8 results about "Vinylacetylene" patented technology

The invention provides a method for synthesizing 1, 3-butadiene by continuous catalytic conversion of acetylene, which comprises the following steps: S1, continuously introducing acetylene as a raw material into a reactor I for acetylene dimerization catalytic reaction to obtain primary reaction gas containing vinyl acetylene; and S2, continuously introducing the initial reaction gas and hydrogen into a reactor II, and carrying out selective catalytic hydrogenation reaction to obtain 1, 3-butadiene. The technical scheme of the invention provides a continuous catalytic process method, and 1, 3-butadiene is directly synthesized by using acetylene as a raw material through coupling acetylene catalytic dimerization reaction and vinyl acetylene selective catalytic hydrogenation reaction. The obtained product is easy to separate from a catalytic system, and the whole process flow is simple to operate, economical and environment-friendly, and has a good application prospect.

The application discloses a NaCl modified Cu-Na-DMF / AC catalyst and a preparation method and application thereof. The NaCl modified Cu-Na-DMF / AC catalyst comprises a main catalyst, a ligand, a metal additive and a carrier. The main catalyst is copper chloride; the ligand is N,N-dimethylformamide; the metal additive is sodium chloride; and the carrier is coconut shell activated carbon. The NaCl modified Cu-Na-DMF / AC catalyst and the preparation method and application thereof have the advantages that the low coordination copper site induced by NaCl modification has superior catalytic activity, so that the NaCl modified Cu-DMF complex loaded on the carrier can significantly improve the stability of an acetylene dimerization catalyst system, the single-pass conversion rate of acetylene and the ethynyl acetylene selectivity are improved, the by-products in the reaction process are less, the content of acetylene polymer is greatly reduced, and then the separation difficulty and the production cost are reduced. Moreover, the catalyst has the advantages of mild preparation condition, simple process, short preparation period, low cost, and suitability for acetylene dimerization reaction.

The invention relates to a catalyst for acetylene dimerization reaction as well as a preparation method and application thereof. The invention discloses a catalyst for acetylene dimerization reaction. The catalyst comprises a main catalyst, a ligand and a carrier, the main catalyst is copper chloride; wherein, the ligand is 1-ethyl-2-pyrrolidone, and the ligand is 2-methyl-2-pyrrolidinone; the carrier is coconut shell activated carbon. According to the catalyst for acetylene dimerization reaction as well as the preparation method and the application of the catalyst, water is taken as a solvent, 1-ethyl-2-pyrrolidone is taken as a ligand, and the catalyst has the characteristics of low price and environment friendliness, and is high in acetylene activation capacity, acetylene conversion rate and vinyl acetylene selectivity.

The subject of the invention is a method for the regeneration of a solvent used in the extractive distillation of C4 unsaturated hydrocarbon mixtures, preferably a polar solvent from the group consisting of DMF, ACN, NMP, DMSO, wherein the mixture contains unsaturated acetylenic and diene hydrocarbons, in particular methylacetylene, ethylacetylene, vinylacetylene, 1,2-butadiene, propadiene, optionally 1,3-butadiene, butene isomers, dimers and other heavy C5+ hydrocarbons, wherein the method is based on hydrogenating the solvent before its regeneration by distillation.

The application discloses an ethyne dimerization functional ionic liquid phase catalyst and a preparation method and application thereof. The ethyne dimerization functional ionic liquid phase catalyst is composed of an active component and a functional acidic ionic liquid; the active component is one of cuprous chloride, copper phthalocyanine and copper phosphate; the functional acidic ionic liquid is at least one selected from ionic liquids shown in formula (I)-(IV) and at least includes one ionic liquid A selected from ionic liquids shown in formula (I) or (II), and the total mass percentage of the ionic liquid A in the total mass of the functional acidic ionic liquid is at least 58%. The catalyst has the characteristics of simple composition, easy preparation process, green environmental protection, high ethyne single-pass conversion rate and good ethynylacetylene selectivity.

The present invention relates to a composite oxide, the composite oxide comprising 60-95 wt% of aluminum oxide and 5-40 wt% of titanium dioxide. The specific surface area of the composite oxide determined by means of BET method is expressed as X m2 / g; the average pore diameter of the composite oxide determined by means of nitrogen adsorption isothermal curve method is expressed as Y nm, wherein the ratio of X to Y is 5-30; and by means of the determination of X-ray diffraction method, titanium dioxide in an anatase crystalline phase in the composite oxide accounts for 95-100 wt% of the total titanium dioxide, wherein X is in the range of 50-200, preferably X is in the range of 60-180, more preferably in the range of 80-150, and Y is in the range of 5-25 nm. The present invention further provides a hydrogenation catalyst comprising the composite oxide, which catalyst shows a very high vinyl acetylene conversion rate and high 1,3-butadiene selectivity.

The invention relates to an organic nitrogen carboxylic acid modified Nieuwland catalyst as well as a preparation method and application thereof. The invention relates to an organic nitrogen carboxylic acid modified Nieuwland catalyst which comprises cuprous chloride, ammonium chloride, organic nitrogen carboxylic acid and a solvent. The invention further discloses a preparation method and application of the organic nitrogen carboxylic acid modified Nieuwland catalyst. According to the organic nitrogen carboxylic acid modified Nieuwland catalyst as well as the preparation method and the application thereof, the conversion rate of acetylene and the yield of vinyl acetylene are improved through organic nitrogen carboxylic acid modification.

The utility model relates to the field of chemical engineering, in particular to a xylene recovery device for vinyl acetylene production. The xylene recovery device for vinyl acetylene production comprises an absorption tower, a polymerization kettle, a recovery tower, a condenser and a filtering device, the absorption tower is used for absorbing DVA, high polymers and main xylene components in reaction gas, the absorption tower is connected with the polymerization kettle through a pipeline, and the polymerization kettle is used for polymerizing DVA in the absorption tower and DVA in xylene. According to the xylene recovery device for vinyl acetylene production, the absorption tower and the recovery tower are effectively combined, xylene in the production process can be efficiently recovered, waste of raw materials is reduced, the utilization rate of resources is improved, the production cost is reduced, and the production efficiency is improved through the effect of the condenser and the recovery device. Xylene in the waste gas can be condensed into a liquid state to be recycled, so that pollution caused by direct emission of the waste gas into the environment is avoided, and negative effects on the environment are reduced.