16 results about "Methylamine" patented technology

The utility model relates to the technical field of multi-stage pumps, in particular to a single-flow-channel type inner shell structure applied to a hydrogenation feeding pump and an ammonium carbamate pump in the petrochemical industry. One end of a long transition flow channel suction chamber is connected with a short transition flow channel at the tail of a pump driving end, and the other end of the long transition flow channel suction chamber is connected with one end of a long transition flow channel; the other end of the long transition runner is connected with the first short transition runner at the non-driving end of the pump; and the first short transition runner at the non-driving end of the pump is connected with the delivery chamber to jointly form an inner shell runner. The short transition flow channels are arranged on the single side of the driving end or the non-driving end of the pump in a staggered mode step by step. According to the technical scheme, the problems that the manufacturing difficulty and cost of a grinding tool are increased due to a double-flow-channel structure in the prior art are solved; the small runner size is easy to generate casting defects, and the yield is low; and the pump efficiency is low.

This invention relates to the field of polymer materials technology, and discloses a lignin-based adsorbent modified with a methylamine oxime, its preparation method, and its application. The invention uses lignin enzymatically hydrolyzed solid waste from industrial ethanol production as raw material. Utilizing the phenolic hydroxyl activity of lignin, methylamine oxime functional groups are chemically grafted onto the lignin structure to obtain a lignin-based adsorbent modified with a methylamine oxime. This adsorbent has the advantages of strong stability, high adsorption activity, low cost, and recyclability, enabling the high-value utilization of waste enzymatically hydrolyzed lignin. When the above-mentioned lignin-based adsorbent is used in the treatment of highly acidic uranium-containing nuclear wastewater, the uranium adsorption rate can reach up to 99.9%, which is beneficial for the promotion of lignin-based materials in the industrial application of treating highly acidic nuclear wastewater.

The utility model discloses a tail gas absorption tower, which relates to the technical field of tail gas treatment and comprises an absorption tower body, a gas outlet and a gas inlet, the gas outlet and the gas inlet are respectively positioned at the upper end and the lower end of the absorption tower body, and a water washing unit, a methanol washing unit and a dust removal unit are sequentially arranged in the absorption tower body from top to bottom. The dust removal bag is used for separating the filter chamber from the methanol washing unit; and the air inlet is communicated with the filter chamber. According to the utility model, alcohol washing and water washing are integrated in one absorption tower, so that methanol, ammonia, monomethylamine, dimethylamine, trimethylamine and the like generated in the methylamine production process are absorbed, the occupied area of the absorption tower can be reduced, and the tail gas treatment efficiency of the absorption tower is improved.

The invention provides a siloxane primer for bonding rubber and metal for a cable joint as well as a preparation method and application of the siloxane primer. The siloxane primer is prepared from the following components in parts by weight: 10 to 16 parts of trimethoxy silane containing epoxy alkyl, 10 to 16 parts of trimethoxy silane containing aminoalkyl, 3 to 6 parts of a methylamine auxiliary agent, 3 to 8 parts of a phenol auxiliary agent, 3 to 6 parts of a stabilizer and 50 to 65 parts of an organic solvent. Trimethoxysilane containing epoxy alkyl in the primer forms a covalent bond with the metal surface through the epoxy alkyl, and forms a good bonding interface with silicon rubber at the silane group end. Trimethoxy silane containing aminoalkyl is subjected to chemical reaction with hydroxyl or other polar groups on the surface of metal through aminoalkyl, so that the adhesive force of the primer and the metal is enhanced. Therefore, the siloxane primer disclosed by the invention can be used for improving the bonding strength between the silicone rubber and the metal, so that the reliability of a cable joint is improved.

The invention provides a low-energy-consumption urea production process by a CO2 stripping method. A related process device comprises a high-pressure system, a medium-pressure system, a low-pressure system, a micro-positive-pressure system, a vacuum concentration system, an ammonia and carbon dioxide recovery system and the like. Wherein the high-pressure system consists of a urea synthesis tower, a high-pressure washing condensation reactor and a high-pressure COstripping tower; the high-pressure washing and condensing reactor has three functions of condensing high-pressure ammonium carbamate liquid, dehydrating ammonium carbamate to generate urea, and washing ammonia gas and carbon dioxide gas. Decomposition of ammonium carbamate in the urea solution is completed through a heating decomposition process of the medium-pressure decomposition tower and the low-pressure decomposition tower; the moisture of the urea solution is evaporated by adopting processes such as micro-positive pressure flash evaporation, pre-concentration evaporation, concentration evaporation and the like. In the recovery system, processes such as micro-positive pressure flash evaporation condensation absorption, low-pressure washing absorption, low-pressure methylamine condensation absorption, medium-pressure methylamine condensation absorption, medium-pressure washing absorption and high-pressure washing absorption are used for effectively recovering ammonia and carbon dioxide.

