A mercury-free catalyst for the synthesis of vinyl chloride by acetylene hydrochlorination
A technology for synthesizing vinyl chloride and mercury catalysts by hydrochlorination of acetylene is applied in the field of catalysis, and can solve the problems of short service life, poor stability and high catalyst cost, and achieve the effects of long service life, good stability and simple preparation method.
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Embodiment 1
[0017] First, weigh 12 parts of cobalt chloride hexahydrate and dissolve in 40g of deionized water, put 100 parts of activated carbon into the cobalt chloride solution and soak for 2 hours; slowly add 10ml of 5mol / L ammonium oxalate solution dropwise, and stir while adding dropwise. After dripping, continue to stir for 0.5 hours; wash, filter, and dry the activated carbon loaded with cobalt oxalate at 110°C; finally, dissolve and immerse 5 parts of manganese chloride into the precursor, and dry at 120°C to obtain the catalyst. The catalyst is used in the process of acetylene hydrochlorination to synthesize vinyl chloride, the acetylene conversion rate is 80%, and the vinyl chloride selectivity is 91%.
Embodiment 2
[0019] The activated carbon loaded with cobalt oxalate was washed, filtered, and dried at 110°C; then thermal cracking was carried out under a nitrogen atmosphere at 550°C for 2 hours, and then dropped to room temperature in a nitrogen atmosphere; 2 0.3% CO in volume fraction 2 , N 2 Passivation in the mixed gas for 2 hours to obtain a precursor; finally, 3 parts of bismuth chloride are dissolved and impregnated into the precursor, and dried at 120°C to obtain a catalyst. The catalyst is used in the process of acetylene hydrochlorination to synthesize vinyl chloride, the acetylene conversion rate is 78%, and the vinyl chloride selectivity is 89%.
Embodiment 3
[0021] First, weigh 5 parts of cobalt chloride hexahydrate and dissolve in 40g of deionized water, put 100 parts of activated carbon into the cobalt chloride solution and soak for 2 hours; slowly add 6ml of 5mol / L ammonium oxalate solution, and stir while dripping. After the dripping, continue to stir for 0.5 hours; finally, 3 parts of bismuth chloride are dissolved and immersed in the precursor, and dried at 120° C. to obtain the catalyst. The catalyst is used in the process of acetylene hydrochlorination to synthesize vinyl chloride, the acetylene conversion rate is 78%, and the vinyl chloride selectivity is 89%.
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