【20090909 Focus Topic】Who can design this process route?
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This post was last edited by hhit2003 on 2009-9-9 11:39 There is a process: In a 5000L stainless steel reactor, put the catalyst sodium phenolate grains (melting point: 61-64°C), the material is in liquid phase (boiling point: 250-280°C), the reaction conditions are 10mmHg vacuum, and the hot oil is heated to increase the temperature (temperature rise range: Room temperature to 200°C), the catalyst is in a liquid state during the reaction. After the reaction is completed, the temperature is lowered to break the vacuum, and the sodium phenolate is filtered and reused. Related data: Sodium phenolate particles, particle size 0.3-1.0mm ； At the end of the reaction, the viscosity of the material in the kettle is 16000-18000cp (25℃) 40-60cp (100℃). The catalyst dosage range is 3-10kg/1 ton. Product design requirements: 1. Two routes are recommended: First, the catalyst is crystallized directly in the reaction kettle, the material is filtered out, and the catalyst is kept in the kettle for continuous use. ； Second, the catalyst is transferred to another filter kettle along with the materials for cooling and crystallization separation. 2. Minimize the number of equipment used. 3. It can meet the requirements of continuous production, has high filtration efficiency, and is easy to operate and backwash the filter. Now we need to design the process flow for the filtration and reuse of the catalyst sodium phenolate. I hope that experts can provide a simple and complete process flow (diagram) and equipment conditions (required equipment and types). If the design or idea is feasible, we will contact this friend to help us design it!
Doing 2.4-D? It looks like there are no ready-made operating procedures
1# hhit2003 The poster needs to answer a few questions first.: 1) The viscosity of the material after reaction at 45, 50 and 55 degrees ； 2) After the catalyst is precipitated, does the particle size change? ； 3) Is it feasible to put the catalyst into the reaction after containing a certain amount of product? ； 4) Is the product water-soluble?
Reply enthusiastically to Haiyou on the 3rd floor: 1) The viscosity range of the reacted material at 45-55 degrees is 1000cp to 8000cp ； 2) After the catalyst is precipitated, the particle size part is needle-shaped (diameter 0.3mm, length 3mm), and the rest is irregular spherical, but the particle size is mostly in the range of 0.3-0.8mm. ； 3) It is feasible for the catalyst to contain a certain amount of product before being put into the reaction ； 4) The product is not water-soluble.
At about 100 degrees, what is the density of the product?
This post was last edited by Hanguang Duanshui on 2009-9-9 10:45. What are the requirements for the residual amount of sodium phenolate in the product? Does it have a certain solubility for the catalyst? It is best to give a rough range for the amount of catalyst and reaction materials.
1. Cool down the reactor and discharge the material. High viscosity is not a problem. N2 is pressurized. The discharge pipe is appropriately enlarged and the temperature is maintained at the temperature of the sodium phenolate solid. 2. After discharging, directly pass through the plate filter. Because your solid can be seen with the naked eye, you can choose 8. 0 mesh or larger filter 3. What remains on the filter is sodium phenolate crystals, which can be discharged and recycled. 4. Regarding the type of equipment, it depends on your own pressure, flow rate, temperature, etc. Use stainless steel as much as possible for materials with high viscosity such as resins.
This post was finally edited by hhit2003 at 2009-9-9 12:06, who enthusiastically answered the 5th and 6th floor Haiyou: The temperature is about 100 degrees, and the product density is about 1.10. The product has higher requirements for the residual amount of sodium phenolate. Is the catalyst soluble in water but insoluble in the material (or has very little solubility)? The catalyst dosage range for one meal of reaction material is 3-10kg.
I have come into contact with materials such as fluororesin with a viscosity of 10000Cp (at normal temperature). I use diatomaceous earth for filtration and use a plate and frame filter, which is very easy to use! As the poster said, solid materials can be seen with the naked eye. The continuous circulation of the plate and frame filter and the mixing tank can definitely be filtered.
This post was finally edited by hhit2003 on 2009-9-9 12:06. The leader of the original poster put forward an idea.: At the end of the reaction, after the reaction kettle is cooled down until the catalyst crystallizes, a filtering device is added to the discharge port of the reactor so that the filtration process is completed. The catalyst is melted by heating the filtering device, and the material is backflushed back into the reactor to continue the next round of reaction! Please comment on this idea. Does anyone know the model of this filter device?
This post was last edited by wbzzip on 2009-9-12 11:59 10# hhit2003 I don’t know if the stainless steel filter backwash filter can meet your requirements. The backwash gas source is safe gas (based on the reactants). Under normal circumstances, the material is filtered under pressure. After filtration, a part of the preheated material is introduced into the filter. The preheated heat can come from the cooling heat at the end of the previous cycle. The temperature is greater than the melting point of the catalyst. After the catalyst on the filter is melted, the gas backwashes back to the reactor and enters the next cycle. The filter is made of stainless steel.