Advantages of Catalytic Cracking
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As a conversion process, catalytic cracking has better conditions than other conversion processes, mainly: Large scale per unit (up to 10 million tons/year/set), low construction and operating costs, product flexibility, etc. ； Produces propylene and other low-carbon olefins and provides chemical raw materials. Advanced catalytic cracking technology is combined with special catalysts to produce clean fuels and basic chemical raw materials.
Coking is developing well now, but I don’t know the pros and cons of the two processes and their future prospects.
The biggest advantage of coking is that it has a wide range of raw materials for processing, low cost, and good benefits. However, it wastes resources by turning oil into coke.
Catalytic cracking has been severely impacted in its current role as the catalyst in oil refining units. There are two main reasons:: 1. Crude oil tends to be inferior, with high sulfur and high metal content. It is difficult to adapt to heavy oil catalysis, and the slag-adding ability is reduced. ； 2. Environmental protection requirements. Catalytic gasoline and diesel cannot leave the factory directly and need to be hydrogenated. Instead of doing this, it is better to go directly to hydrocracking. ；
If we consider the long term, we can hydrotreat the raw materials first and then proceed to catalytic cracking, which will have good prospects.
1. I am in favor of direct hydrocracking or hydrotreating followed by catalysis. . . 2. Delayed coking is currently very effective, but my country does not yet have the promising fluid coking technology. . . :lol
Both catalysis and coking must use hydrogenation as the backing of product quality, otherwise the products will not be qualified: lol
Delayed coking has the advantages of low investment, low operating costs, and high conversion depth. Delayed coking has developed into one of the most important processing methods for lightweighting residual oil. Therefore, in the current situation where my country's funds are tight and the contradiction between supply and demand of light oil products, especially diesel and gasoline, is outstanding, delayed coking is one of the more ideal means to solve this contradiction.
Since hydrocracking products are mainly branched chain alkanes, their light component products are not suitable for use as gasoline. Generally, refineries mainly rely on catalytic cracking to produce gasoline. As crude oil continues to deteriorate, the process combination of catalytic cracking and FCC raw material hydrotreating is still very promising. This post was last edited by cainiu on 2009-2-14 12:26 ]
The catalytic cracking unit is an important secondary petroleum processing unit. Its products include propylene, ethylene, liquefied gas, gasoline, light diesel oil, etc.； It can be directly sold as fuel products or used as raw materials for subsequent chemical equipment, with low cost and high efficiency. Nowadays, there are more and more catalytic cracking family processes, the catalyst is more usable, the ability to handle heavy raw materials is enhanced, the products are flexible and diverse, the scale of the equipment is getting larger and larger, the energy consumption is getting lower and lower, the cost is getting lower and lower, and the prospects are promising.
As far as diesel products are concerned, catalytic diesel may not be of high quality, and it is difficult to meet new environmental standards even after hydrogenation. It is better to obtain it through hydrocracking. but: Catalytic gasoline has low aromatic content and high olefin content, which is complementary to the catalytic reforming unit with high aromatic content and low olefin content. It is a good gasoline blending component. Of course, in order to cope with future environmental protection standards, corresponding measures for pre-hydrogenation and post-hydrogenation are also needed. Catalytic cracking is currently a very important source of olefins in the world, especially propylene, a large part of which comes from catalytic units. Currently, global propylene demand is growing faster than ethylene, and the rapidly developing ethane cracking of ethylene in the Middle East does not produce propylene by-product. Propane cracking is limited by the source of raw materials, and coal-to-propylene can only supplement the market. Therefore, in a certain sense, the catalytic cracking unit is still very necessary and will still have great development, but the technology still needs to be further updated and upgraded.