35results about How to "Less industrial waste" patented technology

The invention relates to a method for synthesizing a fire extinguishing agent octafluorocyclobutane, and belongs to the field of organic chemical synthesis. The method for synthesizing octafluorocyclobutane is characterized in that the octafluorocyclobutane is generated from dichlorotetrafluorocyclobutene, hydrogen fluoride and chlorine gas in the presence of a fluorination catalyst. FORMULA is shown in the description. According to the method, raw materials are cheap, the raw material source is convenient, product separating and purifying is simple, industrial production is easy, and a littlethree industrial wastes (waste solid, waste water and waste gas) is generated.

The invention discloses a preparation method of prosamod, which uses bromobenzene and benzene as starting materials to prepare prosamod by adopting a convergent synthesis route. The method has high yield, low cost, less pollution of three wastes, and is easy to operate. It has high application value.

The invention discloses a method for preparing 1,3-butanediol by a fixed-bed continuous reaction. The preparation method includes the following steps: 1) using a carrier gas to send an aqueous acetaldehyde solution into a condensation reaction equipped with a solid base catalyst The fixed-bed reactor obtains the condensation reaction product; 2) the reactant stream and the hydrogen stream from which the acetaldehyde is separated are sent together into the hydrogenation reactor, and in the presence of a hydrogenation catalyst, 3-hydroxybutyraldehyde is subjected to a hydrogenation reaction to 1,3-butanediol is generated; 3) 1,3-butanediol product can be obtained by separation and purification methods such as vacuum rectification at last. According to the preparation method of the present invention, a specific solid base catalyst is used to realize an efficient condensation reaction from acetaldehyde, thereby preparing 1,3-butanediol. The method is simple and efficient, especially the fixed bed reactor is combined with a specific catalyst, the operation is simple, the environmental protection is green, and the three industrial wastes are less, and it is a sustainable green synthesis route.

The invention discloses a preparation method of a nano Ru / C supported catalyst. The method comprises steps as follows: treated activated carbon is added to a ruthenium slat aqueous solution, stirring and dipping are performed for 0.5-4 h, then an alkaline compound aqueous solution is used for adjusting the pH of mixed slurry of activated carbon and ruthenium salt to 7-12, the mixed slurry is stirred continuously for 1-6 h, left to stand for 2-4 h and filtered, a filter cake is washed with water to be neutral and free of chloride ions and dried at the temperature of 80-120 DEG C for 4-12 h, and a treated Ru / C precursor is obtained; the treated Ru / C precursor is subjected to sectioned calcination in the inert atmosphere; a product after calcination is reduced, and then the nano Ru / C supported catalyst with high dispersion is obtained. The particle size of ruthenium particles of the catalyst is 1-4 nm. The method is low in production cost, has mild preparation conditions and causes few three industrial wastes, and the catalyst has advantages of long service life and the like.

The invention relates to a method for synthesizing 3,4-difluorocyclobutene through gas phase catalysis, and belongs to the field of organic chemical synthesis. According to the method, hexachlorobutadiene (the molecular formula is CCl2=CCl-CCl=CCl2), chlorine gas (the molecular formula is Cl2) and anhydrous hydrogen fluoride (the molecular formula is HF) generate 1,2,3,4-tetrachloro-3,4-difluorocyclobutene (the molecular formula is Cyclo-CFCl-CFCl-CCl=CCl-) in a gas phase manner under the action of a cyclofluorination catalyst; and under the action of a hydrodechlorination catalyst, the 1,2,3,4-tetrachloro-3, 4-difluorocyclobutene and hydrogen generate 3,4-difluorocyclobutene (the molecular formula is Cyclo-CFH-CFH-CH=CH-) in a gas phase manner. According to the invention, the method has characteristics of cheap and easily-available raw materials, simple separation and purification of the product and less industrial three-waste, and is suitable for industrial production.

The present invention provides a casing type microchannel electrolysis reaction device and its application. The casing type microchannel electrolysis reaction device includes electrodes, feed pipes, discharge pipes and wiring piles; For the inner electrode in the outer tube electrode, the distance between the outer tube electrode and the inner electrode is 0.1-1mm; the outer tube electrode and the inner electrode are each independently selected from metal electrodes, carbon electrodes or conductive polymer electrodes , and at least one of them is a platinum-plated titanium electrode. The special design of the sleeve-type electrode realizes the fine and flexible adjustment of the electrode spacing, improves the current efficiency under the premise of ensuring the reaction conversion rate, makes the reaction conditions more mild and controllable, the reaction time is shorter, and reduces the waste of industrial waste. The production can fully meet the requirements of high efficiency, low energy consumption and environmental protection in the synthesis of organic compounds, and is especially suitable for the electrolytic preparation of substituted furan compounds or substituted pyrrole compounds.

The invention discloses a hexafluoropropylene-2-butyne synthesizing method. Hexachlorobutadiene (CCl2=CCl-CCl=CCl2) is taken as the raw material to generate hexafluoropropylene-2-butyne under the action of a catalyst, the raw material hexachlorobutadiene is easy to obtain and low in cost. The gaseous-phase circulating fluorination method is adopted, the discharge level of three industrial wastes is low, the yield of products is high, and production cost is reduced greatly; the gaseous-phase circulating fluorination method is conducted at normal temperature, the traditional high-pressure telomerization process route is avoided, and risks in industrial safety production are reduced greatly; meanwhile, the method has the advantage that operation is easy and is totally suitable for industrial production.

