Methanol Weekly Topic: How to handle the numerous by-products generated in methanol production? 2015.11.02--11.09

Depending on the process route, the by-products of methanol production generally include sulfur, fusel oils, carbon dioxide, methanol residues, and so on

Depending on the production process, the by-products of methanol production generally include sulfur, fusel oils, carbon dioxide, and methanol residues, among others. The main by-products of coal-to-methanol production include dimethyl ether, ethanol, and alkanes such as paraffins. The formation of by-products can be reduced by controlling the quality of the gas fed into the tower, such as by minimizing the introduction of iron, nickel, and alkali metals; maintaining a stable bed temperature; using highly active catalysts; and reducing the amount of methanol fed into the tower.

The main methanol by-products are long-chain alkanes, namely paraffins, as well as other products such as dimethyl ether and ethanol. To reduce the formation of paraffin, the main methods are as follows: 1. Clean the pipes thoroughly before starting up the system, and use nitrogen purging to eliminate any residues; this helps to prevent the formation of iron carbide as a result of carbon monoxide and residual rust in the pipes during operation. Iron carbide, once introduced into the tower, not only affects the catalyst’s activity but also contributes to the formation of paraffin. 2. Avoid large fluctuations in operating conditions, as well as too rapid changes in bed temperature; high temperatures can lead to an increase in paraffin. During operation, carefully adjust the components to prevent excessive levels of carbon monoxide. 3. Avoid frequent start-ups and shutdowns; also, try to keep the bed temperature above 215 during operation, and do not allow the temperature to drop too rapidly after shutdown.

The main way to reduce methane production is to maintain a high hydrogen content along with a high space velocity. All of this is based on the assumption that both the bed temperature and system pressure are within normal ranges.

18061923257 is produced as a by-product of methanol recovery