4results about How to "Effective desorption" patented technology

A method for strengthening methane in-situ combustion fracturing, liquid carbon dioxide is pressurized and heated to form supercritical carbon dioxide, which is then sent into the fracturing channel to form a complex fracture network around the fracturing channel; mixed fracturing fluid formed by mixing supercritical carbon dioxide and fly ash is injected into the well bottom; combustion-supporting agent is injected into the wellbore and mixed with the mixed fracturing fluid at the well bottom to enter the complex fracture network together, so that a multiphase mixed fluid is formed in the complex fracture network; the annulus valve is closed to promote mineralization reaction of supercritical carbon dioxide and fly ash under the temperature and pressure conditions of the reservoir, and to form high-strength minerals; the mineralization reaction is used to promote the desorption of methane in the reservoir and into the complex fracture network, so that methane-combustion-supporting agent mixed gas is formed in the complex fracture network; the combustion process is used to promote the dust cloud formed by the mixing of fly ash and gas in the complex fracture network, to strengthen the effect of methane in-situ combustion; and the fracturing reconstruction of all layers is completed. The fracturing effect of the method is ideal.

The invention discloses a rapid extraction and detection method for phosphorus form in water, and particularly relates to the field of analytical chemistry. The method comprises the steps of preparation of a solid-phase extraction column, solid-phase extraction of water-soluble phosphorus, back extraction and purification of extract liquor. The solid-phase extraction column filler disclosed by the invention adopts the lanthanum-zirconium-aluminum-based composite adsorbent, so that the solid-phase extraction column filler is large in adsorption capacity and high in rate, and has a relatively good adsorption effect on inorganic phosphorus and organic phosphorus; an iron-manganese-based adsorbent is not used as a solid-phase extraction column filler, so that the influence of paramagnetic substances such as iron and manganese in an extraction solution on nuclear magnetic resonance is greatly reduced, and the resolution ratio is improved; compared with a method for freeze-drying a large-volume water sample, the solid-phase extraction method for determining the form of the water-soluble phosphorus has the advantages of simplicity, convenience and large-scale determination.

The application discloses a kind of multilayer biomass cellulose adsorption materials and its preparation method and application, belong to biomass material and sewage treatment technical field.The application first obtains PEI-cellulose by polyethyleneimine modification to biomass cellulose;Then PEI-cellulose and chitosan are crosslinked to prepare surface layer adsorption liquid;While unmodified biomass cellulose and polyvinyl alcohol are mixed to prepare middle layer adsorption liquid;Finally, by layer liquid nitrogen freeze forming, freeze drying and alkali washing treatment, obtain the biomass cellulose adsorption material with sandwich multilayer structure.The multilayer adsorption material prepared by the application has positive electricity on outer layer, can be efficiently adsorbed by electrostatic effect in water with negative electricity micro / nano plastic;Middle layer is neutral, can be used to adsorb organic pollutants carried by micro / nano plastic.The material of the application is low in cost, simple in preparation process, fast in adsorption rate, high in removal rate and reusable, and has good application prospect in water treatment field.

The invention discloses a preparation method of a hydrogen-bonded organic framework-sulfur composite material and its application in a lithium-sulfur battery, which is prepared by reacting and compounding a hydrogen-bonded organic framework material (HOFs), sublimated sulfur powder and a conductive material under certain temperature conditions. The preparation method of the invention has the characteristics of low equipment requirements and low cost consumption. The obtained composite material contains abundant hydrogen bonds, and there is a bonding effect between the hydrogen-bonded organic framework material and sulfur. These hydrogen bonds and sulfur-containing chemical bonds can effectively absorb and desorb lithium polysulfide, improve the lithium storage activity and capacity stability of the electrode, so when it is used as a positive electrode material for a lithium-sulfur battery, the initial capacity can be as high as 1000mAh / g, and it shows good cycle life and capacity retention rate, and has good application potential.