Sammel- und Druckentlastungsvorrichtung in einem Gerät zur fortlaufenden Ausführung von Analysen oder zur andersartigen Behandlung von Flüssigkeiten

摘要

A device suitable for relieving pressure build-up or irregularity in flowing streams of liquid for analysis or other processing and/or removal of a part of said stream comprises a first chamber 42 having a vent 48 and an inlet 46, a second chamber 50 having an outlet 56 for excess liquid and an aspirating tube 68 terminating below said outlet. The numerals refer to the preferred embodiment shown in Fig. 2 in which a vent 58 is provided in said second chamber and the outlet 56 is provided with gas and liquid vents 60, 62. Reinforcing ribs 64 and 66 are provided. As illustrated in Figs. 1 and 3 (not shown) the device is located in a conduit fed with a segmented liquid/air stream from a proportioning pump of the type in which a roller passes over plastic tubes, said conduit also leading back to said pump and containing a mixing coil and either a heating coil or a heating coil and the dialysate sides of two dialysers in series, the latter devices resulting in high resistance or flow surges which are relieved by the device of the invention. The use of two such devices between elements creating excessive pressure with return of a part of flow to the pump before feeding to the second device is also disclosed. This apparatus may be applied to the colorimetric determination of (a) sugars present in condensed water obtained in sugar manufacture which is subsequently employed in steam boilers, the sugar being first hydrolysed with sulphuric acid in the heating coil, potassium ferricyanide and potassium cyanide in sodium hydroxide solution subsequently being added separately to the resultant stream of reducing sugars, and the mixture being passed to a colorimeter; (b) antibiotic substances such as tetracycline and chlorotetracycline in broths, the broth being hydrolysed with p sulphuric acid (unless chlorotetracycline is not present), having hydrochloric acid added thereto and being then passed to a colorimeter; (c) sugar in waste and sewer water in refineries, wherein a hydrolysed product stream obtained as in (a) is dialysed, the ferricyanide reagent is passed through the dialysate side of the membrane and the potassium cyanide is then added before passing to the colorimeter. All the above processes as described involve flowing streams of liquid segmented with air or inert gas. Specifications 774,711, 783,649, 827,924, 834,635 and 863,910 are referred to.