Molecular sieve supported dmc catalyst, its preparation method and application

Abstract

The application belongs to the technical field of catalysts, and particularly relates to a molecular sieve loaded DMC catalyst and a preparation method and application thereof. The preparation method of the molecular sieve loaded DMC catalyst comprises the following steps: S1: dissolving zinc chloride, heat preservation and stirring to obtain solution A; S2: dissolving divalent metal potassium cyanide, stirring to obtain solution B; S3: adding ethyl acetoacetate and molecular sieve into water, ultrasonic stirring to obtain solution C; S4: simultaneously dropping solution A and solution B into solution C, heat preservation and stirring, and then centrifuging, washing and vacuum drying to obtain the molecular sieve loaded DMC catalyst. The molecular sieve loaded DMC catalyst prepared by the application has excellent catalytic activity and can efficiently catalyze the preparation of isononyl alcohol based non-ionic surfactant.

Description

Technical Field

[0001] This invention belongs to the field of catalyst technology, specifically relating to a molecular sieve-supported DMC catalyst, its preparation method, and its application. Background Technology

[0002] Fatty alcohol polyoxyethylene ethers are non-toxic, odorless, and biodegradable, making them an important class of nonionic surfactants. Depending on the number of ethylene oxide / propylene oxide additions, fatty alcohol polyoxyethylene ethers can produce a series of products with different properties, thus exhibiting excellent penetration, emulsification, and detergency properties. They have become a major active ingredient in the daily chemical industry, widely used in synthetic detergents and liquid detergents.

[0003] Among fatty alcohol polyoxyethylene ethers, isomeric alcohol polyoxyethylene ethers are widely used in the textile, leather, and daily chemical detergent industries as highly efficient dispersants, wetting agents, and emulsifiers. Currently, they mainly include isomeric decayl alcohol polyoxyethylene ethers, isomeric undecayl alcohol polyoxyethylene ethers, and isomeric tridecayl alcohol polyoxyethylene ethers, but the isononanol-based nonionic surfactant component is lacking. Therefore, there is an urgent need to develop a catalyst capable of efficiently catalyzing the preparation of isononanol-based nonionic surfactants. Summary of the Invention

[0004] This invention aims to provide a molecular sieve-supported DMC catalyst, its preparation method, and its applications. The molecular sieve-supported DMC catalyst prepared by this invention exhibits excellent catalytic activity and can efficiently catalyze the preparation of isononanol-based nonionic surfactants.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing a molecular sieve-supported DMC catalyst, comprising the following steps:

[0006] S1: Dissolve zinc chloride, keep warm and stir to obtain solution A;

[0007] S2: Dissolve potassium dicyanide and stir to obtain solution B;

[0008] S3: Add ethyl acetoacetate and molecular sieve to water, and stir ultrasonically to obtain solution C;

[0009] S4: Add solution A and solution B dropwise to solution C simultaneously, keep warm and stir, and then centrifuge, wash and vacuum dry to obtain the molecular sieve supported DMC catalyst.

[0010] Preferably, the solvent for dissolving zinc chloride in step S1 is a mixture of water and tert-butanol. The volume ratio of the added pure water to tert-butanol is (0.1-10):1, and the mass ratio of zinc chloride to the solvent is 1:(8-20).

[0011] Preferably, the temperature for heat preservation and stirring in step S1 is 10-100℃, and the stirring time is 0.1-10h.

[0012] Preferably, the solvent for dissolving the divalent metal potassium cyanide in step S2 is water.

[0013] Preferably, the divalent metal potassium cyanide in step S2 includes at least one of potassium ferrocyanide, potassium cobalt cyanide, and potassium nickel cyanide.

[0014] Preferably, the mass ratio of potassium divalent metal cyanide to solvent in step S2 is 1:(5-30).

[0015] Preferably, the stirring time in step S2 is 0.1-10 hours.

[0016] Preferably, the amount of ethyl acetoacetate added in step S3 is 1-50g.

[0017] Preferably, the mass ratio of the molecular sieve to zinc chloride in step S3 is (1-10):1.

[0018] Preferably, the molecules screened in step S3 are selected from at least one of Beta, MCM-22, and X zeolite.

