A Method for Quickly Detecting the Content of Acidic Substances in Natural Gas
A technology for acidic substances and natural gas, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve the problems of acidic substance monitoring methods not mentioned, and achieve simple sampling, The effect of low detection limit and reduction of economic loss
Active Publication Date: 2016-03-02
SUZHOU JINHONG GAS CO LTD
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Problems solved by technology
However, in the existing domestic natural gas standards, there is no mention of monitoring methods for acidic substances. The majority of technical personnel have been working hard to find a method for quickly detecting the content of acidic substances in natural gas. For this reason, Suzhou Jinhong Gas Co., Ltd. The testing center carried out research and successfully developed a method for rapid detection of acidic substances in natural gas
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] 1. Instruments and equipment
[0038] (1) Laboratory grade water or higher pure water;
[0039] (2) Several stainless steel pipelines: Ф1 / 4 stainless steel pipelines, the specifications are imperial;
[0040] (3) Gas flow meter: can be accurate to 1mL per minute;
[0041] (4) Phenolphthalein indicator (10g / L): Weigh 1 gram of phenolphthalein and dissolve it in ethanol (95%), dilute to 100mL with ethanol;
[0042] (5) Sodium hydroxide standard solution (0.1mol / L): Purchase from the standard reagent or standard solution manufacturer, at least 1L for each purchase, must be stored in a polytetrafluoroethylene bottle, and the validity period is three months;
[0043] (6) Iodine bottle: 250mL iodine bottle with stopper;
[0044] (7) Stopwatch: accurate to 1 second;
[0045] 2. Preparation:
[0046]Sample preparation: Take a clean 250mL stoppered iodine measuring bottle, add 200mL water and cover the lid; then take a section of PTFE hose with a diameter of 0.125cm, and co...
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The invention discloses a method for fast detecting acidic substance content of natural gas. The method comprises the following steps that acidic substances in natural gas go through distilled water and are fast dissolved in the distilled water so that an acidic solution is obtained, 100mL of each one of sample solutions is accurately weighed, the weighed sample solutions are respectively put into two iodine flasks, and 0.5mL of a phenolphthalein indicator is added in each one of the iodine flasks; 100mL of distilled water is added into an iodine flask without the samples and 0.5mL of the phenolphthalein indicator is added into the iodine flask without the samples; a standard sodium hydroxide solution having the content of 0.1mol / L is dropwisely added into the blank control without the samples for titration until a titration end-point at which the solution has a light red color kept for 15s, and the used standard sodium hydroxide solution has the volume (B); and then the standard sodium hydroxide solution having the content of 0.1mol / L is dropwisely added into the sample solutions until the titration end-point at which the sample solution has a light red color kept for 15s, the used standard sodium hydroxide solution has the volume (A), and the acidic substance content of the natural gas is calculated according to a formula of 0.4*(A-B). The method has the advantages of sampling simpleness, operation simpleness, low cost, fast analysis speed, high detection precision, low detection limit, internal control on natural gas quality, management and control on natural gas production and transport, and economic loss reduction.
Description
technical field [0001] The invention relates to a method for detecting impurities in gas, in particular to a method for rapidly detecting the content of acidic substances in natural gas. Background technique [0002] Natural gas is a high-quality energy source with large reserves, convenient transportation, low cost, clean and ash-free, high calorific value and low environmental pollution from combustion products. Therefore, it is an ideal source of urban gas. Judging from the trend of energy utilization in the world, the use of natural gas as the main source of town gas has become the current development direction. In my country, for more than a decade, all cities with good conditions, such as Tianjin, Chengdu, Beijing, etc., have successively sent natural gas from adjacent oil and gas fields to urban areas through pipelines as a source of gas for towns. [0003] The main component of natural gas is methane (CH 4 ), among various hydrocarbon molecules, its ratio of carbon...
Claims
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IPC IPC(8): G01N21/78
Inventor 金向华王海黄军聘朱威莉
Owner SUZHOU JINHONG GAS CO LTD