Methods of sequestering carbon dioxide (CO.sub.2) are provided. Aspects of the methods include contacting an aqueous capture ammonia with a gaseous source of CO.sub.2 under conditions sufficient to produce an aqueous ammonium carbonate. The aqueous ammonium carbonate is then combined with a cation source under conditions sufficient to produce a solid CO.sub.2 sequestering carbonate and an aqueous ammonium salt. The aqueous capture ammonia is then regenerated from the from the aqueous ammonium salt. Also provided are systems configured for carrying out the methods.

A multi-stage process for the production of a Product Heavy Marine Fuel Oil compliant with ISO 8217: 2017 as a Table 2 residual marine fuel from a high sulfur Feedstock Heavy Marine Fuel Oil compliant with ISO 8217: 2017 as a Table 2 residual marine fuel except for the sulfur level, involving hydrotreating under reactive distillation conditions in a Reaction System composed of one or more reaction vessels. The reactive distillation conditions allow more than 75% by mass of the Process Mixture to exit the bottom of the reaction vessel as Product Heavy Marine Fuel Oil. The Product Heavy Marine Fuel Oil has a maximum sulfur content (ISO 14596 or ISO 8754) less than 0.5 mass %. A process plant for conducting the process for conducting the process is disclosed.

This disclosure concerns a system for purifying contaminated water and a method for using the system. More specifically, the invention concerns removing contaminants, such as those introduced by fracking, from a contaminated water.

The application provides in an aspect a process for producing urea in a urea plant comprising a high pressure synthesis section comprising a reactor, wherein the process comprises reacting NH.sub.3 feed and CO.sub.2 feed under urea formation conditions in said reactor to form a urea synthesis solution comprising urea, water, carbamate and ammonia, wherein the process further comprises contacting a carbamate-containing liquid stream with an equipment part of said high pressure synthesis section that is made of a ferritic steel alloy.

A desolidification process enables the isolation and extraction of solid additives from an unreacted petroleum residue stream. In a hydrocracking process that mixes a solid additive with a petroleum residue feedstock to convert the petroleum residue to higher-value distillates, the desolidification process enables the recovery of the unreacted petroleum residue for conversion to a saleable product. The desolidification process involves the mixture of one or more solvents with a slurry in which solids are integrated in the petroleum residue to generate a mixture having a decreased density and viscosity as compared to the slurry, which facilitates removal of the solids.

The present invention refers to a process for purifying leucoindigo salt solutions, for removal of aromatic amines, particularly aniline and N-methylaniline, comprising: adding to a purification vessel a leucoindigo salt solution containing aromatic amines, said solution in the form of a stationary mass; bubbling with a controlled flow rate an inert gas in the purification vessel, by means of a device submerged at the surface of the stationary mass; injecting with a controlled flow rate a gas purification current into the vessel, by means of a device submerged at the stationary mass; and recovering the purified solution from the vessel. It also refers to the use of inert gas in a process for purifying leucoindigo salt solutions, acting as a gas anti-foaming agent, to reduce foam and chances of product stripping during processing.

The present invention is in the field of a method for obtaining high purity hydrogen peroxide, as well as a production unit for obtaining high purity hydrogen peroxide. It concerns a method for obtaining high purity hydrogen peroxide comprising the steps of providing an open container with an aqueous fluid comprising hydrogen peroxide, putting the open container with the aqueous fluid in a closed space, at ambient conditions providing an inert gas flow over and in contact with the aqueous fluid, removing water from the aqueous fluid at said ambient conditions by said gas flow, and thereby concentrating the hydrogen peroxide. The invention also concern a production unit for use in said method.

A system for stabilizing a hydrocarbon feedstock includes a High Pressure Separation (HPS) unit in fluid communication with a feedstock inlet. The HPS unit includes an oil outlet. The system includes a heated Low Pressure (LP) separator unit downstream from and in fluid communication with the oil outlet of the HPS unit. The heated LP separator unit includes an oil outlet. The system includes a heat exchanger positioned between the HPS unit and the heated LP separator unit.

The invention relates to a process for the continuous production of acrylic acid, in the absence of organic solvent and in the absence of chemical treatment of the aldehydes, and without employing a dividing-wall column, from a gaseous reaction mixture comprising acrylic acid obtained by gas-phase oxidation of a precursor of acrylic acid.

The invention relates to a process for the continuous production of acrylic acid, in the absence of organic solvent and in the absence of chemical treatment of the aldehydes, and without employing a dividing-wall column, from a gaseous reaction mixture comprising acrylic acid obtained by gas-phase oxidation of a precursor of acrylic acid.