【Alkylation】Alkylation acid consumption
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This post was last edited by Xiao Gong 1985 on 2016-2-18 at 14:44. To all those involved in alkylation production； Please share how much acid is consumed in your respective alkylation units, and what methods are used to manage this. Feel free to exchange ideas so we can all learn from each other.
1. The acid consumption mainly depends on the properties of the alkylation raw materials; it is necessary to analyze the impurities in these materials and take appropriate measures. 2. Add water to the tower to remove methanol. 3. Install a coalescer. 4. The alkene-to-alkane ratio should not be too low. 5. Keep the reaction temperature at a normal level. I hope these five suggestions can be helpful to you.
Normally, a reactor consumes 0.8 tons of acid per hour. But it also depends on what your raw materials are. How much impurity is there inside? For example, methanol, water, dimethyl ether, and other such oxygen-containing compounds can significantly dilute the concentration of your acid. So, to minimize acid consumption, first, you need to control the impurities in your raw materials; secondly, you need to control your operating procedures. I hope this helps you.
0.05~0.08t of waste acid per t of product. As mentioned above, the key factors are the properties of the raw materials and the reaction conditions. Methanol, MTBE, and dienes in the former will produce acids weighing several times to dozens of times their own weight ； In the reaction, too high a temperature or too low an alkene-to-olefin ratio can both lead to an increase in acid consumption. (Question for experts: Is the acid consumption during the reaction due to the formation of by-products, or is it caused by the reaction of olefins with acid to form sulfates?) ）
There are essentially two reasons for acid consumption: chemical acid consumption – sulfuric acid reacts with the impurities in tetrahydrocarbons, resulting in the formation of sulfonate esters； Physical acid consumption: Sulfuric acid has been diluted.
The top priority is to control the raw materials, followed by optimizing the processes. Raw materials represent a major issue, as most companies have quite diverse sources of raw material procurement, which makes it difficult to exert control over them; therefore, they can only upgrade their own systems.
It is mainly determined by the impurities in the raw materials, such as moisture, butadiene, dimethyl ether, methanol, H2S, etc.; accordingly, dehydration units, selective hydrogenation, and dimethyl ether removal can be used. The good value for acid consumption is 50 KG per ton of isooctane, while the poor value is around 100 KG