Preparation method of low-mercury compound catalyst for producing vinyl chloride
A composite catalyst, vinyl chloride technology, applied in catalyst activation/preparation, chemical instruments and methods, hydrogen halide addition preparation, etc., can solve the problems of low mercury catalyst activity, stability and selectivity reduction, etc., to improve metal dispersion degree and active sites, improving activity and stability, reducing utilization and emissions
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Embodiment 1
[0027] The first step, pretreatment of coal-based carbon carrier
[0028]At room temperature, soak 100g of coal-based carbon in 300mL of aqua regia and stir for 1 hour, then filter it with suction and wash the filter cake with deionized water until the pH value of the filtrate is 5, then bake the filter cake at 120°C Drying, the resulting dried filter cake was added to 300mL of 10% triethylamine aqueous solution at 120°C while refluxing and stirring for 3 hours, then it was suction filtered and the filter cake was dried at 120°C, Prepare the pretreated coal-based carbon carrier;
[0029] The second step is to prepare low-mercury composite catalyst
[0030] 2.1 Addition of surfactant cetyltrimethylammonium chloride
[0031] Weigh 2.85g cetyltrimethylammonium chloride and 4g HgCl respectively 2 , under the state of stirring in an ultrasonic water bath with a power of 80W at 50°C, add 2.85g of cetyltrimethylammonium chloride to 214g of deionized water, and then add 4g of HgCl ...
Embodiment 2
[0036] In addition to adopting an ultrasonic water bath with a power of 99W and cetyltrimethylammonium chloride by mass ratio: HgCl 2 =7.65:4 Weigh cetyltrimethylammonium chloride and HgCl respectively 2 Except, other is with embodiment 1, makes low mercury composite catalyst, in this low mercury composite catalyst, HgCl 2 The percentage of the total mass of the catalyst is 4%, NiCl 2 The percentage accounting for the overall mass of the catalyst is 4%, the percentage of cetyltrimethylammonium chloride accounting for the overall mass of the catalyst is 7.65%, and the rest is C. At 130°C and acetylene space velocity 80h -1 Under the evaluation conditions, the low-mercury composite catalyst prepared in this example has an acetylene conversion rate of 99.4% and a vinyl chloride selectivity of 99% in the acetylene hydrochlorination reaction.
Embodiment 3
[0038] The first step, pretreatment of coal-based carbon carrier
[0039] At room temperature, soak 100g of coal-based carbon in 300mL of aqua regia and stir for 1 hour, then filter it with suction and wash the filter cake with deionized water until the pH value of the filtrate is 6, then bake the filter cake at 120°C Drying, the resulting dried filter cake was added to 300mL of 10% triethylamine aqueous solution at 120°C and stirred for 3 hours at 120°C, then suction filtered and the filter cake was dried at 120°C to prepare Obtain the pretreated coal-based carbon carrier;
[0040] The second step is to prepare low-mercury composite catalyst
[0041] 2.1 Addition of surfactant cetyltrimethylammonium chloride
[0042] Weigh 5.25g cetyltrimethylammonium chloride and 5.25g HgCl respectively 2 , at 50°C with 90W ultrasonic water bath stirring, add 5.25g of cetyltrimethylammonium chloride to 205g of deionized water, then add 5.25g of HgCl 2 And after stirring for 30 minutes, t...
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