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To Aspearine1: yes, the level measurement is to be tied to automated controls, so a sight glass is no solution.

We have a level measurement problem that seems trivial but until now no valuable solution has been found. We need to measure the level in a small glass reactor (jacketed) of 20 L (diam. 20 cm, height 70cm). The reactor has filterplate at the bottom. Solvent (DMF) is pumped in the reactor at the...

To 25362 and others: I measured the pressure at the suction side of the gear pump: -60 mbar. Reactor was at atmospheric pressure. The reactor (diam. 102mm) contained 30 cm of water. The flow was 50L/h (measured during pumping). The filter (in the bottom of the reactor)has a pressure drop of 2.5...

To 25362: the solid particles are the product (reactions on solid supports).

To 25362's 1st question:no, both tests were exactly performed in the same conditions. To 25632's 2nd question: it should be possible to measure pressure in suction line, but not yet done (equipment ha sto be modified a little bit). I will consider to install a pressure gauge in the suction line...

Answer to both 25362 and phex: Dear 25362, Both filtration tests were performed starting from a settled suspension. And I repeat: the filtration with the pump was done without recicrculating the liquid back to the reactor. The partcle size diameter was the same in both filtrations. So I drained...

Reply to 25362's question: everything was equal in both filtrations. If you want, I can give you the filtration times: without pump: 100 ml in 32" 200 ml in 75" 300 ml in 134" with pump: 100 ml in 10" 200 ml in 21" 300 ml in 33"

I would like to reply on the comment of 25362. Without recirculating back to the reactor, I have drained the reactor, once by opening the valve at the bottom of the reactor, and once by draining it through the pump. The draining by the pump was 3 to 4 times faster. If 25362's comment is right...

We have a small reactor with a filter element in the bottom. The reactor is working at atmospheric pressure. The reaction mixture is a suspension. During reaction the liquid part of the suspension is pumped by a gear pump from the filter (reactor) outlet back to the top of the reactor. The flow...

Yes, this could be a solution. I was rather thinking of adding a molecular sieve.

Water-ethylbenzene azeotrope: bp 92°C, 33% water Further I have (not exactly what you are looking for, but perhaps it can help you): 1,1,1-trichloroethane: Bp 88°C, 4 % water Dichloromethane: bp 39°C, 2 % water

There is always some small amount of water present in the DMF (due to water that is formed during reactions performed on the other functions on the esters).

How can the solvolysis of esters be avoided? We are actually performing reactions in DMF at room temperature with functionalized carboxylic acid esters. The ester function has to stay intact. However, some of the ester is hydrolyzed. We know that DMF (polar solvent) enhances the formation of the...

Having read several articles about microwave assisted chemical reactions, it is not completely clear for me whether the reactions are not just enhanced by the temperature increase provoked by the microwave irradiation, or is there really a pure microwave effect? In other words, would this...

Dear all, thank you very much for all your efforts. Our mixture toluene - H20 is very rich in toluene. We use a glass reactor with a double jacket. The reactor is equiped with an agitator (speed 500RPM) and the reactor has a height of approximately 20 cm. In my opinion the mixture is well...

Dear Chris, > thank you for your help. Your data match our predicted values, but the > predicted values do however not match the experimental data. In our lab > scale trial a 3 wt%aqueous solution of a organic molecule (with very high > molecular weight) is continuously fed at +-140g/h into a...

My e-mail address is paul.tastenhoye@ucb-group.com

I am looking for the water-toluene azeotrope composition at reduced pressures for which the mixture boils at mbareratures below 40°C (e.g. 50 mbar and 100 mbar. Can anyone help me?