摘要:
Preparation of 1-aryl-1-alkenes by dehydration of 1-aryl-1-alkanols in the presence of a substance promoting elimination of water, the substance being a triester of phosphorous acid in which at least one of the radicals is an aryl group.The products are suitable as, inter al., initiators for anionic polymerization.
摘要:
A fluorine-containing silane compound of the formula: ##STR1## wherein R.sub.f is a fluorine-containing C.sub.4 --C.sub.18 aliphatic group, R.sup.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl group, A is a straight or branched C.sub.1 -C.sub.12 alkylene group or a group of the formula: ##STR2## in which R.sup.2 is hydrogen or a C.sub.1 -C.sub.3 acyl group, R.sup.3 is a C.sub.1 -C.sub.6 acyl group, A' is a C.sub.2 -C.sub.8 alkylene group, A" is a C.sub.1 -C.sub.4 alkylene group, and Q is --CO-- or --SO.sub.2 --, B is a group of the formula: ##STR3## in which R.sup.4 and R.sup.5 are each a straight or branched C.sub.2 or C.sub.3 alkylene group, and p is 2 or 3, X is chlorine or a C.sub.1 -C.sub.3 alkoxy group, X' is chlorine or a C.sub.1 -C.sub.3 alkyl or alkoxy group, a phenyl group or a glycidyl group, m is 0 or 1, and n is an integer of 0 to 40, which modifies surface characteristics of a solid substrate.
摘要:
A process is disclosed, for the manufacture of carbonylated products and/or olefins by reacting hydrocarbons with carbon monoxide in the presence of a transition metal complex, under irradiation with light.
摘要:
Coupling agents suitable to be synthetized by cyclo-oligomerization of 3-methylbutyn-1-ol-3 with subsequent dehydration of the alcohol compounds, and their use in a method for the termination of living polymers obtained by means of the anionic polymerization of diene and/or vinylaromatic monomers.
摘要:
Method for removal of phenolic polymerization inhibitors from liquid conjugated olefin hydrocarbon by contacting said liquid hydrocarbon with a sorbent material comprising particulate acidified active carbon which sorbent has previously been oxidized by contact with a highly acidic oxidizing fluid. Optionally, after contact with the highly acidic oxidizing fluid the sorbent may be further treated in an alkaline environment with compounds of at least one of alkali metals, alkaline earth metals and ammonia. The sorbent material may be regenerated by heating, or by passing a heated non-oxidizing gas e.g., superheated stream there through.
摘要:
Vinylaromatic compounds are stabilized against undesired polymerization by adding to the vinylaromatic compounds small amounts of zinc or nickel salts of dialkyl dithiocarbamates, specifically p-diisopropenylbenzene can be stabilized by the use of zinc dibutyldithiocarbamate.
摘要:
Diisopropenylbenzene is a monomer that can be used in the preparation of many useful polymers and is also a chemical intermediate that can be employed in a number of chemical processes. Diisopropenylbenzene is normally synthesized by the dehydrogenation of diisopropylbenzene. Unfortunately in this dehydrogenation process a number of olefinic impurities are produced as by-products. This invention discloses a process for the separation of diisopropenylbenzene from these impurities and for recycling some of the impurities. In one embodiment of this invention this process comprises: (1) dehydrogenating diisopropylbenzene to form a dehydrogenation mixture containing diisopropenylbenzene and organic impurities, (2) continuously distilling said dehydrogenation mixture to separate said diisopropenylbenzene from said organic impurities, (3) fully hydrogenating said organic impurities to form a mixture of regenerated diisopropylbenzene and saturated organic impurities, and (4) fractionally distilling said mixture of regenerated diisopropylbenzene and saturated organic impurities under conditions sufficient to separate said regenerated diisopropylbenzene from said saturated organic impurities. The regenerated diisopropylbenzene can then be recycled for dehydrogenation with fresh diisopropylbenzene in the first step of the above described process.
摘要:
A hydrocarbon conversion process is disclosed for the dehydrogenation of alkylaromatic hydrocarbons such as ethylbenzene or ethyltoluene. A subatmospheric pressure is maintained in the reaction zone by the use of two separate compressors. The first compressor pressurizes the vapor phase reactor effluent prior to the final indirect heat exchange step(s) used to partially condense this stream. The second compressor maintains the vapor-liquid separator which receives the partially condensed reactor effluent stream at a subatmospheric pressure. This facilitates operation of the reactor at a subatmospheric pressure.
摘要:
A method and apparatus for inhibiting polymerization of vinylaromatic compounds during distillative purification wherein downcomers and tray bottoms of the distillation column exposed to high concentrations of liquid monomer condensate and low vapor velocities are coated with a non-wetting fluorocarbon polymer.
摘要:
This invention provides an improved oxydehydrogenation process for the production of tertiary-butylstyrene which involves the contacting of a vapor phase mixture of tertiary-butylethylbenzene and oxygen with a novel coprecipitated nickel-zirconium phosphate or nickel-zirconium-cerium phosphate catalyst composition.The tertiary-butylstyrene is produced with a high conversion selectivity, and concomitantly there is little or no dialkenylbenzene byproducts produced.