The disclosure relates to a selective head-to-head dimerization of conjugated diene compounds by a catalytic process in a reaction medium without solvent or with solvent comprising hydrocarbons, in the presence of a specific additive of the phenol type.

The disclosure relates to a selective head-to-head dimerization of conjugated diene compounds by a catalytic process in a reaction medium without solvent or with solvent comprising hydrocarbons, in the presence of a specific additive of the phenol type.

The disclosure relates to a selective head-to-head dimerization of conjugated diene compounds by a catalytic process in a reaction medium without solvent or with solvent comprising hydrocarbons, in the presence of a specific additive of the phenol type.

Methods and systems for producing carbon-negative hydrogen and renewable natural gas from biomass are included herein. In an embodiment, the method may include gasifying biomass in a gasification unit to form a first stream comprising syngas. The syngas may include methane, hydrogen, carbon dioxide, carbon monoxide, ethylene, and water. The method may also include reacting the carbon monoxide with water in the presence of a catalyst to form a second stream. The second stream may include a greater hydrogen concentration than the first stream. The method may further include separating at least a portion of the second stream to form a hydrogen stream and a natural gas stream. The hydrogen stream may have a greater concentration of hydrogen than the second stream. The natural gas stream may have a greater concentration of methane than the second stream.

Methods and systems for producing carbon-negative hydrogen and renewable natural gas from biomass are included herein. In an embodiment, the method may include gasifying biomass in a gasification unit to form a first stream comprising syngas. The syngas may include methane, hydrogen, carbon dioxide, carbon monoxide, ethylene, and water. The method may also include reacting the carbon monoxide with water in the presence of a catalyst to form a second stream. The second stream may include a greater hydrogen concentration than the first stream. The method may further include separating at least a portion of the second stream to form a hydrogen stream and a natural gas stream. The hydrogen stream may have a greater concentration of hydrogen than the second stream. The natural gas stream may have a greater concentration of methane than the second stream.

The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the fraction comprising ethane and/or propane (12) from the cracking effluent is sent at least partly into a steam cracking furnace (19), fed with steam (20), to produce a steam cracking effluent (21) comprising ethylene and/or propylene.

The present invention relates to an NCC process and an apparatus for producing light olefins and aromatics, wherein the fraction comprising ethane and/or propane (12) from the cracking effluent is sent at least partly into a steam cracking furnace (19), fed with steam (20), to produce a steam cracking effluent (21) comprising ethylene and/or propylene.

The invention relates to a process for the manufacture of diesel range hydrocarbons wherein a feed is hydrotreated in a hydrotreating step and isomerised in an isomerisation step, and a feed comprising fresh feed containing more than 5 wt % of free fatty acids and at least one diluting agent is hydrotreated at a reaction temperature of 200-400° C., in a hydrotreating reactor in the presence of catalyst, and the ratio of the diluting agent/fresh feed is 5-30:1.

The invention relates to a process for the manufacture of diesel range hydrocarbons wherein a feed is hydrotreated in a hydrotreating step and isomerised in an isomerisation step, and a feed comprising fresh feed containing more than 5 wt % of free fatty acids and at least one diluting agent is hydrotreated at a reaction temperature of 200-400° C., in a hydrotreating reactor in the presence of catalyst, and the ratio of the diluting agent/fresh feed is 5-30:1.

A nonlimiting example method for producing a diesel boiling range composition comprises: oligomerizing an ethylene stream to a C4+ olefin stream in a first olefin oligomerization unit, wherein the C4+ olefin stream contains no greater than 10 wt% of methane, ethylene, and ethane combined in a first oligomerization; and wherein the ethylene stream contains at least 50 wt% ethylene, at least 2000 wppm ethane, no greater than 1000 wppm of methane, and no greater than 20 wppm each of carbon monoxide and hydrogen; oligomerizing the C4+ olefin stream and a propylene/C4+ olefin stream in a second oligomerization unit to produce an isoolefinic stream; wherein at least a portion of the isoolefinic stream is used to create the diesel boiling range composition.