitric acid is added to the extraction medium, and the energy required for the extractive rectification is supplied through indirect heating (W4, W8) and the extraction medium supplied in most concentrated form to the extractive rectification, so that simultaneously at the greatest possible dilution of the extraction medium flowing from the extractive rectification, the circulation amount of extraction medium is minimized and the utilization of energy maximized.

Separation of methylacrolein in methyl methacrylate production is carried out by reacting to obtain mixed gas containing MAL, cooling and absorbing for MAL by 0~60 degrees C water, azeotropic rectifying with methanol as azeotropic agent, and separating MAL from mixed gas to obtain azeotropic mixture of MAL and methanol with water content lower 500pp. It is simple.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of a C1-C3 alcohol, a C5-C6 hydrocarbon, a halogenated hydrocarbon, methylal, methyl acetone, water, nitromethane, and combinations thereof.

The invention relates to an environment-friendly mixed refrigerant for an air conditioner. The refrigerant comprises the following compositions according to mass percentage: 10 to 40 percent of dimethyl ether, 55 to 85 percent of propylene and 5 to 35 percent of 1, 1, 1, 2, 3, 3, 3-heptafluoropropane. The refrigerant has superior environmental performance; the value of ODP is zero; the value of GWP is far less than R22 and R407C; under the conditions of standard working condition and variable working condition; the refrigerating capacity of the refrigerant in unit volume is equal to the COP value and R22, which is quite suitable for direct charging and filling by a compressor; the slipping temperature of the refrigerant is only 0.42 DEG C which is far less than R407C and is close to the temperature of an approximate azeotrope, thereby removing the adverse influence caused by the large slipping temperature; and the air exhaust temperature of the refrigerant is the lowest and is favorable for protecting the refrigeration compressor. The environment-friendly mixed refrigerant can be used as a perfect refrigerant for substituting R22 in the domestic air conditioner.

A non-azeotropic hydrocarbon mixture automatic overlapping refrigerating cycle system for a double-temperature refrigerator comprises a compressor, the compressor, a condenser, a dry filter, a first heat returning device, a first capillary tube and a refrigerating chamber evaporator are sequentially connected, an outlet of the refrigerating chamber evaporator is connected with an inlet of a gas-liquid separator, an outlet of the gas-liquid separator is divided into two paths, a saturation liquid state cooling agent in one path passes a second capillary tube to be connected with a cooling fluid inlet of a condensation evaporator, a saturation liquid state cooling agent in the other path is connected to a hot fluid inlet of the condensation evaporator, a hot liquid outlet of the condensation evaporator passes a second heat returning device and a third capillary tube to be connected with an inlet of a freezing chamber evaporator, and an outlet of the freezing chamber evaporator passes the second heat returning device to be connected with a cold fluid outlet of the condensation evaporator and then passes the first heat returning device to be connected with an inlet of the compressor. The performance of the refrigerating cycle system of the double-temperature refrigerator is effectively improved by utilizing the temperature glide and the achievable automatic overlapping cycle characteristic of the non-azeotropic mixture cooling agent, and the development of the energy-saving technology of household refrigerator products is promoted.

The invention discloses a method for purifying by-product methyl acetate generated during production of PVA (polyvinyl acetate). The method comprises the three unit processes: extractive distillation, purification and drying. The extractive distillation process is that an azeotropic mixture of by-product crude methyl acetate, methanol and water is added from the middle lower part of an extractive distillation column, an extracting agent is added from the upper part of the extractive distillation column, the temperature at the top of the extractive distillation column is controlled to 55 to 65 DEG C; and the azeotropic mixture of methyl acetate and methanol as well as the extracting agent is discharged from the top of the extractive distillation column; and the purification process is that the azeotropic mixture of methyl acetate and methanol as well as the extracting agent, which is discharged from the top of the extractive distillation column, is sent to a purification column for purification, and pure methyl acetate is obtained in a column bottom, and dried to obtain finished methyl acetate. The extracting agent is acetic acid or acetic acid aqueous solution, does not bring new substances to a system, and can be recycled; and methyl acetate with the purity of more than 99.5% and the yield of more than 90% can be obtained under the condition of smaller additive amount of azeotropic mixture of by-product crude methyl acetate, methanol and water as well as the extracting agent.

The present invention relates, in part, to azeotrope and azeotrope-like mixtures consisting essentially of consisting essentially of cis-1-chloro-3,3,3-trifluoropropene and a second component selected from the group water, hexane, HFC-365mfc, and perfluoro(2-methyl-3-pentanone).

A process for determining the distillation characteristics of a liquid petroleum product that contains an azeotropic mixture of an oxygenated or nitrogen-containing component and at least one petroleum blending component.

A process for separating and recovering bifluoro-chloromethane-hexafluoropropene azeotrope includes such steps as passing said gas-state mixed azeotrope through gas separating membrane to obtain penetrated bifluoro-chloromethane gas and residual hexafluoropropene gas, condensing the residual gas, rectifying to obtain pure hexafluoropropene, recovering the mixed azeotrope from tower top, returning it along with said penetrated gas back to rectifying system in tetrafluoro ethene production apparatus, and rectifying separation to recover bifluoro-chloromethane.

The invention disclosed relates to the production of alcohols. A first aspect of the invention relates to a process for production of alcohols, and in particular to a process for the catalytic hydration of an olefin to the corresponding alcohol in substantially anhydrous form, under selected mild reaction conditions, and using a selected catalyst. A second aspect of the invention relates to a process for dehydration of an azeotropic mixture, including a first alcohol and water. A hydration reaction between the water in the azeotropic mixture and an added olefin, under selected mild conditions, and using a selected catalyst, produces a product including a second alcohol corresponding to the olefin, and the first alcohol, in substantially anhydrous form.