Method for fixed bed alkylation separation of m-cresol and p-cresol
A technology of fixed bed and p-cresol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as increased production costs, strong corrosion, difficult separation of products, etc., to reduce consumption and load , to suppress the effect of generating
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Embodiment 1
[0016] Add 1 unit volume of silica gel-loaded 1-(3-sulfonic acid)-3-methylimidazolium bisulfate into a tubular fixed-bed reactor, raise the temperature of the reactor to 40°C, and feed 20% mass of butylphenol mixed m-p-methylphenol raw material, the space velocity is 0.1h -1 , while feeding isobutene, mixing m-p-methylphenol raw material: isobutene (n:n)=1:0.2, and carrying out alkylation reaction to obtain a reaction mixture. The resulting reaction mixture is subjected to conventional rectification to obtain mixed m-p-cresol, 4-methyl-2-tert-butylphenol, 3-methyl-4-tert-butylphenol and high-boiling methyldi-tert-butylphenol , The results of chromatographic analysis show that the mixed m-p-methylphenol is 65.7%, 4-methyl-2-tert-butylphenol 4.8%, 3-methyl-4-tert-butylphenol 10.4% and high boiling point methyl di Tert-butylphenol 19.1%.
Embodiment 2
[0018] Add 1 unit volume of silica gel-loaded 1-(3-sulfonic acid)-3-methylimidazolium bisulfate into the tubular fixed-bed reactor, increase the temperature of the reactor to 60°C, and feed 20% mass of butylphenol mixed m-p-methylphenol raw material, the space velocity is 0.3h -1 , while feeding isobutene, mixing m-p-methylphenol raw material: isobutene (n:n)=1:0.2, and carrying out alkylation reaction to obtain a reaction mixture. The resulting reaction mixture is subjected to conventional rectification to obtain mixed m-p-cresol, 4-methyl-2-tert-butylphenol, 3-methyl-4-tert-butylphenol and high-boiling methyldi-tert-butylphenol , The results of chromatographic analysis show that the mixed m-p-methylphenol is 56.9%, 4-methyl-2-tert-butylphenol 8.0%, 3-methyl-4-tert-butylphenol 16.6% and high boiling point methyl di tert-butylphenol 19.5%.
Embodiment 3
[0020] Add 1 unit volume of silica gel-loaded 1-(3-sulfonic acid)-3-methylimidazolium bisulfate into a tubular fixed-bed reactor, increase the temperature of the reactor to 80°C, and feed 20% mass of butylphenol mixed m-p-methylphenol raw material, the space velocity is 0.6h -1 , while feeding isobutene, mixing m-p-methylphenol raw material: isobutene (n:n)=1:0.2, and carrying out alkylation reaction to obtain a reaction mixture. The resulting reaction mixture is subjected to conventional rectification to obtain mixed m-p-cresol, 4-methyl-2-tert-butylphenol, 3-methyl-4-tert-butylphenol and high-boiling methyldi-tert-butylphenol , The results of chromatographic analysis show that the mixed m-p-methylphenol is 56.6%, 4-methyl-2-tert-butylphenol 8.1%, 3-methyl-4-tert-butylphenol 16.4% and high boiling point methyl di tert-butylphenol 18.9%.
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