217 results about "Separation factor" patented technology

This invention comprises an adsorption process for the removal of at least N2O from a feed gas stream that also contains nitrogen and possibly CO2 and water. In the process the feed stream is passed over adsorbents to remove impurities such as CO2 and water, then over an additional adsorbent having a high N2O / N2 separation factor. In a preferred mode the invention is an air prepurification process for the removal of impurities from air prior to cryogenic separation of air. An apparatus for operating the process is also disclosed.

The present invention relates to copolymer compositions for alcohol-selective membranes and methods of selectively separating an alcohol such as ethanol from an aqueous solution using such membranes. The copolymer compositions may be block copolymers of polystyrene-polybutadiene-polystyrene (hereafter “SBS”) having cylindrical morphologies; graft diblock copolymers synthesized by ring-opening metathesis polymerization of two cycloalkene monomers, wherein at least one of the cycloalkene monomers is substituted with one or more polydialkylsiloxane groups; or triblock copolymers comprising a middle block comprising a polymerized cycloalkene monomer and two end groups. The synthesized graft and triblock copolymer compositions may have a spherical, lamellar, cylindrical, double diamond, or gyroid morphologies. The copolymer compositions may contain a structural block that imparts essential mechanical properties to the membrane (e.g., polystyrene) and may also contain an alcohol transporting block (e.g., polydimethylsiloxane or polybutadiene). The copolymer compositions may have a domain spacing and a flux, where the flux increases as the domain spacing increases. The copolymer compositions may also have an alcohol separation factor that increases as the domain spacing increases. The separation method may be carried out using pervaporation or vapor permeation techniques.

By using a dephlegmator which conducts distillation concurrently with heat exchange within at least one distillation column, or a portion of one distillation column, of a distillation cascade, the quantity of liquid holdup within the distillation apparatus is reduced and the start-up time is shortened. Consequently, the operational costs associated with startup are reduced, and productivity is improved markedly.

The invention relates to a technological method of full load fractional extracting and separating rare earths. According to the technological method disclosed by the invention, P507 or P204 serves as a rare earth extractant; in a fractional extraction separation technology, N235 serves as an acid extraction agent, and a mixed alcohol serves as an acid extraction segment of an N235 organic phase regulator; an easily-extracted rare earth component solution with a pH value to be 1-4 serves as a washing solution; by virtue of the acid extraction action of the N235 in the acid extraction segment, the side effects of hydrogen ion washing are eliminated, so that the separation factor of the rare earths is ensured not to be lowered, and the extraction quantity of the extractant in a fractional extraction system is also ensured. Compared with the traditional fractional extraction separation technology, the acid and alkali consumption in the process of the rare earth separation technology can be greatly lowered, wherein the consumption of a basic reagent is lowered by 34-62 percent, and the consumption of hydrochloride is lowered by 16-29 percent; the waste water discharge in the process of the rare earth extraction separation technology is greatly reduced, the greening degree of rare earth separation is greatly increased; the grade amount of extraction tank is reduced by 22-46 percent, the total investment of the rare earth extraction separation technology is lowered; the separation cost is greatly lowered.

The invention provides a method for preparing a high-performance Y-type molecular sieve membrane and an application to the separation of organic mixture. The method is characterized in that a new high-temperature closed hydro-thermal synthesis reaction method is adopted, a layer of dense NaY-type molecular sieve membrane forms on the surfaces of three porous tubular support body. The synthetic time of preparation process is short, and the process of the membrane forming is simple. The membrane prepared by the method has fewer defects, the synthesized NaY-type molecular sieve membrane is used in the separation of organic mixtures by adopting a self-control permeating and vaporizing device, the process of the separation is simple and is easy to be operated and controlled, the separating property is good, the Y-type molecular sieve membrane has high permeation flux and high separation factor while the Y-type molecular sieve membrane is applied to methanol / methyl tert-butyl ether, ethanol / ethyl tertiary butyl ether and benzene / cyclohexane, the NaY-type molecular sieve membrane particularly synthesized by stainless steel support body has extremely high permeation flux.