Titanium dioxide supported dmc catalyst, its preparation method and application

Abstract

The application belongs to the technical field of catalysts, and particularly relates to a titanium dioxide supported DMC catalyst and a preparation method and application thereof. The preparation method of the titanium dioxide supported DMC catalyst comprises the following steps: S1, dissolving zinc chloride, heat preservation stirring, and obtaining a solution A; adding titanium ethoxide and a dilute hydrochloric acid solution into the solution A, and stirring to obtain a solution B; S2, adding a divalent metal potassium cyanide solution into the solution B, refluxing, and obtaining a solution C; dispersing the solution C in a mixed solution, stirring, centrifuging, washing, and vacuum drying, and thus the titanium dioxide supported DMC catalyst is obtained. The titanium dioxide supported DMC catalyst prepared by the application has excellent catalytic activity, and can efficiently catalyze the preparation of anisonol-based nonionic surfactant.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of catalysts, and particularly relates to a titanium dioxide supported DMC catalyst and a preparation method and application thereof. BACKGROUND

[0002] Fatty alcohol polyoxyethylene ether is non-toxic, odorless and biodegradable, and is an important non-ionic surfactant. Fatty alcohol polyoxyethylene ether can produce a series of products with different properties due to different addition numbers of ethylene oxide / propylene oxide, thereby having excellent penetration, emulsification and washing performance and becoming a main active substance in the daily chemical industry. Fatty alcohol polyoxyethylene ether is widely used in synthetic detergents and liquid detergents.

[0003] Among fatty alcohol polyoxyethylene ethers, isomeric alcohol polyoxyethylene ether is widely used in the textile industry, leather, daily chemical washing and the like, and is a high-efficiency dispersant, wetting agent and emulsifier. At present, it mainly includes isomeric decanol polyoxyethylene ether, isomeric undecanol polyoxyethylene ether, isomeric tridecanol polyoxyethylene ether and the like, but lacks isononyl alcohol-based non-ionic surfactants. Therefore, it is urgent to develop a catalyst capable of efficiently catalyzing the preparation of isononyl alcohol-based non-ionic surfactants. SUMMARY

[0004] The application aims to provide a titanium dioxide supported DMC catalyst and a preparation method and application thereof. The prepared DMC catalyst has excellent catalytic activity and can efficiently catalyze the preparation of isononyl alcohol-based non-ionic surfactants.

[0005] In order to achieve the above-mentioned purpose, the following technical scheme is adopted in the application: a preparation method of a titanium dioxide supported DMC catalyst, comprising the following steps:

[0006] S1, dissolving zinc chloride, heat preservation and stirring to obtain solution A; adding titanium ethoxide and dilute hydrochloric acid solution to solution A, stirring to obtain solution B;

[0007] S2, adding divalent metal potassium cyanide solution to solution B, refluxing to obtain solution C; dispersing solution C in a mixed solution, stirring, centrifuging, washing and vacuum drying to obtain the titanium dioxide supported DMC catalyst.

[0008] Preferably, the solvent for dissolving zinc chloride in step S1 is a mixed solution of water and tert-butanol, and the volume ratio of water to tert-butanol is (0.1-10):1.

[0009] Preferably, the mass ratio of zinc chloride to solvent in step S1 is 1:(8-20).

[0010] Preferably, the temperature for heat preservation and stirring in step S1 is 10-100℃, and the stirring time is 0.1-10h.

[0011] Preferably, the mass ratio of titanium ethoxide to zinc chloride in step S1 is (0.1-10):1.

[0012] Preferably, the concentration of the dilute hydrochloric acid solution in step S1 is 0.001-0.5M.

[0013] Preferably, the amount of the dilute hydrochloric acid solution in step S1 is 0.01-20mL.

[0014] Preferably, the stirring time in step S1 is 0.1-10h.

[0015] Preferably, the divalent metal potassium cyanide solution in step S2 is selected from at least one of potassium ferrocyanide solution, potassium cobalt cyanide solution, and potassium nickel cyanide solution.

[0016] Preferably, the amount of the divalent metal potassium cyanide solution in step S2 is 1-100mL, and the concentration of the divalent metal potassium cyanide solution is 0.01-0.5g / mL.

[0017] Preferably, the reflux temperature in step S2 is 50-200℃, and the reflux time is 0.1-30h.

[0018] Preferably, the mixed solution in step S2 is a mixed solution of water and tert-butyl alcohol, wherein the volume ratio of water to tert-butyl alcohol is (1-10):1.