The present application relates to an environment-friendly water-based industrial anticorrosive coating and a preparation method thereof, and belongs to the technical field of coating. The coating composition comprises chloroether resin emulsion, corrosion inhibition emulsion, barrier agent, slag composite filler, etc. The corrosion inhibition emulsion is prepared by using hexamethylcyclotrisilazane, glycidyl furfuryl ether and 2-furfurylamine in isopropyl alcohol as raw materials and tetramethylammonium hydroxide as catalyst, and then emulsified with deionized water and composite emulsifier after removing isopropyl alcohol. The barrier agent is prepared by modifying the titanium aluminum carbide sheet layer after acid stripping with 3-aminopropyltriethoxysilane. The slag composite filler is prepared by sintering blast furnace slag powder, zeolite powder and potassium dihydrogen phosphate, etching with citric acid, and then modifying with boron nitride and KH-172 silane coupling agent. The coating uses water as the dispersion medium to reduce VOC emissions, and constructs a protective system in multiple dimensions through chemical active corrosion protection, physical layered barrier, dense film formation and interface covalent bonding, and is suitable for harsh corrosion scenes such as industrial heavy-duty corrosion, ships and marine engineering.

The invention provides a preparation method of fluoromethylamine naphthyl propanol. Specifically, the method comprises the following steps: reacting a compound V with a compound VI in an inert solvent in the presence of alkali to obtain a compound VII; and then optionally carrying out salt forming reaction on the fluoromethylamine naphthyl propanol and acid to obtain the salt of the fluoromethylamine naphthyl propanol. The invention provides a new synthetic route of fluoromethylamine naphthyl propanol, and the method can simplify the operation process, avoid the use of reagents with safety risks, reduce the generation of impurities, reduce the post-treatment difficulty and significantly improve the yield, and is very suitable for industrial production.

The invention discloses a preparation method and application of a high-strength non-isocyanate polyurethane coating film, and belongs to the technical field of high-molecular polyurethane materials.Fluorine-containing monohydric alcohol, perfluoroalkyl methylamine and epoxy resin are introduced into a non-isocyanate polyurethane system in a synergistic mode, and the high-strength non-isocyanate polyurethane coating film is obtained after specific process reaction and curing. The coating film with a multi-stage composite structure is prepared. The obtained coating film has high strength, the pencil hardness reaches 4H-5H, the highest adhesion grade is 0 grade, the impact resistance reaches up to 80cm, the stress strength is between 21.32 MPa and 24.63 MPa, the strain reaches 5.43-6.04 times, the wear resistance is excellent, the mass loss is as low as 3.08-3.56 mg, the mechanical strength, water resistance, heat resistance and salt fog resistance of the coating film are jointly improved, and the coating film has good application prospects. And the harsh requirements of high-strength application scenes such as surface coating of train carriages and containers can be met.

The application belongs to the technical field of pharmaceutical analysis, and particularly relates to a detection method of ammonia in methamphetamine, which is a convenient, efficient and accurate detection method for solving the problem of ammonia detection in methamphetamine. The method uses gas chromatography to detect the content of ammonia in methamphetamine, has low detection cost, and is convenient for quality control of methamphetamine. The method is convenient, efficient and accurate, and fully meets the guiding principles of method verification of Chinese Pharmacopoeia in terms of system applicability, repeatability, specificity and accuracy, and can be used for quality control of methamphetamine.

The invention belongs to the technical field of environmental microorganisms, and particularly relates to a metolachlor anaerobic degradation strain SRB-9 and application thereof. According to the present invention, a strain SRB-9 capable of efficiently and anaerobically degrading metolachlor (MET) is separated from anaerobic sediments, and the morphological and molecular biological identification results show that the strain belongs to nitrate desulfurization vibrio, is named as Nitatidesulfurvibrio sp. SRB-9, is preserved in the China Center for Type Culture Collection (CCTCC), and has a preservation number of CCTCC M 20251781. The invention further provides a preparation method of the metolachlor-metolachlor anaerobic degradation strain SRB-9, and the metolachlor-metolachlor anaerobic degradation strain SRB-9 can be used for efficiently and anaerobically degrading metolachlor-metolachlor anaerobic degradation strain SRB-9, the bacterial strain can rapidly degrade MET under anaerobic conditions, and the degradation half-life period of the bacterial strain to MET with the concentration of 100 [mu] M is 9.6 d. And the strain can also be used for rapidly and anaerobically degrading five kinds of chloroacetamide herbicides such as alachlor, acetochlor, propisochlor, pretilachlor and butachlor. The strain disclosed by the invention is beneficial to repairing wastewater or soil polluted by various chloroacetamide herbicides, enriches a resource library of pesticide degrading bacteria, and has a good application prospect.

