Method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether

Abstract

A method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether, wherein the two-phase aqueous system is composed of glycerol block polyether, ammonium sulfate and water, wherein the mass percentage concentration of glycerol block polyether and ammonium sulfate is 2% to 40%, and the mass ratio of ammonium sulfate, glycerol block polyether and water is 1:(0.5 to 3):(3 to 8). The mass ratio of the two-phase aqueous system to the rhenium and molybdenum solution to be separated is 1:(1 to 5). The pH of the mixed solution of the two is adjusted to 1 to 7, and the mixture is stirred and reacted at 20 to 60° C. for 2 to 30 minutes, and then allowed to stand and separated to obtain two aqueous phases rich in rhenium and rich in molybdenum, thereby achieving separation of rhenium and molybdenum; the glycerol block polyether is prepared by ring-opening polymerization of glycerol with ethylene oxide and propylene oxide. The glycerol block polyether has many active groups, and thus the amount used is small. The invention has the ability to treat rhenium and molybdenum ions within a relatively wide concentration range, and has the outstanding advantages of high separation efficiency, mild conditions, safe operation and environmentally friendly process.

Description

Technical Field

[0001] The invention relates to a method for extracting and separating rhenium and molybdenum by using a two-phase aqueous system composed of glycerol block polyether, belonging to the field of separation of metal ions in solutions, and specifically to a method for separating rhenium ions and molybdenum ions in an aqueous solution by using a two-phase aqueous system composed of glycerol block polyether and ammonium sulfate. Background Art

[0002] Rhenium and molybdenum are metals of great economic significance and are widely used in fields such as metallurgy and aerospace. In nature, about 99% of molybdenum exists in the form of molybdenite. In the process of extracting molybdenum from molybdenite, rhenium, copper and other by-products are often produced. In addition, due to the huge difference in abundance and strong isomorphism between molybdenum and rhenium, the separation of molybdenum and rhenium is relatively difficult. At present, the most commonly used method for separating molybdenum and rhenium ions in solution systems is solvent extraction. The organic solvents, phosphine and amine extractants used in the traditional organic solvent extraction process are often volatile and flammable. In addition, the organic solvents are easy to lose, so there are great safety risks and environmental pressures.

[0003] The emergence of nonionic surfactant two-phase aqueous system has brought new opportunities to solve the above problems. This system uses an aqueous solution composed of nonionic surfactants and salts to automatically separate into two aqueous phases at a certain composition and temperature, thereby achieving the distribution of metal ions between different aqueous phases. Muruchi and Jimenez (Journal of Molecular Liquids, 2017, 248: 479-489) used experimental design to study the distribution of perrhenate anions in CuSO4+ PEG 4000+ H2O; the effects of process parameters such as PEG and salt concentrations, temperature and system pH were studied. At 13.7% PEG4000, 13% CuSO4, 35℃ and pH=2, the maximum distribution coefficient of rhenium was 7.72. Zhang et al. (Separation and Purification Technology, 2016, 169: 151-157) studied the distribution of polymolybdates in a two-phase aqueous system based on Triton X-100 and (NH4)2SO4. The results showed that due to the formation of highly hydrophobic polymolybdates, extraction was better under acidic conditions. In addition, CuSO4 and PEG 4000 were studied at different pH values ​​and temperatures, and a maximum extraction rate of 93.07% was obtained at pH = 2.5 and T = 338.15K. Patent CN117051265A discloses a method for separating molybdenum and rhenium in a two-phase aqueous system consisting of isodecanol polyoxyethylene ether, ammonium sulfate and water.

[0004] In summary, the current method of separating rhenium and molybdenum in a two-phase aqueous system has the following disadvantages: the extractant is expensive and the dosage is large; the separation effect on high-concentration rhenium and molybdenum ions is limited; and emulsification phenomenon is easy to occur. Patent CN117051265A discloses the separation of molybdenum and rhenium by isodecanol polyoxyethylene ether as an extractant. Although the ethylene oxide unit in isodecanol polyoxyethylene ether can attach perrhenate ions to the micelle surface and effectively separate rhenium and molybdenum by micelle solubilization, the hydrophilicity of the ethylene oxide group limits the phase separation speed and phase separation ability of the system, and isodecanol polyoxyethylene ether is prone to emulsification and foaming during use, which brings difficulties to the further separation of subsequent metal ions. However, due to the insertion of propylene oxide groups in the ethylene oxide groups, the hydrophobicity of the extractant of glycerol block polyether is greatly improved, which effectively reduces the critical micelle concentration and diffusion coefficient of the system and reduces the dosage of the extractant. And because the number of possible spatial distributions of macromolecules in the solution is small, the larger molecular weight of propylene glycol block polyether means lower mixing entropy, and effectively avoids the foaming phenomenon, resulting in a better phase separation effect. Summary of the invention

