Surfactant based on dioctyl sodium sulfosuccinate and surfactant
By using sulfur trioxide gas to perform the sulfonation reaction in the preparation process of diisooctyl succinate sodium sulfonate, the problems of long esterification reaction and low initial rate of sulfonation reaction in the prior art were solved, and the preparation of high-efficiency and low impurity surfactants were achieved.
Patent Information
- Application Number
- CN202510297914.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2025-06-13
AI Technical Summary
In the existing preparation method for diisooctaned succinate sodium sulfonate, the isooctaned alcohol in the esterification reaction is large, the reaction temperature is high, and the time is long, and it needs to be processed through a number of cumbersome processes; the initial rate of the sulfonation reaction is low, the reaction time is long, and it is easy to introduce additional impurities, affecting the product quality.
The sulfonation reaction was carried out in a falling film sulfonation sulfonator using sulfur trioxide gas and diisooctyl succinate, and the molar ratio of sulfur trioxide to diisooctyl succinate was controlled to be between 0.95 and 1.05:1, the sulfonation temperature was between 40 and 50°C, and the reaction time was between 0.1 and 0.3 s. Then the neutralization reaction was carried out to obtain a surfactant.
The prepared surfactant has low impurity content, excellent performance, mild sulfonation conditions, short time, simple industrial production process, and environmentally friendly.
Abstract
Description
Technical Field
[0001] This application relates to the technical field of surfactants, in particular to surfactants based on sodium diisooctyl sulfosuccinate and surfactants. Background Art
[0002] Sodium diisooctyl sulfosuccinate, as an anionic surfactant, has excellent wetting, penetration and other properties. It is widely used in textile printing and dyeing, medicine, coatings, chemical engineering and other fields. Currently, the commonly disclosed preparation method of sodium diisooctyl sulfosuccinate usually adopts a two-step method. The first step is the esterification reaction to prepare diisooctyl succinate, the esterification reaction of maleic anhydride and isooctanol catalyzed by inorganic acid or organic acid; the second step is the sulfonation reaction, the sulfonation reaction of the esterification product and an aqueous solution of sodium bisulfite. However, in the esterification reaction of the currently disclosed method, the input amount of isooctanol is large, and the reaction temperature is high, and the reaction time is also long; and the esterification product needs to be treated by a number of cumbersome processes; in addition, the initial rate of the sulfonation reaction is low, the reaction time is long, and relevant catalysts need to be added, which will lead to the introduction of additional impurities and affect the quality of the whole product. Therefore, it is very necessary to invent a new method for simply and efficiently preparing sodium diisooctyl sulfosuccinate. Summary of the Invention
[0003] In order to solve at least one of the above technical problems and develop a surfactant based on sodium diisooctyl sulfosuccinate with low impurity content and excellent performance, this application provides a surfactant based on sodium diisooctyl sulfosuccinate and a surfactant.
[0004] On the one hand, the preparation method of the surfactant based on sodium diisooctyl sulfosuccinate provided by this application includes the following steps:
[0005] S1. Generate sulfur trioxide gas
[0006] Liquid sulfur enters the sulfur burner for combustion to generate sulfur dioxide gas, and the sulfur dioxide gas passes through the conversion tower to convert sulfur dioxide into sulfur trioxide gas;
[0007] S2. Prepare a mixed gas
[0008] Pure air is introduced and cooled to obtain a mixed gas with a sulfur trioxide gas concentration of 3.5 - 5.0%;
[0009] S3. Sulfonation reaction
[0010] The mixed gas prepared in S2 and diisooctyl succinate are simultaneously introduced into a falling film sulfonator for reaction; the feeding amounts of the sulfur trioxide mixed gas and diisooctyl succinate are controlled so that the molar ratio of sulfur trioxide to diisooctyl succinate in the sulfur trioxide mixed gas is 0.95 to 1.05:1, the sulfonation temperature is 40 to 50 °C, and the reaction time is 0.1 to 0.3 s;
[0011] S4, Neutralization reaction
[0012] The sulfonated diisooctyl succinate acid ester is introduced into a neutralization system, and 32% NaOH solution and pure water are pumped in. The neutralization temperature is controlled at 40 to 45 °C, and the neutralization time is 1 to 3 h.
[0013] Optionally, in S1, after the liquid sulfur enters the sulfur burner, the air in the furnace is first heated to 250 to 280 °C, and then ignition is carried out.
