Determination method and application of hydrogen sulfide content in methanol solution

A technology of methanol solution and determination method, which is applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as difficulty in popularization and use, expensive instruments and equipment, etc., and achieve the effect of ensuring absorption capacity

Active Publication Date: 2016-03-09
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are not many relevant reports about the determination method of hydrogen sulfide content in the regenerated methanol solution in industrial production at present. In actual production, some use instrumental analysis method, but the price of the instruments and equipment adopted is relatively expensive, and it is difficult to popularize and use

Method used

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  • Determination method and application of hydrogen sulfide content in methanol solution
  • Determination method and application of hydrogen sulfide content in methanol solution
  • Determination method and application of hydrogen sulfide content in methanol solution

Examples

Experimental program
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Embodiment 1

[0036] A. Preparation of detection reagents:

[0037] a. Deionized water deoxygenation: pass distilled water through an ion exchange column to obtain deionized water, and pass nitrogen gas (purity > 99.99%) to saturation to remove dissolved oxygen in the water. The water used in this experiment was double distilled water.

[0038] b. Prepare p-aminodimethylaniline solution: weigh 2g of p-aminodimethylaniline hydrochloride [NH 2 C 6 h 4 N(CH 3 ) 2 ·2HCl] dissolved in 200mL of water, slowly add 200mL of concentrated sulfuric acid, dilute to 1000mL with water after cooling, shake well, the concentration is 2g / L.

[0039] c. Prepare ferric ammonium sulfate solution: weigh 2.5g of ferric ammonium sulfate [Fe(NH 4 )(SO 4 ) 2 12H 2 O], dissolve in water containing 5mL of concentrated sulfuric acid, dilute to 250mL with water, shake well, the concentration is 10g / L.

[0040] d. Preparation of zinc acetate-sodium acetate solution: weigh 50g of zinc acetate (ZnAc 2 2H 2 O) a...

Embodiment 2

[0056] Wherein the steps of A, B, and C are the same as in Example 1, except that the specific conditions in step D, such as the heating temperature of the three-necked flask, the amount of raw materials added, and the nitrogen flow rate, etc., are specifically shown in Table 2.

[0057] The methanol solution to be tested used in Examples 1-2 is 200 mL of regenerated methanol solution in the "low temperature methanol washing" section of Shaanxi Shenmu Chemical Industry Co., Ltd.

[0058] In order to further verify the accuracy of the present invention's method for measuring hydrogen sulfide content in methanol solution, take respectively 200mL of regenerated methanol solution in the "low temperature methanol washing" section in Example 1 and Example 2, respectively adopt the assay method of the present invention, total sulfur analysis The content of hydrogen sulfide in the regenerated methanol solution was determined by the instrumental method, and the results were compared, se...

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Abstract

The invention discloses a measurement method for hydrogen sulfide content of a methanol solution and application of the measurement method. The measurement method comprises the following steps of constructing an absorbancy-hydrogen sulfide content standard curve; preparing a methanol solution to be measured into a sample to be measured; testing the sample to be measured through a spectrophotometer to obtain an absorbancy value of the sample to be measured; and obtaining a hydrogen sulfide content of the sample to be measured from the absorbancy-hydrogen sulfide content standard curve according to the measured absorbancy value. The hydrogen sulfide content of the methanol solution can be obtained by constructing the absorbancy-hydrogen sulfide content standard curve, preparing the methanol solution to be measured into the sample to be measured, measuring the absorbancy value of the sample to be measured and obtaining the result. The method is applied to liquid in actual production, so that the hydrogen sulfide content of a 'rectisol' solution can be measured accurately and conveniently, and therefore, the deficiency of the methanol solution can be determined, and the absorption capacity of the methanol solution in a purification process is guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical quantitative determination, in particular to a method for determining the content of hydrogen sulfide in methanol solution and its application. Background technique [0002] In the industrial production of coal-to-methanol, coal is gasified and transformed to produce process reaction gas. Due to the simultaneous presence of multiple complex elements in coal, a large amount of hydrogen sulfide is often produced during the gasification process of coal. Hydrogen sulfide is a major harmful substance in the synthesis of methanol from coal. It can poison the copper-based catalyst in the synthesis reaction, seriously affect the service life of the catalyst, and lead to production termination in severe cases. Therefore, in the industrial production of methanol, the shift gas must be purified before entering the synthesis tower to remove sulfides in the reaction gas. [0003] At present, in the industria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 朱伟罗刚崔普选
Owner CHNA ENERGY INVESTMENT CORP LTD
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