Technology for producing high-octane gasoline from liquefied gas via aromatization

The “catalyst for the low-temperature aromatization and alkylation of liquefied gas to produce high-octane gasoline” developed by the Dalian Institute of Chemical Physics possesses independent intellectual property rights, demonstrating strong innovation and practicality. Addressing the shortage of high-quality gasoline blending components in China and the ineffective utilization of large amounts of refinery liquefied gas, this achievement involves the synthesis of several new types of molecular sieve materials. Based on the successful synthesis of MCM-22/ZSM-35 co-crystalline molecular sieves with an adjustable ratio of MCM-22 to ZSM-35, catalysts of this type with appropriate acidity and pore properties were developed through various modification methods. These catalysts are used in the low-temperature aromatization process of refinery liquefied gas, offering advantages such as high activity at low temperatures, good aromatic selectivity, and reduced amounts of pyrolysis gas. The developed co-crystalline molecular sieve catalyst achieves a C4 olefin conversion rate of >95% and a liquid yield of >98%; the gasoline product contains >50% aromatics and a certain amount of benzene

Study on GTA-I Process 1: Catalyst Properties The catalyst used in the GTA-I process, which takes the C4 fractions produced by catalytic cracking units as raw material, is the proprietary LAC-1A type liquefied gas aromatization catalyst; its main properties are shown in Table 1. Table 1 Catalyst Properties Item LAC-1A Bulk density/kg•m-3 710 Pore volume/ml•g-1 0.16 Specific surface area/m2•g-1 256.8 Radial crushing strength/N•cm-1 102 Main process parameters 1. Reaction temperature: 460–520°C. 2. Reaction pressure: 0.1-0.4 Mpa. 3. Reaction mass space velocity: 0.2～0.3 h-1. 4. Catalyst service life: over 2 years. Industrial applications of GTA-I technology – Main process flow: 1. Reverse reaction system: It uses a fixed-bed reaction mechanism and can operate in continuous or batch mode. The reaction section is equipped with a raw material preheating furnace and a fixed-bed reactor. The regeneration system is equipped with a regeneration gas heater. During continuous operation, one set of reactors is used for each reaction; when the catalyst activity declines, the feed is directed to another set of reactors. While the reaction takes place in the reactor, another set of catalysts with lower activity is regenerated, keeping the entire operation continuous. 2. Product separation: The reaction products consist of rich gas and liquid products; the rich gas enters the absorption and stabilization system. Since the raw material is mixed C4, the liquid products resulting from the aromatization reaction contain >90% aromatics. 3. Regeneration system: Nitrogen from the system and purified air (for supplementation) are metered in proportion and fed into the regeneration gas separation tank where they are separated. Thereafter, they enter the regeneration gas heat exchanger, where they exchange heat with the circulating gas; after that, they go to the regeneration gas heater to be heated to the temperature required for the aromatization reaction, after which they burn from the top of the bed layer, moving downward. Supply air as needed, based on the changes in the reactor bed temperature. 2 Properties of raw materials The GTA-I process has been industrially applied in two pilot plants, and the properties of the raw materials used are shown in Table 4. Table 4: Raw material composition of industrial units, in v%. Composition: Unit-I, Unit-II – C2: 0.82, 0.87 (≤C3 component); C3H6: 0.29; C3H8: 20.68, 54.47; C4H8: 43.72, 54.47; C4H10: 32.4, 42.91; ≥C5+: 2.09, 1.75, 4.3. Material balance and product distribution: The material balance for the two units is shown in Table 5, the composition of liquid products is given in Table 6, while the distribution of liquefied gas and dry gas products is shown in Tables 7 and 8. Table 5 Material balance of the GTA-I process in industrial units, % Material balance Unit-I Unit-II Dry gas + losses 16.64 16.80 Liquefied gas 42.82 28.20 Mixed aromatics 40.54 55.00 Reaction temperature/°C 450–470 460–480 Table 6 Composition of liquid products, % Composition Unit-I Unit-II Non-aromatic C5 6.35 3.24 Benzene 13.23 19.24 Toluene 39.04 42.84 Ethylbenzene 2.16 0.85 Xylenes 24.75 23.11 Heavy aromatics 14.47 10.72 Total aromatics 93.65 96.76 Table 7 Composition distribution of liquefied gas, v% Composition Unit-I Unit-II C2 0.17 10.32 C3H6 0 0 C3H8 79.91 72.33 C4H8 0 1.23 C4H10 19.92 15.32 ≥C5 0 0.78 Table 8 Distribution of dry gas products, v% Composition Unit-I Unit-II H2 49.53 40.26 CH4 + air 20.92 23.71 C20+C2= 16.69 19.82 ≥C3 12.86 16.07 Last edited by guoguangyu1 on 2008-3-22 16:31]