[0019] Preferably, the stirring temperature in step S2 is 10-100℃, and the stirring time is 1-10h.

[0020] Preferably, the washing solvent in step S2 is tert-butyl alcohol.

[0021] Preferably, the vacuum drying temperature in step S2 is 30-100℃.

[0022] The present application also claims a titanium dioxide supported DMC catalyst prepared by the method for preparing the titanium dioxide supported DMC catalyst.

[0023] The present application also claims the use of the titanium dioxide supported DMC catalyst in the preparation of isononyl alcohol based nonionic surfactants. The isononyl alcohol based nonionic surfactants include but are not limited to EO-5 isononyl alcohol based nonionic surfactants, EO-7 isononyl alcohol based nonionic surfactants, EO-9 isononyl alcohol based nonionic surfactants, and EO-13 isononyl alcohol based nonionic surfactants.

[0024] The present application also claims a method for preparing isononyl alcohol based nonionic surfactants using the titanium dioxide supported DMC catalyst, comprising the following steps:

[0025] a, take the isononyl alcohol, put into the reaction kettle, stirring, adding the titanium dioxide loaded DMC catalyst, stirring, the reaction kettle is replaced by gas for many times, heating, and under the condition of stirring, dehydration treatment under reduced pressure;

[0026] b, under the condition of negative pressure, continue to heat the reaction kettle, then pass into the reaction kettle, and control the temperature and pressure in the kettle, after the end of the ethylene oxide feeding, the pressure in the reaction kettle is reduced to negative pressure and remains unchanged, the reaction kettle is cooled, and the unreacted ethylene oxide is extracted, to obtain the isononyl alcohol based nonionic surfactant.

[0027] Preferably, the amount of isononyl alcohol used in step a is 10-500 mL.

[0028] The isononyl alcohol used in the present application can be selected from the self-produced product of Sinopec Maoming Petrochemical Company.

[0029] Preferably, the amount of titanium dioxide loaded DMC catalyst used in step a is 0.01-50 g.

[0030] Preferably, the stirring rate in step a is 50-500 rpm, and the stirring time is 5-60 min.

[0031] Preferably, the gas used for gas replacement in step a is N2 or Ar.

[0032] Preferably, the temperature in step a is raised to 50-90℃.

[0033] Preferably, the dehydration treatment under reduced pressure in step a is 0.5-3 h.

[0034] Preferably, the temperature in step b is raised to 80-200℃.

[0035] Preferably, the amount of ethylene oxide passed in step b is 10-500 mL.

[0036] Preferably, the temperature and pressure in the kettle in step b are controlled to be 80-200℃ and 0.1-0.9 MPa, respectively.

[0037] Preferably, the temperature in step b is reduced to 50-90℃.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] (1) The present application provides a titanium dioxide loaded DMC catalyst, which uses titanium dioxide flakes as a substrate, can effectively improve the dispersibility of the DMC catalyst loaded on the surface, thereby increasing the contact area between the catalyst and the reactants, and ultimately improving the catalytic activity.

[0040] (2) The prepared titanium dioxide loaded DMC catalyst is applied to the synthesis process of isononyl alcohol based nonionic surfactant, and different EO number isononyl alcohol based nonionic surfactants are successfully prepared, which opens up a new way for improving the comprehensive optimization and deep utilization of Maoming petrochemical product resources, and promotes the fine and diversification development of products to downstream products. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the examples and comparative examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0043] Example 1

[0044] S1: 7g of zinc chloride was dissolved in a mixture of 30mL of ultrapure water and 30mL of tert-butyl alcohol, and was stirred at 50℃ to obtain solution A; 0.7g of titanium ethoxide and 0.001M dilute hydrochloric acid 0.05mL were added to solution A, and stirred for 3h to obtain solution B;

[0045] S2: Potassium ferrocyanide solution (1.5g of potassium ferrocyanide was dissolved in 30mL of ultrapure water) was added to solution B, and solution C was obtained by refluxing at 120℃ for 20h; solution C was dispersed in a mixture of 20mL of tert-butyl alcohol and 20mL of water, and was stirred at 50℃, and after centrifugation, tert-butyl alcohol washing and vacuum drying at 50℃, the titanium dioxide loaded DMC catalyst was obtained.