[0019] Preferably, the ultrasonic stirring time in step S3 is 0.1-10 h.

[0020] Preferably, the temperature for heat preservation and stirring in step S4 is 10-100℃, and the stirring time is 1-10h.

[0021] Preferably, the solvent used for washing in step S4 is water.

[0022] Preferably, the temperature for vacuum drying in step S4 is 30-100°C.

[0023] The present invention also claims protection for a method for preparing the molecular sieve-supported DMC catalyst described above, resulting in a molecular sieve-supported DMC catalyst.

[0024] The present invention also claims protection for the use of the DMC catalyst supported on the molecular sieve in the preparation of isononyl alcohol-based nonionic surfactants.

[0025] This invention also claims protection for a method for preparing an isononanol-based nonionic surfactant using the DMC catalyst supported on the molecular sieve, comprising the following steps:

[0026] a. Take isononol, put it into the reaction vessel and stir, add the DMC catalyst supported on the molecular sieve, stir, and after the reaction vessel is purged with gas multiple times, heat it up and perform dehydration under reduced pressure under stirring conditions.

[0027] b. Under negative pressure conditions, after the reactor is heated further, ethylene oxide is introduced into it, and the temperature and pressure inside the reactor are controlled. After the ethylene oxide feeding is completed, the pressure inside the reactor is reduced to negative pressure and then kept constant. The reactor is then cooled down, and the unreacted ethylene oxide is extracted to obtain isononyl alcohol-based nonionic surfactant.

[0028] Preferably, the amount of isononol used in step a is 10-500 mL. The isononol used in this invention can be selected from products manufactured by Sinopec Maoming Petrochemical Company.

[0029] Preferably, the amount of the DMC catalyst supported on the molecular sieve in step a is 0.01-50g.

[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 heating in step a is to raise the temperature to 50-90°C.

[0033] Preferably, the dehydration process in step a takes 0.5-3 hours.

[0034] Preferably, the continued heating in step b refers to raising the temperature to 80-200°C.

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

[0036] Preferably, the temperature and pressure inside the vessel in step b are controlled as follows: the temperature inside the vessel is controlled at 80-200℃ and the pressure is controlled at 0.1-0.9MPa.

[0037] Preferably, cooling the reactor in step b means reducing the temperature to 50-90°C.

[0038] The isononol-based nonionic surfactants prepared using the DMC catalyst supported on the molecular sieve in this invention include, but are not limited to, EO-5 isononol-based nonionic surfactant, EO-7 isononol-based nonionic surfactant, EO-9 isononol-based nonionic surfactant, and EO-13 isononol-based nonionic surfactant.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The molecular sieve-supported DMC catalyst prepared by the present invention uses a molecular sieve with a special pore structure, which can bind more DMC sites. At the same time, the presence of pores increases the contact area between the catalyst and the reactants, thereby effectively improving the catalytic activity.

[0041] (2) The present invention applies the DMC catalyst supported on molecular sieve to the synthesis process of isononanol-based nonionic surfactants, and successfully prepares isononanol-based nonionic surfactants with different EO numbers, which opens up a new way to improve the comprehensive optimization and deep utilization of Maoming Petrochemical's product resources and promotes the refinement and diversification of downstream products. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Unless otherwise specified, the experimental methods used in the examples and comparative examples are conventional methods, and the materials and reagents used are commercially available unless otherwise specified.

[0044] Example 1

[0045] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0046] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0047] S3: Add 20g of ethyl acetoacetate and 15g of molecular sieve MCM-22 to 50mL of ultrapure water, and sonicate for 3h to obtain solution C;

[0048] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0049] Example 2

[0050] S1: Dissolve 5g of zinc chloride in a mixture of 20mL of ultrapure water and 60mL of tert-butanol, and keep it at 30℃ and stir for 2h to obtain solution A;

[0051] S2: Dissolve 2g of potassium ferrocyanide in 20mL of ultrapure water and stir for 0.5h to obtain solution B;

[0052] S3: Add 10g of ethyl acetoacetate and 20g of molecular sieve Beta to 30mL of ultrapure water and stir ultrasonically for 2h to obtain solution C;

[0053] S4: Under the condition of keeping the temperature at 30℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 30℃ for 8 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 30℃.

