摘要:
Impurities such as sulfur dioxide (SO2) are removed from trifluoroacetyl chloride (TFAC) through distillation, adsorption, or a combination thereof, and/or including the formation of an azeotrope or azeotrope-like composition including effective amounts of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC). The trifluoroacetyl chloride (TFAC) thus purified may then be used in the manufacture of trifluoroiodomethane (CF3l). Also disclosed are azeotropes and azeotrope like compositions of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC).
摘要:
Process for the purification of the solvent deriving from the production of an elastomeric blend comprising the following steps: • (a) optionally, subjecting said solvent to a pre-washing (2) in the presence of at least one acid or basic aqueous solution; • (b) feeding said solvent to a liquid-liquid separation column (7); • (c) feeding the stream leaving the head of said liquid-liquid separation column (7) to an azeotropic distillation column (21); • (d) feeding the stream withdrawn laterally (side-withdrawal) from said azeotropic distillation column (21) to an adsorption section (34a/b); Said process allows to obtain a polymer grade solvent having a quality suitable for being used indifferently and contemporaneously in various types of production plants of elastomeric (co)polymers, i.e. in plants wherein an anionic (co)polymerization is carried out, and also in plants wherein a Ziegler-Natta (co)polymerization is carried out.
摘要:
La presente invención se encuentra relacionada con un método para la separación de mezclas azeotrópicas de al menos dos componentes, mediante la utilización de nanopartículas o nanoestructuras de cerámica. Dichas partículas alteran la distribución de equilibrio del sistema, desplazando el punto azeotrópico y reduciendo las temperaturas de evaporación de la mezcla. El método comprende las etapas de: seleccionar las nanopartículas o nanoestructuras de óxido metálico de acuerdo con su compatibilidad con la mezcla química azeotrópica a ser separada; dispersar las nanopartículas o nanoestructuras de óxido metálico en la mezcla química azeotrópica; adicionar la dispersión a una cámara de separación; separar la mezcla química, obteniendo una corriente de vapor que comprende los productos más volátiles y una corriente líquida que comprende las especies menos volátiles junto con las partículas de óxido metálico; y alternativamente alimentar la corriente líquida a procesos de recuperación de partículas.
摘要:
The present invention provides a tetrahydrofuran purge stream treatment process, and a process for manufacturing polyether glycol comprising same. The process for treating a tetrahydrofuran stream purged from a polyether glycol manufacturing process comprises steps of neutralizing acidic substances in a tetrahydrofuran stream purged from the polyether glycol manufacturing process with an aqueous base solution, feeding the neutralized effluent to an azeotropic distillation column, and distilling tetrahydrofuran and water overhead from the azeotropic distillation column. The process can further comprise a step of disposing of the neutralized salts and excess base in the aqueous bottoms stream from the azeotropic distillation column. The process can further comprise steps of recovering THF from the overhead of the azeotropic distillation column, and recycling the recovered THF to a polyether glycol manufacturing process.
摘要:
The present invention relates to a method for recovering acetic acid from reactor discharge gas in the oxidation process of an aromatic compound. Particularly, when the oxidation process of an aromatic compound is performed, gas discharged from a reactor passes through a general vacuum-distillation tower, an extraction tower, and an azeotropic distillation tower, or an extraction tower and a vacuum azeotropic distillation tower, so as to recover acetic acid and remove water. Thus, low-temperature steam may be used by a vacuum-distillation process, replacing a conventional dehydration tower. Also, when compared to well-known azeotropic distillation processes, the amount of medium steam which is used for separating the water and the acetic acid from each other may be significantly reduced.
摘要:
Disclosed are azeotropic and azeotrope-like mixtures of (Z)-1-chloro-3,3,3-trifluoropropene (1233zd(Z)) and hydrogen fluoride. Such compositions are useful as an intermediate in the production of 1233zd(Z). The latter compound is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent, aerosol propellant, heat transfer medium, dielectric, fire extinguishing composition and power cycle working fluid.
摘要:
The invention provides a method for separating halocarbons. In particular, a method for separating 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) from 2-chloro-3,3,3-trifluoropropene (HCFC-1233xf) by adding a third component and then separating via conventional distillation. More particularly the invention pertains to a method for separating HCFC-244bb from HCFC-1233xf which are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).
摘要:
A process for converting multihydroxylated- aliphatic hydrocarbon compound(s) and/or ester(s) thereof to chlorohydrins and/or esters thereof is disclosed in which one or more of multihydroxylated- aliphatic hydrocarbon compound(s) and/or ester(s) thereof and/or monochlorohydrin(s) and/or ester(s) thereof with at least one chlorinating feed stream comprising at least one chlorinating agent and at least one impurity having a boiling point below the boiling point of the chlorohydrin product having the lowest boiling under hydrochlorination conditions, optionally in the presence of water, one or more catalyst(s), and/or one or more heavy byproduct(s) in a reaction vessel under hydrochlorination conditions, wherein the liquid-phase reaction mixture is maintained at a temperature below the boiling point of the chlorohydrin product having the lowest boiling point under hydrochlorination conditions and greater than the boiling point(s) of the at least one impurity and a vapor phase vent stream comprising the at least one impurity is removed from the liquid phase reaction mixture. An apparatus suitable for carrying out the disclosed process is illustrated in Figure 1 of the drawings. The process and apparatus improve conversion rates and/or provide for recovery of chlorinating agent for lower operating costs.
摘要:
The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentachloropropane (HCC-240fa) and carbon tetrachloride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the production of HFC-245fa. The latter is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent and aerosol propellant.