[0046] Example 2

[0047] S1: 3g of zinc chloride was dissolved in a mixture of 50mL of ultrapure water and 10mL of tert-butyl alcohol, and was stirred at 30℃ to obtain solution A; 1.5g of titanium ethoxide and 0.005M dilute hydrochloric acid 0.1mL were added to solution A, and stirred for 5h to obtain solution B;

[0048] S2: Add a potassium nickel cyanide solution (1 g of potassium nickel cyanide is dissolved in 10 mL of ultrapure water) to solution B, and obtain solution C through a reflux process, wherein the reflux temperature is 140°C, and the time is 10 h; disperse solution C in a mixed solution of 10 mL of tert-butyl alcohol and 40 mL of water, stir at 30°C, and obtain the titanium dioxide loaded DMC catalyst after centrifugation, tert-butyl alcohol washing, and vacuum drying, wherein the vacuum drying temperature is 30°C.

[0049] Example 3

[0050] S1: Dissolve 10 g of zinc chloride in a mixed solution of 150 mL of ultrapure water and 50 mL of tert-butyl alcohol, and stir at 50°C to obtain solution A; add 10 g of titanium ethoxide and 0.3 mL of 0.01M dilute hydrochloric acid to solution A, and stir for 5 h to obtain solution B;

[0051] S2: Add a potassium cobalt cyanide solution (4 g of potassium cobalt cyanide is dissolved in 50 mL of ultrapure water) to solution B, and obtain solution C through a reflux process, wherein the reflux temperature is 160°C, and the time is 5 h; disperse solution C in a mixed solution of 20 mL of tert-butyl alcohol and 60 mL of water, stir at 50°C, and obtain the titanium dioxide loaded DMC catalyst after centrifugation, tert-butyl alcohol washing, and vacuum drying, wherein the vacuum drying temperature is 50°C.

[0052] Example 4

[0053] S1: Dissolve 3 g of zinc chloride in a mixed solution of 50 mL of ultrapure water and 10 mL of tert-butyl alcohol, and stir at 30°C to obtain solution A; add 1.5 g of titanium ethoxide and 0.1 mL of 0.005M dilute hydrochloric acid to solution A, and stir for 5 h to obtain solution B;

[0054] S2: Add a potassium nickel cyanide solution (0.5 g of potassium nickel cyanide is dissolved in 20 mL of ultrapure water) to solution B, and obtain solution C through a reflux process, wherein the reflux temperature is 140°C, and the time is 10 h; disperse solution C in a mixed solution of 10 mL of tert-butyl alcohol and 40 mL of water, stir at 30°C, and obtain the titanium dioxide loaded DMC catalyst after centrifugation, tert-butyl alcohol washing, and vacuum drying, wherein the vacuum drying temperature is 30°C.

[0055] Example 5

[0056] S1: Dissolve 5 g of zinc chloride in a mixed solution of 50 mL of ultrapure water and 10 mL of tert-butyl alcohol, and stir at 30°C to obtain solution A; add 10 g of titanium ethoxide and 0.1 mL of 0.005M dilute hydrochloric acid to solution A, and stir for 5 h to obtain solution B;

[0057] S2: potassium nickel cyanide solution (1 g of potassium nickel cyanide is dissolved in 10 mL of ultrapure water) is added to solution B, and solution C is obtained by refluxing, wherein the reflux temperature is 140°C and the time is 10 h; solution C is dispersed in a mixed solution of 10 mL of tert-butyl alcohol and 40 mL of water, stirred at 30°C, and after centrifugation, tert-butyl alcohol washing, and vacuum drying at 30°C, the titanium dioxide loaded DMC catalyst is obtained.

[0058] Example 6

[0059] S1: 3 g of zinc chloride is dissolved in a mixture of 50 mL of ultrapure water and 10 mL of tert-butyl alcohol, and stirred at 30°C to obtain solution A; 1.5 g of titanium ethoxide and 1 mL of 0.1M dilute hydrochloric acid are added to solution A, and stirred for 5 h to obtain solution B;

[0060] S2: potassium nickel cyanide solution (1 g of potassium nickel cyanide is dissolved in 10 mL of ultrapure water) is added to solution B, and solution C is obtained by refluxing, wherein the reflux temperature is 140°C and the time is 10 h; solution C is dispersed in a mixed solution of 10 mL of tert-butyl alcohol and 40 mL of water, stirred at 30°C, and after centrifugation, tert-butyl alcohol washing, and vacuum drying at 30°C, the titanium dioxide loaded DMC catalyst is obtained.

