36results about How to "Regulatory selectivity" patented technology

The invention discloses application of dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer, and relates to application of the dual-fluorophore ratio fluorescence molecular probe. The dual-fluorophore ratio fluorescence molecular probe disclosed by the invention is designed for solving the technical problems that due to energy loss caused by energy transfer between double fluorophores when the existing dual-fluorophore ratio fluorescence molecular probes are excited, the probes are poor in fluorescence, and not high in metal ion selectivity and sensitivity. The dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer is used for identifying fluorescence peak quenching of Cu2+, Cu2+ to the dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer at the position of 474nm, while the fluorescence peak strength at the wavelength of 351nm basically remains unchanged. The dual-fluorophore ratio fluorescence molecular probe disclosed by the invention can be applied to the fluorescence imaging detection of metal ions in biological tissue and cell microenvironments.

The invention discloses a method for preparing a polyimide film with a dinaphthalene structure and application. The polyimide film is used for O2 / N2 and CO2 / N2 separation, and the polyimide resin filmis synthesized by dianhydride and naphthidine monomers with different lateral functional groups. The polyimide film has advantages of high gas permeability and high selectivity; under operating pressure of 0.8MPa, O2 transmission coefficient exceeds 300barrer, and CO2 transmission coefficient exceeds 800barrer; nitrogen transmission coefficient is lower than 25barrer; O2 / N2 selectivity coefficient exceeds 13, and CO2 / N2 selectivity coefficient exceeds 68. The polyimide film is excellent in heat resistance (exceeding 50 DEG C) and mechanical performance.

The invention relates to a method for removing residual oxygen in a product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation, wherein the method comprises the following steps: (1) feeding mixed raw material gas into an oxidative dehydrogenation reactor for reaction, carrying out waste heat recovery and cooling on the obtained crude product gas, and then feeding the crudeproduct gas into a gas-liquid separation tank for gas-liquid separation; (2) cooling a gas phase at the top in the gas-liquid separation tank, feeding the cooled gas phase into an absorption tower, and obtaining deacidified gas from the top of the absorption tower under the action of a tower top absorbent; and (3) feeding the obtained deacidified gas into a deaerator, and deoxidizing to obtain a deoxidized crude product. Compared with the prior art, the treatment capacity of the deaerator can be effectively reduced, the equipment investment is reduced, and meanwhile, the improvement of the deaeration reaction depth is facilitated. Besides, part of process condensate is injected into the mixed feed gas flow, and the reaction waste heat is gasified and recycled, so that the reaction temperature rise can be effectively controlled, and more reaction waste heat can be recycled.

The invention discloses a method for synthesizing a polysubstituted aminoisoquinoline compound by cyclizing pyridine and alkyne under the catalysis of rhodium, which comprises the following steps: byusing a pentamethylcyclopentadienyl rhodium complex as a catalyst and a 2-aminopyridine derivative and an internal alkyne compound as raw materials, reacting in an organic solvent at 30-150 DEG C for1-24 hours, cooling the reaction solution after the reaction is finished, removing the organic solvent under reduced pressure; purifying the crude product through a silicon dioxide column, and elutingwith petroleum ether / ethyl acetate to obtain the pure polysubstituted aminoisoquinoline derivative. According to the method, a guide group (carbonyl) or a steric hindrance group (methyl) is introduced into the reaction to realize C-H bond activation and avoid the coordination effect of pyridine on the metal catalyst, and the regulation and control of the reaction activity and selectivity are efficiently realized through the regulation and control of the group with large steric hindrance. The obtained generation target products are high in selectivity, and the selectivity is 90% or above, byproducts are few, and the product separation cost is reduced, and the method is simple in synthesis process, mild in reaction condition and convenient for industrial production.

The invention discloses a preparation method of fischer-tropsch synthesis catalyst with a biological additive effect and aims at solving the problems that traditional fischer-tropsch synthesized iron-base catalyst generally needs one or several metal additives, a preparation process is complex, and is not environmental-friendly. The preparation method disclosed by the invention is a simple and green preparation path by extracting varieties of beneficial microelements of K, Mg, Si, Mn and the like from biomass as catalyst promoters to prepare high-efficiency fischer-tropsch synthesis catalyst. By means of introducing the multi-component concomitant biological additive effect, hydrocarbon selectivity and CO conversion rate are enhanced. The preparation method can provide a full novel idea for recycling waste biomass resources and achieving green synthesis processes.

