15 results about "Propyne" patented technology

A method for removing acetylene from ethane cracking to olefins involves selectively hydrogenating a mixture of C2 and C3 hydrocarbons from ethane cracking to remove acetylene, propyne, and propadiene. Reaction conditions: inlet temperature 50℃~95℃, pressure 1.5~3.0MPa, space velocity 8000~14000h⁻¹ ‑1 The catalyst support is alumina or mainly alumina, and has a bimodal pore distribution structure with a micropore size of 40–70 nm and a macropore size of 200–500 nm. The specific surface area of ​​the catalyst support is 4–15 m². 2 / g. The catalyst contains at least Pd, Fe, Ni, and Cu, with Pd supported in both microemulsion and solution formats, Ni and Cu supported in microemulsion, and Fe supported in solution. The solution-supported Pd and Fe are mainly loaded in micropores of 40–70 nm, while the microemulsion-supported Ni, Cu, and Pd are mainly distributed in macropores of 200–500 nm. This alkyne removal method exhibits low reduction temperature, low "green oil" formation, and excellent catalytic performance and anti-coking properties.

The application relates to a kind of 2H-chromene phenyl ketone derivatives of double halogen substitution and preparation method and application thereof, belong to the technical field of organic room temperature phosphor material technology.The preparation method of derivative of the application comprises the following steps: (1) under inert gas protection, with halogenated salicylaldehyde and 1-(3-bromine prop-1-alkyne-1-yl) halogenated benzene as raw material, potassium carbonate as base, acetonitrile as solvent, reflux reaction is carried out, the reaction solution is extracted, dried, column chromatography separation, and intermediate 1 is obtained; (2) under inert gas protection, intermediate 1 is dissolved in dichloromethane, boron trifluoride ether is added, and stirring reaction is carried out, and the reaction solution is extracted, dried, column chromatography separation, and the application is obtained.The synthesis route of derivative of the application is simple, high in yield, easy to purify, and the prepared room temperature phosphor material can be widely applied in the field of organic light emitting diode, information encryption, biological imaging and optical sensing.

This utility model relates to the field of pesticide production technology, specifically to a device for preparing a compound suspension of propyzamide and metolachlor, comprising a mixing tank, a sealing cover fixedly connected to the upper end of the mixing tank, and a stirring assembly provided on the surface of the sealing cover. The stirring assembly includes a servo motor, a first bevel gear, a stirring frame, a connecting shaft, a second bevel gear, a first stirring blade, a stirring shaft, a third bevel gear, and a second stirring blade. A device housing is fixedly connected to the upper surface of the sealing cover, and a feed chute is provided on the left side of the device housing. Viewing windows are provided on both the front and rear sides of the sealing cover. Through the cooperation of the servo motor, the first bevel gear, the second bevel gear, the third bevel gear, the stirring frame, and the stirring shaft, the first and second stirring blades are driven to rotate in opposite directions, preventing the pesticide solution from rotating in the same direction, facilitating rapid dispersion of the internal suspension, and effectively improving the mixing efficiency and mixing effect of the pesticide solution.

This application provides a method for flotation separation of chalcopyrite and pyrite, relating to the field of mineral flotation. The method involves mixing and flotation of the minerals to be processed, including chalcopyrite and pyrite, with a chalcopyrite collector to obtain chalcopyrite concentrate and pyrite tailings. The general structural formula of the chalcopyrite collector is: [Formula omitted]. This chalcopyrite collector utilizes the high selective affinity of its propyne ester group for copper-active sites on the chalcopyrite surface and its inertness to iron sites on the pyrite surface, achieving precise identification and collection of chalcopyrite from the molecular structure of the reagent, significantly improving the grade and recovery rate of the copper concentrate. The R group is a hydrophobic group facing the pulp, significantly enhancing the surface hydrophobicity of the chalcopyrite particles, thereby enabling them to adhere to flotation bubbles and float.

