Please tell me the reason why MTBE turns yellow?

youduozhongyuanyin there are many reasons: Methanol excess ； Catalyst damaged ； Raw gas contains more than five carbon atoms ； Raw materials containing excessive sulfur ； Methanol purity is low

Reasons for the yellow color of MTBE: 1. Catalyst damage (caused by excessive temperature) ； 2. Isobutylene polymerization (small amount of methanol) When MTBE turns yellow, what is the reaction temperature? Is the reactor bed temperature rising too high? Check whether the isobutylene content in the raw material changes, and adjust the alcohol-to-ene ratio in time.

It is recommended to look for problems from the following aspects:: 1. Whether the color of the raw materials C4 and methanol meets the requirements. 2. Whether the catalyst has just been put into use. This phenomenon will also occur if the water washing and purification are not complete. 3. Whether the catalyst activity decreases. Call the DCS historical trend to check whether there is excessive temperature. 4. Check whether the sampling techniques and facilities are regulated. Check whether the sampling tube of the MTBE storage tank is rusty. 5. Increase the sampling frequency of raw material C4, preferably once every 2 hours, and provide timely guidance on production. At the same time, operators should strengthen the monitoring of bed temperature. 6. Confirm the accuracy and reliability of the analysis data (errors often occur and should be actively calibrated).

It is more likely that the methanol exceeds the standard, and it may also be because the impurities in the feed gas cause catalyst necrosis and cause MTBE to turn yellow!

Please give me some advice. If you know anything, please come back as soon as possible.

Can low methanol content also cause yellowing of horses? I don't think so

You can try adding diethylamine, it should solve the problem

1. If a wet-based catalyst is used, it is most likely that the MTBE is not washed thoroughly, causing the MTBE to turn yellow. 2. If the temperature of the reaction bed is too high, part of the catalyst will be coked and damaged, causing MTBE to turn yellow.

Factors that may cause yellowing of MTBE: 1) The mixed C4 raw materials used for MTBE production are yellow. These yellow substances enter the MTBE products and affect the color of MTBE. 2) The diene content in the C4 raw material entering the etherification reactor is large, and the self-polymerized polymer is yellow. This polymer enters the MTBE product and affects its color. 3) If the amount of methanol is small, isobutylene will self-polymerize, and the color of the self-polymer will turn yellow. This self-polymer will enter the MTBE product and affect its color. 4) The etherification catalyst is decolorized. This color is brown and may be brought into the MTBE product, affecting the color of the MTBE product.