The invention relates to a hydrodehalogenation catalyst, and aims to provide a method for catalyzing hydrodehalogenation of a heterocyclic halogen-containing organic matter by using a supported metaloxide. The method comprises the following steps: uniformly mixing a solvent, a heterocyclic halogen-containing organic matter, a neutralizer and a catalyst material; introducing hydrogen into a reaction container until the pressure is 0.1 to 3.0 MPa; reacting at a controlled temperature of 25-180 DEG C for 0.1-24 h; and carrying out catalytic dehalogenation in the reaction process to finally obtain a dehalogenated heterocyclic compound. The method can effectively regulate the selectivity of the product in the dehalogenation process of the heterocyclic halogen-containing organic matter, and effectively regulate the adsorption of pyridine, thiophene and other organic molecules on the surface of the catalytic material by regulating the chemical coordination environment of the metal components, thereby efficiently preparing important compounds in the chemical and agricultural processes. In the dehalogenation process, the catalytic material is stable and can be recycled, no toxic or harmfulbyproduct is generated in the whole reaction process, and the method is green and environmentally friendly and has a high industrial application prospect.

The invention relates to the synthesis of N-acyl-8-aminoquinoline derivatives and application thereof as fluorescent molecular probes. The invention takes 8-aminoquinoline as a matrix, can introduce substitutional groups at position 2, 4 and 5 of the quinoline matrix, and can acylate on an amino group to synthesize a series of novel acylaminoquinoline derivatives. The compounds with relatively simple structures and easy synthesis can be used for fluorescence detection of transition and heavy metal ions in solutions, show high sensitivity and selectivity, and are successfully applied to the fluorescence imaging detection of zinc ions in living cells. The compounds are expected to be widely applied in the fields such as analytical inspection of transition metal and heavy metal ions and the catalysis of metal complexes in biological tissues, cells, environment, medicine, and industrial and agricultural production and so on.

The invention discloses a dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer and a preparation method thereof, which relates to a dual-fluorophore ratio fluorescence molecular probe and a preparation method thereof. The dual-fluorophore ratio fluorescence molecular probe and the preparation method thereof disclosed by the invention are designed for solving the technical problems that due to energy loss caused by energy transfer between double fluorophores when the existing dual-fluorophore ratio fluorescence molecular probes are excited, the probes are poor in fluorescence, and not high in metal ion selectivity and sensitivity. The structure formula of the dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer is shown in the specification. The preparation method of the dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer comprises the steps of 1, preparing an intermediate; and 2, preparing the dual-fluorophore ratio fluorescence molecular probe for non-fluorescence resonance energy transfer. The dual-fluorophore ratio fluorescence molecular probe disclosed by the invention can be applied to the fluorescence imaging detection of metal ions in biological tissue and cell microenvironments.

The invention relates to a control method and a control device for the moisture content of furfural in the extraction of the furfural and a method for preparing aromatic rubber oil. The method for preparing the aromatic rubber oil comprises the following steps of: mixing a part of furfural from a furfural drying tower with raw oil and enabling the mixture to enter the lower part of an extracting tower; mixing the other part of furfural from the furfural drying tower with water and enabling the mixture to enter the upper part of the extracting tower; carrying out counter-current contact on the two parts of materials in the extracting tower; and separating raffinate from overhead raffinate. By adopting the control method provided by the invention, the moisture content of the furfural entering the upper part of the extracting tower is controlled between more than 0.5 weight percent and 10 weight percent; and the raw oil is solvent refining extract oil or dewaxed oil of the solvent refining extract oil. The aromatic rubber oil prepared by adopting the method has high yield, the prepared aromatic rubber oil satisfies the directive requirements of European Union 2005 / 69 / EC, and the mass percent of polycyclic aromatic hydrocarbon is less than 3 percent.

