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The acquisition method of organic compound theoretical cod, the detection method of sewage cod and the detection device of sewage cod

A technology of organic compounds and detection methods, applied in the field of theoretical chemistry, can solve complex problems that cannot directly calculate metal-containing elements

Active Publication Date: 2019-03-12
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for obtaining the theoretical COD of organic compounds, a detection method for sewage COD and a detection device for sewage COD, so as to solve the problem that existing computational theoretical chemistry methods are complicated and cannot directly calculate metal-containing elements. Problems in Theoretical Chemistry of Organic Compounds

Method used

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  • The acquisition method of organic compound theoretical cod, the detection method of sewage cod and the detection device of sewage cod
  • The acquisition method of organic compound theoretical cod, the detection method of sewage cod and the detection device of sewage cod
  • The acquisition method of organic compound theoretical cod, the detection method of sewage cod and the detection device of sewage cod

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Embodiment 1

[0041] Potassium hydrogen phthalate is composed of 8 C, 5 H, 4 O, and 1 K. The oxidation value of each element is set to 0, and the corresponding oxidation products CO2, H2O, and K+ are corresponding The oxidation value is +4(C), +1(H), -2(O), +1(K), according to the formula Ne=∑A i f i , get 4×8+5×1-4×2+1×1=30, similarly the corresponding theoretical chemical oxygen demand can be calculated.

[0042] Calcium oxalate has 2 C, 4 O, and 1 Ca, and the corresponding product oxidation values ​​are +4, -2, +2 respectively, according to the formula Ne=∑A i f i , get 4×2-4×2+2×1=2, the corresponding theoretical chemical oxygen demand can also be calculated.

[0043] In the same way, the theoretical COD values ​​of hydrocarbons, alcohols, aldehydes, ketones, acids, organometallics, various organic compounds containing heteroelements such as N and halogen, and functional groups can be calculated. The results are shown in Table 1.

Embodiment 2

[0045] Utilize detection device provided by the invention to measure the theoretical chemical oxygen demand of acetaldehyde

[0046] To contain acetaldehyde CH 3 The sewage of CHO is taken as an example. The type of functional groups in the sewage is obtained through the detection device, and the functional groups contained in the sewage are identified through the data identification module as methyl and aldehyde groups, and the molar number is 1. The CH is obtained through the data acquisition module. 3 and the molar COD'(η) of CHO are 23.9991001mg·mol respectively -1 and 55.9979039 mg·mol -1 , the total COD (η) of acetaldehyde calculated by the first calculation module is 79.9969820mg·mol -1 . In the same way, the theoretical COD values ​​of various organic compounds containing hydrocarbons, alcohols, aldehydes, ketones, acids, metal organics, heteroelements such as N and halogen can be calculated, and the results are shown in Table 1.

[0047] The total COD and total TO...

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Abstract

The invention provides a method for acquiring theoretical COD of an organic compound, a detection method for COD of sewage and a detection apparatus for COD of sewage. The method for acquiring the theoretical COD of the organic compound comprises the following steps: recording the valence of each element in the end product of each element in the organic compound as the final-state valence of each element, wherein the end product is a complete combustion product of the organic compound or a product obtained by adding ammonium ferrous sulfate for an oxidation reduction reaction after an oxidation reaction of the organic compound with excess potassium dichromate; recording the initial valence of f each element in the organic compound as 0 and calculating the sum of transferred electrons in the organic compound according to the equation that Ne=Sigma(Ai.fi), wherein Ai represents the atomic mole number of an element i in the organic compound and fi is a change value of the valence of the element i; and acquiring the theoretical COD of the organic compound according to the sum Ne of the transferred electrons. The method does not need chemical balancing, simplified the calculation process of the theoretical COD and is applicable to compounds containing metallic elements.

Description

technical field [0001] The invention relates to the field of theoretical chemistry, in particular to a method for obtaining theoretical COD of organic compounds, a method for detecting COD of sewage, and a detection device for COD of sewage. Background technique [0002] Theoretical chemical oxygen demand (COD), also known as theoretical chemical oxygen demand, refers to the oxidation of 1mol or 1g (or other mass and concentration units) of organic compounds to form stable inorganic compounds, and the oxidant consumed is equivalent to the amount of oxygen required. Generally, this value is obtained according to the chemical reaction equation. [0003] In existing studies, when calculating the theoretical chemical oxygen demand of organic matter, researchers have established mathematical models through chemical reaction equations and complex balancing processes. In the above research process, the judgment of the reaction products of nitrogen-containing (N) and halogen-contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/18
Inventor 石占崇李永存王飞刘春艳候立波赵胤
Owner PETROCHINA CO LTD