47results about How to "Highly selective separation" patented technology

A method of separating, concentrating or purifying uniform carbon nanotubes with desired properties (diameter, chiral vector, etc) in a highly sensitive manner by the use of structure-sensitive properties peculiar to carbon nanotubes; and an apparatus therefor. There is provided a method of separating, concentrating, or purifying carbon nanotubes with the desired properties contained in a sample, comprising the steps pf (a) irradiating a sample containing carbon nanotubes with light; and (b) selecting carbon nanotubes with desired properties. In a preferred embodiment, the light irradiation of the step (a) can be carried out in the presence of a metal so as to cause specified carbon nanotubes to selectively induce a photocatalytic reaction, resulting in metal deposition. Further, in a preferred embodiment, a given magnetic filed can be applied in the steps (b) so as to attain accumulation or concentration or carbon nanotubes with metal deposited.

The invention discloses a method for separating precious metal palladium through selective adsorption from palladium-containing waste liquid by using double-arm bonding-type alicyclic crownether silicon resin, and belongs to the technical field of heavy metal ion separation. The method comprises the following steps: firstly adding double-arm bonding-type alicyclic crownether silicon resin into palladium-containing waste liquid according to a ratio of 0.01-1.0 of the weight of the double-arm bonding-type alicyclic crownether silicon resin to the volume of the palladium-containing waste liquid, then stirring or oscillating at a temperature of 5-50 DEG C for 20-300 min; filtering and separating the solid phase from the liquid phase, determining the residual concentration of palladium ions in the liquid phase, comparing with an initial concentration to calculate the separation recovery rate; eluting the double-arm bonding-type alicyclic crownether silicon resin with a nitric acid solution of 0.01-3 mol / L, repeatedly washing with deionized water, drying to obtain regenerated resin. The method provided by the invention is high in separation speed for palladium ions in the palladium-containing waste liquid, high in separation efficiency, strong in adaptability, recyclable in materials, and low in cost.

The invention discloses a method for separating iridium and platinum through polystyrene-4-methylthiazole sulfoxide resin, and belongs to the technical field of platinum group metal separation. The method comprises the steps that the polystyrene-4-methylthiazole sulfoxide resin (PS-4-MTS for short) is used as an adsorbent, Ir(IV) in a 0.1-0.5 mol / L hydrochloric acid medium is adsorbed according to the solid-liquid ratio of 1:50(g / mL), the PS-4-MTS adsorbs Ir in an Ir and Pt mixed solution, Pt is reserved in a water phase, and Ir on the resin is desorbed through an 0.5%-1% NaOH solution. Ir and Pt are separated through the adsorbability difference of the PS-4-MTS adsorbent for Ir and Pt, the operation process is simple and environmentally friendly, the Ir and Pt separation coefficient is high, and the PS-4-MTS adsorbent is good in stability and capable of being reused.

The invention discloses a method for converting carbon-4 olefin into propylene through a catalytic cracking or pyrolysis process. The technical method comprises the following steps: (1) directly putting the etherified carbon-4 into a reactor, and performing hydration reaction with water to generate a corresponding alcohol; (2) performing regular distillation on the reactor outlet material to obtain the alkane on the tower top and the corresponding alcohol on the tower bottom; and (3) taking the tower bottom material as the raw material for cracking and increasing the propylene, and reentering to a catalytic cracking riser reactor to perform cleavage reaction. A mass separating agent (water) which does not influence the consequent reaction without separation is added, the alkane and the olefin separation process is reinforced, the olefin component with high reactivity is high selectively reprocessed under the condition without separating the mass separating agent. The problem of efficient separation of the alkane and the olefin in the traditional process is solved and the target of increasing the yield of the propylene is realized through reprocessing. The original device is utilized and the utilization rate of the olefin is increased under the condition of low investment.

The invention belongs to the field of mineral flotation, and specifically discloses a selective collector p-Ph-SO used for galena-pyrite flotation separation 2 ‑ application of compounds. The flotation agent of the invention can preferentially flotate galena in the galena-pyrite mixed sulfide ore flotation system, and can realize the high efficiency of galena and other sulfide minerals such as pyrite under environmental protection and green conditions. Separation can efficiently obtain high-grade galena concentrate products and pyrite tailings products at the same time. The near-neutral flotation environment has little impact on the environment, and the cost of subsequent beneficiation wastewater treatment is significantly reduced. Potential economic benefits, and in line with the concept of green mines.