Exploration of methods to improve gasoline octane number

The octane rating of the gasoline I use is around 92, and the quality of the raw material is good at present. It was previously blended with MTBE.

1. Straight-run gasoline is sent for de-reforming, partially blended, or exported directly to address the issues associated with straight-run gasoline. . . 2. Use catalytic gasoline blending with MTBE and MMT to directly sell 93# gasoline. . . 3. Reformat the oil and blend it with steam, straight gasoline, and MTBE to obtain 97# gasoline. . . :lol

1. Hydrocracked heavy naphtha can be used as a feedstock for catalytic reforming; it can be utilized directly. Moreover, due to its high aromatic content (usually above 50%), it yields high amounts of aromatics, as well as gasoline with a high octane rating. 2. Using MTBE to blend catalytic gasoline also yields a higher octane rating

Here, MTBE is mainly used in blended gasoline to increase the octane rating

High-octane components: aromatics, olefins, isohydrocarbons, some oxygen-containing compounds. The above components can be fully utilized to improve octane number. 1. Reforming can increase octane rating. 2. Alkylation can increase octane number. 3. Isomerization can increase octane number. 4. Blending can produce high-octane gasoline. 5. There is another process called gasoline upgrading, which lies between reforming and isomerization. 6. High-octane blending components are used to produce high-octane gasoline through blending.

A refinery located in a remote area of the western region has adopted atmospheric stripping reforming, partial isomerization techniques, and catalytic gasoline upgrading methods. However, the octane rating of the gasoline produced is generally only at the level corresponding to 90# gasoline, failing to meet the standards for 93# gasoline. The price difference between these two grades at the factory gate is nearly 200 yuan per ton. Moreover, the use of octane boosters such as MTBE is not feasible due to the high transportation costs associated with importing MTBE from inland areas. If, in the future, environmental regulations are strictly enforced to limit the aromatic content in reformed gasoline, as well as the olefin content and manganese content in catalyzed gasoline, it may become more difficult to maintain the octane rating; hence this issue is raised for discussion.

There are many types of additives; taking 90->93 as an example, the addition amount is 0.1%, with the cost kept within 50 yuan per ton； If the Beijing standards require s to be within 170, it is roughly within 150

It all acts as a catalyst; then why not invest in vaporization units and MTBE plants? The investment required isn’t high either. . . 200,000 in terms of value plus 50,000 in MTBE – the investment is only around seventy to eighty million. . . Any oil refining company can do it. . . :lol Last edited by wangsc on 2009-2-27 10:57 ]

The plant’s catalytic capacity is only 150,000 tons per year, so it is difficult to install many units.

Catalytic gasoline accounts for a large proportion in gasoline; it is necessary to improve the quality of catalytic gasoline, especially its octane rating.

How can new processes and catalysts (or octane-improving catalysts) be used in the catalytic cracking process to increase octane number? Could someone with experience share some insights? The books mention a ZSM-5 type zeolite octane booster; I wonder if any refineries have used it, what the specific industrial product code is, and what its effectiveness is This post was last edited by hgshy on 2009-2-28 11:11]

In my opinion, MTBE is not a panacea. When I was in college 15 years ago, MTBE was widely used and recognized in North America, but later concerns arose regarding the potential environmental hazards that its release into the environment might cause (which have not yet been proven). As a result, North America and Europe no longer advocate for its widespread use. It would be good if there were no hazards, but what if problems arise after 50 years of extensive use of MTBE? Isn’t it too late? Unfortunately, China is currently promoting its use vigorously, but it always moves half a step slower than foreigners. This post was last edited by hgshy on 2009-2-28 11:18.]

The octane rating of gasoline produced by catalytic units is generally between 91 and 93; with the addition of a small amount of straight-run gasoline, along with appropriate amounts of MTBE and MMT, the gasoline can be adjusted to 93# or 97# grade； In terms of process, the straight-run gasoline is modified using a de-reforming unit, while the catalytic unit employs a production process designed to yield high-octane gasoline; operationally, the reaction depth is increased appropriately, high-octane gasoline catalysts are used, and octane-boosting additives are added.

The simplest and most effective approach is to use gasoline additives such as MTBE, MMT, and other high-octane components. Another option is to modify the gasoline production process, which requires investment and technical expertise

The atmospheric crude gasoline produced by our plant can be converted into lead-free 90-octane gasoline through reforming and hydrogenation, and then sent to a benzene extraction unit to produce benzene-free gasoline. To increase the octane rating of gasoline, blending components can be added; currently, MTBE and MMT are widely used and yield very good results!

(1) Influence of raw material properties. An increase in naphthenes and aromatics in the feedstock raises the octane rating of gasoline, while reprocessing gasoline lowers its octane rating. (2) Effect of catalyst activity. The catalyst activity increases, leading to an increase in the hydrogen transfer reaction and a decrease in the octane number of gasoline. (3) Effect of reaction time. Reducing the reaction time can minimize secondary reactions, increase the olefin content in gasoline, and raise its octane rating. (4) Effect of reaction temperature. As the reaction temperature increases, the ratio of the hydrogen transfer reaction rate to the cracking reaction rate decreases; the olefin content in gasoline rises, and its octane number increases. (5) Effect of the additive ratio. As the oil-to-agent ratio increases, the conversion rate rises and the octane number increases (6); an increase in the carbon content of the regenerator leads to an increase in gasoline octane number

MTBE possesses good chemical and physical stability; it does not easily form peroxides in air. Its toxicity is very low, and it does not pose serious risks to human health during production and use.

Blending reformed gasoline with catalytic gasoline is a good approach.

Straight-run gasoline is de-reformed, and it can be blended again after reforming. Catalytic gasoline has a high octane rating and is generally used as an octane booster. The main methods for increasing gasoline octane number include reforming, alkylation, isomerization, blending, octane boosters, and the etherification of light gasoline, among others.