Water splitting training device

Water splitting training deviceProduction process principle

The cracking process involves the depolymerization and rearrangement of linear polydimethylsiloxane under the action of a catalyst (KOH) and vacuum heating conditions, resulting in the formation of cyclic polydimethylsiloxane with a certain number of chain links.

2. Production process

Hydrolyzed product storage tankmaterialsutraAfter 24 hours of settling, it is pressurized and transported by the feed pump of the cracking kettle, preheated to 120 ℃ by the hydrolysate preheater, and mixed with 50% KOH saturated solution through flow regulation before entering the cracking kettle. Control the ratio, hydrolysate: 50% KOH=1:0.0025 (V/V). The cracking kettle is a stirring kettle with a spiral coil heat transfer internal component. The jacket adopts steam pressure self-regulation, and the inner coil adopts temperature regulation. Under stirring, the hydrolysate and KOH solution in the kettle are thoroughly mixed and undergo catalytic cracking reaction. The parameter control of the cracking kettle is: temperature of (142-147) ℃, vacuum degree of -0.095MPa or above.

The result of the cracking reaction is linear rearrangement, generating aD4 is the main component of the ring, and its steam directly goes to the cracking tower. It enters from the bottom and undergoes vapor-liquid exchange with the reflux liquid at the top of the tower on the tray. After passing through the cracking tower, the steam enters the condenser, which uses circulating water as the cooling medium to control the temperature of the material outlet at 40 ℃. The condensed liquid phase mixed ring enters the cracking reflux tank, and after being pressurized by the reflux pump, some of it flows back into the tower through the flow control valve and controls the reflux ratio R=0.25. The remaining part is sent to the primary water boiling kettle in the purification system through the reflux tank level control valve. At the same time, the soft water from the soft water station is sent to the water boiling kettle after passing through the flow self regulating FIC and being preheated to 90 ℃ by the soft water preheater. Ring: Water=1:1 (V/V). Under the stirring effect of the boiling kettle, the mixed ring and soft water are thoroughly mixed in the kettle, and then overflow into the primary water separator for layering. By adjusting the LIC interface, the water separator maintains a certain oil layer, with the upper layer being the oil phase, which overflows into the secondary water boiling kettle, and the lower layer being the water phase. A small amount of free chlorine and potassium silicate impurities are discharged into the hydrolysis system with water and finally enter the settling tank. At the same time, the soft water from the soft water station is sent to the secondary water boiling kettle after passing through the flow self regulating FIC and being preheated to 90 ℃ by the soft water preheater. Ring body: water=1:1 (V/V), under the stirring effect of the secondary water boiling kettle, the mixed ring body and soft water are fully mixed in the kettle, and then overflow into the secondary water separator for layering. The purified oil phase enters the annular storage tank. After a period of settling in the annular storage tank, it is sent to the refining unit for further refinement. The lower aqueous phase enters the hydrolysis system and is finally discharged into the settling tank.

Cracking residual liquid in the cracking kettle is intermittently discharged into the forced drying kettle for forced drying, and the temperature of the forced drying kettle is controlled by a temperature regulating valveAt 150-160 ℃, with a vacuum degree of 0.097MPa, the evaporated gas-phase ring is cooled by the forced drying kettle ring cooler and enters the forced drying kettle ring collection tank. The forced drying oil must be regularly pumped into the hydrolysis product storage tank by the forced drying kettle ring transfer pump. The residue in the forced drying kettle is mainly potassium silicate, which is dissolved and reacted with water before being sent to the slurry pool and transported to the outside.