Discussion on the process of producing propylene via liquefied gas cracking
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Which marine professional has worked with or been exposed to the process of producing propylene through liquefied gas cracking? Please provide information on production index control and equipment efficiency!
It falls under light hydrocarbon cracking; the technology in China is not yet mature, and our factory also wants to install such a system
This post was last edited by qhywyy on 2011-10-22 at 18:19. The production of propylene via LPG cracking involves the cracking of the olefin compounds in LPG to produce propylene; alkanes can also be cracked, but this process is more costly and results in a lower conversion rate. Its cost-effectiveness is likely to be quite high in the current chemical applications of liquefied gas, and domestic technology is already mature.
If it is Shaanxi Coal’s technology, large-scale industrial facilities should already be under construction, with a capacity of 500,000 tons per year
Reply to 4# Wang Yangzhi Zhou: Shaanxi Coal uses the technology developed by Dahuai Research Institute, namely the fluidized bed process route; at present, only pilot testing has been completed.
There are basically no mature industrialization technologies in the country; if such technologies are to be developed, foreign technology must be used.
The construction of large-scale industrial facilities has already begun, and they are likely to be of world-class scale as well. On June 10, 2011, Shaanxi Coal Chemical Technology Engineering Center Co., Ltd. and Huayou Technology Co., Ltd. signed the first technology licensing agreement for the production of propylene from mixed C4 hydrocarbons. The total investment for this project is planned to be 1.6 billion yuan, with an annual processing capacity of 500,000 tons of mixed C4 feedstock; it is expected to be completed and put into operation by the end of 2012. Mixed C4 hydrocarbons are major by-products of the petrochemical industry and the coal-to-olefins industry; at present, the vast majority of them are mixed into liquefied petroleum gas as a fuel for domestic use, resulting in low utilization value. The propylene production technology from mixed C4 hydrocarbons, independently developed by Shaanxi Coal Chemical Technology Engineering Center Co., Ltd., enables the conversion of C4 olefins while also allowing for partial conversion of C4 alkanes.
This post was last edited and replied to by qhywyy on 2011-10-22 at 18:22. Reply 6# jbx1656: Domestic technology has been capable of driving for several years now, and it works very well. In fluidized bed technology, it is necessary to raise the reaction temperature in order to enable a small portion of alkanes to also participate in the cracking process, similar to the KBR process. However, the loss of fluidized bed catalysts needs to be monitored.
Is the yield that high? Doubtful! According to reports from abroad, the KBR technology does not achieve such a high propylene yield either, right? In other words, 100 tons of ordinary liquefied petroleum gas in use in the market can produce 45 to 50 tons of propylene? Whoever takes on this project will surely make a fortune, right?
This post was last edited by qhywyy on 2011-8-9 at 16:20. The active component in the raw material is olefins, and the yield of propylene referred to is the mass yield based on the tetraolefins. For example, with 100 tons of C4 feedstock and an olefin concentration of 50%, the production of propylene is approximately 25 tons.
1. The liquefied gas available on the market currently has a butene content of around 30–40%; it is difficult to find liquefied gas with a butene content of over 50%； Moreover, the higher the butene content, the higher the price. 2. What are the yields for products other than propylene, such as dry gas and gasoline?