Abstract:
A process for the co-production of a stream of a fatty alcohol having first carbon chain lengths and a stream of a fatty alcohol having a second carbon chain lengths, said second carbon chain lengths being longer than said first carbon chain lengths, said process comprising the steps of: (a) supplying a stream comprising lower alkyl esters of fatty acids having chain lengths comprising the first and second chain lengths to a first vaporisation zone and contacting said stream with an amount of hydrogen recycled from step (i) which is sufficient to vaporise the lower alkyl esters of the fatty acids having the first carbon chain lengths into the hydrogen; (b) supplying the hydrogen and the vaporised lower alkyl esters of fatty acids having the first carbon chain lengths to a first reaction zone comprising catalyst and operating under reaction conditions to allow hydrogenation to the desired alcohol having first carbon chain lengths; (c) recovering from the first reaction zone an alcohol product stream having first carbon chain lengths and the hydrogen; (d) supplying the unvaporised lower alkyl esters of the fatty acids having second carbon chain lengths remaining from step (a) to a second vaporisation zone; (e) contacting the unvaporised lower alkyl esters having second carbon chain lengths in the second vaporisation zone with an amount of hydrogen sufficient to vaporise the lower alkyl esters having fatty acids of the second carbon chain lengths into the hydrogen; (f) supplying the hydrogen and the vaporised lower alkyl esters of fatty acids having second carbon chain lengths to a second reaction zone comprising catalyst and operating under reaction conditions to allow hydrogenation to the desired alcohol having second carbon chain lengths; (g) recovering from the second reaction zone an alcohol product stream having second carbon chain lengths and hydrogen; (h) separating the stream of fatty acid alcohol having the second carbon chain length from hydrogen; and (i) recycling a portion of the hydrogen recovered in step (h) to the first vaporisation zone and a portion to the second vapourisation zone.
Abstract:
A tube supporting device is described which in a preferred embodiment comprises ferrules (1) located on the tubes (2), brace means (3) connecting the ferrules (1) and cleats (7) connecting rows of tubes (2). The brace means (3) may be held in position by means of a retaining band (8) which itself is located in position by a stave (9). The support structure is capable of being assembled as the tube bundle is assembled.
Abstract:
A process for the production of N-alkylpyrrolidone from γ-butyrolactone and monoalkylamine in the liquid phase comprising the steps of: feeding monoalkylamine and γ-butyrolactone, in the absence of water or in the presence of less than about 1 wt % of water, to a reaction zone to form a reaction mixture; heating the reaction mixture; withdrawing a product stream from the reaction zone and passing the stream to a distillation zone comprising at least one distillation column operated at sub-atmospheric pressure; adding water to the distillation zone; isolating at least one overhead stream from the distillation zone comprising monoalkylamine, water and optionally N-alkyl-pyrrolidone and condensing the overhead stream against cooling water.
Abstract:
A process for the production of carboxylic acid esters by reaction of a carboxylic acid selected from mono-, di- and polycarboxylic acids, with an alcohol in the presence of water of solution comprising the steps of: (a) providing a solution comprising the carboxylic acid and the water of solution; (b) reacting the solution of the carboxylic acid in an esterification zone with an alcohol to form an ester and water of esterification; (c) removing the water of solution and the water of esterification; and (d) recovering the ester.
Abstract:
The present invention relates to a continuous hydroformylation process for the production of an aldehyde by hydroformylation of an olefin which comprises: providing a hydroformylation zone containing a charge of a liquid reaction medium having dissolved therein a rhodium hydroformylation catalyst comprising rhodium in combination with carbon monoxide and a ligand; supplying the olefin to the hydroformylation zone; maintaining temperature and pressure conditions in the hydroformylation zone conducive to hydroformylation of the olefin; recovering from the liquid hydroformylation medium a hydroformylation product comprising aldehyde; recovering from the hydroformylation zone a stream comprising the rhodium catalyst; contacting at least a portion of the stream with a solid acidic absorbent under process conditions which allow at least some of the rhodium to become bound to the absorbent; subjecting the rhodium bound to the absorbent, under process conditions which allow desorption of the metal, to a fluid stripping medium comprising hydrogen and solvent; recovering the rhodium hydride catalyst; and recycling the rhodium hydride catalyst to the hydroformylation zone.