[0054] Example 3

[0055] S1: Dissolve 8g of zinc chloride in a mixture of 10mL of ultrapure water and 80mL of tert-butanol, and keep it at 60℃ and stir for 5h to obtain solution A;

[0056] S2: Dissolve 3.5g of potassium cobalt cyanide in 30mL of ultrapure water and stir for 2h to obtain solution B;

[0057] S3: Add 30g of ethyl acetoacetate and 40g of molecular sieve X zeolite to 50mL of ultrapure water and stir ultrasonically for 6h to obtain solution C;

[0058] S4: Under the condition of keeping the temperature at 60℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 60℃ for 3 hours. After centrifugation, washing with ultrapure water, and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0059] Example 4

[0060] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0061] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0062] S3: Add 20g of ethyl acetoacetate and 30g of molecular sieve MCM-22 to 50mL of ultrapure water, and stir ultrasonically for 3h to obtain solution C;

[0063] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0064] Example 5

[0065] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0066] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0067] S3: Add 20g of ethyl acetoacetate and 15g of molecular sieve Beta to 50mL of ultrapure water and sonicate for 3h to obtain solution C;

[0068] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0069] Example 6

[0070] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0071] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0072] S3: Add 30g of ethyl acetoacetate and 15g of molecular sieve MCM-22 to 50mL of ultrapure water, and stir ultrasonically for 3h to obtain solution C;

[0073] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0074] Comparative Example 1

[0075] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0076] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0077] S3: Under the condition of keeping the temperature at 50℃, solution A is added dropwise to solution B, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water, and vacuum drying, the DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0078] Comparative Example 2

[0079] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0080] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0081] S3: Add 15g of molecular sieve MCM-22 to 50mL of ultrapure water and stir ultrasonically for 3h to obtain solution C;

[0082] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water, vacuum drying and other processes, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0083] The only difference between this comparative example and Example 1 is that ethyl acetoacetate is not added.

[0084] Comparative Example 3

[0085] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0086] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0087] S3: Add 20g of ethyl acetoacetate and 15g of Y-type molecular sieve to 50mL of ultrapure water, and stir ultrasonically for 3h to obtain solution C;

[0088] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water and vacuum drying, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0089] Compared with Example 1, the only difference in this comparative example is that a Y-type molecular sieve was used.

[0090] Comparative Example 4

[0091] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0092] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0093] S3: Add 20g of ethyl acetoacetate and 60g of molecular sieve MCM-22 to 50mL of ultrapure water, and stir ultrasonically for 3h to obtain solution C;

[0094] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water, vacuum drying and other processes, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0095] Comparative Example 5

[0096] S1: Dissolve 3g of zinc chloride in a mixture of 20mL of ultrapure water and 20mL of tert-butanol, and keep it at 50℃ and stir for 1h to obtain solution A;

[0097] S2: Dissolve 1g of potassium ferrocyanide in 10mL of ultrapure water and stir for 1h to obtain solution B;

[0098] S3: Add 20g of ethyl acetoacetate and 1g of molecular sieve MCM-22 to 50mL of ultrapure water, and sonicate for 3h to obtain solution C;

[0099] S4: Under the condition of keeping the temperature at 50℃, solution A and solution B are simultaneously added dropwise to solution C, and stirred at 50℃ for 5 hours. After centrifugation, washing with ultrapure water, vacuum drying and other processes, the molecular sieve supported DMC catalyst is obtained. The vacuum drying temperature is 50℃.

[0100] Experimental Example 1: Catalytic Performance Test

[0101] The catalysts obtained in Examples 1-6 and Comparative Examples 1-5 were used to catalyze the preparation of isononanol-based nonionic surfactants according to the following process steps. After the reaction was completed, 5 mL of sample was taken out, followed by the addition of 10 mL of n-heptane. After shaking well, 2 μL of the sample was injected into a high-performance liquid chromatography-mass spectrometry / mass spectrometer for the detection of yield and actual degree of polymerization.

