36results about How to "Change chemical composition" patented technology

The invention provides pentaerythritol ester base oil and a synthesis method thereof. The concrete synthesis method comprises the following steps of adding a catalyst A into pentaerythritol serving as a reaction raw material to carry out self-polymerization reaction to generate pentaerythritol rich in a dipolymer; adding fatty acid or arylcarboxylic acid into pentaerythritol rich in the dipolymer to carry out esterification reaction to obtain a crude product; and deacidifying and decolorizing the crude product to obtain the pentaerythritol ester base oil. The dipolymer of pentaerythritol ester and corresponding esters are introduced to a mixture, so that the viscosity and viscosity-temperature characteristics of the base oil are improved, and the condensation point of the base oil is reduced; and the obtained base oil is particularly suitable for the fields of aircraft engine lubricating oil, gear oil and the like.

The invention discloses a method for increasing the wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in a solid state at normal temperature. The method comprises the following steps of: mixing an ammonia-containing solution and anthraquinone, adding water of which the weight is less than 2.5 to 5.5 times the dry weight of the wheat straws into the mixture, and fully mixing the mixture and the crushed wheat straws, wherein the mixed wheat straws are still in a wet solid state; storing the mixture for 4 days in a sealed bag at normal temperature, allowing ammonia which carries the anthraquinone to gradually adhere to the surfaces of the wheat straws because the ammonia has volatility, wherein catalysis-ammoniation reaction is performed; and adding the pre-treated wheat straws, inoculation mud and a proper amount of water into an anaerobic digestion reactor to perform anaerobic digestion, wherein the whole anaerobic digestion process lasts for 25 to 35 days. Results show that the gas yield of the wheat straws pre-treated by the method is obviously increased. When the wheat straws pre-treated by the method are compared with the wheat straws pre-treated by ammoniation through only 2 percent of ammonia, the gas yield of unit TS of the wheat straws which are subjected to catalysis-ammoniation through the anthraquinone is 17 to 56.6 percent higher than that of the wheat straws which are not subjected to catalysis-ammoniation through the anthraquinone, the anaerobic digestion time is shortened by 41.42 percent, and the content of the efficient component methane in the biogas is improved by about 3 to 10 percent, so that the production efficiency of the anaerobic digestion reactor is improved.

The invention discloses a nanozyme, a preparation method and its application, and belongs to the technical field of nanozyme catalysis, and solves the problem that the original graphyne is not used in the field of simulated enzyme catalysis in the prior art, and the catalytic activity of the simulated enzyme of the original graphyne is low. . The material of the nanozyme of the present invention contains graphyne, and the preparation method of the nanozyme comprises: step 1, preparing graphyne oxide; step 2, modifying graphyne oxide to obtain nitrogen-doped graphyne nanozyme or boron-nitrogen doped graphyne nanozyme. The nanozyme of the invention has high catalytic performance and wide application range.

A method for directly repair waste lithium iron phosphate powder to prepare battery-grade lithium iron phosphate by fire method comprise that following steps: A, oxidizing roasting the waste lithium iron phosphate power in the atmosphere of air or oxygen to obtain calcine; B, preparing material, adding lithium source, iron source, phosphorus source, carbon source and activator into that calcine; C, performing ball milling, adding a dispersion medium to carry out high-speed ball mil activation and granulation; D, drying and volatilizing alcohol, and condensing to obtain recycled use; E, sintering: sintering under that protection of an inert gas; F, screenining and performing iron removal, and screening with a vibrating screen with a permanent magnet to obtain battery-grade lithium iron phosphate product. The direct repair method of the invention has the advantages of reasonable process, low production cost, no pollution, no toxicity and the like.

The invention provides a laser remanufacturing method of a power lithium battery for heavy-duty equipment. The laser remanufacturing method of the lithium battery for heavy-duty equipment includes the following steps: S1. Place the damaged lithium battery for heavy-duty equipment in a battery dismantling device, so that the lithium battery casing is separated from the lithium battery body. The invention provides a laser remanufacturing method for power lithium batteries of heavy-duty equipment, which mainly uses laser surface alloying technology and laser cladding technology to respectively repair the bent pole plate and cracked pole plate, and repair the damaged pole plate, Complete the maintenance of the entire lithium battery, try to avoid direct replacement of new plates, make full use of the limited plates, and avoid waste of resources. For manufacturers who are used for many lifting assemblies at the same time, it greatly saves the maintenance of lithium batteries After repairing, a new surface alloy layer based on the original base material is formed, which greatly increases the overall strength of the plate.

The invention discloses application of a tobacco C2H2-type zinc finger protein gene Nt540. A gene fragment with a nucleotide sequence shown as SEQ ID NO.1 is provided. The invention further discloses a recombinant vector comprising the gene fragment, a recombinant strain and application of the recombinant vector and the recombinant strain. Through transfer of the gene Nt540 and the recombinant strain, the tobacco quality is improved effectively, novel materials and novel approaches are provided for tobacco variety improvement, and accordingly such application has a promising application prospect.