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WO/2002/014242A1 |
A process for the recovery of propane, propylene and heavier hydrocarbon components from a hydrocarbon gas stream is disclosed. The stream is cooled and/or expanded to partially condense it, then separated to provide a first vapor stream...
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WO/2001/098239A1 |
Methods for separating olefins from non-olefins, such as paraffins, including cycloparaffins, oxygenates and aromatics, are provided. The methods use metal salts to complex olefins, allowing the non-olefins to be separated by a variety o...
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WO/2001/085656A1 |
The invention relates to a method for treating a C¿4? fraction, comprising the following steps: extractive distillation (I), selective hydrogenation on a heterogeneous catalyst (II), a stream of crude 1,3-butadiene resulting from steps ...
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WO/2001/081504A2 |
The invention is a process for producing a mixture of wax and crude oil which can be pumped at ambient temperature. The wax is preferably a Fisher-Tropsch wax. The temperature of the crude oil is controlled to a level below the dissoluti...
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WO/2001/072671A1 |
A process for the selective hydrogenation of the methyl acetylene and propadiene (MAPD) in a propylene rich stream (101) is disclosed wherein the selective hydrogenation is carried out stepwise (a) first in a single pass fixed bed reacto...
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WO/2001/064609A1 |
A method for removing polymer from an acid gas treating system comprising contacting an acid containing stream with an aqueous alkanolamine solution and hydrocarbon solvent to form a mixture of an alkanolamine rich solution having the ac...
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WO/2001/064818A1 |
Process for the recovery of gaseous products from the product mixture obtained by contacting a hydrocarbon feed with a catalyst in a fluid catalytic cracking process, wherein the liquid, obtained by separating the top product of main fra...
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WO/2001/027054A1 |
The present invention provides an improved method for deep selective hydrogenation for use in recovering high purity olefins from cracked gas effluents or other paraffin/olefin gaseous mixtures by use of a chemical absorption process.
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WO/2001/009269A1 |
The invention relates to a method for cracking hydrocarbons, especially for producing olefins, whereby a mixture consisting of hydrocarbons and water vapor is heated in a cracking furnace up to a temperature ranging from 750 °C to 900 Â...
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WO/2001/005909A1 |
The feed mixture containing C¿4? to C¿8? olefins and water vapor is introduced with an entry temperature ranging from 300 to 700 °C into a reactor which contains a feed material comprised of a granular shape-selective zeolite catalyst...
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WO/2000/075263A1 |
Process to separate propene from gaseous fluid catalytic cracking products by performing the following steps: a) separating a feed mixture comprising the gaseous products, propene and other saturated and unsaturated hydrocarbons obtained...
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WO/2000/061528A1 |
A novel scheme for olefin recovery/separation based on the redox properties of metal dithiolene complexes is described. The complex, [1,2-bis(cyano)ethylene-1,2-dithiolato]nickel, [Ni(S¿2?C¿2?(CN)¿2?)¿2?], when generated electrochemi...
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WO/2000/044694A1 |
An inline, high-shear mixer (20) is provided in a cracked gas stream (12) upstream of a caustic tower (38) in an ethylene production unit. Spent caustic (52) is withdrawn from the bottom of the caustic tower (38) and pumped to the mixer ...
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WO/2000/031214A2 |
A system and process for the recovery of ethylene and propylene from a gas stream, such as a refinery offgas stream. The process comprises withdrawing, cooling, and recovering an overhead vapor stream from a single distillation column (2...
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WO/2000/026326A1 |
The invention relates to a process for the selective recovery of olefins from a mixture of gases, said process comprising: a) bringing a gaseous mixture comprising olefins and hydrogen into contact with silver nitrate solution whereby th...
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WO/2000/015735A1 |
A hydroprocessing process is disclosed which includes two hydroprocessing reaction stages represented by vessels (12) and (14), both of which produce a liquid and vapor effluent represented by lines (42) and (54), and a liquid vapor cont...
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WO/1999/059943A1 |
Processes using heterogeneous adsorbents are disclosed for purification of relatively impure unsaturated hydrocarbons such as olefins, which are typically produced by thermal cracking of suitable hydrocarbon feedstocks, by passing a feed...