[0014] Optionally, in S1, the inside of the conversion tower is filled with a vanadium pentoxide bed.
[0015] Optionally, in S1, the temperature of the sulfur trioxide gas is 250 to 280 °C.
[0016] Optionally, in S2, the parameters of the pure air are: air dew point -90 to -60 °C, and the water content is at the ppm level.
[0017] Optionally, in S2, it is cooled to 50 to 60 °C.
[0018] Optionally, by controlling the weight ratio of the 32% NaOH solution to pure water to be 1:2.55 to 2.59, a surfactant with an active matter content of 50% is obtained.
[0019] Optionally, by controlling the weight ratio of the 32% NaOH solution to pure water to be 1:0.34 to 0.38, a surfactant with an active matter content of 75% is obtained.
[0020] In a second aspect, the present application provides a surfactant prepared by the above preparation method.
[0021] In a third aspect, the present application provides the use of the above surfactant in the field of textile printing and dyeing.
[0022] In summary, the present invention includes at least one of the following beneficial technical effects:
[0023] 1. The prepared surfactant has low impurity content, good appearance color, few unsulfonated substances, low inorganic salt content, and strong penetration power;
[0024] 2. The sulfonation conditions are mild, the sulfonation time is short, and the industrial production process is green, environmentally friendly and simple. Specific embodiments
[0025] The following further elaborates on this application in conjunction with embodiments.
[0026] In the following embodiments of this application, unless otherwise specified, the main components involved are all purchased from commercially available products.
[0027] Process air: Air that has been treated by a Roots blower and a filtration device to remove impurities and moisture.
[0028] Embodiment
[0029] Embodiments 1 to 6 are used to prepare surfactants based on sodium diisooctyl sulfosuccinate with an active substance content of 50%, specifically as follows.
[0030] Embodiment 1
[0031] First, heat the sulfur burner to 250°C, then transfer liquid sulfur from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. Through the heat generated by combustion, keep the temperature in the furnace between 250 and 280°C. After that, pass the generated sulfur dioxide gas through a conversion tower and catalyze it into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 3.5%.
[0032] React sodium diisooctyl sulfosuccinate with the above sulfur trioxide mixed gas in a multi-tube falling film sulfonation reactor at a molar ratio of 1:1.00 for 0.2 s to prepare sodium diisooctyl sulfosuccinate acid ester.
[0033] Introduce 48.42 parts by weight of sodium diisooctyl sulfosuccinate acid ester into the neutralization system, add 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.3 to obtain 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, introduce the finished product into a storage tank with a storage temperature of 45°C.
[0034] Embodiment 2
[0035] First, heat the sulfur burner to 250°C, then transfer liquid sulfur from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. Through the heat generated by combustion, keep the temperature in the furnace between 250 and 280°C. After that, pass the generated sulfur dioxide gas through a conversion tower and catalyze it into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.0%.
[0036] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:1.00, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate sulfonate.
[0037] 48.42 parts by weight of diisooctyl succinate sulfonate are introduced into the neutralization system, and 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water are added for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH is 6.5, and 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate is obtained, with an appearance of a colorless to light yellow viscous liquid. Finally, the finished product is introduced into a storage tank, and the storage temperature is 45 °C.
[0038] Example 3
[0039] First, the sulfur burner is heated to 250 °C, and then liquid sulfur is transported from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. Through the heat generated by combustion, the temperature in the furnace is maintained between 250 and 280 °C. Then, the generated sulfur dioxide gas is passed through a conversion tower and catalyzed into sulfur trioxide gas by vanadium pentoxide. The sulfur trioxide gas is mixed with process air (air dew point -60 °C) and cooled to between 50 and 60 °C to prepare a mixed gas with a sulfur trioxide gas concentration of 5.0%.
[0040] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:1.00, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate sulfonate.
[0041] 48.42 parts by weight of diisooctyl succinate sulfonate are introduced into the neutralization system, and 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water are added for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH is 6.4, and 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate is obtained, with an appearance of a colorless to light yellow viscous liquid. Finally, the finished product is introduced into a storage tank, and the storage temperature is 45 °C.
[0042] Example 4
[0043] First, the sulfur burner is heated to 250 °C, and then liquid sulfur is transported from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. Through the heat generated by combustion, the temperature in the furnace is maintained between 250 and 280 °C. Then, the generated sulfur dioxide gas is passed through a conversion tower and catalyzed into sulfur trioxide gas by vanadium pentoxide. The sulfur trioxide gas is mixed with process air (air dew point -60 °C) and cooled to between 50 and 60 °C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.0%.
