Abstract:
A process for fractionating isobutene from normal butenes, including: introducing hydrogen and a feed stream comprising isobutene, 1-butene, and 2-butene into a first column including a reaction zone containing a hydroisomerization catalyst operating at a first pressure and concurrently: (i) converting at least a portion of the 1-butene to 2-butene, and (ii) separating isobutene from the 2-butene; recovering a first overheads fraction comprising isobutene from the first column; recovering a first bottoms fraction comprising isobutene, 2-butene, and unreacted 1-butene from the first column; introducing the first bottoms fraction into a top portion of a second column comprising a fractionation column operating at a second pressure lower than the first pressure; separating the first bottoms into a second overheads fraction comprising isobutene and 1-butene and a second bottoms fraction comprising 2-butene; compressing the second overheads fraction; and introducing the compressed second overheads fraction to a lower portion of the first column.
Abstract:
A process for the reduction of benzene in a gasoline stream, the process including: feeding a gasoline fraction including benzene and C6+ hydrocarbons and at least one of an alcohol and an ether to a catalytic distillation column comprising at least one reaction zone containing an alkylation catalyst, wherein the at least one reaction zone is above a gasoline fraction feed location; concurrently in the catalytic distillation column: separating the C6 hydrocarbons from C7+ hydrocarbons, wherein the C6 hydrocarbons and benzene distill upward into the at least one reaction zone; contacting benzene and the at least one of an alcohol and an ether in the at least one reaction zone in the presence of the alkylation catalyst to convert at least a portion of the benzene and alcohol /ether to an alkylate; recovering an overheads fraction including C6 hydrocarbons, any unreacted alcohol and ether, and water; and recovering a bottoms fraction including C7+ hydrocarbons and the alkylate.
Abstract:
A process for producing an alkylbenzene from an alkylphenyl alcohol comprising the steps of: (a) feeding a feed stream comprising alkylphenyl a reactor having a catalytic distillation zone; and, (b) concurrently in the reactor (i) contacting the feed stream comprising alkylphenyl alcohol with hydrogen in the catalytic distillation zone to convert alkylphenyl alcohol to alkylbenzene over a catalyst comprising Group VIII or a Group IB metal; and, (ii) separating alkylbenzene from the reaction mixture by fractional distillation to produce an overhead stream comprising alkylbenzene having a reduced concentration of alkylphenyl alcohol than the feed stream from the distillation column reactor. Examples of the alkylphenyl alcohol include cumyl alcohol, phenyl ethyl alcohol, or di(2-hydroxyl 2-propyl)benzene, and that for the alkylbenzene include cumene and diethyl benzene, or di(2-hydroxyl-2-propyl) benzene.
Abstract:
A process for the production of diisobutene is disclosed wherein tertiary butyl alcohol is dehydrated to isobutene in a distillation column reactor containing an acid cation exchange resin catalyst in the form of catalytic distillation structure. The isobutene reacts with itself in the presence of the catalyst to form primarily diisobutene which is removed as bottoms from the distillation column reactor with the bulk of the water. Unreacted isobutene along with an azeotrope of water is removed as overheads with the water being separated and removed from the unreacted isobutene. A portion or all of the unreacted isobutene may be returned to the distillation column reactor as reflux.
Abstract:
The invention relates to a method for producing polyamides, their oligomers or their mixtures, possibly with other reaction products, by reacting aminonitriles (A) and possibly other polyamide-forming monomers and/or oligomers with water (D) by reactive distillation. The reaction product (P) is extracted from the column bottom in the reactive distillation device and resulting ammonia (N), as well as possibly other resulting compounds having a low molecular weight, and water are withdrawn at the head of the column.
Abstract:
A process for selectively treating the components in a multi-component stream in a distillation column reactor (10). Additional catalytic distillation structures (12, 14) are placed as a secondary bed in the distillation column, either above or below the primary bed (12, 14), and the selected component withdrawn (4) after reaction in the primary bed to prevent its entry into the secondary bed.
Abstract:
The use of a catalyst package which can be produced by the vapour deposition and/or sputtering of at least one substance active as a catalyst and/or promotor on fabrics, knitted materials or foils as substrates in a catalytic distillation process in which a heterogeneous-catalytic reaction is combined with simultaneous distillation or rectification on the catalyst package.
Abstract:
A process for preparing aromatic carboxylic acids by the exothermic liquid-phase oxidation reaction of an aromatic feedstock compound, wherein energy is efficiently recovered from the exothermic oxidation reaction, particularly by the use of a high efficiency distillation column for the removal of the carboxylic acid solvent and by the use of an expander for energy recovery from the high pressure offgas.
Abstract:
In a process for concentrating liquid waste containing boron compounds and radionuclides, the liquid waste is evaporated to dryness to obtain a concentrate, alcohol is added in a further intermediate reaction to produce the boric acid ester, the other residues are separated and the residues containing radionuclides are disposed of.
Abstract:
A process for preparing methyl acetate of high purity at high reactant conversions. In this process glacial acetic acid is reacted with methanol to form methyl acetate and it is also used as an extractive agent for water and/or methanol. The glacial acetic acid is continuously reacted with at least a stoichiometric amount of methanol in a reaction zone in the presence of an acidic catalyst. A methyl acetate stream is continuously removed from the zone by distillation. The glacial acetic acid and methanol are countercurrently flowed into the reaction zone and the residence time of the reacting liquids in the zone is selected to permit the glacial acetic acid to function as an extractive agent for water and/or methanol. In operation, there is intimate contact between the glacial acetic acid and the methanol and also between the acid and azeotropes (methyl acetate/water and methyl acetate/methanol azeotropes) which form in the reaction zone. Such azeotropes are "broken" by extraction with the glacial acetic acid and also by the reaction of such acid with methanol in the methyl acetate/methanol azeotropes.