Dividing head

Perfluorobutyric acid [375-22-4] M 214.0, m -17.5", b 120"/735mm, d 1.651, n 1.295, -0.17. Fractionally distd twice in an Oldershaw column with an automatic vapour-dividing head, the first distn in the presence of cone H2SO4 as a drying agent. 

After the hourly heat load is calculated, the capacity of heat source machine would be decided. As total heat produced by heat source machine should be identical to total heat load, the capacity can be calculated dividing head load... 

Fractionally distd twice in an Oldershaw column with an automatic vapour-dividing head, the first distn in the presence of cone H2SO4 as a drying agent. 

Retsch rotary divider PT 100 consists of a feeder unit with a dividing head that rotates at 110 rpm this means that with a dividing head with 10 outlets the feed is split into 1100 aliquot parts per minute. The feed can range from a few grams to 5000 ml depending on the size of the collecting... 

Automatic vapour dividing head (Collins and Lantz)... 

The dividing head, which is used to hold the workpiece, is clamped to the table of a milling machine using the central tee slot for alignment. If necessary, a tailstock to support the other end of the workpiece, also located in the central tee slot, is clamped at the other end of the machine table. 

A workpiece is required to have (a) 14 divisions and (b) a n umber of slots 23° apart. Calculate the dividing head settings if the supplied index plate has 21.23.27.29.31 and 33 holes. Answer, (a) 2 turns and 18 holes in a 21-hole circle and (b) 2 turns and 15 holes in a 27-hole circle.)... 

In this fourth edition I have included, by request, additional material including gas welding and the dividing head. I have updated to the current health and safety legislation in Chapter 1 and in relation to abrasive wheels, power presses and manual handling and pictures of machine guards have been added. The section on adhesives has been... 

Alcoholysis of a-monoalkylacetoacetic esters may be accomplished in excellent yields by heating with catalytic amounts of alkoxide in excess abs. ethanol. The startg. m. must be dry and free of acetoacetic ester.— E Ethyl a-allylaceto-acetate added to a soln. of some Na in 2.5 moles of abs. ethanol, refluxed under a column packed with glass helices and fitted with an automatic liquid-divider head, distillation started when the temp, at the head has dropped from 78 to 72 , the b. p. of ethanol-ethyl acetate azeotrope, the take off ratio adjusted to maintain the vapor temp, at 72-73 , and excess ethanol removed on a water bath when after 22 hrs. the calculated amount of azeotrope has been collected ethyl 4-pentenoate. Y 88%. F. e. s. J. J. Ritter and T. J. Kaniecki, J. Org. Chem. 27, 622 (1962). 

The point of connection of the vacuum gage to the system shall be as close as practical to the reflux dividing head. The connecting tubing must be of sufficient diameter to ensure that no measurable pressure drop occurs in the line. In no case shall the vacuum gage connection be near the vacuum pump. 

---