摘要:
A PROCESS FOR THE CATALYTIC DIMERISATION OF 1,3-DIOLEFINES IS DISCLOSED. PREFERRED DIOLEFINES ARE BUTADIENE, ISOPRENE AND PIPERYLENE. THE CATALYSTS USED ARE ONES FORMED BY MIXING A REDUCIBLE NICKEL COMPOUND AND A METAL HAVING A REDUCING ACTION WITH RESPECT TO THE REDUCIBLE NICKEL COMPOUND OR A HALOGEN-FREE ORGANOMETALLIC COMPOUND, OF WHICH METAL ALKYLS, METAL ARYLS OR METAL HYDRIDES ARE EXAMPLES, AND AN ELECTRON DONOR. THEY MAY ALSO BE FORMED BY MIXING A NICKEL COMPLEX COMPOUND WHICH CONTAINS O-VALENT NICKEL WITH AN ELECTRON DONOR. THE ELECTRON DONOR MAY BE AN ESTER OF A PHOSPHOROUS ACID OR A DIOLEFINE. THE PROCESS IS CARRIED OUT WITH INCOMPLETE CONVERSION OF THE 1,3-DIOLEFINE.
摘要:
A method for making a fuel includes reacting a conjugated diene or a mixture of conjugated dienes with a catalyst selected from the group consisting of a low valent iron catalyst stabilized with a pyridineimine ligand, an iron precatalyst coordinated to the pyridineimine ligand that is activated with a reducing agent, a low oxidation state Fe complex stabilized with a pyridineimine ligand and a coordinating ligand, and combinations thereof, thereby forming a substituted cyclooctadiene. The substituted cyclooctadiene is then hydrogenated, thereby forming cyclooctane fuel.
摘要:
Methods and systems are provided for converting methane in a feed stream to acetylene. The hydrocarbon stream is introduced into a supersonic reactor and pyrolyzed to convert at least a portion of the methane to acetylene. The reactor effluent stream may be treated to convert acetylene to a process stream having aromatic compounds. The acetylene stream can be reacted to generate larger hydrocarbon compounds, which are passed to a cyclization and aromatization reactor to generate aromatics. The method according to certain aspects includes controlling the level of carbon oxides in the hydrocarbon stream.
摘要:
Formation of undesirable popcorn polymer on the walls of a reaction vessel during thermal dimerization of butadiene is prevented by coating the walls with a falling film of aqueous sodium nitrite solution.
摘要:
A process for purifying crude dicyclopentadiene which comprises the steps of: cracking the crude dicyclopentadiene to form a monomeric-containing effluent which comprises at least one monomer selected from the group consisting of: C.sub.4 acyclic dienes, C.sub.5 acyclic dienes, cyclopentadiene and methylcyclopentadiene; separating the monomeric-containing effluent into a cyclopentadiene-enriched stream and a cyclopentadiene-poor stream; dimerizing the cyclopentadiene-enriched stream to form a dimerizer effluent; contacting a membrane separator under pervaporation conditions with the dimerizer effluent wherein the C.sub.4 acyclic dienes, C.sub.5 acyclic dienes and cyclopentadiene permeate through the membrane separator and wherein a dicyclopentadiene product having a purity of at least about 98% is retained as retentate.
摘要:
Recently, as a process for manufacturing cyclopentadiene resin-shaped articles, an attention has been given to reaction injection molding (RIM). To conduct RIM, it is necessary to use high purity dicyclopentadiene (DCPD) as the raw material. Vapor-phase thermal cracking of DCPD is usually used as a step of process for manufacturing high purity DCPD. Hithertofore, when conducting thermal cracking of DCPD, coke formation within cracking tubes is the most serious and troublesome problem. A vapor-phase thermal cracking process for resolving the problem by a very simple procedure is described herein. Further, a process for manufacturing high purity DCPD suitable as a raw material for use in RIM utilizing the vapor-phase thermal cracking process just mentioned above is also described.