Comparison between high-pressure alcohol alkylation and high-pressure alcohol alkanation

Regarding the comparison between high-pressure alcohol hydrocarbonation and high-pressure alcohol alkylation: Could someone please provide a detailed explanation of the differences between these two processes? For the new ammonia synthesis, purification, and refining facility with a capacity of 450,000 tons, is it better to use high-pressure alcohol hydrocarbonation or high-pressure alcohol alkylation? Could you also give details on how your company uses these processes, including the investment costs, operating expenses, and the lifespan of the catalysts? :kiss: :kiss: :call: :call: :time: :time:

Go and take a look down there; it’s described in quite detail. http://bbs.hcbbs.com/viewthread.php?tid=57246&highlight=%B4%BC%CD%E9%BB%AF

Is the owner’s 450,000 t/a ammonia synthesis plant a single-unit or dual-unit setup? If it is a single-unit low-pressure synthesis system, then the alcoholization and alkylation processes are not very suitable; it is recommended to use a dual-washing process, although this results in higher initial investment. However, in terms of operational stability and economic performance, the dual-washing approach offers better results.

Regarding the comparison between high-pressure alcohol hydrocarbonation and high-pressure alcohol alkylation: Could someone please provide a detailed explanation of the differences between these two processes? For the new ammonia synthesis, purification, and refining facility with a capacity of 450,000 tons, is it better to use high-pressure alcohol hydrocarbonation or high-pressure alcohol alkylation? Could you also give details on how your company uses these processes, including aspects such as investment costs, operating expenses, and the lifespan of the catalysts? :victory: :victory: :call: :call: :kiss: :kiss: :handshake :handshake

Our company uses the technology from Hunan Anchun Company for its dual-methyl process; there is an article here that might be useful to you. http://bbs.hcbbs.com/redirect.php?goto=findpost&pid=2043205&ptid=384242

Purification processes for several feed gases used in ammonia synthesis. The purification of the feed gases for ammonia synthesis is a crucial step in the production process; even trace amounts of excess CO and CO2 can cause the ammonia catalyst to become poisoned and stop functioning. At present, most small and medium-sized nitrogen fertilizer plants in China that use coal as a raw material and employ fixed-bed gasification rely on the copper washing method. This traditional copper washing technique is an outdated purification method with disadvantages such as the need for numerous pieces of equipment, complex processes, cumbersome operation, high material consumption, and it also constitutes a major source of environmental pollution during production. With the development of sulfur-resistant low-temperature exchange catalysts and advanced desulfurization technologies, small and medium-sized nitrogen fertilizer plants have recently begun to use processes such as methanol production, methanation, dimethyl production, and alcohol-oil conversion at various pressures for the purification of feed gas, as alternatives to copper washing. These new feed gas purification methods are gradually becoming more refined and mature, and they exhibit clear advantages over the traditional copper washing method. 1. Traditional copper wash purification process: This method has been in use since 1913, involving the absorption of CO, CO2, H2S, and O2 using an ammonia solution containing copper salts under high pressure (around 12.0 MPa) and low temperature (8–12°C). The solution is then regenerated under reduced pressure (45–60 mmHg) and at elevated temperatures (76–78°C). The process of using copper-ammonia solution to remove the main gaseous impurities CO and CO2 from the raw material gas used in ammonia synthesis is commonly referred to as \"copper washing.\" The copper salt ammonium solution is called \"copper solution,\" while the purified gas is known as \"copper-washed gas\" or \"refined gas.\" 1.1 Shortcomings of the traditional copper washing purification process The traditional copper washing purification process has been used in small and medium-sized nitrogen fertilizer plants for decades, and it is still in use in most of these plants today. Although its performance varies from plant to plant, it has many shortcomings in general. 1.1.1 Copper washing is a process prone to accidents in ammonia synthesis production. Due to the long process flow, numerous equipment involved, and the fact that the composition of the copper melt is affected by various factors, accidents of varying severity have occurred in copper washing operations at various plants. Many plants have encountered problems such as excessively high levels of trace (CO+CO2), liquid in the copper towers, clogging of equipment packing, fluctuations in the composition of the copper melt, and difficulties in adjusting the copper ratio; these are processes prone to accidents. 1.1.2 High material consumption in the copper washing purification method: During gas purification, the copper solution requires the addition of ammonia, copper, and acid. It absorbs impurities at low temperatures and releases them for regeneration at high temperatures, which results in both heat and cooling energy (steam and electricity) being consumed. The copper solution absorbs (CO+CO2) during the purification process, and it also dissolves H2, reducing the effective amount of usable gas. Even with systems in place for regeneration and recovery, gas losses still occur. The operating costs for copper washing vary from plant to plant, with differences in material consumption; however, they are generally not less than 50 yuan per ton of NH3, and it is not uncommon for them to reach even 100 yuan or more per ton of NH3. 1.1.3 Leaks at the copper cleaning site represent a management challenge. Copper melt leakage and the emission of recycled gases contaminate water bodies and the atmosphere, hindering the improvement of enterprises’ environmental protection efforts. 2. Copper washing combined with methanol production for purification: At present, a considerable number of small and medium-sized nitrogen fertilizer plants have added a methanol production process prior to copper washing. The production of methanol not only increases the range of chemical products available to these enterprises, but more importantly, it reduces the burden associated with copper washing and purification; as a result, the processes of conversion and decarburization become less demanding. The overall benefits of this approach are evident. Export CO: 2.0%–5.0%; Export CO2: 0.4%. Schematic diagram of the co-production process (omitted). 2.1 Process for co-producing methanol: The reactions involved in co-production are as follows: CO + 2H2 → CH3OH; CO2 + 3H2 → CH3OH + H2O. In many plants, the co-production of methanol is added after the ammonia synthesis unit starts operating. Given the production processes of small and medium-sized nitrogen fertilizer plants and the characteristics of their compressors, this co-production process is usually carried out before copper washing, at the same pressure level of 10–13 MPa; this is referred to as medium-pressure co-production of methanol. The process flow diagram for liganol production is shown in Figure 1. 2.2 Production operation of lysozyme The production technology for lysozyme is highly mature; the internals in the synthesis tower are mostly of the uniform temperature type, while the catalysts used are primarily C207, C301, and Wc-Ⅰ (Ⅱ). For the temperature-induced reduction of catalysts, refined gas is commonly used; the NH3 and sulfur contents in this gas must be strictly controlled, with H2 accounting for 70%–75%. During the temperature-raising reduction phase, it is advisable to maintain low temperature and pressure conditions when discharging water in order to enhance catalyst activity. A key aspect in ensuring stable production of lysoalcohol is to properly manage the purification of gases entering and leaving the system; it is required that the shift gas undergo wet desulfurization, so as to control the total sulfur content in the lysoalcohol-producing gases

