Which is simpler to analyze, the methanol content or the impurities?
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This post was last edited by zjp on 2013-5-10 14:35. It’s simple and practical to determine the methanol content! Is there a relationship between the pH value of methanol and its mass?
1. If it is pure methanol, **standard methods** can be used. 2. If methanol is an impurity present in other organic substances, gas chromatography can be employed for detection. 3. For methanol present in water bodies, headspace sampling can be used for quantification
It is finished methanol. Is the pH related to the quality of methanol?
Standard Number: GB 338-2004 Standard Name: Methanol for Industrial Use Standard Status: Current English Title: Methanol for industrial use Replacement Standard: GB 338-1992 Implementation Date: 2005-05-01 Issuing Authorities: General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of China Summary: This standard specifies the requirements, testing methods, inspection rules, as well as aspects related to labeling, packaging, transportation, storage, and safety for methanol used in industrial applications. This standard applies to industrial methanol synthesized from coal, tar, natural gas, light oil, and heavy oil as raw materials. This product is mainly used in the chemical industry, pharmaceutical industry, and pesticide sector, and can also be used as fuel. http://222.173.194.17/foodstandard/file1/20060802180209_200608021751_GB338-2004.rar Standards of the People’s Republic of China – Methanol for industrial use
It’s impossible to test everything in raw material analysis! Some of those elements are more important, while others are relatively less significant!
The simplest method is gas chromatography – a chromatograph with a capillary system equipped with a FID. PEG-20M or FFAP can be used as the column; the results are quite good. You might give it a try; if you have any issues, contact me at QQ 94007321
Gas chromatography can be used, along with a wide-range data processing system; quantification is carried out using the area normalization method, yielding very stable results.
The specific analysis indicators need to be determined in line with the requirements of the manufacturing process. Different target products and different processes require different focus areas; this matter should be handled by those responsible for the process development, with analysis following up thereafter
I have seen methanol being determined using gas chromatography before, and the results were fairly good.
The analysis method depends on the specific content to be tested.
Gas chromatography analysis is the best choice, as it is more accurate. FID polarized column
Normally, the analysis of methanol in methanol production plants is relatively simple, as it is carried out in accordance with national standards; if it is necessary to analyze the components of methanol, then gas chromatography is required.
If it is a finished product, the content can be determined by using a densitometer and referring to the relevant tables. As for the pH value, it is related to workshop control.