摘要:
A method for producing butadiene from 2,3-butanediol with high selectivity without using a radioactive substance is disclosed. The method for producing butadiene comprises the step of dehydrating 2,3-butanediol in the presence of a catalyst containing an alkali metal salt of phosphoric acid such as an alkali metal dihydrogen phosphate supported on silica. Preferred examples of the alkali metal herein include K, Rb, and Cs. The catalyst is preferably a catalyst prepared by calcination of the silica to which the alkali metal of phosphoric acid is attached.
摘要:
A process and apparatus that uses a debutanizer with a side stripper can recover a light stream, an intermediate stream and a liquid stream. One of the intermediate stream and the liquid stream can be recycled to oligomerization or to fluid catalytic cracking.
摘要:
An overbased salt of an oligomerized alkylhydroxyaromatic compound for use in a lubricating oil composition is disclosed, wherein the alkyl group of the alkylhydroxyaromatic compound is derived from an olefin mixture comprising propylene oligomers having an initial boiling point of at least about 195°C and a final boiling point of greater than 325°C and up to about 400°C as measured by ASTM D86. Also disclosed is a propylene oligomer having an initial boiling point of at least about 195°C and a final boiling point of greater than 325°C and up to about 400°C as measured by ASTM D8, wherein the propylene oligomer contains a distribution of carbon atoms that comprise at least about 50 weight percent of C14 to C20 carbon atoms.
摘要:
A process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane which comprises reacting phenol with 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst, adding an aqueous solution of an alkali to the resulting reaction mixture to neutralize it, removing a water phase from the thus neutralized reaction mixture, cooling the resulting oil phase to crystallize phenol adduct crystals of 1, 1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane while obtaining a primary crystallization filtrate, wherein the primary crystallization filtrate is heated to a temperature of 150-250°C in the presence of an alkali catalyst in an inert gas atmosphere under a reduced pressure to thermally decompose 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane in the primary crystallization filtrate.
摘要:
A process for the production of C 8 and higher olefins by the oligomerization of light olefins to heavier olefins is improved by the addition of cycloparaffins to the oligomerization zone. The recycle of the cycloparaffins extends the catalyst activity and improves the catalyst life.
摘要:
A process for the production of oligomers useful as bases for synthetic lubricants starting from internal C 13 -C 14 olefins, which comprises:
(a) contacting said olefins with an acid catalyst in the presence of gaseous BF 3 at a temperature not higher than 60°C; (b) neutralizing and washing the reaction raw product; (c) hydrogenating the oligomers thus obtained and finally; (d) removing the light products from the end-oil obtained in (c).