In a Fluid Catalytic Cracker (FCC) unit being operated in petrochemical mode that has an increased dry gas and LPG production that creates a bottleneck in product flow, a method for full or partial separation of light gas components from a wet gas compressor suction stream and routing it directly to an untreated fuel gas header using a parallel system to an existing wet gas compressor, which parallel system includes an auxiliary compressor and a membrane separation system.

Processes and systems for quenching an effluent. In certain embodiments, the process can include contacting a pyrolysis effluent and a first quench medium to produce a first quenched effluent. A bottoms stream that can include tar and an overhead stream that can include ethylene and propylene can be obtained from the first quenched effluent. The first quench medium can include a first portion of the bottoms stream that can include a first portion of the tar. In certain embodiments, the process can also include hydroprocessing a second portion of the bottoms stream that can include a second portion of the tar to produce a hydroprocessed product. A hydroprocessed bottoms stream can be obtained from the hydroprocessed product. In certain embodiments, the process can also include contacting at least a portion of the hydroprocessed bottoms stream and the first portion of the bottoms stream to produce the first quench medium.

Processes and systems for quenching an effluent. In certain embodiments, the process can include contacting a pyrolysis effluent and a first quench medium to produce a first quenched effluent. A bottoms stream that can include tar and an overhead stream that can include ethylene and propylene can be obtained from the first quenched effluent. The first quench medium can include a first portion of the bottoms stream that can include a first portion of the tar. In certain embodiments, the process can also include hydroprocessing a second portion of the bottoms stream that can include a second portion of the tar to produce a hydroprocessed product. A hydroprocessed bottoms stream can be obtained from the hydroprocessed product. In certain embodiments, the process can also include contacting at least a portion of the hydroprocessed bottoms stream and the first portion of the bottoms stream to produce the first quench medium.

The present invention relates to a novel process of an absorption and stabilization unit, comprising operation steps of: sS1, primary compression of rich gas, S2, secondary compression of rich gas, S3, dry gas absorption, S4, gasoline stabilization, and so on. After rich gas from a catalytic fractionation unit undergoes operations such as primary compression, rectification using a de-heavy fractionator, and secondary compression, the gas phase mainly composed of C3 from the top of the de-heavy fractionator and naphtha from the catalytic fractionation unit are absorbed in an absorption tower, and dry gas of unabsorbed components is discharged from the top of the absorption tower; rich-absorption oil from the bottom of the absorption tower and the liquid phase mainly composed of C4 from the bottom of the de-heavy fractionator enter an stabilization tower to perform stable operation. The novel process of the absorption and stabilization unit of the present invention can obviously reduce the energy consumed by the absorption and stabilization unit by means of step-by-step compression, and facilitates further utilization of products from the absorption and stabilization unit. The present invention also relates to a method for comprehensive utilization of products from the absorption and stabilization unit, for maximizing the conversion of effective components in stabilized gasoline, liquefied gas, and dry gas after the novel absorption and stabilization process into high value-added chemical products such as propylene.

A process and system for integrating a steam cracking unit with a blue hydrogen unit in which a methane-rich gas stream, a hydrogen-rich gas stream, or both from the steam cracking unit are fed to the blue hydrogen unit and a high purity hydrogen gas stream from the blue hydrogen unit is directed to the steam cracking unit.

A process and system for integrating a steam cracking unit with a blue hydrogen unit in which a methane-rich gas stream, a hydrogen-rich gas stream, or both from the steam cracking unit are fed to the blue hydrogen unit and a high purity hydrogen gas stream from the blue hydrogen unit is directed to the steam cracking unit.

A process for separating a mixed or raw gas feed to produce a dry gas product and a hydrocarbon liquid product is provided. The process comprises scrubbing heavier hydrocarbon components from the gas feed to produce a lighter ends gas stream and a heavier ends liquid stream; cooling the lighter ends gas stream and separating the cooled lighter ends gas stream into a cold liquid stream and the dry gas product; and using the cold liquid stream to assist in scrubbing the heavier hydrocarbon components from the gas feed.

This invention concerns a method for recovering carbon monoxide and carbon dioxide from Fischer-Tropsch off-gas by feeding Fischer-Tropsch off-gas through a column comprising an adsorbent bed, and discharging effluent, optionally rinsing the column and the adsorbent bed by feeding carbon dioxide and discharging effluent until at least 60% of the carbon monoxide that was present in the bed is discharged, pressurizing the column and adsorbent bed with carbon dioxide, rinsing the column and the adsorbent bed by feeding carbon dioxide, until at least 60% of the methane and optionally an amount equal to at least 50% of the carbon dioxide present at the commencement of this rinsing step is discharged, rinsing the column and adsorbent bed by feeding a mixture of hydrogen and nitrogen, pressurizing the column and adsorbent bed by feeding a mixture of hydrogen and nitrogen. With this method a feed comprising at least 50 vol % carbon monoxide can be produced. Furthermore, methane and carbon dioxide at a high pressure can be recovered from the Fischer-Tropsch gas. This can be fed to a gasifier or a reformer. In a preferred embodiment a gas comprising at least 80 vol % hydrogen is produced as well.

A system and method for improving the quality of a raw gas or raw syngas passes the raw gas or raw syngas past a catalytic element comprising catalyst with an optional sorbent. A downstream measurement of one or more parameters of the improved gas is fed back to a controller configured to regulate the regeneration of the catalyst and optional sorbent and, optionally, the flow rate of the regeneration fluid to the catalytic element. The system and method are particularly suitable for improving raw syngas generated from a carbonaceous material in a fixed bed or fluidized-bed or entrained-flow gasifier. One or more undesirable syngas constituents are subject to one or more of catalytic cracking, reforming, partial oxidation and/or decomposition to promote their conversion into desirable syngas constituents. At least one catalytic element is regenerated in situ, either periodically, continuously, or in a combination of these two modes.

Methods and apparatuses are provided for isomerizing a hydrocarbon stream. The method includes isomerizing a hydrocarbon stream in a reactor to produce an intermediate isomerized stream. The intermediate isomerized stream is fractionated to produce an off gas stream and a heavy isomerized stream, where the off gas stream includes an off gas recycle stream. The off gas recycle stream is dried in an off gas dryer to produce a hydrogen recycle stream, where the off gas drier includes an off gas dryer membrane separating the off gas recycle stream from an off gas purge stream. The off dryer membrane includes a perfluorosulfonated ionomer. The hydrogen recycle stream is then fed into the reactor.