[0102] Synthetic process for the catalytic preparation of isononyl alcohol-based nonionic surfactants:

[0103] a. Take 150 mL of isononol and put it into a high-temperature and high-pressure reactor. Stir at 300 rpm for 30 min. Add 5 g of the catalyst prepared in Examples 1-6 or Comparative Examples 1-4. Stir at 300 rpm for 50 min. Replace the high-temperature and high-pressure reactor with N2 gas at least 3 times. Then raise the temperature to 80°C and perform dehydration under reduced pressure for 2 h under stirring at 300 rpm.

[0104] b. Under negative pressure conditions, the high-temperature and high-pressure reactor is slowly heated to 175°C, and 280 mL of ethylene oxide is introduced into it. The temperature inside the reactor is controlled at 175°C and the pressure at 0.5 MPa. After the ethylene oxide feeding is completed, the pressure inside the reactor is reduced to negative pressure and then kept constant. The reactor is then slowly cooled to 75°C, and the unreacted ethylene oxide is extracted to obtain isononyl alcohol-based nonionic surfactant (theoretical degree of polymerization 7).

[0105] The catalytic performance test results are shown in Table 1.

[0106] Table 1

[0107]

[0108] The experimental data in Table 1 show that the molecular sieve-supported DMC catalyst prepared in the embodiments of the present invention has high catalytic activity, and the prepared isononanol-based nonionic surfactant can achieve a high yield, with the yield maintained above 90%, and the actual degree of polymerization is within the reasonable error range of the theoretical degree of polymerization.

[0109] In Comparative Example 1, without the addition of molecular sieve components, the catalyst prepared showed lower catalytic activity in the preparation of isononyl alcohol-based nonionic surfactants. This may be because when the molecular sieve substrate is absent, the DMC catalyst particles are larger and agglomerated, thereby reducing the active surface area and ultimately weakening the catalytic activity.

[0110] The isononanol-based nonionic surfactant prepared in Comparative Example 2 had an actual degree of polymerization of 6.8, which is within a reasonable error range from the theoretical degree of polymerization of 7. However, the yield was only 58.5%, indicating that the use of ethyl acetoacetate plays an important role in the preparation of DMC catalyst supported on molecular sieves, directly affecting whether the molecular sieve substrate can combine with DMC, and thus ultimately affecting the catalytic activity in the preparation of isononanol-based nonionic surfactants.

[0111] The isononanol-based nonionic surfactant prepared in Comparative Example 3 had an actual degree of polymerization of 5.4, which differed significantly from the theoretical degree of polymerization of 7, and the yield was low at 66.2%. This indicates that the addition of Y-type molecular sieves prevented the final molecular sieve-supported DMC from effectively catalyzing the preparation of isononanol-based nonionic surfactants.

[0112] The isononanol-based nonionic surfactant prepared in Comparative Example 4 had an actual degree of polymerization of 5.9, which differed significantly from the theoretical degree of polymerization of 7, and the yield was only 51.3%. The isononanol-based nonionic surfactant prepared in Comparative Example 5 had an actual degree of polymerization of 6.9, which was within a reasonable error range from the theoretical degree of polymerization of 7, but the yield was only 68.6%. The data from Comparative Examples 4 and 5 show that only when the amount of molecular sieve is within a certain range can it improve catalytic activity. Too much molecular sieve will cover the original DMC sites, thereby reducing the number of catalytically active sites and weakening the reaction activity; while too little molecular sieve will not disperse the DMC particles and is also not conducive to improving catalytic activity.

[0113] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. The application of a molecular sieve-supported DMC catalyst in the preparation of isononanol-based nonionic surfactants, characterized in that, The method for preparing the molecular sieve-supported DMC catalyst includes the following steps: S1: Dissolve zinc chloride, keep warm and stir to obtain solution A; S2: Dissolve potassium dicyanide and stir to obtain solution B; S3: Add ethyl acetoacetate and molecular sieve to water, and stir ultrasonically to obtain solution C; S4: Add solution A and solution B dropwise to solution C simultaneously, keep warm and stir, and after centrifugation, washing and vacuum drying, the DMC catalyst supported on the molecular sieve is obtained; The solvent used to dissolve zinc chloride in step S1 is a mixture of water and tert-butanol; The divalent metal potassium cyanide mentioned in step S2 includes at least one of potassium ferrocyanide, potassium cobalt cyanide, and potassium nickel cyanide; The amount of ethyl acetoacetate added in step S3 is 1-50g; The mass ratio of molecular sieve to zinc chloride in step S3 is (1-10):1; The molecules described in step S3 are selected from at least one of Beta, MCM-22, and X zeolite.