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WO/1999/035110A1 |
A refrigeration system for an ethylene plant uses a low pressure demethanizer (12) and a binary refrigerant (20) comprising a mixture of methane and ethylene or methane and ethane. The refrigeration composition may be constant throughout...
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WO/1999/031201A1 |
A process for recovering olefins from a gas stream containing olefins and hydrogen. The process comprises compressing the gas stream in at least one compression stage to form a compressed gas stream, contacting the compressed gas stream ...
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WO/1999/015485A1 |
Selective hydrogenation of a feed gas stream containing at least 10 % by volume of hydrogen, ethylene and a total of 4000 to 15000 ppm by volume of hydrocarbons containing 2 to 4 carbon atoms that are more highly unsaturated than mono-ol...
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WO/1999/009118A1 |
In an olefins plant for the production and recovery of ethylene and propylene, the hydrogenation of the C¿2? acetylenes, the C¿3? acetylenes and dienes and the C¿4? and heavier acetylenes, dienes and olefins and the selective separati...
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WO/1999/007655A1 |
Gases and liquid products (78) of the cracking zone of an ethylene production plant are fractionated in a demethanizer (80) to form a dilute ethylene stream (53) containing about 5 to 40 percent of the ethylene contained in the feed. The...
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WO/1998/041597A1 |
Alkines, dienes, and/or singly unsaturated hydrocarbons; compounds containing sulphur, arsenic and/or antimony; oxygen, hydrogen and/or carbon monoxide are removed from material flows in a total of at most three process steps. In a first...
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WO/1998/040450A1 |
Processes using heterogeneous adsorbents are disclosed for purification of olefins such as are typically produced by thermal cracking of suitable hydrocarbon feedstocks, by passing a steam of olefin having from 2 to about 8 carbon atoms,...
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WO/1998/037169A1 |
The C�2? to C�5? and heavier acetylenes and dienes in a thermally cracked feed stream are hydrogenated without significantly hydrogenating the C�2? and C�3? olefins. Additionally, the C�4? and heavier olefins may be hydrogenate...
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WO/1998/029366A1 |
The invention relates to a process for the production of a secondary ethylene stream (10) from a pressurised mixed olefin bearing charge gas (4) as the overhead of one fractional distillation tower (2) contained in an overall olefin reco...
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WO/1998/025871A1 |
The present invention provides an improved method for recovering high purity olefins from cracked gas effluents or other paraffin/olefin gaseous mixtures by use of a chemical absorption process.
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WO/1998/017743A1 |
A method and apparatus for processing fluid catalytic cracking (FCC) product gases is described. The method deacidifies the wet gas from the FCC fractionation column (10) before it is compressed for further processing thereby reducing th...
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WO/1998/012160A1 |
A process for the removal of vinylacetylene, ethylacetylene and 1,2-butadiene from C�4? aliphatic hydrocarbon streams comprising, concurrently: (1) feeding hydrogen and a hydrocarbon stream comprising C�4? hydrocarbons including buta...
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WO/1997/033953A1 |
In an olefins plant for the production and recovery of ethylene and propylene, the hydrogenation of the C2 acetylene, the C3 acetylenes and dienes and the C4 and heavier acetylenes, dienes and olefins and the selective separation of the ...
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WO/1997/028110A1 |
A process for the separation of propylene from an input stream of C3 hydrocarbons containing propylene, possibly C4 and/or higher hydrocarbons, and MAPD (methyl acetylene and/or propadiene), comprises subjecting said input steam to fract...
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WO/1997/003934A1 |
The invention is a process for reducing capital and energy costs in ethylene recovery. Moderate pressure processing and thermally coupled fractionation steps are achieved through the use of the integrator columns. Ethylene separation fro...
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WO/1996/040604A1 |
A process for the recovery of propane, propylene and heavier hydrocarbon components from a hydrocarbon gas stream is disclosed. The stream is cooled and/or expanded to partially condense it, then separated to provide a first vapor stream...
