Method for simple detecting the stabilization of solid phosphoric acid catalyst
A phosphoric acid catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical analysis by titration method, etc., can solve the problems of long reaction period, high labor intensity, large investment in equipment and manpower, etc.
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Embodiment 1
[0027] The solid phosphoric acid catalyst A is pulverized so that the particle size of the catalyst is 50-80 mesh, and the composition of the catalyst A is calculated by molar ratio:
[0028] Si 1 B 0.8 (P 2 o 5 ) 1.5 ·(H 2 O) 0.87
[0029] 1. Catalyst A soaking for the first time:
[0030] Weigh 4 grams of the above-mentioned catalyst A in a 250 ml iodine measuring bottle, add 100 ml of detached water, place it in a constant temperature tank at 30°C, and soak for 2 hours to obtain the mixed soaking solution for the first soaking of the catalyst; The whole soaking solution is divided into 2 parts in equal volume, respectively moved into two 250 milliliter volumetric flasks, add 10 drops of 0.1% (weight) thyme phenolphthalein aqueous solution in each part as indicator, and use 0.5000 mol / liter of standard sodium hydroxide Solution titration, titration until the soaking solution is light green is the end point, record the volume of the consumed sodium ...
Embodiment 2
[0042] Stability Evaluation of Catalyst A.
[0043] Catalyst A is loaded into a stainless steel tubular reactor with an inner diameter of 25 mm, with a catalyst loading capacity of 100 ml and fillers up and down. Reaction raw material is made up of 85% (wt) butene-2 and 15% (wt) butane, makes reaction raw material enter reactor and catalyzer contact by metering pump, at reaction temperature 180 ℃, reaction pressure 5.0MPa, liquid volume space velocity 2.0 hours -1 Carry out butene dimerization reaction under the conditions, continuous reaction for 576 hours, the material flowing out of the reactor after the reaction is analyzed by gas chromatography, the reaction time is 2, 24, 72, 144, 216, 288, 360, 432, 504, 576 hours Sampling and analysis (for ease of comparison, the sampling and analysis time is the same as the cumulative immersion time of catalyst A in Example 1), and the conversion of butene was calculated. The evaluation reaction results of Catalyst A are shown in ...
Embodiment 3
[0049] Take the solid phosphoric acid catalyst B and pulverize it so that its particle size is 50-80 mesh. The composition of the solid phosphoric acid catalyst B is calculated in molar ratio:
[0050] Si 1 Fe 0.30 B 0.86 (P 2 o 5 ) 1.50 ·(H 2 O) 0.75
[0051] Soak the catalyst B according to the method of Example 1, filter the soaking solution, titrate, calculate the total phosphoric acid content in the gained soaking solution after soaking the catalyst B for 2, 24, 72, 144, 216, 288, 360, 432, 504, 576 hours .
[0052] The stability evaluation method of catalyst B is the same as in Example 2.
[0053] See Table 3 for the soaking and evaluation reaction results of Catalyst B.
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