Sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate and production process thereof

Abstract

The invention provides a sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate and a production process of the sulfonator, relates to a novel falling film sulfonator, and belongs to the technical field of manufacturing of reaction devices for producing anionic surfactants by sulfating gas SO3. The invention provides a novel falling film sulfonator capable of being used for producing fatty alcohol polyoxyethylene ether sodium sulfate with ultralow dioxane content, the sulfonator improves the structure of a reaction tube, and a separation layer is formed between SO3 diluted gas and an organic material liquid film by introducing a balance wind concept, so that the content of the dioxane in the organic material liquid film is reduced, and the content of the dioxane in the organic material liquid film is reduced. According to the falling-film sulfonation tube, the sharp temperature interval at the upper part of the falling-film reactor tends to be mild, and the sulfonation / sulfation reaction rate in the length of the whole falling-film sulfonation tube tends to be balanced, so that the output of dioxane is reduced, the product quality is improved, the subsequent post-treatment of AES products is avoided, and the production energy consumption is reduced; the device is easy to operate and has certain practicability.

Description

Technical Field

[0001] The invention relates to a novel falling film sulfonator, belonging to the technical field of manufacturing reaction devices for producing anionic surfactants by gas SO3 or sulfation, and in particular to a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate and a production process thereof. Background Art

[0002] Sodium fatty alcohol polyoxyethylene ether sulfate is obtained from fatty alcohol as raw material through epoxide addition, sulfation, neutralization and other processes. It has excellent foaming, detergency, emulsification and hard water resistance properties. It is an important anionic surfactant and is widely used in human contact cleaning products.

[0003] Sulfonation / sulfation reaction (collectively referred to as sulfonation reaction) is the main chemical method used in the industrial production of pigments, dyes, pesticides and organic intermediates, and has been widely studied both at home and abroad. By using different sulfonating agents to introduce (-SO3) groups into organic molecules, the organic molecules are given a (-CS(O2)OX) structure, and a variety of products are obtained, including sulfonic acid (X=H), sulfate (X=M, M is a metal cation), sulfonyl halide (X is a halogen), etc., and the organic molecules have a variety of surface activities such as emulsification, foaming, and wetting; at the same time, the hydrolyzability of the (-CS(O2)OX) group is used to give the organic molecules better water solubility; selective sulfonation is used in the field of pharmaceutical production to separate isomers and obtain a series of intermediates. However, the most important application of sulfonation reaction in industry is still in the field of anionic surfactants.

[0004] The sulfur trioxide gas sulfonation unit is a production unit for producing anionic surfactants. However, in the process of producing fatty alcohol polyoxyethylene ether sodium sulfate products, by-products will be generated. Due to the presence of polyethylene glycol and water in the raw material fatty alcohol polyoxyethylene ether, a certain amount of dioxane will be produced during sulfation. The generation of dioxane is an important side reaction. 1,4-dioxane is also known as dioxane, which has a ring structure and a molecular formula of C4H8O2. It is a colorless liquid and is slightly toxic. It is formed by the chemical cracking of two molecules of ethylene oxide in the raw material fatty alcohol polyoxyethylene ether. It is an undesirable by-product. With the change of raw material quality and sulfation / neutralization process conditions, the dioxane content can vary from trace amounts to hundreds or even thousands of ppm (mg / kg). Dioxane has anesthetic and irritating effects after inhalation, ingestion or entering the human body through the skin, and will accumulate in the body.

[0005] At present, the industrial production of anionic surfactants mainly uses falling film sulfonators, whose structure is mainly vertical reaction tubes arranged in a shell. The main process is that SO3 is diluted to a certain concentration by air and enters through the SO3 gas nozzle inlet at the top of the reactor. The organic material enters the reaction tube from the organic material delivery pump through the organic material inlet, forming a thin layer of organic liquid film on the inner wall of the tube, flowing downward from the top of the tube, and flowing downward with the SO3 dilution gas. The two come into contact and react quickly, releasing a large amount of reaction heat. From the simulation curve of the relationship between the conversion rate of the falling film reactor and the height of the reactor, it can be seen that the organic material and SO3 gas contact within the first 0.3m of the reactor length, and the conversion rate reaches 20%. From the top of the reactor, 1m down, the conversion rate has exceeded 50%, and from the top down 2m, a conversion rate of 75% can be obtained. Similarly, according to the simulation curves of reactor height, material viscosity and liquid film thickness, it can be seen that the material viscosity increases with the increase of reactor length. The increase in viscosity further affects the thickness of the liquid film, which in turn leads to the accumulation of reaction heat. The heat that cannot be transferred quickly will cause the temperature of the reaction liquid and gas to rise rapidly, thereby affecting the quality of the sulfation reaction product, which is manifested as a rapid increase in the dioxane content in the product.