The technology is now very mature. QQ976047357

The technology at the Dalian Institute of Chemical Physics is not yet mature and has not been industrialized; the situation in Luoyang is also unsatisfactory.

Dalian University of Technology possesses the relevant technology; it has undergone industrial trials, and there are corresponding catalysts available. The industrial facility is owned by Shandong Qiwangda Group Haizhong Petrochemical Co., Ltd

Do the students upstairs have better skills? Why don’t they share them for discussion?

Dear teachers, this is my first time working on liquefied gas aromatization projects, and I urgently need the operating procedures related to this area. Could you please send them to me? I would be extremely grateful. My email address is: GQLLB2009@126.COM

This post was last edited by kate_jack on 2010-1-8 at 09:21. Beijing Huiersanjie Green Chemistry Technology Co., Ltd.’s technology for producing gasoline through the aromatization of liquefied gas is currently being transferred; those interested can call for inquiries at 010-82898757 or 010-62965088. Additionally, since the company’s website is currently under upgrade and renovation, technical information related to this aspect will be made available online later. The company is currently seeking partners across the country for its two technologies: liquefied gas aromatization for gasoline production and dry gas aromatization for gasoline production.

16# sunnychem86 Hello, this technology belongs to our company, and we also use our own catalysts. You can call us for more details. Below is a brief introduction to our company’s technology; it is currently being updated, and new information will soon be available on the website. There is also a dry gas-to-gasoline project seeking partners; since I am not very familiar with the technology, those who are interested should call for further details. Our company’s R&D center has recently developed a technology for converting liquefied gas into gasoline. This technology uses liquefied gas from refineries, propylene-free liquefied gas, or propylene-isobutylene-free liquefied gas as raw materials to produce petroleum products such as gasoline and vehicle-grade liquefied gas. Catalyst: The SMART-LTG type molecular sieve catalyst developed by Whirlpool Three G Company, along with the corresponding process, is used. This catalyst is produced by modifying and metal-coating shape-selective molecular sieves; it facilitates the polymerization and aromatization of olefins to yield liquid components with high octane numbers. It boasts advantages such as resistance to caking, reusability, water resistance, and sulfur resistance. Process characteristics: (1) This process enables a gasoline yield of over 40%. The octane rating of the produced gasoline can reach over 90# (according to the research method). The product, being a liquefied petroleum gas with low olefin content, can also be used directly as a fuel for household use. It features low environmental pollution and low energy consumption, and holds very broad market prospects for development ； (2) This process utilizes the heat of reaction as a heat source for stabilizing towers, distillation towers, and raw material preheating, thereby making full use of energy and reducing energy consumption ； (3) Emission of \"three wastes\": The amount of oily wastewater emitted in this process is extremely low ； During normal operation, no polluted exhaust gases are released into the atmosphere. According to the flue gas monitoring data, the levels of SO2 and NOx in the exhaust gases emitted after the fuel burns in the heating furnace are below the **emission standards ； No waste residue is generated. Reaction conditions: Temperature 320-450℃ ； Pressure 1.0–1.2 Mpa (gauge pressure) ； Weight airspeed 1.25 h-1 (1.5–3.0 h-1)

What are the feedstock conditions under which the above-mentioned LTG technology achieves a gasoline yield of over 40%? Is it okay if the olefin content is low?