[0061] Example 7

[0062] a. 100 mL of isononyl alcohol is placed in a high-temperature high-pressure reaction kettle and stirred for 30 min at a stirring rate of 200 rpm; 1 g of the titanium dioxide loaded DMC catalyst prepared in Example 1 is added to the high-temperature high-pressure reaction kettle and stirred for 30 min at a stirring rate of 200 rpm; the high-temperature high-pressure reaction kettle is subjected to gas replacement with N2 for at least 3 times, and then is heated to 60°C, and is subjected to a dehydrating treatment under reduced pressure for 2 h under stirring at a stirring rate of 200 rpm;

[0063] b. Under negative pressure, the high-temperature high-pressure reaction kettle is continuously slowly heated to 175°C, and 270 mL of ethylene oxide is slowly introduced into the kettle, and the temperature in the kettle is controlled at 175°C and the pressure is controlled at 0.4 MPa; after the introduction of ethylene oxide is completed, the feeding valve is closed, the pressure in the reaction kettle is maintained at negative pressure, and the reaction kettle is slowly cooled to 75°C, and then the unreacted ethylene oxide is extracted, and the isononyl alcohol based nonionic surfactant is obtained.

[0064] It is detected and analyzed that the actual polymerization degree of the isononyl alcohol based nonionic surfactant prepared by the titanium dioxide loaded DMC catalyst prepared in Example 1 is 7.2, which is within a reasonable error range of the theoretical polymerization degree 7, and the yield is 90.1%.

[0065] It is shown that the titanium dioxide supported DMC of the application successfully catalyzes the preparation of EO-7 isononyl alcohol based nonionic surfactant.

[0066] Example 8

[0067] a, take 100 mL of isononyl alcohol, put it into a high temperature and high pressure reaction kettle and stir for 30 min, the stirring rate is 200 rpm; take 6 g of the titanium dioxide supported DMC catalyst prepared in Example 1, add it into the high temperature and high pressure reaction kettle, and stir for 30 min, the stirring rate is 200 rpm; the high temperature and high pressure reaction kettle is subjected to gas replacement with N2 for multiple times, then it is heated, heated to 75℃, and subjected to a dehydration treatment under stirring for 3 h, the stirring rate is 200 rpm;

[0068] b, under negative pressure, continue to slowly heat the high temperature and high pressure reaction kettle to 190℃, slowly feed 330 mL of ethylene oxide into it, and control the temperature in the kettle to be 190℃ and the pressure to be 0.6 MPa; after the feeding of ethylene oxide is completed, close the feeding valve, maintain the pressure in the reaction kettle to be negative pressure, slowly cool the reaction kettle to 75℃, and after the unreacted ethylene oxide is extracted, the isononyl alcohol based nonionic surfactant is obtained.

[0069] It is detected and analyzed that the isononyl alcohol based nonionic surfactant prepared by the DMC catalyst prepared in Example 1 has an actual polymerization degree of 9.1, which is within a reasonable error range of the theoretical polymerization degree 9, and the yield is 89.5%.

[0070] It is shown that the titanium dioxide supported DMC of the application successfully catalyzes the preparation of EO-9 isononyl alcohol based nonionic surfactant.

[0071] Comparative Example 1

[0072] S1: 7 g of zinc chloride is dissolved in a mixture of 30 mL of ultrapure water and 30 mL of tert-butyl alcohol, and stirred at 50℃ to obtain solution A;

[0073] S2: the potassium ferrocyanide solution (1.5 g of potassium ferrocyanide is dissolved in 30 mL of ultrapure water) is added to solution A, and solution B is obtained by refluxing at a reflux temperature of 120℃ for 20 h;

[0074] S3: solution B is dispersed in a mixture of 20 mL of tert-butyl alcohol and 20 mL of water, and stirred at 50℃. After centrifugation, tert-butyl alcohol washing and vacuum drying at a temperature of 50℃, the unsupported DMC catalyst is obtained.

[0075] Comparative Example 2

[0076] S1: 7 g of zinc chloride was dissolved in a mixture of 30 mL of ultrapure water and 30 mL of tert-butyl alcohol, and stirred at 50°C to obtain solution A;

[0077] S2: 1 g of silicon dioxide was added to solution A, and stirred for 3 h to obtain solution B;

[0078] S3: a potassium ferrocyanide solution (1.5 g of potassium ferrocyanide was dissolved in 30 mL of ultrapure water) was added to solution B, and solution C was obtained by refluxing at a reflux temperature of 120°C for 20 h;

[0079] S4: solution C was dispersed in a mixture of 20 mL of tert-butyl alcohol and 20 mL of water, and stirred at 50°C. After centrifugation, tert-butyl alcohol washing, and vacuum drying at a temperature of 50°C, the silicon dioxide-loaded DMC was obtained.