Abstract:
A process is described for the production of ethers, typically terahydrofuran, by reaction of a corresponding organic feed material selected from dicarboxylic acids and/or anhydrides, monoesters of dicarboxylic acids and/or anhydrides, diesters of dicarboxylic acids and/or anhydrides, lactones, and mixtures of two or more thereof in the presence of hydrogen which comprises the steps of: (a) supplying a stream comprising the organic feed material to a first vaporisation zone and contacting said feed with cycle gas comprising hydrogen such that at least a portion of the feed material is vaporised by and into the cycle gas; (b) supplying at least a portion of the cycle gas and the vaporised feed material to a first reaction zone comprising catalyst and operating under reaction conditions to allow hydrogenation and dehydration to occur; (c) recovering from the first reaction zone an intermediate product stream comprising unreacted feed material, cycle gas, desired product(s), and any co-products and by-products; (d) supplying the intermediate product stream to a second vaporisation zone and contacting it with additional feed material such that the said additional feed material is vaporised by and into the intermediate product stream; (e) supplying the product of step (d) to a subsequent reaction zone comprising catalyst and operating under reaction conditions to allow hydrogenation and, if required, dehydration to occur; and (f) recovering from the subsequent reaction zone a product stream comprising the ether.
Abstract:
An aldolisation process is disclosed for converting an aldehyde or mixture of aldehydes, such as iso-butyraldehyde and formaldehyde, to a desired polyhydroxy alcohol or glycol, such as neopentyl glycol. Aldolisation is effected in a stirred tank reactor using an alkali catalyst, such as sodium hydroxide. An aldolisation intermediate product is converted to the desired polyhydroxy alcohol or glycol by a hydrogenation or cross-Cannizzaro reaction step. The product is recovered and an aqueous catalyst-containing phase is recycled to the aldolisation zone. At least a portion of this catalyst recycle stream is purged to control the build up of cross-Cannizzaro products in the recycle stream. The purge stream is treated electrolytically to obtain an aqueous catalyst-containing solution for recycle to the aldolisation zone and an effluent stream comprising volatile organic materials and being substantially free from alkali catalyst.
Abstract:
The present invention relates to a process for recovery of homogeneous metal hydride catalyst from a reactor stream as catalyst suitable for recycle to a reactor comprising the steps of: removing a stream from a reactor, said stream comprising the homogeneous metal hydride catalyst; contacting the stream with a solid acidic absorbent under process conditions which allow at least some of the metal to become bound to the absorbent; subjecting the metal bound to the absorbent, under process conditions which allow desorption of the metal, to a fluid stripping medium comprising hydrogen and solvent; and recovering the active metal hydride catalyst.
Abstract:
A monolith catalyst carrier for insertion in a tube of a tubular reactor has a container for holding a monolith catalyst in use. The container has a bottom surface closing the container and a skirt extending upwardly from the bottom surface of the container to a position below the location of a seal and spaced therefrom. The skirt is positioned such that there is a space between an outer surface of the monolith catalyst and the skirt. A seal is located at or near a top surface of the monolith catalyst and extends from the monolith catalyst by a distance which extends beyond an outer surface of the skirt.
Abstract:
In a process for converting synthesis gas to higher hydrocarbons in a tubular reactor, reactants are introduced through an inlet of the reactor. The reactants are passed downwardly through at least one tube to an upper surface of a catalyst carrier where they pass into a passage defined by an inner perforated wall of a catalyst container before passing radially through the catalyst bed towards the perforated outer wall. Reaction occurs as the synthesis gas contacts the catalyst. Unreacted reactant and product is passed out of the container through a perforated outer wall thereof and then upwardly between a skirt and an outer wall of the container, followed by being directed over the end of the skirt and downwardly between the skirt and the reactor tube where heat transfer takes place. These steps are repeated for any subsequent catalyst carrier, then product is removed from an outlet of the reactor.