2. The application of the molecular sieve-supported DMC catalyst as described in claim 1 in the preparation of isononanol-based nonionic surfactants, characterized in that, The temperature for heat preservation and stirring in step S1 is 10-100℃, and the stirring time is 0.1-10h.

3. The application of the molecular sieve-supported DMC catalyst as described in claim 1 in the preparation of isononanol-based nonionic surfactants, characterized in that, It must include at least one of the following (1) to (2): (1) The solvent for dissolving the divalent metal potassium cyanide in step S2 is water; (2) The stirring time in step S2 is 0.1-10h.

4. The application of the molecular sieve-supported DMC catalyst as described in claim 1 in the preparation of isononanol-based nonionic surfactants, characterized in that, The ultrasonic stirring time in step S3 is 0.1-10h.

5. The application of the molecular sieve-supported DMC catalyst as described in claim 1 in the preparation of isononanol-based nonionic surfactants, characterized in that, It must include at least one of the following (1) to (3): (1) The temperature for heat preservation and stirring in step S4 is 10-100℃, and the stirring time is 1-10h; (2) The solvent used for washing in step S4 is water; (3) The temperature of vacuum drying in step S4 is 30-100℃.

6. A method for preparing an isononyl alcohol-based nonionic surfactant, characterized in that, Includes the following steps: a. Take isononol, put it into the reaction vessel and stir. Add the DMC catalyst supported on molecular sieve, stir, and after the reaction vessel is purged with gas multiple times, heat it up and perform dehydration under reduced pressure under stirring conditions. b. Under negative pressure conditions, after the reactor is heated, ethylene oxide is introduced into it, and the temperature and pressure inside the reactor are controlled. After the ethylene oxide feeding is completed, the pressure inside the reactor is reduced to negative pressure and then kept constant. The reactor is cooled down, and the unreacted ethylene oxide is extracted to obtain isononyl alcohol-based nonionic surfactant. The method for preparing the molecular sieve-supported DMC catalyst includes the following steps: S1: Dissolve zinc chloride, keep warm and stir to obtain solution A; S2: Dissolve potassium dicyanide and stir to obtain solution B; S3: Add ethyl acetoacetate and molecular sieve to water, and stir ultrasonically to obtain solution C; S4: Add solution A and solution B dropwise to solution C simultaneously, keep warm and stir, and after centrifugation, washing and vacuum drying, the DMC catalyst supported on the molecular sieve is obtained; The solvent used to dissolve zinc chloride in step S1 is a mixture of water and tert-butanol; The divalent metal potassium cyanide mentioned in step S2 includes at least one of potassium ferrocyanide, potassium cobalt cyanide, and potassium nickel cyanide; The amount of ethyl acetoacetate added in step S3 is 1-50g; The mass ratio of molecular sieve to zinc chloride in step S3 is (1-10):1; The molecules described in step S3 are selected from at least one of Beta, MCM-22, and X zeolite.

7. The method for preparing the isononyl alcohol-based nonionic surfactant as described in claim 6, characterized in that, It must include at least one of the following (1) to (6): (1) The amount of isononol used in step a is 10-500 mL; (2) The amount of DMC catalyst supported on molecular sieve mentioned in step a is 0.01-50g; (3) The stirring rate in step a is 50-500 rpm and the stirring time is 5-60 min; (4) The gas used for gas replacement in step a is selected as N2 or Ar; (5) The heating mentioned in step a refers to raising the temperature to 50-90℃; (6) The time for the dehydration treatment described in step a is 0.5-3h.

8. The method for preparing the isononanol-based nonionic surfactant as described in claim 6, characterized in that, It must include at least one of the following (1) to (4): (1) The continued heating mentioned in step b refers to raising the temperature to 80-200℃; (2) The amount of ethylene oxide introduced in step b is 10-500 mL; (3) The temperature and pressure inside the vessel mentioned in step b are controlled to be 80-200℃ and 0.1-0.9MPa. (4) The step b mentioned cooling the reactor is to reduce the temperature to 50-90℃.

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