[0080] Comparative Example 3

[0081] S1: 35 g of zinc chloride was dissolved in a mixture of 30 mL of ultrapure water and 30 mL of tert-butyl alcohol, and stirred at 50°C to obtain solution A. 0.7 g of titanium ethoxide and 0.05 mL of 0.001 M dilute hydrochloric acid were added to solution A, and stirred for 3 h to obtain solution B;

[0082] S2: a potassium ferrocyanide solution (1.5 g of potassium ferrocyanide was dissolved in 30 mL of ultrapure water) was added to solution B, and solution C was obtained by refluxing at a reflux temperature of 120°C for 20 h. Solution C was dispersed in a mixture of 20 mL of tert-butyl alcohol and 20 mL of water, and stirred at 50°C. After centrifugation, tert-butyl alcohol washing, and vacuum drying at a temperature of 50°C, the titanium dioxide-loaded DMC catalyst was obtained.

[0083] Comparative Example 4

[0084] S1: 20 g of zinc chloride was dissolved in a mixture of 50 mL of ultrapure water and 10 mL of tert-butyl alcohol, and stirred at 30°C to obtain solution A. 1.5 g of titanium ethoxide and 0.1 mL of 0.005 M dilute hydrochloric acid were added to solution A, and stirred for 5 h to obtain solution B;

[0085] S2: a potassium ferrocyanide solution (1 g of potassium ferrocyanide was dissolved in 10 mL of ultrapure water) was added to solution B, and solution C was obtained by refluxing at a reflux temperature of 140°C for 10 h. Solution C was dispersed in a mixture of 10 mL of tert-butyl alcohol and 40 mL of water, and stirred at 30°C. After centrifugation, tert-butyl alcohol washing, and vacuum drying at a temperature of 30°C, the titanium dioxide-loaded DMC catalyst was obtained.

[0086] Test Example 1, Catalytic Performance Test

[0087] The catalysts prepared in Examples 1-6 and Comparative Examples 1-4 were used to catalytically prepare isononyl alcohol-based nonionic surfactants according to the following process steps. After the reaction was completed, 5 mL of sample was taken, 10 mL of n-heptane was then added, and after shaking, 2 μL was injected into an HPLC / MS instrument for detection of yield and actual polymerization degree.

[0088] Synthetic process for catalytically preparing isononyl alcohol-based nonionic surfactants:

[0089] a. 100 mL of isononyl alcohol was placed in a high-temperature and high-pressure reaction kettle and stirred at 250 rpm for 30 min. 2 g of the catalyst prepared in Examples 1-6 or Comparative Examples 1-4 was added, and stirring was performed at 250 rpm for 50 min. The high-temperature and high-pressure reaction kettle was subjected to gas replacement with N2 for at least 3 times, and then was subjected to temperature increase. The temperature was increased to 80°C, and the kettle was subjected to a dehydration treatment under reduced pressure at 250 rpm for 2 h.

[0090] b. Under negative pressure, the high-temperature and high-pressure reaction kettle was continuously slowly increased to 155°C, and 180 mL of ethylene oxide was introduced thereinto. The temperature in the kettle was controlled at 155°C, and the pressure was controlled at 0.5 MPa. After the ethylene oxide feeding was completed, the pressure in the reaction kettle was reduced to negative pressure and was maintained unchanged. The reaction kettle was slowly cooled to 75°C, and unreacted ethylene oxide was extracted, thereby preparing an isononyl alcohol-based nonionic surfactant (theoretical polymerization degree 5).

[0091] The polymerization degree and yield of each group are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] From the data in Table 1, it can be seen that the titanium dioxide-supported DMC catalyst prepared in the examples has high catalytic activity, and the isononyl alcohol-based nonionic surfactant prepared has a high yield, and the yield is maintained at 89.5% or more, and the actual polymerization degree is within a reasonable error range of the theoretical polymerization degree.

[0096] The DMC catalyst in Comparative Example 1 is not supported, although it can successfully catalyze the preparation of EO-5 isononyl alcohol-based nonionic surfactant, but the reaction activity is low; the DMC catalyst in Comparative Example 2 uses silica instead of titanium dioxide, and the actual polymerization degree of the isononyl alcohol-based nonionic surfactant prepared by catalysis is greatly different from the theoretical polymerization degree, and the yield is greatly reduced, only 22.6%, indicating that the DMC catalyst prepared by using silica as a substrate cannot better catalyze the preparation of isononyl alcohol-based nonionic surfactant; the ratio of zinc chloride to titanium ethoxide in Comparative Example 3 and Comparative Example 4 is not suitable, and the catalytic activity of the prepared DMC catalyst is significantly reduced.

