Showing papers by "Peter Schwab published in 2001"
Patent•
12 Mar 2001
TL;DR: The process for preparing propene and hexene from a raffinate II feed stream comprising olefinic C4-hydrocarbons comprises a metathesis reaction in which butenes present in the feed stream are reacted with ethene in the presence of a catalytic catalyst comprising at least one compound of a metal of transition groups VIb, VIIb or VIII of the Periodic Table of the Elements as discussed by the authors.
Abstract: The process for preparing propene and hexene from a raffinate II feed stream comprising olefinic C4-hydrocarbons comprises a) a metathesis reaction in which butenes present in the feed stream are reacted with ethene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition groups VIb, VIIb or VIII of the Periodic Table of the Elements to give a mixture comprising ethene, propene, butenes, 2-pentene, 3-hexene and butanes, using, based on the butenes, from 0.05 to 0.6 molar equivalents of ethene, b) firstly fractionally distilling the product stream obtained in this way to give a low-boiling fraction A comprising C2-C3-olefins and a high-boiling fraction comprising C4-C6-olefins and butanes, c) subsequently fractionally distilling the low-boiling fraction A obtained from b) to give an ethene-containing fraction and a propene-containing fraction, with the ethene-containing fraction being returned to the process step a) and the propene-containing fraction being discharged as product, d) subsequently fractionally distilling the high-boiling fraction obtained from b) to give a low-boiling fraction B comprising butenes and butanes, a pentene-containing intermediate-boiling fraction C and a hexene-containing high-boiling fraction D, e) where the fractions B and C are completely or partly returned to the process step a) and the fraction D is discharged as product.
34 citations
Patent•
22 Mar 2001
TL;DR: In this article, a method for producing essentially unbranched oligomers of alkenes having 4 to 6 carbon atoms starting from the alkeners or from a hydrocarbon stream, which contains such alkenses, on a heterogeneous catalyst containing nickel was presented.
Abstract: The invention relates to a method for producing essentially unbranched oligomers of alkenes having 4 to 6 carbon atoms starting from the alkenes or from a hydrocarbon stream, which contains such alkenes, on a heterogeneous catalyst containing nickel in an adiabatically operated reactor at temperatures ranging from 20 to 300 °C and at pressures ranging from 1 to 100 bar. To this end, a first partial stream of the discharge from the reactor is processed whereby forming the oligomers and the second partial stream together with fresh alkene or a fresh hydrocarbon stream containing such alkenes is returned to the reactor.
17 citations
Patent•
18 Jan 2001
TL;DR: In this paper, the Verfahren zur Herstellung Von C 5 -/C 6 -Olefinen aus einem olefinischen C 4 -Kohlenwasserstoffe enthaltenden Ausgangsstrom is dadurch gekennzeichnet, das DOLLAR A a) in Gegenwart eines Metathesekatalysators, der mindestens eine Verbindung eines metalls der VI.b, VII.b oder VIII.b ent
Abstract: Das Verfahren zur Herstellung Von C 5 -/C 6 -Olefinen aus einem olefinischen C 4 -Kohlenwasserstoffe enthaltenden Ausgangsstrom ist dadurch gekennzeichnet, das DOLLAR A a) in Gegenwart eines Metathesekatalysators, der mindestens eine Verbindung eines Metalls der VI.b, VII.b oder VIII. Nebengruppe des Periodensystems der Elemente enthalt, eine Metathesereaktion durchgefuhrt wird, im Rahmen derer im Ausgangsstrom enthaltenes 1-Buten, 2-Buten und Isobuten zu einem Gemisch aus C 2 -C 6 -Olefinen und Butanen umgesetzt werden, DOLLAR A b) der so erhaltene Austragsstrom zunachst destillativ getrennt wird in eine aus C 2 -C 4 -Olefinen und Butanen oder aus C 2 -C 3 -Olefinen bestehende Leichtsiederfraktion A, die ausgeschleust wird, sowie in eine aus C 4 -C 6 -Olefinen und Butanen bestehende Schwersiederfraktion, DOLLAR A c) die aus b) erhaltene Schwersiederfraktion anschliesend destillativ in eine aus Butenen und Butanen bestehende Leichtsiederfraktion B, eine aus Penten und Methylbuten bestehende Mittelsiederfraktion C und in eine aus Hexen und Methylpenten bestehende Schwersiederfraktion D getrennt wird, DOLLAR A d) wobei die Fraktionen B und/oder C komplett oder teilweise in den Verfahrensschritt a) zuruckgefuhrt werden und die Fraktion D als Produkt ausgeschleust wird.