To provide an azeotropic mixture and a method for reducing 2333 - trifluoropropyne (TFPY) which is an impurity in the production of 333 - tetrafluoropropene (HFO - 1234yf).SOLUTION: A heterogeneous azeotrope or azeotrope-like composition comprising TFPY and hydrogen fluoride (HF), wherein the composition may comprise from about 71. 5wt.% to about 98. 8wt.% TFPY and from about 1. 2wt.% to about 28. 5wt.% hydrogen fluoride, and wherein the composition has a boiling point from about - 10.0 °C. to about 25.0 °C. at a pressure from about 61psia to about 171psia. This azeotrope or azeotrope-like composition can be used to separate TFPY as an impurity from 2-chloro - 333 - trifluoropropene (1233xf), 2-chloro - 1112 - tetrafluoropropane (HCFC - 244bb), or HFO - 1234yf compositions.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of 3, 3, 3-trifluoro-1-propyne, and the preparation method comprises the following steps: S1, in the presence of a solvent, reacting 3, 3, 3-trifluoro-1, 1-dichloro-1-propylene or 3, 3, 3-trifluoro-1, 1-dibromo-1-propylene with a strong base to prepare a 3, 3, 3-trifluoro-1-propyne strong base salt; s2, enabling the 3, 3, 3-trifluoro-1-propyne strong alkali salt to react with water, so as to prepare the 3, 3, 3-trifluoro-1-propyne. The preparation method of the 3, 3, 3-trifluoro-1-propyne, disclosed by the invention, has the advantages of easily available raw materials, simple process, no need of using a catalyst, recyclable solvent, small amount of three wastes, high product yield and suitability for industrial application.

The application relates to an acetylenyl-modified acyl covalent organic framework (COF) material and its application, and relates to the preparation of a crystalline porous material and a fuel cell. The material is a covalent organic framework material synthesized by a solvothermal reaction under specific conditions with 1,3,5-triformylphloroglucinol and 2,5-bis(2-propynoxy)terephthalic dihydrazide as raw materials, and has high crystallinity. The material has good proton conductivity, and the highest proton conductivity can reach 6.16163*10 ‑4 S / cm. The mechanical performance is also enhanced due to the introduction of the acetylenyl group. The acetylenyl group is a kind of active functional group, can be derived into various chemical reactions, and greatly improves the potential application value of the material.

The utility model relates to the technical field of chemical engineering, in particular to a collecting tank for propyne production, which is good in sealing effect and comprises a middle round seat, a first through hole is arranged on the inner bottom wall surface of the middle round seat, a connecting pipe is arranged on the side wall of the middle round seat, a second through hole is arranged on the inner top wall surface of the middle round seat, and an upper round seat is arranged on the top end wall of the middle round seat. A motor is arranged on the top end wall of the upper round seat, a plurality of sliding grooves are formed in the inner bottom wall face of the upper round seat, a lead screw is rotationally connected to the inner top wall of the upper round seat through a bearing, the top end of the lead screw is fixedly connected with the output end of the motor through a coupler, and a connecting plate is in threaded connection with the outer wall of the lead screw. A first spring is arranged on the bottom end wall of the connecting plate, and a first spring seat is arranged on the bottom end wall of the first spring. According to the utility model, through a good sealing effect, the condition of propyne gas leakage is greatly reduced, so that the risk of explosion and fire accidents is remarkably reduced, and the safety of production equipment and the life safety of workers on a production site are powerfully guaranteed.

The invention belongs to the technical field of novel gas adsorption and separation materials, and particularly relates to a metal organic framework material for removing multi-component alkyne from an ethylene mixture as well as a preparation method and application of the metal organic framework material. The metal organic framework material takes a transition metal ion as a construction center, and is constructed by a polyazole organic ligand and an inorganic oxyacid radical; a polyazole organic ligand is used as a main connecting unit and is coordinated with transition metal ions through nitrogen-containing sites to form a basic framework of a network structure; inorganic oxyacid radicals are used as auxiliary connection units, are further coordinated with transition metal ions through oxygen sites, and participate in coordination network construction of the transition metal ions and the polyazole organic ligands. The metal organic framework material provided by the invention can efficiently and selectively adsorb multi-component alkyne such as 1-butyne, propyne, acetylene and the like at the same time, and completely excludes ethylene molecules, so that a high-purity ethylene product is prepared from an ethylene mixture containing the multi-component alkyne in one step.