[0044] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:0.95, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate sulfonate.
[0045] 48.42 parts by weight of diisooctyl succinate sulfonate are introduced into the neutralization system, and 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water are added for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.7 to obtain 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, the finished product is introduced into the storage tank, and the storage temperature is 45°C.
[0046] Example 5
[0047] First, the sulfur burner is heated to 250°C, and then liquid sulfur is transported from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. The heat generated by combustion keeps the furnace temperature between 250 and 280°C. After that, the generated sulfur dioxide gas passes through the conversion tower and is catalyzed into sulfur trioxide gas by vanadium pentoxide. The sulfur trioxide gas is mixed with process air (air dew point -60°C) and cooled to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.0%.
[0048] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:1.05, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate sulfonate.
[0049] 48.42 parts by weight of diisooctyl succinate sulfonate are introduced into the neutralization system, and 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water are added for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.8 to obtain 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, the finished product is introduced into the storage tank, and the storage temperature is 45°C.
[0050] Example 6
[0051] First, the sulfur burner is heated to 250°C, and then liquid sulfur is transported from the sulfur storage tank to the sulfur burner to produce sulfur dioxide gas. The heat generated by combustion keeps the furnace temperature between 250 and 280°C. After that, the generated sulfur dioxide gas passes through the conversion tower and is catalyzed into sulfur trioxide gas by vanadium pentoxide. The sulfur trioxide gas is mixed with process air (air dew point -60°C) and cooled to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.5%.
[0052] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:1.05, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate acid ester.
[0053] Introduce 48.42 parts by weight of diisooctyl succinate acid ester into the neutralization system, add 14.37 parts by weight of 32% sodium hydroxide aqueous solution and 37.21 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH is 6.8 to obtain 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, and the appearance is a colorless to light yellow viscous liquid. Finally, the finished product is introduced into the storage tank, and the storage temperature is 45 °C.
[0054] Perform performance tests on the surfactants prepared in Examples 1 to 6. Among them, the permeability test is carried out by the canvas sedimentation method (HG / T 4919-2016), and the test results are shown in Table 1.
[0055] Table 1
[0056] Surfactant Active matter content / % Solid content / % pH value Inorganic salt / % Permeability Example 1 48.7 49.5 6.3 0.3 ≤4s Example 2 48.5 49.1 6.5 0.4 ≤3s Example 3 48.7 49.5 6.4 0.6 ≤4s Example 4 48.3 49.3 6.7 0.3 ≤3s Example 5 48.5 49.3 6.8 0.6 ≤3s Example 6 48.2 49.3 6.8 0.7 ≤4s
[0057] It can be seen from Examples 1 to 6 and Table 1 that the surfactant with a solid content of 50% prepared by the technical solution of the present application has a low inorganic salt content, not exceeding 0.7%; and excellent permeability, lower than 4 s.
[0058] Among them, when the concentration of sulfur trioxide in the technical solution of the present application is controlled at 4.0%, the permeability of the surfactant with a solid content of 50% prepared is lower than 3 s, and the permeation performance is more excellent compared with other examples.
[0059] Examples 7 to 12 are used to prepare a surfactant based on sodium diisooctyl sulfosuccinate with an active ingredient content of 75%, as follows.
[0060] Example 7
[0061] First, heat the sulfur burner to 250 °C, then transport the liquid sulfur from the sulfur storage tank to the sulfur burner to burn and produce sulfur dioxide gas. Through the heat generated by combustion, the temperature in the furnace is maintained between 250 and 280 °C. Then, the generated sulfur dioxide gas is passed through the conversion tower and catalyzed into sulfur trioxide gas by vanadium pentoxide. The sulfur trioxide gas and process air are mixed (air dew point -60 °C) and cooled to between 50 and 60 °C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.0%.
[0062] The diisooctyl succinate is mixed with the above sulfur trioxide mixed gas in a molar ratio of 1:1.00, and a sulfonation reaction is carried out in a multi-tube falling film sulfonation reactor. The sulfonation reaction time is 0.2 s to prepare diisooctyl succinate acid ester.
[0063] Introduce 70.52 parts by weight of diisooctyl succinate into the neutralization system, add 21.59 parts by weight of 32% sodium hydroxide aqueous solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.5, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, introduce the finished product into the storage tank, and the storage temperature is 45°C.