Please ask a friend to explain in detail the double-washing process; we use single-unit low-pressure synthesis. Thank you!:handshake :handshake :call: :call:

Regarding the comparison between high-pressure alcohol hydrocarbonation and high-pressure alcohol alkylation: Could someone please provide a detailed explanation of the differences between these two processes? For the new ammonia synthesis, purification, and refining facility with a capacity of 450,000 tons, is it better to use high-pressure alcohol hydrocarbonation or high-pressure alcohol alkylation? Could you also give details on how your company uses these processes, including aspects such as investment costs, operating expenses, and the lifespan of the catalysts? :victory: :victory: :call: :call: :kiss: :kiss: :handshake :handshake

Our company uses the alcohol-to-hydrocarbon conversion technology provided by Hunan Anchun for the production of 30 Wt/a of synthetic ammonia. To date, this system has been in operation for 8 months. The investment in a single set of such conversion equipment is around 4,200 W (including pipelines; this figure has been calculated), with the total investment estimated to be around 7,000 W. Under normal conditions, the service life of the conversion catalyst is approximately 3.5 years. The concentration of CO and CO2 in the gas flowing from the conversion tower to the ammonia tower is less than 10 ppm, indicating good operational performance that fully meets the production requirements. Alcohol alkylation and alcohol hydrocarbylation each have their advantages and disadvantages: Advantages: 1. Both alcohol alkylation and alcohol hydrocarbylation allow for adjustment of the alcohol-to-ammonia ratio within a wide range according to market demands (the ratio can be adjusted between 1:20 and 1:1). 2. Both methods can meet production requirements, with levels remaining below 10 ppm under normal operating conditions. 3. Energy-saving and environmentally friendly. 4. Low daily consumption. Disadvantages: Alcohol alkylation produces methane; the ammonia tower requires a larger vent volume; methanation catalysts are expensive. Alcohol alkylation products are difficult to handle; in contrast, alcohol alkylation is more mature and widely used. :L :L :L :L

Each has its advantages; they should all be quite mature: handshake :handshake