The invention discloses a nano-ruthenium carbon catalyst as well as a preparation method and application thereof. The catalyst includes active carbon, active ruthenium particles supported thereon and auxiliary components, and the auxiliary components include zinc, copper, nickel and the like. The preparation method comprises: immersing activated carbon in an aqueous solution of ruthenium salt, adding a basic compound, stirring and standing still, filtering and drying, and roasting to obtain the first ruthenium carbon precursor, then immersing in an aqueous solution of an auxiliary agent, and then adding a basic compound , after stirring and standing still, filter and dry to obtain the second ruthenium carbon precursor; in a protective atmosphere, the second ruthenium carbon precursor is subjected to segmental roasting treatment to obtain the third ruthenium carbon precursor, followed by reduction treatment, obtain the catalyst. The catalyst of the invention can be reused more than one hundred times in the hydrogenation reaction of aromatic ring compounds to prepare cyclohexyl derivatives, and has the advantages of long service life, low production cost, mild reaction conditions, high product purity and less industrial waste.

The invention relates to a method for gas phase catalytic synthesis of 3,4,4-trifluorocyclobutene, and belongs to the field of organic chemical synthesis. According to the method, hexachlorobutadiene(the molecular formula is CCl2=CCl-CCl=CCl2), chlorine (the molecular formula is Cl2) and anhydrous hydrogen fluoride (the molecular formula is HF) generate 1,2,3-trichloro-3,4,4-trifluorocyclobutene(the molecular formula is Cyclo-CF2-CFCl-CCl=CCl-) in a gas phase manner under the action of a cyclofluorination catalyst; and under the action of a hydrodechlorination catalyst, the 1,2,3-trichloro-3,4,4-trifluorocyclobutene and hydrogen generate 3,4,4-trifluorocyclobutene (the molecular formula is Cyclo-CF2-CFH-CH=CH-) in a gas phase manner. According to the invention, the method has characteristics of cheap and easily-available raw materials, simple separation and purification of product and less industrial three-waste, and is suitable for industrial production.

The invention belongs to the technical field of organic synthesis, and specifically relates to N-[(3,4,5-trifluoro)phenyl]acrylamide and a preparation method thereof. The specific steps of the preparation method of N-[(3,4,5-trifluoro)phenyl]acrylamide are as follows: (1) 3,4,5-trifluoroaniline, reaction solvent and catalyst are added to the reaction vessel, stirred and mixed Then add acryloyl chloride and react at -10°C to 30°C for 1 to 7 hours; (2) Add water to the reaction solution obtained in step (1), stir and mix, filter, separate the precipitate, and dry the precipitate , to obtain N‑[(3,4,5‑trifluoro)phenyl]acrylamide. The preparation method of the present invention has simple and easy-to-obtain raw materials, low cost, simple operation, high yield and high purity of N-[(3,4,5-trifluoro)phenyl]acrylamide; weakly basic catalyst—sodium bicarbonate The reaction amplification process is simple and feasible, the three wastes produced by the reaction are less, and the reaction is green and environmentally friendly.

The invention discloses a synthesis method of N-tert-butylbenzenesulfonamide. The method comprises the following steps: putting benzenesulfonamide, materials, a catalyst and a solvent into a four-necked flask and stirring; heating and carrying out reflowing reaction; when the raw material benzenesulfonamide disappears, reaching a reaction end point to obtain a reactant; cooling the reactant to room temperature; filtering to remove an insoluble substance; carrying out decompression and desolvation to obtain the N-tert-butylbenzenesulfonamide.

The invention relates to a method for replacing fluorine on double bonds of fluorinated alkene with hydrogen and belongs to the field of organic chemical synthesis. The method for replacing fluorine on the double bonds with hydrogen is characterized by comprising the following steps: reacting fluorinated alkene and carbon tetrachloride in the presence of a catalyst, and changing fluorine on the double bonds into chlorine at high selectivity; and changing the chlorine on the double bonds into hydrogen in the fluorinated alkene in the presence of a catalyst of replacing chlorine with hydrogen. The structural formula is as shown in the specification. According to the method disclosed by the invention, the raw materials are cheap and convenient in source; the product separation and purification are simple; industrialized production is easily realized; industrial three wastes are less.

The invention provides a kind of synthetic method of phenylethylene glycol, and this synthetic method comprises the following steps: (1) reaction: add styrene oxide, phase transfer catalyst, 2-chloroethyl in the flask with thermometer, reflux condenser Amine hydrochloride, inorganic alkali, water, stirring, heating and reflux reaction; (2) End point monitoring: the reaction of step (1) is monitored by HPLC, when the raw material styrene oxide disappears, it is the end point of the reaction; (3) Extraction: When the reaction in step (1) reaches the end of the reaction, stop heating, cool the system to room temperature, extract with an organic solvent, separate the organic layer, and precipitate under reduced pressure to obtain a white solid. The prepared product has high purity and yield, reduces three industrial wastes, is environmentally friendly, and meets the requirements of green chemical technology.