[0064] Example 8
[0065] First, heat the sulfur burner to 250°C, then transport liquid sulfur from the sulfur storage tank to the sulfur burner to burn and produce sulfur dioxide gas. Through the heat generated by combustion, keep the temperature in the furnace between 250 and 280°C. After that, pass the generated sulfur dioxide gas through the conversion tower, and catalyze it into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.0%.
[0066] Mix diisooctyl succinate with the above sulfur trioxide mixed gas in a molar ratio of 1:1.05, and carry out a sulfonation reaction in a multi-tube falling film sulfonation reactor for 0.2 s to prepare diisooctyl succinate acid ester.
[0067] Introduce 70.52 parts by weight of diisooctyl succinate acid ester into the neutralization system, add 21.59 parts by weight of 32% sodium hydroxide aqueous solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.5, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, introduce the finished product into the storage tank, and the storage temperature is 45°C.
[0068] Example 9
[0069] First, heat the sulfur burner to 250°C, then transport liquid sulfur from the sulfur storage tank to the sulfur burner to burn and produce sulfur dioxide gas. Through the heat generated by combustion, keep the temperature in the furnace between 250 and 280°C. After that, pass the generated sulfur dioxide gas through the conversion tower, and catalyze it into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 3.8%.
[0070] Mix diisooctyl succinate with the above sulfur trioxide mixed gas in a molar ratio of 1:1.00, and carry out a sulfonation reaction in a multi-tube falling film sulfonation reactor for 0.2 s to prepare diisooctyl succinate acid ester.
[0071] Introduce 70.52 parts by weight of diisooctyl sulfosuccinate into the neutralization system, add 21.59 parts by weight of 32% aqueous sodium hydroxide solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.3, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, transfer the finished product into a storage tank with a storage temperature of 45°C.
[0072] Example 10
[0073] First, heat the sulfur-burning furnace to 250°C, then transfer liquid sulfur from the sulfur storage tank to the sulfur-burning furnace to produce sulfur dioxide gas. Through the heat generated by combustion, keep the furnace temperature between 250 and 280°C. After that, pass the generated sulfur dioxide gas through a conversion tower, and it is catalyzed into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 4.5%.
[0074] Mix diisooctyl succinate with the above sulfur trioxide mixed gas in a molar ratio of 1:1.05, and carry out a sulfonation reaction in a multi-tube falling film sulfonation reactor for 0.2 s to prepare diisooctyl sulfosuccinate.
[0075] Introduce 70.52 parts by weight of diisooctyl sulfosuccinate into the neutralization system, add 21.59 parts by weight of 32% aqueous sodium hydroxide solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.5, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, transfer the finished product into a storage tank with a storage temperature of 45°C.
[0076] Example 11
[0077] First, heat the sulfur-burning furnace to 250°C, then transfer liquid sulfur from the sulfur storage tank to the sulfur-burning furnace to produce sulfur dioxide gas. Through the heat generated by combustion, keep the furnace temperature between 250 and 280°C. After that, pass the generated sulfur dioxide gas through a conversion tower, and it is catalyzed into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas and process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 5.0%.
[0078] Mix diisooctyl succinate with the above sulfur trioxide mixed gas in a molar ratio of 1:0.95, and carry out a sulfonation reaction in a multi-tube falling film sulfonation reactor for 0.2 s to prepare diisooctyl sulfosuccinate.
[0079] Introduce 70.52 parts by weight of diisooctyl sulfosuccinate into the neutralization system, add 21.59 parts by weight of 32% sodium hydroxide aqueous solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.3, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, transfer the finished product into a storage tank, and the storage temperature is 45°C.
[0080] Example 12
[0081] First, heat the sulfur-burning furnace to 250°C, then transport liquid sulfur from the sulfur storage tank to the sulfur-burning furnace to produce sulfur dioxide gas. Through the heat generated by combustion, keep the temperature in the furnace between 250 and 280°C. After that, pass the generated sulfur dioxide gas through a conversion tower and catalyze it into sulfur trioxide gas by vanadium pentoxide. Mix the sulfur trioxide gas with process air (air dew point -60°C) and cool it to between 50 and 60°C to prepare a mixed gas with a sulfur trioxide gas concentration of 3.5%.
[0082] Mix diisooctyl succinate with the above sulfur trioxide mixed gas in a molar ratio of 1:0.95 and carry out a sulfonation reaction in a multi-tube falling film sulfonation reactor for 0.2 s to prepare diisooctyl sulfosuccinate.
