Abstract:
Some embodiments of the disclosure pertain to a plant and a process for producing a urea-containing product. The plant comprises a medium pressure dissociation unit and a high pressure CO2 stripper each receiving a part of the urea synthesis solution. Stripped urea solution is further treated in a medium pressure treatment unit.
Abstract:
The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is neutralized at least partly with a base and at least one stream of the neutralization is determined continuously, and also to an apparatus for carrying out the process.
Abstract:
The present invention relates to multicolor colloidal particles coated with a metal nanoparticle mixture having colors in the visible region and a method for preparing the same. In particular, relates to a metal nanoparticle mixture in which two or more nanoparticles selected from the group consisting of metal nanoparticles exhibiting red color; metal nanoparticles exhibiting yellow color; and metal nanoparticles exhibiting blue color, are mixed in various compositional ratio, multicolor colloidal particles in which polymer or mineral colloidal particles are coated with the metal nanoparticle mixture, and a method for preparing the same. According to the present invention, all colors that are in the visible region can be developed by suitably mixing metal nanoparticles exhibiting three colors, and multicolor colloidal particles can be prepared by coating polymer or mineral colloidal particles with a metal nanoparticle mixture exhibiting various colors.
Abstract:
A vacuum actuated and sustained ammonia feed system for the pH adjustment of power plant condensate and boiler feed water is described. This system can provide a safe means of providing anhydrous ammonia for pH adjustment to the condensate/feed water system of a power plant.
Abstract:
The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is neutralized at least partly with a base and at least one stream of the neutralization is determined continuously, and also to an apparatus for carrying out the process.
Abstract:
Provided are methods and systems for generating nanoparticles from an inorganic precursor compound using a hydrothermal process within at least one CSTR or PFR maintained at an elevated temperature and an elevated pressure and a treatment vessel in which this reaction solution can be applied to one or more catalyst substrates. In operation, the reaction solution may be maintained within the CSTR at a substantially constant concentration and within a reaction temperature range for a reaction period sufficient to obtain nanoparticles having a desired average particle size of, for example, less than 10 nm formation and/or deposition. Variations of the basic method and system can provide, for example, the generation of complex particle size distribution profiles, the selective deposition of a multi-modal particle size distribution on a single substrate.
Abstract:
A device is provided for increasing the pH of an acidic aqueous stream, which may result from commercial activity in petroleum, mining, metal finishing and food processing sectors, among others. A container defines an upright reactor portion with a cross-section that increases upwardly, along with inlet and outlet conduits connected to an inlet and an outlet between which the reactor portion is located. The conical portion contains a bed of substantially water-insoluble alkaline salt particulate, such as MgO, the bed being such that, when the pH of the inflowing aqueous stream is below 7, contact between the particulate and the aqueous stream will raise the pH of the outflowing stream to a level above that of the inflowing stream.
Abstract:
Method and apparatus for electrolytically controlling the formation of scale and biofilm in water purification and other systems. An anode is deposited on or disposed on or adjacent to a surface, such as that of a quartz UV tube, providing a low pH environment which inhibits the formation of carbonate scale and biofilm.
Abstract:
The invention relates to a method for adjusting the dosage of reaction components in a continuous azoic coupling reaction characterized in that the redox potential of the reaction mixture is measured online in the main flow after it exits from a continually operated reactor in a flow measurement cell with the aid of a rotating redox electrode which is arranged crosswise in relation to the direction of flow of the reaction mixture. The invention also relates to a flow measurement cell for carrying out said method, characterized by the following: a rotating redox electrode (1) which is arranged approximately in the middle of the flow pipe (2) of the flow measurement cell in a crosswise position with relation to the direction of flow of the reaction mixture and rotatably mounted in a sliding contact (3) for picking up a signal; a rod-shaped body (4) which enters into contact with the rotating redox electrode and which has a cleaning effect; a reference electrode (5) and a pH electrode (6).
Abstract:
A method of preparing a water-soluble or water-dispersible pesticidal composition is described. The pesticidal composition is prepared in a continuous process by intimately mixing a Bronsted acid precursor of the pesticidally active compound with a Bronsted base under reaction conditions in an extruder. The reaction is performed with minimal solvent and under conditions where the water of reaction volatilizes during the course of the reaction.