Abstract:
A method for preparing sterilized fine particles is provided to sterilize all of microorganisms and spores contained in the fine particles effectively, and to retain original shape and properties of the fine particles. A method for preparing sterilized fine particles using supercritical fluid includes the steps of: (i) adding supercritical carbon dioxide fluid to fine particles to sterilize microorganisms present on the fine particles, wherein the supercritical carbon dioxide fluid is supplied in a condition having a temperature of 35-120 °C and a pressure of 100-700 bar; and (ii) removing the electrically supercritical carbon dioxide from the fine particles. The fine particles have a particle size ranging from 30 nm to 2 mm. Further, the carbon dioxide fluid comprises an aid solvent and an aid agent.
Abstract:
A decomposition reaction apparatus for the decomposition treatment of a thermoplastic resin, which comprises a reaction apparatus comprising an introduction section for introducing a resin composition containing the thermoplastic resin and a solvent containing a monomer component of the thermoplastic resin or a component similar to the monomer component, a decomposition reaction section for heating and pressuring the resin composition and the above solvent so as for the solvent to have a supercritical state or a subcritical state, to thereby prepare a treated and recovered product containing a recycled resin formed by the reduction of the molecular weight of the above thermoplastic resin, and a discharge section for discharging the treated and recovered product. In the above reaction apparatus, the introduction of the resin composition and the solvent, the decomposition treatment of the thermoplastic resin in the decomposition reaction section and the discharge of the treated and recovered product from the discharge section are all carried out continuously, and therefore, a raw material for a recycled resin composition using an industrial or general waste containing a thermoplastic resin as the above resin composition can be produced continuously.
Abstract:
Methods for freeze drying porous materials are provided. The methods include transferring a porous structure comprising a plurality of pores and a solvent disposed in and about the plurality of pores to a pressure chamber, exchanging the solvent with CO 2 , rapidly freezing the CO 2 , such that the formation of gas bubbles and exposure of the porous structure to a gas-liquid interface are minimized or avoided, and removing the CO 2 by subliming to yield a dried porous structure. Devices used to perform the method and compositions made according to the method are also provided.
Abstract:
A process to form an ethylene-based polymer comprising, in polymerized form, ethylene and at least one acid comonomer, said process comprising polymerizing a reaction mixture comprising the ethylene and the acid comonomer, in a reactor configuration comprising at least one Secondary compressor, at least one pressurization device, and at least one reactor selected from the following: at least one autoclave reactor, at least one tubular reactor, or a combination thereof; and wherein the reaction mixture is polymerized in the presence of at least one free-radical initiator, and at a pressure of at least 1000 Bar; and wherein at least a portion of a comonomer composition comprising at least a portion of the acid comonomer used in the polymerization, is compressed, to form a compressed comonomer composition, in the pressurization device, up to a discharge pressure ranging from 1000 Bar to 4000 Bar, and at a discharge temperature (DT) from 10C to 100C; and wherein the compressed comonomer composition bypasses the Secondary compressor, and is fed, downstream from the Secondary compressor, into the reactor, and/or into one or more feed streams to the reactor.
Abstract:
The present invention relates to a process and reactor for carrying out a liquid compression chemical reaction comprising the steps of: (i) providing a reaction medium comprising at least one liquid phase which is in contact with at least one gas phase and/or at least one 10 solid phase; and (ii) repeatedly performing a compression and expansion cycle on the reaction medium by applying force on the liquid phase which transfers the pressure on the gas phase, such that the chemical reaction takes place.