Abstract:
A method for the separation of material mixtures of pentenenitrile isomers is disclosed, whereby at least one isomer of the mixture is enriched and the separation of the material mixture of pentenenitrile mixtures is carried out by distillation at reduced pressure.
Abstract:
The invention relates to a method for producing 3-pentenenitrile by means of the hydrocyanation of 1,3-butadiene, whereby 1,3-butadiene is reacted with hydrogen cyanide in the presence of at least one catalyst, and the resulting flow is purified by distillation, the bottom temperature not exceeding 140 °C during the distillation.
Abstract:
The invention relates to phosphinite phosphites I of formula 1, 2, 3, 4, 5 or 6 and mixtures thereof, wherein R1, R2, R4 independently represent an alkyl or alkylene group with 1 to 8 carbon atoms, provided that at least one of the groups R1, R2, R4 is different from H; R5 to R22 independently represent H, an alkyl or alkylene group with 1 to 8 carbon atoms; R3 is H, methyl or ethyl; X is F, Cl or CF3, if n = 1 or 2 and X is H, if n = 0.
Abstract:
Distillation of water, 1- and 2 butene and 1,3 butadiene containing a stabilizer in a distillation device K4 to obtain a stream 15 as a bottom product, containing dried 1,3-butadiene, 1- und 2-butene and the stabilizer, and a stream 16 as the top product, containing an azeotropic 1,3-butadiene/water mixture, condensation of the stream 16 in a condenser W, transfer of the obtained condensate (stream 17) in a phase separation device, recycling of the upper liquid phase (stream 18) consisting of 1,3-butadiene as a return flow to column K4 and removal of the lower aqueous phase (stream 19), (a) reaction of stream 15 in a reactor R1 with hydrogen cyanide on at least one catalyst (stream 6a) to obtain stream 1, containing 3-pentenenitrile, 2-methyle-3-butenenitrile, the at least one catalyst, unreacted 1,3-butadiene, 1- and 2-butene and optionally any remaining unreacted hydrogen cyanide, (b) distillation of stream 1 in a distillation device K1 to obtain a stream 2 as a top product, containing the majority of the 1,3-butadiene from stream 1 and to obtain a stream 3 as a bottom product, containing 3- pentenenitrile, the at least one catalyst, 2-methyl 3-butenenitrile, 1- and 2-butene and the remainder of the 1,3 butadiene from stream 1 that was not separated in stream 2, c) distillation of the stream 3 in a distillation device K2 to obtain a stream 5 in a side-tap of the column, said stream containing 3- pentenenitrile and 2-methyl-3-butenenitrile, a stream 6 as bottom product, containing the at least one catalyst and a stream 4 as a top product, d) compression of stream 4 in the compressor V1, separation of a gaseous partial stream 4b containing 1-and 2-butene, transfer of the compressed stream 4a to the condenser W1, common condensation with stream 2 from b) and transfer of the condensate as stream 9, partially as a return flow to column K1 (stream 9b), partially as areturn stream in the reactor R1 (stream 9a) and e) separation of stream 5 by distillation to obtain 3- pentenenitrile and 2-methyl-3-butenenitrile.
Abstract:
Process for producing nickel(0)-phosphorus ligand complexes containing at least one nickel(0) central atom and at least one phosphorus-containing ligand, by reacting a nickel(II) compound with a reducing agent in the presence of the ligand to give a reaction mixture, characterized in that, a) in the reaction the molar ratio of reducing agent:nickel(II) compound is 1:1 to 1000:1, calculated as molar ratio of redox equivalents, b) in the reaction the molar ratio of phosphorus-containing ligand:nickel(II) compound is at most 30:1, calculated as molar ratio of P atoms:Ni atoms, c) in the resultant reaction mixture the nickel(0) content is at most 1.3% by weight, and d) the resultant reaction mixture is extracted by adding at least one dinitrile and at least one hydrocarbon, at least two immiscible phases forming.
Abstract:
Method for producing O-alkylated aminoalcohols by reacting N-unsubstituted or N-monosubstituted aminoalcoholates with alkyl halides, the aminoalcoholates being formed by means of alkali hydroxides or alkaline earth hydroxides.
Abstract:
The invention relates to a method for producing biphenols of general formula (I) by reacting monophenols of general formula (II), wherein the radicals R1, R2 and R3 independently represent hydrogen, alkyl, aryl or arylalkyl, with 1 - 10 C-atoms, in the presence of an oxidation agent in a reactor. Said method is characterised in that a) the reactor does not contain any stationary integrated components which act as a current agitator, b) a maximum of 0,6 mol of oxidation agents are used per mol of monophenol, and c) the oxidation agent is added in a continuous or discontinuous manner in a plurality of portions within a time span of between 10 min - 24 hours, whereby the amount of oxidation agent which is added per time unit is not constant over the entire tine span, but is varied.
Abstract:
The invention relates to a method for the isomerisation of pentenenitrile in an educt flow. Said isomerisation is carried out on a heterogeneous catalyst in a distillation column, such that during the isomerisation, the isomerisation educt is enriched by distillation in relation to the isomerisation product in the reaction column of the distillation column.
Abstract:
The invention relates to a method for producing 3-pentenenitrile by means of the hydrocyanation of 1,3-butadiene in the presence of at least one catalyst, the reaction being carried out in a loop-type bubble column comprising an external pumping circuit and a jet nozzle for driving the inner circulation.