Dimethyl ether catalyst

Thank you to the original poster for sharing; if the formatting is improved, the result will be even better!

Has it been used in industrial installations? It seems that what you say about driving and activation doesn’t match reality.

This post was last edited by xlm19589 on 2009-6-9 at 11:40. It’s from our company after all – who is the original poster? Let me guess: D. I took a look – it’s not someone from our company. May I ask, OP, where are you from? :) ～～～～～～～～～～～:) (Edited; please post this content under the appropriate category.) I have organized the post made by the original poster as follows: Dimethyl ether catalyst TCM-1. The TCM-1 catalyst is a solid acid catalyst used for the gas-phase synthesis of dimethyl ether from methanol. It features high activity, good selectivity, excellent thermal stability, a low operating temperature, and a long service life, making it an effective catalyst in the current production process of dimethyl ether. I. Basic Composition and Physicochemical Properties: The TCM-1 catalyst mainly consists of γ-Al2O3 and SiO2, with a small amount of catalyst promoters. The main physical parameters are as follows: 1. Appearance: slightly red or white; 2. Dimensions: cylindrical, 3–4×10–20 mm; 3. Bulk density: 0.68±0.1 Kg/l. II. Applications: The TCM-1 catalyst is used in the catalytic reaction process for the production of dimethyl ether from methanol via gas-phase dehydration. III. Quality indicators 1. Methanol conversion rate: ≥85.0%; Dimethyl ether selectivity: ≥99.5% (reaction temperature: 260–350°C, pressure: 0.1–1.0 MPa). 2. Radial crush strength: ≥110 N/cm. 3. Static water absorption: ≥60%. 4. Wear: ≤5%. IV. Startup procedures 1. Activation conditions: Gas source: Nitrogen; Pressure: Atmospheric pressure – 0.4 MPa; Space velocity (h^-1): ≥200. Activation schedule: Temperature (°C), Heating rate (°C/h), Holding time (h), Total time (h): Room temperature → -100°C: 40–50°C, 0 h; -100°C → 300°C: 20–30°C, 0 h; 300°C → 250°C: Natural cooling. 2. Normal operating conditions: Operating temperature: Inlet to catalyst bed: 250–320°C; Outlet from catalyst bed: 260–320°C. Operating pressure: 0.6–1.0 MPa; Liquid space velocity: 1–2 h^-1. 3. Catalyst service life: Under normal operating conditions, the catalyst can be used for more than three years. If improper operation leads to a decrease in catalyst activity, necessary measures can be taken to address the issue; for example, if activity declines due to overheating, oxygen-containing gases can be introduced and used under specific conditions to restore the catalyst’s activity ； If the temperature exceeds the limit significantly or the catalyst becomes inactive for other reasons, it needs to be replaced. V. Performance characteristics of the catalyst 1. High activity: The main components of catalysts used for the gas-phase synthesis of dimethyl ether from methanol, both domestically and internationally, are γ-Al2O3 and SiO2. Our company’s TCM-1 catalyst also consists primarily of γ-Al2O3 and SiO2, with a small amount of auxiliary catalysts; as a result, the one-pass conversion rate of methanol is higher, reaching 88–90%, which is 3–5 percentage points higher than that of other catalysts. 2. Good selectivity: This catalyst has been used in other similar facilities in the country for over 2 years, and the data we have collected show that the normalization rate is above 99.5%. 3. The catalyst has wide operating conditions. Factory instructions: ● This catalyst can operate for extended periods under conditions of 250 at the inlet and 360 at the outlet. ●It can operate for a long time at lower air velocities and pressures without carbon deposition. ●After frequent driving and long periods of idling, the catalyst activity remained unchanged. Those interested, please contact me within the site! :)

:The handshake information is really detailed; I searched for days before finally finding this info. Thanks for sharing it.

Hehe. These materials are easy to download. Both the Southwest Chemical Research Institute and Chengdu Tianyi Chemical have such catalysts. You can search on Baidu.

Good material. Which company are you from? 4# xlm19589

Thank you, it matches what our company needs – an activated gas source; no activation is required

Who has the technical specifications for the CNM-3 catalyst? Thank you

Pingmei Lan Tian (Suiping) Chemical Co., Ltd. uses a methanol vapor dehydration process for the production of 200,000 tons per year of dimethyl ether. The reactor used is a homogeneous temperature reactor, and the catalyst filled in this reactor is the WD-1 dimethyl ether catalyst produced by Wuhan Collin Fine Chemicals Co., Ltd.; the amount of catalyst used is 50.0 m3. The unit operates in a hot-start mode, using hot nitrogen as the gas source to continuously raise the temperature of the catalyst bed. Once the catalyst reaches its active temperature, it is switched to methanol feed gas. Heating procedure: From room temperature to 120°C, with a heating rate of 30°C/h; maintain at 120°C for 2 hours. 120–160°C, with the temperature rising at a rate of 20–25°C/h, and remaining constant at 160°C for 2–3 hours. Once the temperature of the entire bed layer is evenly and stably established, switch to methanol gas for the dehydration reaction. Initially, the methanol temperature is maintained at 180–210°C, and the liquid-to-air flow rate is kept around 0.3 h-1. Once the reactor temperature stabilizes, the methanol inlet temperature is adjusted to 200–220°C, and the liquid-to-air flow rate is gradually increased to an appropriate value. The driving process took a total of 24 hours. The temperature rise of the catalyst was relatively smooth, with no occurrence of excessive temperature increases; it was in line with the designed temperature rise pattern. When the temperature at the reactor inlet reached around 200°C, the temperature in the upper part of the catalyst bed exceeded that of the inlet, at which point methanol began to be converted into dimethyl ether and the catalyst became active, indicating that it has a low activation temperature. As can be seen from Table 1, the catalyst bed temperature is uniform, with low hotspot temperatures. Product quality and methanol consumption: The dimethyl ether content in the product is 99.9%, with a methanol consumption of ~1.40 t per ton of dimethyl ether. One-way conversion rate of methanol: The operation results show that the conversion rate of methanol is ~85.3%. Selectivity of dimethyl ether: Results from a period of operation indicate that the selectivity of dimethyl ether is ~99.9%. The operational performance of the system shows that the WD-1 dimethyl ether catalyst produced by Wuhan Colin Fine Chemicals Co., Ltd., when used in isothermal reactors, features a low activation temperature, a high methanol conversion rate, few by-products, and high selectivity for dimethyl ether.

The Sanji Chemical Factory in the Princess Ridge **Agricultural Science and Technology Park, in collaboration with Northeast Normal University, has developed the JH202 catalyst for the production of dimethyl ether through the gas-phase dehydration of methanol. This catalyst has been granted a **patent; it features high activity, excellent selectivity, a wide temperature range of operation, good thermal stability, and a long service life, making it an efficient new catalyst for the conversion of methanol into dimethyl ether. Application range: The JH202 catalyst is suitable for the process of producing dimethyl ether by methanol dehydration in a gas-phase method. This catalyst is suitable for the dehydration of pure methanol or crude methanol (i.e., the product obtained from the synthesis of methanol without distillation) to produce dimethyl ether. Quality indicators: 1. Crushing strength: Radial value ≥ 100 N/cm. 2. Wear: ≤ 5% (usually 3–4%). 3. Activity (reaction temperature: 260–320°C, reaction pressure: 0.1–1.0 MPa). Methanol one-way conversion rate: ≥ 75%. Dimethyl ether selectivity: ≥ 99%. Service life of the JH202 catalyst: Under normal operating conditions, the JH202 catalyst can last for more than 2 years. Over-temperature incidents are the main cause of reduced catalyst activity and shortened lifespan.