The invention relates to the technical field of Fischer-Tropsch synthetic catalyst preparation, and specially provides a nanoscale cobalt particle Fischer-Tropsch synthetic catalyst allowing flexible adjustment on a catalyst load capacity, nanoscale cobalt particle sizes and carrier types, and a preparation method thereof. The preparation method comprises preparing nanoscale cobalt particles intoa colloidal solution with appropriate concentration, immersing carriers into the colloidal solution, and mixing uniformly the nanoscale cobalt particles and the carriers in nanoscale by effects of ultrasound to realize interaction between the nanoscale cobalt particles and the carriers. The nanoscale cobalt particle Fischer-Tropsch synthetic catalyst prepared by the preparation method can load selectively with active metal particles having different sizes through different carriers, and thus selective adjustment on products is realized. Through adjustment produced by interaction between active metal and carriers, dispersity and reductibility of the nanoscale cobalt particle Fischer-Tropsch synthetic catalyst are improved simultaneously. Therefore, selective adjustment and high activity and stability of the nanoscale cobalt particle Fischer-Tropsch synthetic catalyst are realized simultaneously.

The present invention provides a method for producing an N-acetyl dipeptide and an N-acetyl amino acid, comprising the step of reacting an amino acid with acetic anhydride or acetyl chloride to form an N-acetyl dipeptide and an N-acetyl amino acid.

The invention provides a system for Fischer-Tropsch synthesis, and a method for preparing low-carbon olefins from synthetic gas. The system for Fischer-Tropsch synthesis includes a fluidized bed reactor cylindrical shell, a gas-solid separator, a heat exchanger and a catalyst delivery tube; a product outlet is arranged at the top of the fluidized bed reactor cylindrical shell, and the product outlet is connected with the gas-solid separator; the gas-solid separator is provided with a solid product outlet, the solid product outlet is connected with one end of the catalyst delivery tube, and theother end of the catalyst delivery tube is connected with the bottom of the fluidized bed reactor cylindrical shell; and the heat exchanger is used to exchange heat with the delivery tube, and the heat exchanger and the delivery tube are arranged outside the fluidized bed reactor cylindrical shell. The system timely removes the reaction heat of a reactor, avoids the problems of abrasion of a catalyst and easy destruction of devices during heat removal, and recycles the removed heat.

The invention relates to a catalyst for hydrogenation dehalogenation, and aims to provide a method for selective dehalogenation of aromatic halogen-containing organic substances catalyzed by supported metal oxides. Including: adding organic solvents, aromatic halogen-containing organic substances, neutralizers and catalyst materials into a sealable reaction vessel, and mixing them uniformly; filling hydrogen until the pressure is 0.1-3.0MPa, controlling the reaction temperature from 25°C to 180°C, The reaction time is 0.1 to 24 hours; during the reaction process, the catalytic dehalogenation is realized by the catalyst, and finally the dehalogenated organic matter is obtained. The invention can effectively control the selectivity of products in the dehalogenation process of aromatic halogen-containing organic substances, and can still efficiently dehalogenate even when the halogen-containing organic substances contain two or more functional groups that can be reduced, thereby efficiently preparing chemical and Important compounds in agricultural processes. In the dehalogenation process, the catalytic material is stable and can be recycled, and no toxic and harmful by-products are produced in the whole reaction process, which is green and environmentally friendly, and has industrial application prospects.

The invention discloses a method for preparing methanol and dimethyl ether by using catalytic hydrolysis of methyl bromide in the presence of ZnO-SiO2-gamma-Al2O3. A catalytic hydrolysis reaction is carried out between methyl bromide and ZnO-SiO2-gamma-Al2O3 under normal pressure, wherein the amount of the catalyst is 3-10g; the reaction temperature is 100 to 260 DEG C; the molar ratio of H2O to CH3Br is 0.5-4; and the concentration CH3Br / N2 of methyl bromide is 0.5-1.2. The method has the advantages of low reaction temperature, low energy consumption and high conversion rate, the selectivity of the methanol and dimethyl ether can be adjusted by changing the reaction conditions, carbon dioxide is not produced, and the method is suitable for large-scale industrial production.