Method for salt extraction separation of benzol-cyclohexane normal heptane
A technology of cyclohexane and n-heptane, applied in extraction purification/separation, distillation purification/separation, etc., can solve problems such as difficult stratification and inability to achieve, and achieve simple operation, good economy and industrial feasibility, technical mature effect
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Embodiment 1
[0016] Embodiment one: single-stage extraction separation of benzene and cyclohexane azeotrope
[0017] Add a certain amount of N,N-dimethylformamide into the beaker, and add the dried potassium thiocyanate while stirring with an electric stirrer, so that the amount of potassium thiocyanate added accounts for 25% of the total mass of the two ; In the conical flask, add 22.5ml hexanaphthene, 22.5ml benzene (the azeotropic composition benzene molar content 55%) and 45ml composite extraction agent, adopt constant temperature magnetic stirrer to fully mix and stir one hour at normal temperature; , weighing, obtain raffinate 30ml, extract 60ml; Analyze solution composition with gas chromatography, the mol ratio of cyclohexane and benzene in the raffinate is: 1.77: 1.00; The molar ratio of cyclohexane and benzene in the extract is 0.21 : 1.00. The distribution coefficient of cyclohexane is 9.4, the distribution coefficient of benzene is 1.12 and the selectivity coefficient reaches ...
Embodiment 2
[0020] Embodiment 2: Multistage cross-flow extraction of benzene-cyclohexane-n-heptane mixture
[0021] Add a certain amount of N,N-dimethylformamide in a beaker, add the dried potassium thiocyanate while stirring with an electric stirrer, the amount of potassium thiocyanate added accounts for 15% of the total mass; In the liquid funnel, add 10ml cyclohexane, 10ml n-heptane, 20ml benzene and 40ml compound extractant, oscillate and mix evenly; let the layers stand, take the extract in a beaker, and add new compound extractant according to the volume flow ratio of 1:1. Extractant is mixed in raffinate, repeats above-mentioned steps, carries out five-stage cross-flow extraction, utilizes gas chromatography analysis solution to form, and the molar content of benzene in the raffinate phase is 0.63%, and the molar content of benzene in the extract phase is 85.7% (desolvation content ).
[0022] It can be seen that the separation of benzene-cyclohexane-n-heptane mixture by using N,N...
Embodiment 3
[0023] Embodiment three: Multistage countercurrent extraction of benzene and cyclohexane azeotrope
[0024] The five-stage countercurrent extraction process was simulated by using three separating funnels. Get three separatory funnel numbers, add 20ml cyclohexane, 20ml benzene (azeotropic composition benzene molar content 55%) and 40ml composite extractant in No. Take out the extract and put it into the No. 2 separatory funnel, and add fresh material liquid and compound solvent into the No. 1 and No. 2 separatory funnels according to the volume flow ratio, shake them up separately, and let them stand for stratification; put the lower layer of the No. 3 separatory funnel The extract is discharged, the extract from the lower layer of the No. 2 separatory funnel is placed in the No. 3 separatory funnel, the lower layer extract of the No. 1 separatory funnel is placed in the No. 2 separatory funnel, and the raffinate phase from the upper layer of the No. 1 separatory funnel is dis...
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