A kind of method and used device of melting trimellitic anhydride

Abstract

The invention discloses a method for melting trimellitic anhydride. The method comprises the steps of gradually setting incremental target temperature, enabling the amplitude of an electric heating aluminum bath melter to be small when the electric heating aluminum bath melter reaches the final target temperature by using the characteristics of aluminum blocks including good heat transfer characteristic, high melting point and deformation resistance, wherein the heat transfer is more uniform when the trimellitic anhydride is molten, a plurality of specimens can be subjected to heat transfer pretreatment, and a thin Nessler tube is fixed in the process of heat transferring, so as to maximally reduce the impact on the chromaticity of the specimens possibly caused by the different pretreatment conditions. The invention further provides an electric heating aluminum bath melter which realizes the method. According to the method, the electric heating aluminum bath melter is small in amplitude and is likely to be stabilized when the electric heating aluminum bath melter reaches the final target temperature by gradually setting the incremental target temperature; furthermore, the aluminum bath as a heat transfer medium is utilized to replace traditional water bath or oil bath and the like, and a heating system which is reasonable in design is combined, so that the heat conduction of the aluminum bath is quick, the heat transfer is uniform, and the efficiency of pretreating the trimellitic anhydride can be improved.

Description

technical field [0001] The invention relates to a method of utilizing the thermal conductivity of aluminum to uniformly transfer heat to heated organic crystals to melt them, in particular to a method for melting trimellitic anhydride, and also to a device for melting trimellitic anhydride, belonging to measurement and analysis technology field. Background technique [0002] The chromaticity index is commonly used in the evaluation of the quality of organic chemical products. For organic crystals that are solid at room temperature, the organic crystals are heated first to melt them, and then compared with the corresponding color scale to determine the color. Fusion color of organic crystals. [0003] The traditional method of melting organic crystals uses an electric heater as a heat source, and uses a water bath or an oil bath to transfer heat. There are some inherent defects in this way, such as: the corresponding heat transfer container needs to be done relatively large...

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Problems solved by technology

Moreover, there are often several parallel samples in one chromaticity measurement, or pretreatments such as melting of several samples at the same time, how to put several colorimetric tubes into a water bath or an oil bath for melting at the same time? Clamp and fix the Nessler colorimetric tube so as not to overturn or break the Nessler colorimetric tube

[0005] The current heating device generally uses a PID temperature control device, but if you do not gradually increase the set temperature, but set the heating device to the target temperature for heating at once, the electric power during heating will be very large, and the device will reach the target temperature. The temperature is too high, the temperature is not easy to stabilize, and it may make the PID temperature control invalid

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