[0097] The above examples only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. Use of a titanium dioxide supported DMC catalyst in the preparation of an isononyl alcohol based non-ionic surfactant characterised in that, The preparation method of the titanium dioxide supported DMC catalyst comprises the following steps: S1, dissolving zinc chloride, heat preservation stirring, to obtain solution A; adding titanium ethoxide and dilute hydrochloric acid solution to solution A, stirring, to obtain solution B; S2, adding divalent metal potassium cyanide solution to solution B, refluxing, to obtain solution C; dispersing solution C in a mixed solution, stirring, centrifuging, washing, vacuum drying, to obtain the DMC catalyst; The stirring time in step S1 is 3-5 h; The divalent metal potassium cyanide solution in step S2 is at least one selected from the group consisting of potassium ferrocyanide solution, potassium cobalt cyanide solution and potassium nickel cyanide solution.

2. Use according to claim 1, wherein The preparation method of the titanium dioxide supported DMC catalyst at least comprises one of the following (1)-(2): (1) the solvent for dissolving zinc chloride in step S1 is a mixed solution of water and tert-butyl alcohol, wherein the volume ratio of water to tert-butyl alcohol is (0.1-10):1; (2) the temperature for heat preservation stirring in step S1 is 10-100℃, and the stirring time is 0.1-10 h.

3. The use according to claim 1, wherein The preparation method of the titanium dioxide supported DMC catalyst at least comprises one of the following (1)-(4): (1) the mass ratio of titanium ethoxide to zinc chloride in step S1 is (0.1-10):1; (2) the concentration of the dilute hydrochloric acid solution in step S1 is 0.001-0.5M; (3) the amount of the dilute hydrochloric acid solution in step S1 is 0.01-20 mL; (4) the stirring time in step S1 is 0.1-10 h.

4. The use according to claim 1, wherein The preparation method of the titanium dioxide supported DMC catalyst at least comprises one of the following (1)-(6): (1) the adding amount of the divalent metal potassium cyanide solution in step S2 is 1-100 mL, and the concentration of the divalent metal potassium cyanide solution is 0.01-0.5 g / mL; (2) the refluxing temperature in step S2 is 50-200℃, and the refluxing time is 0.1-30 h; (3) the mixed solution in step S2 is a mixed solution of water and tert-butyl alcohol, wherein the volume ratio of water to tert-butyl alcohol is (1-10):1; (4) the stirring temperature in step S2 is 10-100℃, and the stirring time is 1-10 h; (5) the washing solvent in step S2 is tert-butyl alcohol; (6) the vacuum drying temperature in step S2 is 30-100℃.

5. The use according to claim 1, wherein The application comprises the following steps: a, taking isononyl alcohol, stirring in a reaction kettle, adding titanium dioxide supported DMC catalyst, stirring, carrying out gas replacement for multiple times on the reaction kettle, heating, and carrying out vacuum dehydration treatment under stirring condition; b, under negative pressure condition, continuing to heat the reaction kettle, then introducing ethylene oxide into the reaction kettle, controlling the temperature and pressure in the kettle, after the introduction of ethylene oxide is completed, reducing the pressure in the reaction kettle to negative pressure and keeping it unchanged, cooling the reaction kettle, and extracting unreacted ethylene oxide, to obtain isononyl alcohol based nonionic surfactant.

6. The use according to claim 5, wherein the compound is ###0002### At least one of the following (1)-(6) is included: (1) the amount of isononyl alcohol in step a is 10-500 mL; (2) The amount of the titanium dioxide supported DMC catalyst used in step a is 0.01-50 g; (3) The stirring rate in step a is 50-500 rpm, and the stirring time is 5-60 min; (4) The gas used for the gas replacement in step a is N2 or Ar; (5) The temperature increase in step a is to raise the temperature to 50-90℃; (6) The time for the reduced pressure dehydration treatment in step a is 0.5-3 h.

7. The use according to claim 5, wherein the compound is ###0006### At least one of the following (1)-(4) is included: (1) The temperature increase in step b is to raise the temperature to 80-200℃; (2) The amount of the ethylene oxide introduced in step b is 10-500 mL; (3) The temperature and pressure in the kettle in step b are controlled to be 80-200℃ and 0.1-0.9 MPa, respectively; (4) The temperature decrease in step b is to lower the temperature to 50-90℃.

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