The invention relates to the technical field of compound preparation, in particular to a preparation method of 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: carrying out Markov addition synthesis reaction on 3, 3, 3-trifluoro-1-propyne and a fluorinating reagent to obtain 2, 3, 3, 3-tetrafluoropropene; the fluorination reagent is prepared from pyridinium tetrafluoroborate; the structural formula of the pyridinium tetrafluoroborate is shown as a formula I, R1, R2, R3, R4 and R5 are independently selected from hydrogen and halogens, and at least two of R1, R2, R3, R4 and R5 are selected from halogens. The invention develops a new route for preparing 2, 3, 3, 3-tetrafluoropropene, and the preparation method has the advantages of mild reaction conditions, low product separation difficulty and high production safety, and can optimize the conversion rate of the reaction raw material 3, 3, 3-trifluoro-1-propyne and the selectivity of the product 2, 3, 3, 3-tetrafluoropropene at the same time.

This application relates to a method for reducing 3,3,3-trifluoropropyne in 2,3,3,3-tetrafluoropropylene. The invention relates to a method for reducing the concentration of fluorinated alkyne impurities, such as 3,3,3-trifluoropropyne (TFPY), in 2,3,3,3-tetrafluoropropylene (HFO-1234yf), comprising contacting such a mixture with a caustic material, such as sodium hydroxide (NaOH), under conditions that effectively reduce the concentration of fluorinated alkyne impurities, and in some practices including reducing the concentration by at least about 50%.

The application belongs to the field of fine chemical industry, and particularly relates to a method for rapidly preparing propargyl alcohol by using a fluidized bed reactor. 1,4-butynediol is used as raw material to produce propargyl alcohol and formaldehyde through a catalytic cracking reaction in a fluidized bed reactor under the action of a catalyst. After being separated and purified, the product is propargyl alcohol. The deactivated catalyst is regenerated in a catalyst regenerator and then recycled. The cracking reaction process is safe, dangerous gas acetylene is not used, the one-way conversion rate of 1,4-butynediol is greater than or equal to 65%, and the main reaction selectivity in the product is greater than or equal to 85%.

The invention discloses a flexible metal organic framework material with an interpenetrating structure as well as a preparation method and application thereof, and the preparation method of the metal organic framework material comprises the following steps: dissolving Zn salt, H2BDC and [4, 4-dipyridyl]-3-amine in an organic solvent, adding an HCl solution, transferring into a reactor, and reacting for 2-4 hours; sealing the reactor, transferring the reactor into a drying oven, heating and reacting at 80-120 DEG C for 18-48 hours, cooling to room temperature to obtain yellow crystal powder, and treating to obtain a product, namely the preparation. The framework material disclosed by the invention is applied to adsorption separation of C3H4 / C2H6 / C2H6 mixed gas. The framework material disclosed by the invention can be used for separating mixed gas of propane, propylene and propyne according to the difference of opening pressure of C3H4 / C2H6 / C2H6, is extremely high in separation selectivity, relatively large in adsorption capacity and excellent in separation performance, and is a relatively excellent solid physical adsorbent with various characteristics.

The present application relates to the technical field of analytical detection, and particularly relates to a method for determining water content in a propynol system sample by adding an organic solvent, comprising the following steps: (1) taking a to-be-detected layered sample containing water, n-propyl acetate and propynol in a propynol production process; (2) adding an alcohol organic solvent to the to-be-detected layered sample, stirring uniformly, and changing the sample from a water-oil layered state to a uniform clear solution; (3) determining water content in the uniform clear solution obtained in step (2) by using a Karl Fischer method. The present application has the advantages that the method eliminates the interference of water-oil layering on water content determination, improves the accuracy and repeatability of determination, and is suitable for propynol production process control.