Abstract: An insulated chamber (1) for preservation and transportation comprises a container (2) of carbon dioxide snow provided with a lateral opening (5) permitting the injection, within the container, of liquid CO.sub.2 under pressure by a distribution device (10) connected to a source of liquid CO.sub.2 (6). The distribution device is provided with an electrovalve (18) controlled by a control block (19) comprising a timer permitting selecting the duration of injection of liquid CO.sub.2 into the container (2) to form there a controlled volume of carbon dioxide snow. The installation is useful for the preservation and transportation of fresh food products as well as frozen food products.

Abstract: An insulated chamber (1) for preservation and transportation comprises a container (2) of carbon dioxide snow provided with a lateral opening (5) permitting the injection, within the container, of liquid CO.sub.2 under pressure by a distribution device (10) connected to a source of liquid CO.sub.2 (6). The distribution device is provided with an electrovalve (18) controlled by a control block (19) comprising a timer permitting selecting the duration of injection of liquid CO.sub.2 into the container (2) to form there a controlled volume of carbon dioxide snow. The installation is useful for the preservation and transportation of fresh food products as well as frozen food products.

Abstract: The present invention relates to an isothermal container with isothermal walls comprising a thermally conducting reservoir (10) for refrigerant product disposed in the upper part of the container; a baffle (3) of thermally insulating material, of a size slightly less than the internal section of the container and having about its periphery an annular space (8) suitable for the free passage of the gas is disposed horizontally below the reservoir (10), at a distance sufficient to delimit in the upper part of the container a region (6) suitable for natural convective heat exchange; the reservoir (10) and the baffle (3) comprising securement and support means (4, 12, 13, 14) in the container (1), characterized in that it computes at least one food compartment (c) disposed in the container, below the plate forming a baffle, of a size substantially less than the internal volume of the container, a space remaining free about the compartment (c) in the container.

Abstract: A cylinder (11) provided with a plunger tube (28) contains a mass of supercritical CO.sub.2 containing 2 to 6% of dissolved helium, surmounted by a gaseous sky constituted by helium at a pressure higher than about 135 bars. Supercritical CO.sub.2 can be in this way obtained which contains a few % of helium dissolved by a simple opening of the valve (27) of the cylinder. Application in the cosmetic industry.

Abstract: Particles of shot and particles of carbon dioxide ice are simultaneously blasted onto the work piece (6) to be treated. Application in the treatment of the surface of work pieces composed of plastics material or coated with a plastics material.

Abstract: A carbon dioxide snow nozzle for in particular rendering a molten metal inert. The nozzle comprises a supply pipe supplying liquid carbon dioxide under pressure for connection to a source of liquid carbon dioxide under pressure, a T-shaped element having one end connected to the pipe and the other two ends connected to liquid carbon dioxide conveying line which each have and to a controlled valve the outlets of the valves being interconnected by a V-shaped connecting element which opens onto a pipe for discharging the snow.

Abstract: A treatment chamber for a charge comprises at least oen door, internal walls delimiting a treatment space, passages for the recirculation of gas, and apparatus for circulating gases in the treatment space and the passages. The circulating apparatus extracts the gases from the treatment space (4) and sends them through the passages (9, 9'). The chamber is provided with injectors (12) for cryogenic fluid and an outlet (16) for evacuation of gas. The injectors are at least one nozzle (12) to spray liquid nitrogen or carbon dioxide and are disposed adjacent the circulating apparatus, which is in the form of a fan (8), the injectors (12) being directed toward the inlet of this fan. In the corresponding treatment process, a cryogenic gas is circulated through the charge, a cryogenic fluid e.g. liquid carbon dioxide or liquid nitrogen is injected into the gas flow leaving the charge, and the cooled gas is recirculated so as to cause it to pass again through the charge in the same direction.

Abstract: Liquid carbon dioxide is injected through one end into the upper compartment (14) of the tunnel. The gaseous CO.sub.2 is circulated in the lower compartment (13) partly in a countercurrent manner and partly in a cocurrent manner relative to the objects (22) to be cooled, by a central fan (9). Application in the temporary hardening of products of rubber and plastics material and in the precise cooling of food products.

Abstract: A process and apparatus for bringing CO.sub.2 from a storage tank wherein it is stored at a medium pressure and below 0.degree. C. (e.g. -20.degree. C. and 20 bars pressure) to a high pressure such as 80-130 bars, without utilizing any pump operating below 0.degree. C. The build-up of ice on such a pump is thus avoided. To do this, liquid from the tank is caused to completely fill by gravity an intermediate vessel. Then the vessel is heated to about ambient temperature; and while maintaining such temperature (e.g. by means of resistor 16), the liquid in the vessel is subcooled by compression in FIG. 1 or by cooling water in FIG. 2, and conveyed to the inlet of the high pressure pump.

Abstract: The installation comprises three units separated from one another: a grinding mill (1) fed with pieces of dry ice, a metering device (3) having an extracting spring-screw (13), and a propelling device (5) mounted in a vehicle gas conduit (4). The assembly is maintained under an atmosphere of CO.sub.2 by a cover (6). Application in the cleaning of surfaces in the nuclear industry.

Abstract: The apparatus comprises a plurality of modular containers (2) each receiving a charge of products. Liquid CO.sub.2 is injected into each container under the control of a thermostat (28). The excess gases are collected in a single manifold (5), heated in a vessel (3) and then discharged through calibrated discharging means (7). The invention is particularly suitable for the cooling of food products.

Abstract: The gaseous CO.sub.2 is supplied at a pressure of 10 bars and at a constant rate of flow to the primary inlet (3) of an aspiration device (1). Gaseous SO.sub.2 coming from a cylinder (24) which is heated and contains liquid SO.sub.2 is conducted through a heated line (4) provided with an adjustable flow meter (27) to the secondary inlet (5) of the aspiration device. The mixture issuing from the latter is injected into a buffer tank (6) whose pressure is regulated at a value higher than the pressure of utilization and is drawn from this buffer tank when utilized. Applications in the supplying of mixtures for hardening sand moulds or cores to foundries of medium size.

Abstract: A treatment chamber for a charge comprises at least oen door, internal walls delimiting a treatment space, passages for the recirculation of gas, and apparatus for circulating gases in the treatment space and the passages. The circulating apparatus extracts the gases from the treatment space (4) and sends them through the passages (9,9'). The chamber is provided with injectors (12) for cryogenic fluid and an outlet (16) for evacuation of gas. The injectors are at least one nozzle (12) to spray liquid nitrogen or carbon dioxide and are disposed adjacent the circulating apparatus, which is in the form of a fan (8), the injectors (12) being directed toward the inlet of this fan. In the corresponding treatment process, a cryogenic gas is circulated through the charge, a cryogenic fluid e.g. liquid carbon dioxide or liquid nitrogen is injected into the gas flow leaving the charge, and the cooled gas is recirculated so as to cause it to pass again through the charge in the same direction.