6 citations
Patent•
13 Mar 2001
TL;DR: In this paper, the production of propene and hexene from butenes in a raffinate II C4 fraction is described, where the butenes react with ethene in a butene:ethene molar ratio of 1:0.05-0.6 in the presence of a Group VIb, VIIb or VIII metal metathesis catalyst.
Abstract: Production of propene and hexene from butenes in a raffinate II C4 fraction. Production of propene and hexene from butenes in a raffinate II C4 fraction comprises: (a) reacting the butenes with ethene in a butene:ethene molar ratio of 1:0.05-0.6 in the presence of a Group VIb, VIIb or VIII metal metathesis catalyst; (b) distilling the effluent to obtain a light fraction A comprising C2-C3 olefins and a heavy fraction B comprising C4-C6 olefins and butanes; (c) distilling fraction A to obtain an ethene fraction for recycle to step (a) and a propene fraction as product; (d) distilling fraction B to obtain a light fraction C comprising butenes and butanes, a medium fraction D comprising pentene and a heavy fraction E comprising hexene; and (e) at least partly recycling fractions C and D and withdrawing fraction F as product.
3 citations
Patent•
21 Mar 2001
TL;DR: In this article, a method for producing an alcohol mixture for an ester plasticizer by using a hydrocarbon mixture was proposed, which is useful for producing a plasticizer or a plasticization mixture for a molding material.
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing an alcohol for an ester plasticizer by using a hydrocarbon mixture. SOLUTION: This method for producing an alcohol mixture comprises (a) reacting a hydrocarbon mixture containing cyclopentene and at least one kind of an acyclic monoolefin by a metathesis reaction, (b) isolating an olefin fraction substantially containing 6-12 carbon atoms from the metathesis reaction mixture, (c) at least partially hydrogenating two or more unsaturated compounds contained in the olefin fraction selectively into a monoolefin, if necessary and (d) hydroformylating the monoolefin fraction selectively hydrogenated, if necessary, by a catalytic action by a reaction using carbon monoxide and hydrogen and hydrogenating the hydroformylated substance. The method is useful for producing a plasticizer or a plasticizer mixture for a molding material.
2 citations
Patent•
16 Feb 2001
TL;DR: In this paper, a method for polyisocyanates of general formula (I), wherein R and R' are the same or different and mean alkyl groups having 1-4 C atoms and n is a number that amounts to 1.5 to 5 on average, was proposed.
Abstract: The invention relates to polyisocyanates of general formula (I), wherein R and R' are the same or different and mean alkyl groups having 1-4 C atoms and n is a number that amounts to 1.5 to 5 on average. The invention also relates to a method for producing said polyisocyanates. According to the inventive method, a polyamine of formula (II), wherein R, R' and n have the aforementioned meaning, is converted with phosgene. The novel polyisocyanates are suitable for producing cross-linked polyurethanes from reaction mixtures having a low content of solvents and for producing coating means or adhesives. The invention further relates to the coating means and adhesives and the use thereof.
2 citations
Patent•
11 Dec 2001
TL;DR: The preparation of olefins from steam cracker or refinery C4 streams is carried out by (a) if desired, extractive distillation of butadiene from the C4 stream using abutadiene-selective solvent, (b) selective hydrogenation of butadienes and acetylenic impurities in the steam-cracker or refinery c4 stream or the stream from step (A), with simultaneous or subsequent, at least partial isomerization of 1-butene to 2 -butene, (c) removal of i-but
Abstract: The preparation of olefins from steam cracker or refinery C4 streams is carried out by (A) if desired, extractive distillation of butadiene from the C4 stream using a butadiene-selective solvent, (B) selective hydrogenation of butadienes and acetylenic impurities in the steam cracker or refinery C4 stream or the stream from step (A), with simultaneous or subsequent, at least partial isomerization of 1-butene to 2-butene, (C) removal of i-butene from the C4 stream obtained in step (B) by reaction with an alcohol to form an ether, (D) removal of oxygen-containing impurities from the C4 stream obtained in step (C) using absorber materials, (E) two-stage metathesis of the butenes in the C4 stream obtained in step (D) by conversion of 1-butene and 2-butene present in the C4 stream into propene and 2-pentene and subsequent reaction of the 2-pentene with ethene in the presence of a metathesis catalyst to form propene and 1-butene.
1 citations