Method of predicting content of hydrogen sulfide in desulfuration amine liquid through mid-infrared spectroscopy

A technology of infrared spectroscopy and desulfurization amine solution, which is applied in the field of rapid prediction of hydrogen sulfide content in desulfurization amine solution, can solve the problems of large body toxicity, cumbersome steps, human error, etc., and achieves the effects of less human pollution, rapid prediction and easy operation.

Active Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method has cumbersome steps, many interfering factors, and two titrations are required, which can easily cause human error and reduce the repeatability and accur

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  • Method of predicting content of hydrogen sulfide in desulfuration amine liquid through mid-infrared spectroscopy
  • Method of predicting content of hydrogen sulfide in desulfuration amine liquid through mid-infrared spectroscopy
  • Method of predicting content of hydrogen sulfide in desulfuration amine liquid through mid-infrared spectroscopy

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example 1

[0073] The method of the invention is used to establish and verify the infrared spectrum correction model of the hydrogen sulfide content of the desulfurization amine liquid.

[0074] (1) Determination of hydrogen sulfide content in desulfurization amine liquid by standard method

[0075] 300 samples of desulfurized amine solution were collected, the hydrogen sulfide content was determined by iodometric method, and 260 representative samples were used to form a calibration set.

[0076] (2) Establish a calibration model with the calibration set samples

[0077] The infrared spectra of the samples in the calibration set were measured with a ThermoNicolet-6700 Fourier transform infrared spectrometer. The measurement accessory is a 45°ZnSeATR variable temperature crystal cell from Thermo Company.

[0078] The measurement method is as follows: pour the test sample into the ZnSeATR sample absorption cell, keep the temperature at 25°C, perform spectral scanning with air as a refer...

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Abstract

A method of predicting content of hydrogen sulfide in desulfuration amine liquid through mid-infrared spectroscopy includes the following steps: 1) collecting a series of desulfuration amine liquid samples in different concentrations, and detecting the content of hydrogen sulfide of the samples through a standard method; 2) measuring the mid-infrared spectroscopy of the desulfuration amine liquid samples collected in the step 1), setting the spectroscopy within the range of 950-1250/cm as a characteristic spectrum zone, correlating the absorbance of the characteristic spectrum zone to the content, which is detected through the standard method, of hydrogen sulfide of the samples, and establishing a calibration model through multivariate regression analysis; and 3) measuring the mid-infrared spectroscopy of the samples, and substituting the absorbance within the range of 950-1250/cm into the calibration model to obtain the content of hydrogen sulfide in the samples. The method is high in analytic speed, is accurate in measurement and is good in repeatability.

Description

technical field [0001] The invention relates to a method for measuring the content of hydrogen sulfide in desulfurized amine liquid by using spectrum, specifically, a method for rapidly predicting the content of hydrogen sulfide in desulfurized amine liquid by using mid-infrared spectrum. Background technique [0002] With the development of refining technology, the desulfurization of refinery gas and petroleum products has become one of the focus and key points of refining and chemical enterprises. Due to the continuous increase of the residual oil blending ratio, the sulfur content of the refinery gas increases rapidly, and most refineries use the amine method to remove hydrogen sulfide (H2S) with better desulfurization effect. 2 S) Process. The desulfurization amine solution in this process is divided into lean solution and rich solution. The rich solution is obtained by absorbing hydrogen sulfide from the lean solution. The content of hydrogen sulfide in the lean and ri...

Claims

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Application Information

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IPC IPC(8): G01N21/3577
Inventor 李敬岩陈瀑褚小立田松柏
Owner CHINA PETROLEUM & CHEM CORP
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