[0005] In view of the shortcomings of the current two-phase aqueous system for extracting and separating rhenium and molybdenum, the present invention provides a method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of propylene glycol block polyether, so as to achieve the separation of rhenium and molybdenum ions in an aqueous solution.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether, wherein the two-phase aqueous system consists of glycerol block polyether, ammonium sulfate and water, the mass percentage concentration of glycerol block polyether and ammonium sulfate is 2% to 40%, and the mass ratio of ammonium sulfate, glycerol block polyether and water is 1:(0.5-3):(3-8); the extraction steps are as follows:

[0008] Add 1 part of the two-phase aqueous extraction system to 1-5 parts of the rhenium-molybdenum solution to be separated to obtain a mixed solution; adjust the pH of the mixed solution to 1-7, stir and react at 20-60°C for 2-30 minutes, let stand for 10 minutes to 2 hours, and separate into layers to obtain two aqueous phases rich in rhenium and rich in molybdenum; determine the concentrations of rhenium and molybdenum ions in the two aqueous phases to obtain the separation factor of rhenium / molybdenum. The structural formula of the glycerol block polyether is:

[0009]

[0010] In the structure x1, x2, x3, y1, y 2, y3=5~16, the preparation process of propylene glycol block polyether is as follows:

[0011] 1 part of glycerol and 0.2-0.5 parts of potassium hydroxide as a catalyst are added to a reactor, the reactor is heated to 90-100°C, purged with nitrogen and then evacuated to a pressure of -0.05MPa, 10-30 parts of propylene oxide are added, the initial pressure of the reactor is controlled at 0.20-0.40MPa, and the reaction is carried out. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely; then the reactor is heated to 125-135°C, 10-30 parts of ethylene oxide are added, the initial pressure of the reactor is controlled at 0.25-0.45MPa, and the reaction is carried out. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude glycerol block polyether product.

[0012] A phosphoric acid solution is added to the crude product of the propylene glycol block polyether to adjust the system pH to 7, insoluble impurities are removed by filtration, and then 1 to 2 parts by weight of cyclohexane are added, stirred, and allowed to stand for stratification. The upper layer liquid is vacuum evaporated at 30 to 50° C. to remove the organic solvent to obtain the propylene glycol block polyether. The prepared propylene glycol block polyether has more active groups.

[0013] The preparation of glycerol block polyether can be represented by the following reaction formula:

[0014]

[0015] The mass percentage concentration of rhenium in the rhenium-molybdenum separation solution is 0.001%~5%, and the mass concentration of molybdenum is 0.01%~5%.

[0016] The invention uses glycerol as a starter and synthesizes glycerol block polyether through anionic ring-opening polymerization. The glycerol block polyether and ammonium sulfate form a nonionic surfactant double-phase water system for extracting and separating rhenium and molybdenum ions. The system is characterized in that the synthesized glycerol block polyether contains ethylene oxide units and propylene oxide units, the ethylene oxide group makes the perrhenate ion more easily adsorbed on the surface of the micelle formed by the glycerol block polyether, the propylene oxide group increases the hydrophobicity of the extractant and makes it easier to form micelles, and the salting-out effect of ammonium sulfate destroys the hydrogen bonds formed between the COC group in the glycerol block polyether structure and the water molecules, the strength of the copolymer-water and copolymer-salt interactions is reduced, more water molecules enter the ammonium sulfate-rich water phase (lower phase), the system entropy is reduced, the system Gibbs free energy is increased, and the system phase separation is promoted. Under neutral conditions, rhenium mainly exists in the form of perrhenate anions, and molybdenum mainly exists in the form of molybdate anions. Since the perrhenate anions are more hydrophobic than molybdate, they preferentially migrate to the glycerol-rich block polyether aqueous phase (upper phase), achieving the separation of rhenium and molybdenum in the solution. 2+ 、Zn 2+Since metal cations are highly hydrophilic, this two-phase aqueous system can be used for separation.

