Polymer/amphoterics/aqueous two-phase system, preparation method and application thereof
A surfactant, two-phase system technology, applied in separation methods, chemical instruments and methods, solvent extraction, etc., can solve problems such as high viscosity and unfavorable operation, and achieve good phase-forming effect, stable phase behavior, and phase-forming. fast effect
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Embodiment 1
[0017] Add a certain amount of known concentration of polyethylene glycol (polyethylene glycol molecular weight is 20000, i.e. PEG20000) and cocamidopropyl betaine (Cocamidopropyl Betaine) in a 10ml glass centrifuge tube, add water to make the total weight of the system approx. 10g, turn it upside down and mix well, put it in a temperature-controlled centrifuge (25°C, 3000rpm, 30min), and put the centrifuged system in a 25°C constant temperature water bath for 24 hours to ensure the balance of the system and form Polyethylene glycol / cocamidopropyl betaine / water two-phase system, then take it out, record the volume of the two phases, and take out the upper and lower phases respectively.
[0018] Use an elemental analyzer (vario EL) to analyze the mass fractions of C, H, and N elements in the two-phase aqueous system: use the elemental composition of betaine molecules and polyethylene glycol molecules in the system to calculate the composition of the two phases , the results are...
Embodiment 2
[0023] The two-phase phase equilibrium result of macrogol 10000 / cocamidopropyl betaine / water system, experimental procedure is exactly the same as embodiment 1, and the results are shown in Table 2 and figure 2 . The data in the figure and the table are all mass percentages.
[0024] Table 2 Phase equilibrium data of polyethylene glycol 10000 / cocamidopropyl betaine / water system, 25℃
[0025]
Embodiment 3
[0027] The two-phase phase equilibrium result of macrogol 2000 / cocamidopropyl betaine / water system, experimental procedure is exactly the same as embodiment 1, and the results are shown in Table 3 and image 3 . The data in the figure and the table are all mass percentages.
[0028] Table 3 Phase equilibrium data of polyethylene glycol 2000 / cocamidopropyl betaine / water system, 25℃
[0029]
[0030]
[0031] The phase diagram of the polyethylene glycol / cocamidopropyl betaine / water system of the present invention can be divided into a single-phase region, a two-phase region and a liquid-solid phase region. When the molecular weight of polyethylene glycol is greater than 10,000, the mutual solubility of the two phase-forming substances is small, and the connecting line is symmetrical, which is similar to the usual high polymer-high polymer type aqueous two-phase system.
[0032] In the polyethylene glycol / cocamidopropyl betaine / water two-phase aqueous system in the above-...
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