A double tube sealed sampling device adapted to be incorporated into a dip tube for sampling the contents of a chemical reactor on a continuous or intermittent basis. In a preferred form, the device may be maintained in a sealed relationship to the reactor to avoid any contact with the contents of the reactor with the outside environment. In installed condition, the two tubes which are of relatively small diameter are shielded from turbulence within the reactor by the larger diameter hollow cylinder of the dip tube, thereby permitting the smaller diameter tubes to be formed from unreinforced polytetrafluorethylene (PTFE) or similar material.
Enameled tubular unit which can be inserted into and fixed at the nozzle of a vessel and which is enameled at all places exposed to the product and can be used as dip pipe. The unit is having a double wall formed by two coaxial tubes (1,2) connected at the lower end through a connecting region with each other. The outer surface of the outer tube (1), the inner surface of the inner tube (2) and the connection region are enameled. The diameter of the outer tube is selected in accordance with strength considerations in such a manner, that it permits performing an additional function of the unit. Into the inner tube (2) a sampling tube (3) is inserted, consisting of a material having a corrosion resistance corresponding to the corrosion resistance of enamel. The outer tube may be a component part of a thermometer tube or of an agitation baffle. The outer tube may also serve as a measuring probe carrier.
Methods for sampling mixtures of flowable materials such as pulp streams are disclosed including tapping a minor portion of these mixtures and circulating the tapped portion continuously through a circuit, diluting the circulating tapped mixture to dilute the tapped mixture to a predetermined concentration, and recycling a portion of the diluted stream to the original mixture of materials. Apparatus for carrying out such a method is also disclosed.
A device capable of being mounted in a small opening in a reactor vessel, after having been inserted through a manway, which permits the continuous sampling of the contents of the reactor during a reaction, and continuous monitoring of the pH factor or other characteristic of interest. Electrical probe replacement is possible without disconnecting the device from the reactor vessel, and requires only a minimum of down time.
A valve assembly for on-line removal of representative granular material such as catalyst samples from a process vessel such as a reactor including a plunger type valve having an extension tube of catalyst-compatible material attached to the sampling end of the valve through which sample can be extracted from a predetermined location in the catalyst bed via a flexible auger, or sucked by vacuum into a collection pot, under an inert atmosphere; and the sampling process using the valve assembly. The valve assembly and process allows sampling without contaminating or modifying the oxidation state of the sample or damaging the catalyst, reduces reactor downtime, and allows repeated sampling without the problem of leakage.
An improved sampling device for collecting at least part of air-borne particles in a workman's breathing zone. The device comprises a cassette provided with an inlet, an outlet and an air filter, a vacuum pump and a flexible tubing of determined length connecting the vacuum pump to the outlet of the cassette. In use, a portion of the air contained in the breathing zone of the workman is drawn through the filter and the particles collected thereon. This device is improved in that a deformable metallic tubing is positioned inside a portion of the flexible tubing or is positioned between a short length of a tubing connected to the outlet of the cassette and this flexible tubing. In addition, at least one fastener is provided for fixing the deformable metallic tubing and eventually the flexible tubing, to at least one strap intended to be tightened around a workman's head. This device is useful to position the air-intake of the cassette in the workman's breathing zone.
