Method for separating butane and butene by using multiple mixed solvent
A technology for mixing solvents and separating butane, which is applied in distillation purification/separation, bulk chemical production, organic chemistry, etc. It can solve the problems of low tray efficiency, low solubility, and low separation ability, so as to reduce energy consumption and reduce Solvent ratio, effect of increasing relative volatility
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[0025] The C4 mixture to be treated is C4 after etherification, that is, the mixed C4 after producing MTBE, the solvent ionic liquid used is 1-methyl-3-octyl-imidazole hexafluorophosphate, and the salt is potassium thiocyanate , the ratio of ionic liquid, methyl ethyl ketone and nitrogen-formylmorpholine mixture is 1 / 2 / 2 (mass ratio), and the salt content is 5% (mass).
[0026] The extractive distillation tower (1 tower) used is a packing tower: the material is stainless steel, the tower diameter is 50 mm, and the packing is stainless steel wire mesh packing; the stripping tower (2 towers) is also a packing tower: stainless steel, the tower diameter is 50 mm, and the packing is θ ring packing ;
[0027] Both towers are thermally insulated;
[0028] Mixed carbon four is added from the middle of tower 1 at a temperature of 50°C;
[0029] Solvent / carbon four feed ratio: 6~15;
[0030] Operating pressure at the top of tower 1: 0.50MPa(G);
[0031] 2 tower top operating pressur...
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