Potassium Bromide CAS 7758-02-3

It solves the technical problem that the traditional method of Fourier transform infrared can not carry out infrared scanning on the single particle of diamond mineral smaller than 1mm. , place the sample to be tested in the hollow sample chamber of the potassium bromide base, and then place it under the infrared microscope, close the door of the infrared microscope, evacuate and fill with argon, and scan and analyze the sample to be tested. The concentration distribution of N element.

The potassium bromide base uses pure potassium bromide tablet as the base of diamond single mineral, which solves the problem of background interference when other substances fix extremely tiny minerals.

1) Grind the potassium bromide particles and dry them in a vacuum for later use;
2) Put PBA in a volumetric flask, and use good solvent CHCl3 to make up the volume to completely dissolve PBA;
3) adding KBr to the prepared PBA solution to obtain a KBr blend solution;
4) Add ionized water to the obtained PBA solutions with different contents of KBr, and ultrasonically sonicate the volumetric flask at room temperature to prepare PBA/KBr suspension casting solution;
5) The obtained PBA film casting solution is subjected to spin coating method to obtain a composite film, and the solvent CHCl3 is completely volatilized at room temperature, and then vacuum-dried for 6 hours;
6) Incubate the prepared composite film at a constant temperature to eliminate thermal history;
7) Incubate the composite film that has eliminated the thermal history at a constant temperature to make it completely recrystallized;
8) Cool the fully crystallized product in step 3) to room temperature and wait for detection; the process is simple and scientific, the cost is low, the process is controllable, and it is expected to be industrialized production, with great potential application prospects and economic benefits.

1. Ethanol, water and o-nitrobenzaldehyde are stirred and mixed, and the temperature is raised to the point where the solid o-nitrobenzaldehyde is completely dissolved.
2. Add reduced iron powder, add 3-5 drops of hydrochloric acid dropwise, fully stir and continue to heat up until the reaction system reaches the reflux temperature, and keep stirring for reaction.
3. The reaction solution is suction filtered, and the mixed solution of bromine, potassium bromide and water is stirred dropwise in the gained filtrate, and after the dropwise addition is completed, the temperature is maintained and the reaction is stirred.
4. Excessive saturated sodium bicarbonate solution was added to the reaction solution, stirred well, accompanied by solid precipitation, and filtered to obtain 2amino-3,5-dibromobenzaldehyde.

The reaction of the invention organically combines the two-step reactions of reduction and bromination, omits the process of obtaining the intermediate product o-aminobenzaldehyde, simplifies the process, and reduces the workload.