5 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 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.