[0017] Compared with the prior art, the present invention designs and synthesizes a two-phase system composed of propylene glycol block polyether and ammonium sulfate to extract and separate rhenium and molybdenum ions in the solution, which has the following advantages: the propylene glycol block polyether described in the present invention is a branched polyether. Compared with general linear polyethers, the multi-branched block polyether has a stronger binding force to metal ions, and the micelles formed are also relatively compact; the propylene glycol block polyether increases the specific surface area of ​​the polyether and reduces the emulsification performance by inserting propylene oxide groups, thereby solving the problem of easy formation of foam in the two-phase extraction process and difficulty in separating metal ions from the polyether-rich phase; the propylene glycol block polyether has many active groups, so the dosage is small. The present invention has the ability to process rhenium and molybdenum ions in a wide concentration range, and has the outstanding advantages of high separation efficiency, mild conditions, safe operation and environmentally friendly process. The rhenium extraction rate reaches 90~98%, and the rhenium / molybdenum separation factor reaches 188.58~1492.6. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the invention clearer, the present invention is further described in detail below in conjunction with specific examples. The specific examples described here are used to explain the present invention, but not to limit the present invention, and the parts mentioned are all parts by mass.

[0019] Example 1

[0020] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0021] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude product of the propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1 part of cyclohexane was added, stirred, and allowed to stand for stratification. The upper layer liquid was evaporated in vacuo at 40° C. to remove the organic solvent, thereby obtaining the propylene glycol block polyether.

[0022] The two-phase aqueous extraction system is composed of 20% by mass percentage of glycerol block polyether and ammonium sulfate, and the rest is water. The target solution is composed of 0.03% rhenium and 0.8% molybdenum by mass percentage. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 1, shaken at 30℃ for 30min, and allowed to stand at 30℃ for 10min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 90.2%, and the rhenium / molybdenum separation factor is 188.58.

[0023] Example 2

[0024] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0025] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1.5 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was vacuum evaporated at 40° C. to remove the organic solvent, and the propylene glycol block polyether product was obtained.

[0026] The two-phase aqueous extraction system is composed of 20% by mass percentage of glycerol block polyether and ammonium sulfate, and the rest is water. The target solution is composed of 0.03% rhenium and 0.8% molybdenum by mass percentage. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 3, shaken at 30℃ for 30min, and allowed to stand at 30℃ for 15min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 95.5%, and the rhenium / molybdenum separation factor is 322.61.

[0027] Example 3

[0028] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0029] Then, a 50% by mass phosphoric acid solution was added to the crude propylene glycol block polyether product to adjust the system pH to 7, and the insoluble impurities were removed by filtration. Then, 2 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was evaporated at 40° C. under vacuum to remove the organic solvent, thereby obtaining the propylene glycol block polyether product.

[0030] The two-phase aqueous extraction system is composed of 20% by mass percentage of glycerol block polyether and ammonium sulfate, and the rest is water. The target solution is composed of 0.03% rhenium and 0.8% molybdenum by mass percentage. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 7, shaken at 30℃ for 30min, and allowed to stand at 30℃ for 20min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 95.6%, and the rhenium / molybdenum separation factor is 363.45.

[0031] Example 4

[0032] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0033] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1.5 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was vacuum evaporated at 40° C. to remove the organic solvent, and the propylene glycol block polyether product was obtained.

[0034] The two-phase aqueous extraction system is composed of 20% by mass percentage of glycerol block polyether and ammonium sulfate, and the rest is water. The target solution is composed of 0.03% rhenium and 0.8% molybdenum by mass percentage. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 7, shaken at 30℃ for 30min, and allowed to stand at 30℃ for 40min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 95.7%, and the rhenium / molybdenum separation factor is 372.64.

[0035] Example 5

[0036] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0037] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1.5 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was vacuum evaporated at 40° C. to remove the organic solvent, and the propylene glycol block polyether product was obtained.

[0038] The two-phase aqueous extraction system consists of 20% propylene glycol block polyether and 24% ammonium sulfate, and the rest is water. The target solution consists of 0.1% rhenium and 0.5% molybdenum. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 5, shaken at 30℃ for 20min, and allowed to stand at 30℃ for 40min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 96.4%, and the rhenium / molybdenum separation factor is 548.7.

[0039] Example 6

[0040] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0041] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1.5 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was vacuum evaporated at 40° C. to remove the organic solvent, and the propylene glycol block polyether product was obtained.

[0042] The two-phase aqueous extraction system consists of 10% propylene glycol block polyether and 20% ammonium sulfate, and the rest is water. The target solution consists of 0.03% rhenium and 0.8% molybdenum. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 7, shaken at 30℃ for 20min, and allowed to stand at 30℃ for 40min, and the two-phase solution is obtained by stratification. Two aqueous phases rich in rhenium and rich in molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 92.5%, and the rhenium / molybdenum separation factor is 215.43.

