Allihn condensers

Condenser (Allihn type, or equivalent), 400mm long (min)... 

A Erlenmeyer flask-, 500-ml B Condenser, Allihn type, 400-ml C Water trap... 

An efficient bulb condenser (Allihn) was used to prevent loss of bromine. 

A 5-I. three-neck round-bottom flask is provided with an efficient mechanical stirrer, a 48-cm. Allihn reflux condenser, a thermometer, and a 500-cc. separatory funnel, the stem of which reaches nearly to the bottom of the flask (Note 1). 

B. o-Nitrobenzaldehyde. A suspension of 51.6 g. of the diacetate in a mixture of 500 g. (272 ml.) of concentrated hydrochloric acid, 450 ml. of water, and 80 ml. of alcohol is stirred and refluxed for 45 minutes. The mixture is then cooled to 0°, and the solid is filtered with suction and washed with water (Notes 6 and 7). The crude product is purified by rapid steam distillation through a 100-cm. Allihn condenser into a cooled receiver. About 3.5 1. of distillate is collected during 30 minutes the cooled distillate is filtered, and the o-nitrobenzaldehyde is dried in a desiccator over calcium chloride. It weighs 23.7 g. (74%) and melts at 44-45°. 

Synthesis of CHDM/BA and CHDM/PDA Polyester Resins Described in Tables III and IV. CHDM, brassylic acid (or dodecandioic acid) and "Fascat 4100 in a mol ratio of 2/1/0.005 and 5 wt % of xylene were placed in a three-necked, 250-mL round-bottomed flask fitted with line, a thermometer, an Ace temperature controller, a heating mantle, a mechanical stirrer, a steam-heated Allihn partial condenser with a xylene-filled Barrett moisture test receiver below the Allihn condenser and a total condenser above it. The mixture was heated to about 140 without stirring to melt the reactants and stirring was started. Heating was continued to 205 C. A slow N sweep was maintained throughout the reaction. About 95 to 100% of the theoretical water was collected in the Barrett receiver. Upon cooling the reaction mixtures partially solidified to white waxy solids which liquified when heated to about 40 C. Acid numbers were < 1 mg of KOH/g of resin. 

A. Triphenylarsine. In a 2-1. round-bottomed three-necked flask is placed 130 g. (5.65 gram atoms) of powdered sodium covered with 900 ml. of benzene. The flask is fitted with an Allihn condenser, a mercury-sealed mechanical Hershberg stirrer, and a 500-ml. dropping funnel in which is placed a mixture of 170 g. (0.94 mole) of arsenic trichloride and 272 g. (2.42 moles) of chlorobenzene. About 10 ml. of the arsenic trichloride-chlorobenzene mixture is dropped into the flask, and the reaction mixture is stirred and heated on a steam bath until it darkens and boils spontaneously. The steam bath is removed, and the remainder of the arsenic trichloride-chlorobenzene mixture is added drop-wise, with stirring, over a period of 1-1.5 hours at such a rate that gentle boiling is maintained (Note 1). When the addition is complete, the mixture is stirred and heated under reflux on a steam bath for 12 hours. 

Allihn condenser. The inner tube of a Liebig condenser is modified by having a series of bulbs to... 

An internal water-cooled coil allows for efficient condensation of low-boiling vapors and prevents condensation on the outside, which might seep into joints. The checkers used an Allihn condenser. 

Replace the still head with the Allihn condenser and reflux the heterogeneous light-brown mixture for 4 h during this period the mixture becomes homogeneous and dark brown. 

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