摘要:
The invention relates to a method for dehydrating alkanes, wherein the alkane is guided in a reactor for the dehydrogenation of alkanes via a catalyst, and the process may be carried out adiabatically or non-adiabatically, and the catalyst for dehydration can be regenerated after the reaction phase by means of transferring a gas, wherein said gas is guided via the catalyst after a short rinsing phase using water vapor, and said regeneration gas consists of a gas containing oxygen and of steam, and after regeneration the catalyst is freed of the gas containing oxygen by transferring steam, wherein the duration of the transfer of a gas containing oxygen is significantly reduced as compared to common methods and represents 70% or less of the total regeneration time, and the catalyst has an increased selectivity for forming alkene by means of carrying out the regeneration at a constant activity, and the catalyst is comprised of a metal of the group of platinum metals or group VIB of the periodic table of the elements, which is applied to a carrier in form of a compound or in elementary form, which substantially consists of oxides of the elements of tin, zinc, or aluminum.
摘要:
A process for the dehydrogenation of alkanes. In several reactors of the adiabatic, allothermal or isothermal type or combinations thereof a gaseous alkane-containing material stream is passed through a catalyst bed in continuous operating mode. The gas stream produced contains an alkene, hydrogen and a non-converted alkane. In order to achieve a constant product composition, at least one of the process parameters of temperature, pressure or steam/hydrocarbon ratio is recorded in the form of measured values at one or several points of at least one of the reactors, where at least one of the process parameters is selectively controlled and influenced such that the composition of the product gas at the outlet of one reactor remains constant throughout the operating period.
摘要:
The invention relates to a method for dehydrating alkanes, wherein the alkane is guided in a reactor for the dehydrogenation of alkanes via a catalyst, and the process may be carried out adiabatically or non-adiabatically, and the catalyst for dehydration can be regenerated after the reaction phase by means of transferring a gas, wherein said gas is guided via the catalyst after a short rinsing phase using water vapor, and said regeneration gas consists of a gas containing oxygen and of steam, and after regeneration the catalyst is freed of the gas containing oxygen by transferring steam, wherein the duration of the transfer of a gas containing oxygen is significantly reduced as compared to common methods and represents 70% or less of the total regeneration time, and the catalyst has an increased selectivity for forming alkene by means of carrying out the regeneration at a constant activity, and the catalyst is comprised of a metal of the group of platinum metals or group VIB of the periodic table of the elements, which is applied to a carrier in form of a compound or in elementary form, which substantially consists of oxides of the elements of tin, zinc, or aluminum.
摘要:
A catalyst for the dehydrogenation of alkanes or alkyl substituents of hydrocarbons, is a shaped body having at least one oxide from the elements of the main or secondary group II to IV of the periodic table or of a mixed oxide thereof serving as base material of the shaped body. The catalyst further contains an additional constituent which is an oxide of an element of the main group IV of the periodic table, added during the shaping process. A platinum compound and a compound of an element of the main group IV of the periodic table is used as a surface constituent of the catalyst. The invention further relates to the production of the catalyst and to a method for the dehydrogenation of alkanes using the catalyst.
摘要:
The invention relates to a material which is suited as a carrier for catalysts in the dehydrogenation of alkanes and in the oxidative dehydrogenation of alkanes and which is made of an oxide ceramic foam and may contain combinations of the substances aluminium oxide, calcium oxide, silicon dioxide, tin oxide, zirconium dioxide, calcium aluminate, zinc aluminate, silicon carbide, and which is impregnated with one or several suitable catalytically active materials, by which the flow resistance of the catalyst decreases to a considerable degree and the accessibility of the catalytically active material improves significantly and the thermal and mechanical stability of the material increases. The invention also relates to a process for the manufacture of the material and a process for the dehydrogenation of alkanes by using the material according to the invention.
摘要:
The invention relates to a method for producing unsaturated hydrocarbons. According to said method, in a first step, a hydrocarbon, especially a mixture which contains alkanes, essentially no water, and can contain water vapour, is continuously guided through a first catalyst bed provided with standard dehydration conditions. Liquid water, water vapour and a gas containing oxygen are then added to the reaction mixture obtained in the first step and, in a second step, the reaction mixture obtained is then continuously guided through another catalyst bed for oxidising hydrogen and for further dehydrating hydrocarbons. The first catalyst bed can be heated and the heating in the first step is then preferably regulated in such a way that an essentially isothermic operating mode is created.
摘要:
The invention relates to a method for producing unsaturated hydrocarbons. According to said method, in a first step, a hydrocarbon, especially a mixture which contains alkanes, essentially no water, and can contain water vapour, is continuously guided through a first catalyst bed provided with standard dehydration conditions. Liquid water, water vapour and a gas containing oxygen are then added to the reaction mixture obtained in the first step and, in a second step, the reaction mixture obtained is then continuously guided through another catalyst bed for oxidising hydrogen and for further dehydrating hydrocarbons. The first catalyst bed can be heated and the heating in the first step is then preferably regulated in such a way that an essentially isothermic operating mode is created.
摘要:
The invention relates to a process and a device for an as constant as possible supply of steam flow from an alkane dehydrogenation, the process being carried out by passing a hydrocarbonaceous gas through reaction tubes loadable with a catalyst, and the reaction tubes, which are sealed towards the outside, running through a heating chamber which is heatable by means of burners, and the catalyst being regenerated for the reaction in a cyclic operating mode, in which the reaction is endothermic and the regeneration of the catalyst non-endothermic, and the capacity of the main burners is reduced during the regeneration of the catalyst, in which auxiliary burners, which serve to keep up the production of hot flue gas during the regeneration of the catalyst, are installed at the inlet of the flue gas duct to produce additional hot flue gas which is used for generating an as constant as possible amount of steam from the waste heat of the process.
摘要:
A process for joint entrained-bed gasification of ash-containing solid fuels and liquid fuels which are fed separately of each other to the coal gasification reactor via several burners, said burners having a concentric firing angle of greater than 0 degree such that soot formation is reduced and the conversion efficiency is increased, and the solid is conveyed to the gasification reactor together with an inert gas, and at least part of the ash-containing solid fuel contains fine coal particles which originate from coal mining and are not suited for fixed-bed gasification, and the liquid ash-containing fuel contains residues from a fixed-bed gasification.
摘要:
With a method for supplying an entrained-flow gasification reactor with carbonaceous fuel for the production of a gas that contains CO and H2 and flue ash under pressure and at a temperature above the melting point of the ash, wherein the resulting gas is passed to further treatment stages, particularly at least one synthesis stage, the yield of the liquid products is supposed to be increased in cost-advantageous and simple manner.This is achieved in that the waste gas that is derived from the subsequent treatment stage and still contains hydrocarbons and/or hydrogen is used for pneumatic conveying of the fuel into the entrained-flow gasification reactor.