8 results about "Propadiene" 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 the technical field of organic synthesis, and particularly relates to a preparation method of alpha, beta-unsaturated carboxylic acid ester, which comprises the following steps: mixing a ruthenium catalyst, an organic nitrogen ligand, a 1,2-propadiene compound and an alcohol compound under the condition of carbon monoxide, and then performing reaction to obtain alpha, beta-unsaturated carboxylic acid ester. The application adopts the 1,2-propadiene compound to perform a hydrogen esterification reaction to efficiently prepare alpha, beta-unsaturated carboxylic acid ester; through the regulation of the organic nitrogen ligand on the ruthenium catalyst, the target product can be efficiently and highly selectively synthesized, and the application has a good industrialization prospect; meanwhile, in the preparation method, the reaction condition is relatively mild, excellent conversion of the substrate can be realized at a relatively low reaction temperature, catalyst deactivation can be effectively avoided, and the conversion rate of the substrate and the yield of the product are relatively high. In addition, the application is widely applicable, and can be used to synthesize various types of alpha, beta-unsaturated carboxylic acid ester in one step.

The invention discloses a multi-component mixed refrigerant suitable for a-150 DEG C cryogenic temperature zone, which comprises a first group of substances, a second group of substances, a fifth group of substances, a third group of substances, a fourth group of substances or one of the substances, and the first group of substances is R728, R740, He or a mixture thereof; the second group of substances is R14, R50, R784 or a mixture thereof; the third group of substances are R23, R1150, R41, R744 and Xe or a mixture of at least two of the R23, the R1150, the R41, the R744 and the Xe; the fourth group of substance is R170, perfluoro R290, R1270, R1216, R125, R1270 propadiene or a mixture of at least two substances of the R170, the perfluoro R290, the R1270, the R1216, the R125 and the R1270 propadiene; and the fifth group of substances is R227ea, R3110, R254cb, R347mcc, R338mcf, R338mcc, R1234ZE (E), R600a, R152a or a mixture of at least two of the R227ea, the R3110, the R254cb, the R347mcc, the R338mcf, the R338mcc, the R1234ZE (E), the R600a and the R152a.

The present invention relates to the field of selective hydrogenation, and in particular to a method for hydrogenating alkynes and dienes. The method comprises: heating a liquid phase C3 material to a gas phase, mixing the mixture with hydrogen, and selectively hydrogenating the mixture under the action of a supported palladium catalyst; the catalyst has a basic center, and the basic center enables the catalyst to have a pyrrole adsorption in-situ infrared spectrum at 40°C, with a peak at 3250-3370 cm ‑1 The N-H bond stretching vibration absorption peak appears in the range of 3160-3420cm in the in-situ infrared spectrum of the catalyst after pyrrole adsorption at 40 ° C and nitrogen purge at 0 minutes and 15 minutes. ‑1 The ratio of the peak heights of the absorption peaks within the range is greater than 5. This method has the advantages of low content of methyl acetylene and propadiene in the outlet, can prevent polymerization and coking during gas phase hydrogenation, has better propylene selectivity and lower C4+ production, thereby extending the operating cycle of the alkyne and diene hydrorefining process.

The application discloses a method for separating propyne and propadiene, which comprises the following steps: contacting mixed gas containing propyne and propadiene with a metal organic framework material having special window active sites, and selectively adsorbing propyne in the mixed gas by the metal organic framework material, so as to realize the separation of propadiene and propyne; the metal organic framework material is formed by coordinating a six-coordinated divalent metal cation Cu 2+ with a tridentate nitrogen-containing ligand L to form a cage structure, and then bridging a high-coordination-number divalent inorganic anion ZrF6 2‑ to form a structure having special window active sites; the molecular formula of the metal organic framework material is (CuZrF6)3L4, wherein the tridentate nitrogen-containing ligand L is tris(4-pyridyl)amine. The method can separate propyne and propadiene mixed gas with high capacity and high selectivity, the adsorbent is easy to regenerate, and the hydrothermal stability is good.

The present invention relates to the field of catalytic hydrogenation, more particularly to the semi-hydrogenation of allene to the corresponding olefin in the presence of a homogeneous catalytic system comprising a cobalt salt, a bidentate diphosphine ligand and a weakly or non-coordinating monovalent anion or reducing agent.

The present invention relates to the field of catalytic hydrogenation, and more particularly, to the semi-hydrogenation of propadiene into corresponding olefins in the presence of a heterogeneous catalyst.

This disclosure relates to compositions comprising monodisperse assemblies of propadiene oxide synthase (AOS), and particularly compositions and assemblies comprising AOS enzyme and polysorbate surfactant. Such compositions have improved enzyme activity and are particularly useful for improving biological conditions under oxidative stress.