DD202131A5 - METHOD FOR REMOVING INCORRECTLY CARBONIZED CARBON - Google Patents

Abstract

In order to determine the organically bound carbon (TOC) in water, in order to avoid erroneous measurements, the inorganically bound carbon must be quantitatively removed before a TOC determination. For this purpose, the water is acidified with a mineral acid and expelled the formed CO deep 2 with gas. The CO 2 deep loaded gas is then passed over a CO 2 deep filter and completely fed back to the acidified water. In this case, the gas cycle CO deep 2-free gas may neither be fed nor removed.

Description

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Process for removing inorganic carbon from water,

Field of application of the invention

The invention relates to a method for expelling inorganically bound carbon from water by acidification of the water with a mineral acid and expelling the COo formed with gas, wherein the gas loaded with GO _{2 is passed} over a COg-Pilter and partially fed back to the acidified water.

Characteristic of the known technical solutions

In the determination of the organic carbon (TOC) in water, inorganically bound carbon, as present in all natural waters in the form of CO ₂ , HCO ₃ "and CO ₂ , is generally detected. It must either be removed beforehand or determined separately and deducted from the measurement result.

According to G. Ax, House of Technology - Lecture Publications, Issue 231 (1970) pages 21 to 28, a method for removing inorganic carbon from water of the type mentioned is known · The disadvantage of this method is that the acidification only in the relatively small Wastewater flow can be done, which is also fed to the incinerator of the downstream TOC analyzer. If only a partial flow of the acidified sample is used for the TOC measurement, volatile hydrocarbons are also lost and the measurement is falsified.

Object of the invention

The aim of the invention is the elimination of these disadvantages.

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Explanation of the essence of the invention;

The invention solves the problem in that the gas cycle COp-free gas is neither supplied nor removed.

To discharge GOp from the acidified sample, a closed gas loop completely separate from the TOC analysis is used. In this way, a relatively large sample stream of inorganic carbon

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Free components and measure a partial flow without losses of volatile hydrocarbons.

The inventive method will be explained in more detail below with reference to FIG.

For the measurement of certain water, which is supplied via line 2 acid is passed continuously or discontinuously via line 1 in vessel 3, in which a certain level of liquid is maintained by means of overflow 5. Gas, for example air, bubbled through the water in the vessel 3, thereby carrying off CO ₂ and optionally volatile organic hydrocarbon compounds. In a CO ^ filter 8, the air is purified by CO- and fed via line 7 by means of pump 9, for example a membrane pump, the water in vessel 3 again. After a short period of operation, no volatile organic carbon compounds are discharged because a saturation equilibrium between air and water has been established. The water required for the analysis is now removed via line 3. Line 4 provides for the venting of vessel 3.

Claims (1)

237013 0 -ι- 0 * ^H0E claim Method for expelling inorganically bound carbon from water by acidification of the water with a mineral acid and expulsion of the formed CO ₂ with gas, wherein the gas loaded with CO ₃ via a CO _? Filtered and partially fed back to the acidified water, characterized in that the gas cycle CO ₂ ~ free gas is neither supplied nor removed. For this 1 page drawings