Method for determining sulfur dioxide in waste gas discharged by methanol plant

Abstract

The invention discloses a method for determining sulfur dioxide in waste gas discharged by a methanol plant. The method comprises the following steps: S1, drawing a correlation curve of sulfate concentration and absorbance; S2, sampling the waste gas discharged by the methanol plant through an air sampling system; S3, aerating the absorbed absorption liquid in a clean air environment for a certain time; S4, transferring the absorption liquid into a volumetric flask, and adjusting the absorption liquid to be acidic by using a hydrochloric acid solution; S5, taking the absorption liquid, firstly adding a stabilizer, and then adding a barium chloride solid; S6, determining the absorbance of the turbid barium sulfate solution in a visible area of the visible spectrophotometer, and comparing the absorbance with the correlation curve in S1 to determine the concentration of sulfate; and S7, converting the content of sulfur dioxide in the waste gas discharged by the methanol plant. The method is time-saving, labor-saving, simple and quick in operation process, accurate and reliable in measurement result and suitable for measuring sulfur dioxide in industrial waste gas of methanol plants and the like.

Description

technical field [0001] The invention relates to the technical field of measuring sulfur dioxide, in particular to a method for measuring sulfur dioxide in waste gas discharged from a methanol plant. Background technique [0002] After sulfur dioxide is discharged into the air, it accumulates in large quantities to form acid mist or acid rain, which is an important precursor of environmental acidification, and the formed aerosols will also aggravate air smog and deteriorate air quality, which is harmful to the surrounding environment, crops, animals, plants and The harm of the crowd is extremely great, therefore, sulfur dioxide has been identified as a key pollutant in the air environment by the environmental protection department. A certain amount of sulfur dioxide will be produced during the production process of the methanol plant. If the control is not in place during the production process and the three wastes are not properly disposed of, they will escape into the ambie...

AI Technical Summary

Problems solved by technology

A certain amount of sulfur dioxide will be produced during the production process of the methanol plant. If the control is not in place during the production process and the three wastes are not properly disposed of, they will escape into the ambient air, causing serious pollution to the surrounding environment, and causing health hazards to nearby people. Therefore, In the production process of methanol plants, it is necessary to strengthen the monitoring of sulfur dioxide in the tail gas

Currently commonly used sulfur dioxide determination methods include "HJ 483-2009 Determination of Sulfur Dioxide in Ambient Air Tetrachloromercuric Salt Absorption-Pararosaniline Spectrophotometric Method", "HJ / T 57-2000 Potential Electrolysis Method for Determination of Sulfur Dioxide in Exhaust from Stationary Pollution Sources", "HJ / T 56-2000 Iodometric Method for the Determination of Sulfur Dioxide in Exhaust from Solid Pollution Sources", in which potassium tetrachloromercury used in the tetrachloromercuric salt absorption method is highly toxic and poses a great hazard to the health of operators. Analysis of waste Improper handling will also cause environmental pollution. The instruments used in the constant potential electrolysis method are relatively heavy and bulky, and it is time-consuming and laborious to take samples at the discharge port. The iodometric method is cumbersome, time-consuming, and low in analysis efficiency.

Images