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WO/1996/035501A1 |
The present invention provides a large number of inhibiting agents that are useful to reduce aldol condensation in monoethanolamine scrubbers. Such agents include hydrazine, hydroperoxides, hydrogen peroxide, and dialkylketone oximes. Pr...
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WO/1996/034227A1 |
The present invention relates to a hydrocarbon product and to a method and a plant for manufacturing same. The invention in particular relates to a method and a plant for manufacturing a new hydrocarbon product in the form of a suspensio...
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WO/1996/017902A1 |
Petroleum wax feeds having a low oil content are converted to high viscosity index lubricants by a two-step hydrocracking-hydroisomerization process in which the wax feed is initially subjected to hydrocracking under mild conditions with...
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WO/1996/006900A1 |
The invention relates to a process to selectively hydrogenate di-olefinically, poly-olefinically, and acetylenically unsaturated hydrocarbon components a C2 to C5+ or a C3 to C5+ fraction of a cracked hydrocarbon stream. The process comp...
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WO/1995/015934A1 |
A process for the selective hydrogenation of the diolefins and acetylenic compounds in an olefin-rich aliphatic hydrocarbon stream (1) comprises contacting the feed stream (1) at 40-300 �F under low hydrogen partial pressure of 0.1-70 ...
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WO/1995/015365A1 |
Compensation for catalyst activity decline in multi-bed selective hydrogenation of acetylenes in the presence of olefins by providing inter-bed heating so that the product from the first bed is heated before it is fed to the second bed, ...
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WO/1995/013511A1 |
A process for separating a hydrocarbon mixture containing an alkene, a corresponding alkane having the same number of carbon atoms as the alkene and at least one heavier hydrocarbon component comprises the steps of: a) feeding the hydroc...
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WO/1994/013757A1 |
The invention concerns a method of obtaining, from the cracked gases emerging from a steam cracker, a polymerizable fraction of recyclable material consisting of styrene, methylstyrenes, vinyltoluenes, indene, methylindenes and fractions...
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WO/1994/010264A1 |
A hydrocarbon feedstock (10) is cracked (12), and then the cracker product is compressed (18) and separated (20) into various hydrocarbon fractions including a stream containing hydrocarbons more highly unsaturated than mono-olefins (30)...
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WO/1994/010265A1 |
Recovering olefins from cat-cracked gases without the accumulation of dangerous amounts of nitrogen oxides is achievable in a safe, effective, and economical manner by conducting the recovery at temperatures that are high enough to preve...
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WO/1994/006890A1 |
A process flow sequence for the reduction of polymer fouling while maintaining efficient production levels wherein a dual pressure, dual column configuration is used to effect the reduction in polymer fouling. The dual pressure, dual col...
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WO/1994/004477A1 |
A process for the selective hydrogenation of the diolefins and acetylenic compounds in a propylene rich stream is disclosed wherein the selective hydrogenation is carried out in a distillation column reactor containing a supported PdO hy...
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WO/1993/024428A1 |
The invention concerns a method for the production of light C¿2+?-hydrocarbons, in particular ethylene and ethane, from cracked gas, in particular from a gas produced by a fluid catalytic cracking process. The invention proposes that th...
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WO/1993/023499A1 |
A process for removing acetylene from a hydrocarbon stream comprises exposing the stream to a hydrogenation catalyst in the presence of an acetylene converter modifier which substantially remains on the catalyst and does not unsubstantia...
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WO/1993/017081A1 |
Contacting an olefins-containing feed gas stream in a front-end heat-pumped deethanizer or depropanizer to remove the C3+ or C4+ compounds, selectively hydrogenating the overhead stream to significantly reduce the acetylene and diolefins...
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WO/1993/013850A1 |
A process for recovering hydrogen from a cracking effluent (11) wherein a cracking effluent (11) is compressed (12, 18, 24, 30, 38, etc.), and then at least a portion of the hydrogen is separated from the cracking effluent prior to cooli...
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WO/1993/003115A1 |
The impurity content, e.g. propionitrile, in a fraction containing C5 or C6 tertiary olefins obtained by cracking hydrocarbons is reduced by distilling with an alkanol and removing the impurity as a higher boiling point fraction.
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