The invention provides a composite adsorbent and a preparation method and application thereof.The composite adsorbent comprises an activated carbon carrier, a metal organic framework layer and ionic liquid, the metal organic framework layer is loaded on the surface and in pore channels of the activated carbon carrier, and at least part of the ionic liquid is loaded in pore channels of the metal organic framework layer; the ionic liquid comprises basic ionic liquid and neutral ionic liquid. The composite adsorbent can efficiently adsorb methylamine gas, and the desorption regeneration energy consumption of the composite adsorbent is low.

The invention provides a herbicide alachlor specific artificial antigen and a preparation method and application thereof, and belongs to the technical field of pesticide residue detection. The preparation method comprises the following steps: (1) dissolving alachlor and an alkali reagent in an organic solvent, adding 3-mercaptopropionic acid as a derivative agent, and reacting to obtain alachlor hapten; and (2) dissolving the alachlor hapten in a polar solvent, adding an activator for activation, and then dropwise adding the activated hapten solution into a carrier protein solution for coupling to obtain the alachlor specific artificial antigen. The hapten is synthesized by adopting a one-step method, the steps are simplified, the post-treatment is simple, the yield can reach more than 80%, and the hapten retains characteristic functional groups of alachlor and has strong immunogenicity after being coupled with carrier protein. The alachlor monoclonal antibody prepared from the artificial antigen is good in specificity and low in cross reaction rate, the IC50 value is 5 ng / mL, and alachlor residues in food and environmental water samples can be rapidly detected.

The application discloses a narrow-band photodetector based on a bromine lead cesium / methylamine lead bromide single crystal heterojunction and a preparation method thereof, and realizes light detection through a heterojunction formed by a CsPbBr3 single crystal and a MAPbBr3 single crystal. The photodetector has the advantages of narrow detection waveband range and high selectivity.

The application provides a synthesis method of tolfenpyrad, and belongs to the technical field of medicine synthesis. Methylamine aqueous solution is used for synthesizing methylaminoformic acid ethyl ester with diethyl carbonate. N-[3-methyl-4-(4-trifluoromethylsulfanyl-phenoxy)-phenyl]-urea (arylurea) is used as a starting material to react with the obtained methylaminoformic acid ethyl ester under the action of a catalyst to synthesize biuret. The biuret is subjected to ring closing with diethyl carbonate to generate tolfenpyrad. The synthesis method does not need to use phosgene, is simple to operate, raw materials are easy to obtain, cost is low, and the yield is high.

The application discloses a horizontal high-pressure methylamine full-condensation reactor and a CO2 gas stripping method urea production system. The application adopts a special horizontal high-pressure methylamine condensation reactor and a unique urea high-pressure ring process flow, realizes that the two-step reactions of urea are carried out under the best conditions, and solves the problems of low conversion rate, low by-product steam pressure, high energy consumption and high civil framework of the traditional CO2 gas stripping method urea process. The application has the advantages of simple process, high conversion rate, low energy consumption and low framework.

The invention discloses a preparation method of bio-based 1, 2-pentamethylene diamine, and belongs to the technical field of fine chemical engineering. According to the method, a biological furfural derivative 2-furanmethylamine is taken as a raw material, and the 1, 2-pentanediamine is obtained through a reaction under the conditions that an ammonia source and a supported metal catalyst exist and the hydrogen pressure is 0.5-8 MPa and the temperature is 120-200 DEG C. The supported metal catalyst is prepared from one or more active metals selected from Rh, Co, Pt, Ni, Ru and the like and carriers such as TiO2, gamma-Al2O3, ZrO2, attapulgite and the like through an impregnation method, and the total loading amount of the active metals is 2-30 wt%. According to the method, the high-added-value 1, 2-pentanediamine is prepared from the biomass-based raw material, the reaction conditions are mild, the conversion rate of the 2-furanmethylamine can reach 100%, and the highest yield of the 1, 2-pentanediamine is 55.6%; the preparation method of the catalyst is simple, the catalyst can be repeatedly used, and an efficient new path is provided for large-scale preparation of 1, 2-pentanediamine.