Abstract:
The invention relates to a method for dealkylating alkyl-substituted aromatic hydrocarbons with the aid of water vapour in the presence of a dealkylation catalyst, by means of a gas containing oxygen.
Abstract:
The production of alkylaryl compounds comprises the following stages: a) reaction of a C4/C5 olefin mixture on a metathesis catalyst to produce a C 4-8 olefin mixture containing 2-pentene and the optional isolation of the C 4-8 olefin mixture; b) isolation of between 5 and 100 % of the 2-pentene obtained in step a) and subsequent reaction on an isomerisation catalyst to form a mixture of 2-pentene and 1-pentene, which is returned to stage a); c) dimerisation of the C 4-8 olefin mixture obtained in stage b) after the isolation process, to form a mixture containing C 8-16 olefins, isolation of the C 8-16 olefins and optional isolation of a partial stream of the latter; d) reaction of the C 8-16 olefin mixtures obtained in stage c) or the partial stream with an aromatic hydrocarbon in the presence of an alkylation catalyst, to form alkyl aromatic compounds, whereby prior to the reaction an additional 0 to 60 wt. % linear olefins, in relation to the C 8-16 olefin mixtures obtained in stage c), can be added; e) optional sulphonation of the alkyl aromatic compounds obtained in stage d) and neutralisation to form alkylaryl sulphonates, whereby prior to the sulphonation an additional 0 to 60 wt. % linear alkyl benzols, in relation to the alkyl aromatic compounds obtained in stage d), can be added, provided that there were no admixtures in stage d); f) optional mixing of the alkylaryl sulphonates obtained in stage e) with between 0 and 60 wt. %, linear alkylaryl sulphonates, in relation to the alkylaryl sulphonates obtained in stage e), provided that there were no admixtures in stages d) and e).
Abstract:
The invention relates to a method for continually producing 1,3-dioxolan-2-ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in liquid phase in the presence of a catalyst. The reaction is carried out in a two-part reactor. In the first part of the reactor, the reaction is carried out with back-mixing until a conversion rate of oxirane II of at least 80 % has been reached. In the second part, the reaction is completed under conditions without back-mixing, the carbon dioxide being guided to the oxirane II in a counterflow throughout the reactor.
Abstract:
The invention relates to a method for producing alkyl aromatic compounds by reacting C3-30 olefins or alcohols, from which C3-30 olefins are formed under the reaction conditions, with an aromatic hydrocarbon in the presence of an alkylation catalyst. The reaction is carried out in a reactor cascade consisting of at least two reactors, whereby each of the reactors contain the alkylation catalyst, at least 80 % of the aromatic hydrocarbon is fed into the first reactor of the reactor cascade, and at least 40 % of the olefins are fed in an intermediate manner after the first reactor.
Abstract:
The invention relates to a method for producing alkylaryl sulfonates, the alkylaryl sulfonates obtained according to said method, alcohol mixtures and olefin mixtures obtained as intermediate products, alkylaromatic compounds obtained therefrom, the use of said alkylaryl sulfonates as surfactants, and detergents containing said surfactants.
Abstract:
A reactor (1) having a vertical longitudinal axis and an inlet (2) for a liquid or liquid/solid feed stream in the upper region of the reactor and an inlet (3) for a gaseous stream in the lower region of the reactor (1), characterized by at least two chambers (4) arranged above one another in the longitudinal direction, where the chambers (4) are separated from one another by liquid-tight bottom plates, each chamber is connected via a liquid overflow (6) to the chamber (4) located immediately underneath and a liquid product stream is taken off via the liquid overflow (6) of the bottommost chamber (4), the gas space (7) above the liquid surface in each chamber (4) is connected to the chamber (4) located immediately above it by one or more guide tubes (8) which opens (each open) into a gas distributor (9) provided with openings for exit of gas below the liquid surface, and each chamber is provided with at least one guide plate (12) which is arranged vertically around each siphon like gas distributor (9) and whose upper end is below the liquid surface and whose lower end is above the liquid-tight bottom plate (5) of the chamber (4) and which divides each chamber (4) into one or more spaces into which gas flows (13) and one or more spaces into which gas does not flow (14), is used for gas/liquid or gas/liquid/solid reactions.
Abstract:
The invention relates to a method for continually producing 1,3-dioxolan-2- ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in liquid phase in t he presence of a catalyst. The reaction is carried out in a two-part reactor. In the first part of the reactor, the reaction is carried out with back-mixing until a conversion rate of oxirane II of at least 80 % has been reached. In the second part, the reaction is completed under conditions without back-mixing, the carbon dioxide being guided to the oxirane II in a counterflow throughout the reactor.
Abstract:
Production of alkylaromatic compounds (I), by reacting 3-30C olefins (II) (or alcohols forming (II) under the reaction conditions) with aromatic hydrocarbons (III) in presence of an alkylation catalyst (IV), is carried out in a cascade of at least two reactors each containing (IV), where at least 80 % of (III) is supplied to the first reactor of the cascade and at least 40 % of (II) is supplied after the first reactor. An independent claim is included for the preparation of alkylarylsulfonates (A), by: (1) converting a 4C olefin mixture over a metathesis catalyst to give an olefin mixture containing 2-pentene and/or 2-hexene; (2) catalytically dimerizing the 2-pentene and/or 2-hexene (optionally after isolation) to give a mixture containing 10-12C olefins, optionally separating the 10-12C olefins and separating 5-30 wt. % (based on the 10-12C olefins) of low-boiling components of the 10-12C olefins; (3) reacting the obtained 10-12C olefin mixture with (III) in presence of (IV) to give alkylaromatic compounds (I'), optionally with addition of 0-60 wt. % (based on the 10-12C olefin mixture) of linear olefins before the reaction; (4) sulfonating (I') and neutralizing to give (A), optionally with addition of 0-60 wt. % (based on (I')) of linear alkylbenzenes (provided that no mixing has been carried out in the previous step); and (5) optionally mixing the obtained (A) with optionally with addition of 0-60 wt. % (based on (A)) of linear aralkylsulfonates (provided that no mixing has been carried out either of the previous two steps); The novel feature being that the reaction in the alkylation stage (3) is carried out as for the present procedure for preparing (I).