Polypropylene emerging technology development momentum is strong

In recent years, as technology matures and continuous optimization of market allocation, petrochemical industry, the olefin present diversified development trend of raw materials, especially under the background of double carbon, a big Bob propane related news, is the power of Leon’s desire, and the traditional oil olefin/coal to olefin/methanol to olefins, propane dehydrogenation process in propylene yield was high The raw material of the single Short process, low investment cost, high economic advantages stand out But the advocate of propylene, propane dehydrogenation process products by-product hydrogen, single source of raw materials can only be maintained polypropylene production of general material, with the arrival of a new round of expansion cycle of polypropylene makes increasingly highlight structural mismatch between supply and demand, the development of high-end polypropylene become the main means of differentiated competition, in this round of competition, propane dehydrogenation PP technology competitiveness began to fell, although there is a part of the enterprise However, the lack of ethylene has become the short board of PDH process. Meanwhile, China lacks relevant resources and the supply capacity of light hydrocarbon is insufficient. Most of the raw material resources need to be imported, so the stability of raw material supply becomes the key to the development of light hydrocarbon process From 2014 to 2018, the typical project was propane dehydrogenation. However, since 2018, the popularity of light hydrocarbon cracking has risen rapidly due to its stronger flexibility and ductility. Some pilot projects have been put into production in 2020.

The ethylene yield of ethane, propane and butane cracking is high. For light hydrocarbon comprehensive utilization enterprises, the ethylene yield has a very obvious impact on the downstream chemical production, and the downstream route selection has higher flexibility and selection space. The process with higher propylene yield is PDH MTP C/MTO, but the target product of light hydrocarbon cracking has a higher yield and can also produce high purity hydrogen as a by-product, which has been regarded as one of the important ways to reduce petroleum dependence and energy consumption of the industry. Therefore, the development momentum of domestic light hydrocarbon cracking projects is very rapid, and many new players who do not have the ability to process crude oil have also entered With the continuous development of light raw materials, the ways to obtain propylene are increasing. After propane dehydrogenation, light hydrocarbon cracking projects are gradually increasing. Propane is not only the raw material for dehydrogenation to produce propylene, but also the main raw material for light hydrocarbon cracking to produce propylene. What is the difference in product structure between propane dehydrogenation and light hydrocarbon cracking? Which process will be more competitive in future production facilities? Rise a propane as the main raw material production technology Propylene shortage in our country, the traditional deputy range of propylene production cannot meet the increasing demand of domestic propylene derivatives, at the same time, the Middle East and north American shale gas development makes propane production surge in exports a large increase, to the rise of domestic propane technology provides enough raw materials to support A simple approval process The short and rapid investment effect of propane dehydrogenation projects has brought opportunities to the economic development of coastal areas in China. Propane dehydrogenation and mixed alkane dehydrogenation projects are rising in China. The process of producing olefin by cracking light hydrocarbon as raw material is rising One or two kinds of butane) as raw materials for the cracking of olefin enterprises gradually increased, such as Boralidek Basle Petrochemical Xinpu chemical Huatai Shengfu and other two kinds of production process Propane dehydrogenation, as a new process to produce propylene from propane as a single raw material, produces more propylene than light hydrocarbon steam pyrolysis, but there are also problems of low one-way conversion rate and high requirements for raw materials. The propylene yield of the plant can reach more than 80%, which can bring a large amount of raw materials supply for propylene downstream Light hydrocarbon cracking can not only improve the propylene/ethylene yield ratio of the unit, but also make full use of the resources of the refinery, which is the development direction of the raw material composition of the cracking unit. Under the condition of full propane circulation, the diene yield of light hydrocarbon cracking process can reach more than 60%, and the products produced are more abundant than propane dehydrogenation

Propane dehydrogenation alternaria alternata propylene by-product hydrogen gas, if the by-product hydrogen without sales channels, can only burn as fuel gas, will directly affect the economy of propane dehydrogenation, compared with light hydrocarbon cracking, propane dehydrogenation (hydrogen burn) the unit cost of olefin is relatively higher than propane dehydrogenation process, main products of light hydrocarbon cracking for ethylene propylene, by-product hydrogen fuel gas mixture of carbon four Mixed carbon five, can solve the propane dehydrogenation itself without ethylene and butene regret, pyrolysis of the by-products can once again realize their own value, at the same time has the advantage of low cost, can be in the market of unregulated copolymerization and impact copolymerization, more economic in recent years The hydrogen energy industry has a strong policy driving force. At the same time, with the increase of the number of terminal application scenarios, the market demand side has also gradually boosted the hydrogen energy industry to a certain extent, and most of the domestic propane dehydrogenation enterprises have begun to pay attention to or even layout their own sales channels and utilization plans for hydrogen by product In this case, propane dehydrogenation, whether sold as industrial hydrogen or as more expensive fuel cell hydrogen or even high purity hydrogen, will provide an economic return and thus boost the profitability of propane dehydrogenation companies. By comparison, propane dehydrogenation technology has a short process and low consumption High yield and low investment cost of a single set of devices. If it can be combined with surrounding refining devices to provide hydrogen for refining and maximize benefits through mutual supply of raw materials, the advantage of light hydrocarbon cracking lies in the large investment scale, variety of products and strong ability to resist market risks. The economy of the two mainly depends on ethylene and Propylene price: The propane dehydrogenation route is more economical when ethylene and propylene prices are close, and the light hydrocarbon cracking route is more economical when ethylene prices are higher than propylene

Propane dehydrogenation raw material single, only using propane as raw materials, product only propylene and by-product hydrogen, low carbon environmental protection not only, still can reduce the risks of other factors, is still the present new into the enterprise’s main technological choice, the vast majority of China’s production of PDH device matching downstream device, industry integration trend obviously, but the long run, the downstream industry chain development space is narrow, Market pressure is great, in the domestic polypropylene production capacity doubled in the fierce market competition, ethylene propane dehydrogenation project’s competitiveness is worth re-evaluation.

Compared with propane dehydrogenation, light hydrocarbon cracking process has more diversified product solutions and stronger market impact. Comparatively speaking, the economy of propane dehydrogenation process mainly depends on the price difference between propylene and propane. When the market price of propylene fluctuates and declines, the economy of propane dehydrogenation process will be greatly reduced.

For polypropylene industry, propane source accounts for a small proportion, although it has increased from 7% in 2015 to 15% in 2022, it still does not occupy the mainstream in the market and has a weak right to price polypropylene products. However, with the continuous development of lightweight energy and chemical raw materials in China, the diversification trend of upstream crude oil sources of polypropylene is turning, and with the advent of “propane” era, it will not be far before naphtha, propane and coal will be divided into three parts of the world.


Post time: Jul-11-2022