Methods and systems for producing aromatics and light olefins from a mixed plastics stream are described. The method may include feeding a plastic feedstock to a dechlorination operation to melt the plastic feedstock to release HCl and generate a liquid plastic stream; feeding the liquid plastic stream to a pyrolysis reactor, the pyrolysis reactor to generate hydrocarbon vapors; feeding the hydrocarbon vapors to an acid gas removal reactor with a solid inorganic alkali salt disposed within the reaction vessel to remove residual HCl and sulfur-containing compounds from the hydrocarbon vapors to generate a plastic derived oil; and feeding the plastic derived oil to a steam enhanced catalytic cracking reactor to generate a product stream comprising light olefins having a carbon number of C.sub.2-C.sub.4 and aromatics. The associated system for processing mixed plastics into aromatics and light olefins is also described.

A process for treating effluent streams in a naphtha complex is described. One or more of the sour water stripping unit for the NHT sour water from the NHT, the amine treatment unit and the caustic treatment unit for the NHT stripper off-gas, the caustic scrubber unit or other chloride treatment unit for the off-gas from the C.sub.5-C.sub.6 isomerization zone and the C.sub.4 isomerization zone, and the caustic scrubber unit or other chloride treatment unit for the regenerator off-gas are replaced with a thermal oxidation system.

A process for treating effluent streams in a renewable transportation fuel production process is described. One or more of the sour water stream and an acid gas stream are treated directly in thermal oxidation section. The process allows the elimination or size reduction of a sour water stripper unit, waste water treatment plant, and sulfur recovery unit.

The use of a composition including at least one acido-basic neutralising agent for decontaminating an atmosphere contaminated by a corrosive gas, the acido-basic neutralising agent having at least 2 pKa's and being characterised by: pKa 1≤pKa 2, pKa 1>2, pKa 2<12, 4<½ (pKa 1+pKa 2)<10 pKa 1, representing the smallest of the basic pKa's and pKa 2 representing the largest of the acidic pKa's. Also, a method for decontaminating an atmosphere contaminated by a corrosive gas comprising the spraying of the neutralising agent, and to a decontamination device.

A duct can be configured to receive a denuding gas flow. A solid denuding surface that is connected to a drive system can be configured to move the solid denuding surface within the duct while the solid denuding surface is continuously concentrating one or more gas-phase species from the denuding gas flow on the denuding surface. Also, a denuding gas flow can be passed along a denuding surface to concentrate one or more gas phase species from the denuding gas flow onto the denuding surface with a diffusion denuding action. The denuding surface can be moved while continuing to concentrate the one or more gas phase species from the denuding gas flow onto the denuding surface.

A desulfurization wastewater zero discharge treatment method and system suitable for multiple working conditions. A tail flue of a boiler and a bottom outlet of a wastewater drying tower are both communicated with an inlet of a dust collector; an outlet of the dust collector is communicated with flue gas inlets of a wastewater concentration tower and a desulfurization absorption tower; the wastewater concentration tower is communicated with the desulfurization absorption tower; the desulfurization absorption tower is communicated with a chimney; the desulfurization absorption tower is communicated with a gypsum cyclone; the gypsum cyclone is communicated with a filtrate water tank; the gypsum cyclone is communicated with a gypsum dewatering machine; the gypsum dewatering machine is communicated with a gas liquid separating tank; and a flue gas port of the tail flue of the boiler is communicated with the flue gas inlet of the wastewater drying tower.

A method for producing a high-purity hydrogen chloride gas comprises performing a purification process that includes the steps 1) to 3) below on a byproduct hydrogen chloride gas: 1) a crude hydrochloric acid generation step of allowing water to absorb the byproduct hydrogen chloride gas; 2) a volatile organic impurity-removed hydrochloric acid generation step of bringing the crude hydrochloric acid obtained in the step 1) into contact with an inert gas at a liquid temperature of 20 to 45° C. to dissipate volatile organic impurities; and 3) a high-purity hydrogen chloride gas generation step of supplying the volatile organic impurity-removed hydrochloric acid obtained in the step 2) to a distillation column and performing distillation under conditions of a column bottom temperature of higher than 60° C. and 108° C. or lower and a column top temperature of 60° C. or lower to distill out a high-purity hydrogen chloride gas.

A gas separation apparatus includes a separation membrane module including at least one gas separation membrane element in a housing, a casing for blocking external air, and a heat source unit for adjusting a temperature of a heat medium with which the casing is filled. The casing holds greater than or equal to two separation membrane modules.

A heated inlet tube for use in a wet scrubber is disclosed. In one embodiment, the heated inlet tube comprises a heated tube concentric to the inlet tube to which a heated gas is applied thereby maintaining temperature of a waste gas stream as it flows through the inlet tube. In a further embodiment, an insulating tube concentrically surrounds the heated tube to further maintain the temperature of the waste gas stream.

Lime-based sorbent suitable for use in a flue gas treatment process comprising at least 70 wt. % of Ca(OH).sub.2 and at least 0.2 wt. % to at most 10 wt. % of a first additive selected among the group of hydrogels of natural or synthetic origin, in particular superabsorbent polymers (SAPs) or in the group of cellulose ethers or a combination thereof, premix for use in a manufacturing process of said sorbent, process for manufacturing the sorbent and use of said sorbent in a flue gas treatment process