[0083] Introduce 70.52 parts by weight of diisooctyl sulfosuccinate into the neutralization system, add 21.59 parts by weight of 32% sodium hydroxide aqueous solution and 7.89 parts by weight of pure water for neutralization reaction. The neutralization reaction lasts for 2 hours until the system pH reaches 6.5, obtaining 100 parts by weight of a surfactant based on sodium diisooctyl sulfosuccinate, with an appearance of a colorless to light yellow viscous liquid. Finally, transfer the finished product into a storage tank, and the storage temperature is 45°C.
[0084] Conduct performance tests on the surfactants prepared in Examples 7 - 12. Among them, the permeability test adopts the canvas sedimentation method (HG / T 4919 - 2016), and the test results are shown in Table 2.
[0085] Table 2
[0086] Surfactant Active matter content / % Solid content / % pH value Inorganic salt / % Permeability Example 7 73.7 74.9 6.5 0.4 ≤3s Example 8 73.5 74.5 6.5 0.6 ≤3s Example 9 73.2 74.5 6.3 0.5 ≤3s Example 10 73.9 74.8 6.5 0.6 ≤3s Example 11 73.1 74.8 6.2 0.6 ≤3s Example 12 73.2 74.8 6.5 0.2 ≤2s
[0087] From Examples 7 - 12 and Table 2, it can be seen that the surfactant with a solid content of 75% prepared by the technical solution of this application has a low inorganic salt content, not exceeding 0.6%; and excellent permeability, lower than 3 s.
[0088] When the concentration of sulfur trioxide in the technical solution of the present application is controlled at 3.5% and the diisooctyl succinate is mixed with the above sulfur trioxide gas in a molar ratio of 1:0.95, the surfactant with a solid content of 75% prepared has a penetration rate lower than 2 s and the content of inorganic salts does not exceed 0.2%. Compared with other embodiments, the performance is better.
[0089] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A method for preparing a surfactant based on sodium diisooctyl sulfosuccinate, characterized in that: The following steps are involved: S1, generate sulfur trioxide gas Liquid sulfur enters the sulfur-burning furnace for combustion, generating sulfur dioxide gas, which then passes through a conversion tower to convert sulfur dioxide into sulfur trioxide gas; S2. Preparation of mixed gas Pure air is introduced and the temperature is lowered to obtain a mixed gas with a sulfur trioxide concentration of 3.5 to 5.0%; S3. Sulfonation reaction The mixed gas prepared in S2 and diisooctyl succinate are simultaneously introduced into a falling film sulfonator for reaction; the introduction amount of the sulfur trioxide mixed gas and diisooctyl succinate is controlled so that the molar ratio of sulfur trioxide to diisooctyl succinate in the sulfur trioxide mixed gas is 0.95-1.05:1, the sulfonation temperature is 40-50°C, and the reaction time is 0.1-0.3s; S4. Neutralization reaction The sulfonated diisooctyl succinate is introduced into the neutralization system, 32% NaOH solution and pure water are pumped in, the neutralization temperature is controlled at 40-45° C., and the neutralization time is 1-3 hours.
2. The preparation method according to claim 1, characterized in that: In S1, after the liquid sulfur enters the sulfur burning furnace, the air in the furnace is first heated to 250-280°C and then ignited.
3. The preparation method according to claim 1, characterized in that: In S1, the interior of the conversion tower is filled with a vanadium pentoxide bed.
4. The preparation method according to claim 1, characterized in that: In S1, the temperature of the sulfur trioxide gas is 250-280°C.
5. The preparation method according to claim 1, characterized in that: In S2, the parameters of the pure air are: air dew point -90 to -60°C, and water content at the ppm level.
6. The preparation method according to claim 1, characterized in that: In S2, the temperature is lowered to 50-60°C.
7. The preparation method according to claim 1, characterized in that: By controlling the weight ratio of 32% NaOH solution to pure water to 1:2.55-2.59, a surfactant with an active matter content of 50% is obtained.
8. The preparation method according to claim 1, characterized in that: By controlling the weight ratio of 32% NaOH solution to pure water to 1:0.34-0.38, a surfactant with an active matter content of 75% is obtained.
9. A surfactant, characterized in that The preparation method is described in any one of claims 1 to 8.
10. Use of the surfactant according to claim 9 in the field of textile printing and dyeing.