[0043] Example 7

[0044] Add 1 part of propylene glycol and 0.4 parts of catalyst potassium hydroxide into the reactor, heat the reactor to 90°C, purge with nitrogen and then pump down to a pressure of about -0.05MPa. Add 20 parts of propylene oxide, control the initial pressure of the reactor to 0.20~0.40MPa, and react. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely. Then heat the reactor to 130°C, add 20 parts of ethylene oxide, control the initial pressure of the reactor to 0.25~0.45MPa, and react. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude propylene glycol block polyether product.

[0045] Then, a phosphoric acid solution with a mass percentage concentration of 50% was added to the crude propylene glycol block polyether to adjust the system pH to 7, and the insoluble impurities were filtered out. Then, 1.5 parts of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was vacuum evaporated at 40° C. to remove the organic solvent, and the propylene glycol block polyether product was obtained.

[0046] The two-phase aqueous extraction system consists of 40% propylene glycol block polyether and 20% ammonium sulfate, and the rest is water. The target solution consists of 0.03% rhenium and 0.3% molybdenum. The two-phase aqueous extraction system and the target solution are mixed in a volume ratio of 1:1, the solution pH is adjusted to 7, shaken at 30℃ for 20min, and allowed to stand at 30℃ for 40min, and two aqueous phases rich in rhenium and molybdenum are obtained by stratification. The two aqueous phases are diluted separately, and the concentrations of molybdenum and rhenium in the two phases are determined. The rhenium extraction rate is calculated to be 98.8%, and the rhenium / molybdenum separation factor is 1492.6.

[0047] The above descriptions are only some embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether, characterized in that: The two-phase aqueous system is composed of glycerol block polyether, ammonium sulfate and water, the mass percentage concentration of glycerol block polyether and ammonium sulfate is 2% to 40%, and the mass ratio of ammonium sulfate, glycerol block polyether and water is 1:(0.5 to 3):(3 to 8); the extraction steps are as follows: Add 1 part of the aqueous two-phase extraction system to 1-5 parts of the rhenium-molybdenum solution to be separated to obtain a mixed solution; adjust the pH of the mixed solution to 1-7, stir and react at 20-60° C. for 2-30 minutes, let stand for 10 minutes to 2 hours, and separate into two aqueous phases, rich in rhenium and rich in molybdenum; determine the concentrations of rhenium and molybdenum ions in the two aqueous phases to obtain a rhenium / molybdenum separation factor; the structural formula of the glycerol block polyether is: ； In the structure x1, x2, x3, y1, y 2, y3=5~16; The preparation process of the glycerol block polyether is as follows: 1 part of glycerol and 0.2-0.5 parts of potassium hydroxide as a catalyst are added to a reactor, the reactor is heated to 90-100°C, purged with nitrogen and then evacuated to a pressure of -0.05MPa, 10-30 parts of propylene oxide are added, the initial pressure of the reactor is controlled at 0.20-0.40MPa, and the reaction is carried out. When the pressure of the reactor drops to -0.05MPa, the propylene oxide reacts completely; the reactor is heated to 125-135°C, 10-30 parts of ethylene oxide are added, the initial pressure of the reactor is controlled at 0.25-0.45MPa, and the reaction is carried out. When the pressure of the reactor drops to -0.05MPa, the ethylene oxide reacts completely to obtain a crude glycerol block polyether; A phosphoric acid solution was added to the crude product of the propylene glycol block polyether to adjust the system pH to 7, and insoluble impurities were removed by filtration. Then, 1 to 2 parts by weight of cyclohexane were added, stirred, and allowed to stand for stratification. The upper layer liquid was evaporated at 30 to 50° C. in vacuum to remove the organic solvent, thereby obtaining the propylene glycol block polyether.

2. The method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether as claimed in claim 1, characterized in that: In the two-phase aqueous system, the mass ratio of ammonium sulfate, glycerol block polyether and water is 1:(0.5-2):(3-7).

3. The method for extracting and separating rhenium and molybdenum using a two-phase aqueous system composed of glycerol block polyether as claimed in claim 2, characterized in that: The mass ratio of the ammonium sulfate, glycerol block polyether and water is 1:(0.5-2):(3-6).

4. The method for extracting and separating rhenium and molybdenum by a two-phase aqueous system composed of glycerol block polyether according to claim 1, characterized in that: The mass percentage concentration of rhenium in the rhenium-molybdenum solution to be separated is 0.001%-5%, and the mass percentage concentration of molybdenum is 0.01%-5%.

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