Method and apparatus for evaluating hydrogen chloride evolution as a function of temperature

Method of construction of the apparatus for evaluation of hydrogen chloride as a function of temperature, characterized by comprising the following steps:

• a) support the flask (1) with oil (14) on top of the heating mantle (15) and secure it by the larger mouth to a universal mount-clip-clamp (2);
• b) lay the heating mantle (15) on an elevating platform (3), to adjust the height of the system;
• c) insert the stirring rod (5) into the PEEK connection (8) provided with retainers (9), which connect to the central mouth of the flask (1);
• d) use silicone grease to facilitate the passage of the rod (5) through the retainers (9);
• e) connect the rod (5) to the stirring motor (20);
• f) carefully place this assembly into the larger mouth of the flask (1) and attach it to the stirring motor (20), always checking the alignment of the system;
• g) connect the gas-dispersing tube (4) to one side of the flask (1);
• h) fit a hose (10) to the upper end of this tube through which the inert gas (nitrogen) from the flow controller (21) will pass;
• i) use two heating tapes (18), one for the upper part of the flask (1) and the other for the gas conducting tube (7), electrically connected;
• j) wrap one of the heating tapes (18) around the conducting tube, including the separating section in the middle of the tube (7);
• k) wrap the thermocouple (17) and leave its end as close as possible to the separating funnel, thus the tube assembly (7)+thermocouple (17) will be wrapped in the heating tape;
• l) attach the conducting tube (7) to the other side of the flask (1) with the help of PEEK connectors (8);
• m) wrap the second heating tape (18) on the upper part of the three-necked flask (1), particularly around the necks;
• n) electrically connect the two heating tapes (18) to two of the tapes' temperature-controlling wires (19);
• o) at the other end of the conducting tube (7), attach a small PTFE hose with a second gas-dispersing tube (11);
• p) place the immersed sintered glass (4) into a 250-ml beaker (13) with a predetermined amount of deionized water (190 ml), on which the assembly is supported on the titrator's magnetic stirring base (22);
• q) connect a second thermocouple (17) to the respective inlet of the flask (1), dipping its end into the paraffin oil (14) and away from the stirring propeller (5).