SU875267A1 - Thermogravimetric device - Google Patents

Description

(54) THERMOGRAVIMETRIC DEVICE

I

The invention relates to weighing measuring instruments and can be used for the continuous measurement of the mass of bulk material, which varies as a result of interaction with a passing through a non-gas flow. A device for continuous weighing of small mass in a gas flow containing a glass reaction vessel is known inside which, on the elastic quartz helix, hangs a basket with the test substance, an electric heater, a measuring optical recording-change system 1.

The disadvantage of this device is that part of the gas passes between the basket and the walls of the reactor without interacting with the sample under investigation, as a result of which uncontrolled and non-adjustable conditions for the reaction are created. On the indications of weights su-:

The effect is greatly affected by the speed of the run. gas treacle. In addition, the device operates at atmospheric pressure or under vacuum.

It is also known thermogravimetric device containing a vertical case, a frequency weighing sensor located along the axis of the case, electromagnetic transducers and a heater located

10 coaxially above the body 2.

However, the performance of the sensor in the form of a plate does not allow one to investigate the change in mass of the emitting substances upon their interaction with the reaction gas flow under flow conditions; External airflow does not give positive results, since it does not allow to control the gas flow through the layer. Moreover, the arrangement of electro-magnetic converters in the immediate vicinity of the test substance does not allow it to be heated to high temperatures without disrupting the normal operation of the electro-magnetic converters. The purpose of the invention is to improve the measurement accuracy by adjusting the hydrodynamic mode in the working part of the sensor. This goal is achieved by the fact that the frequency load cell is made in the form of a tube, the working end of which is located in the heater. Additionally, in order to ensure optimal operating conditions of the device, electromagnetic transducers are installed inside the case opposite the weight meter. The drawing shows a longitudinal section. Thermogravimetric device containing a vertical case 1, a frequency weighing sensor 2, placed along the axis of the housing, magnetic solenoid transducers 3 and a heater 4 located coaxially above the case, a frequency weighing sensor 2 made in the form of a tube, the working end 5 of which is located in the heater. Electromagnetic transducers 3 are installed inside the case opposite the weight measuring sensor 2. The device operates as follows. 74 The reaction gas is supplied to the lower part of the body between the tube and the body 1 and, cooled by electromagnetic transducers 3, is fed to the heating zone 6, passes through the weight of the test substance and is removed from the gravimetric device. The registration of the mass change is carried out with a frequency meter with information sent to the printing device or through a converter to a recorder, calibrated in units of mass (not shown). Example. The dried and reduced alimoplatinum catalyst is subjected to zakokosovyvanie indenom at 490 C, the volumetric feed rate of the raw material of 1.0 h and the molar ratio of hydrogen: raw material -1: 1. The process is carried out in parallel on the scales of McBen and on the gravimetric installation of the proposed design. The results of the experiment are given in the table. From the table it can be seen that when carrying out the process at the proposed plant, the catalyst was coked to a great depth. This is due to the fact that in this case the entire gas flow passed through a portion of the catalyst, while at the time, only a part of the gas flow was involved in the interaction with the catalyst.

Claims (2)

Claim 1. A thermogravimetric device comprising a vertical housing, a frequency load cell placed along the axis of the body, electromagnetic transducers and positioned coaxially above the different purpose of increasing accuracy by adjusting the hydrodynamic mode in the working part of the sensor, the frequency load cell is made in the form of a tube, the working end of which is located in the heated part of the case 6 under item 1, about t l and the fact that, for the purpose of the heater, the housing, the fact that, with measurements 2. In order to ensure optimal working conditions, electromagnetic transducers are installed inside the cooled part of the housing opposite the load cell.