Methanol Section: Daily Question, April 11: Reducing substances in methanol products?
Thread Content
In the quality standards for methanol, there is a potassium permanganate test. So, which substances in pure methanol products are reducing agents? Are these substances generally removed in the pre-column stage, or are they removed gradually throughout the entire distillation process? If the potassium permanganate test fails, how is it generally adjusted? This post was last edited by lanseqinghai on 2009-4-11 14:33]
Substances containing unsaturated bonds, such as methyl formate, certain aldehydes, and unsaturated hydrocarbons. The vast majority of the highly boiling reducing substances are removed in the pre-tower, and they exit behind the pre-tower. If the potassium permanganate test fails, carry out extraction distillation in the pre-distillation tower; more water can be added to the pre-reflux tank to control the condensation temperature at the top of the tower. In a pressurized atmospheric distillation column, the reflux ratio is increased to prevent the heavier components from rising.
Aldehydes and similar reducing substances in the same category.
The potassium permanganate pressure test, also known as the oxidation time, is an important indicator for assessing the quality of methanol. The reducing substances involved are mainly unsaturated aldehydes; this can be determined through chromatography. To control the quality of methanol, it is necessary to manage parameters such as the top temperature and reflux ratio properly, thereby increasing the purity of methanol and reducing the amount of reducing substances