[0006] At present, if the dioxane content of fatty alcohol polyoxyethylene ether sulfate (AES) is high, it is necessary to reduce the dioxane content through post-treatment to meet the product use standards. Usually, vacuum degassing, steam stripping and other methods are used, that is, vacuum, high heat and other methods are used to remove moisture from the product to take away the dioxane dissolved in water. This method can reduce the dioxane content to less than 10ppm, but it consumes a lot of additional energy and increases production costs. Summary of the invention

[0007] The object of the present invention is to overcome the shortcomings of the above-mentioned background technology. The present invention provides a sulfonator for preparing sodium sulfate of fatty alcohol polyoxyethylene ether and a production process thereof. Specifically, a new falling film sulfonator for producing sodium sulfate of fatty alcohol polyoxyethylene ether with ultra-low dioxane content is provided. The sulfonator improves the structure of the reaction tube, and by introducing the concept of balanced wind, a separation layer is formed between the SO3 dilution gas and the organic liquid film, so that the sharp temperature range at the top of the falling film reactor tends to be relaxed, and the sulfonation / sulfation reaction rate within the entire reactor length tends to be balanced, thereby reducing the amount of dioxane produced, improving the quality of the product, avoiding the subsequent post-processing of the AES product, and reducing production energy consumption. The device of the present invention is simple to operate and has certain practicality.

[0008] In the first aspect, the present application provides a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate:

[0009] A sulfonator for preparing sodium sulfate of fatty alcohol polyoxyethylene ether, comprising an SO3 dilution gas inlet, a reactor main shell and a finished product outlet;

[0010] The main shell of the reactor includes an air duct connected to the SO3 dilution gas inlet, a balance air inlet, an organic material inlet, a falling film sulfonation pipe and a circulating cooling system;

[0011] The SO3 dilution gas inlet is arranged at the top of the reactor main shell and is connected to the air duct. The air duct and the falling film sulfonation tube are arranged inside the reactor main shell and are connected to each other. The balance air inlet is connected to the air duct, the organic material inlet is connected to the falling film sulfonation tube, and the finished product outlet is located at the lower end of the reactor main shell and is connected to the falling film sulfonation tube.

[0012] The circulating cooling system is used for cooling the falling film sulfonation tube.

[0013] After the diluted sulfur trioxide gas enters the gas feed chamber from the SO3 dilution gas inlet, it enters each individual air duct through the gas nozzle above the annular gap; the organic material passes through the feed ports distributed around the reactor and forms an organic liquid film along the inner wall of the falling film sulfonation tube in the annular gap around the falling film sulfonation tube, flowing from the top to the bottom; there is also a balance air chamber between the SO3 dilution gas air duct and the organic material feed chamber, and the balance air chamber is fed with dry process air, which is regarded as balance air. All falling film sulfonation tubes are vertically distributed in the main shell of the sulfonation reactor, and there is a circulating cooling system (such as cooling water) between each falling film sulfonation tube to remove the reaction heat.

[0014] The gas nozzle is inserted into the dilution air duct of the balance air chamber; the dilution air duct in the balance air chamber is inserted into the upper part of the falling film sulfonation tube; the overall structure of the balance air chamber is connected to the organic material distributor through a flange.

[0015] As a preferred embodiment of the present invention, the reaction balance air volume and the total amount used to dilute the SO3 gas are consistent with the total amount of dry air used in the process when there is no balance wind.

[0016] Furthermore, the balance air inlet surrounds the air duct and is connected to the air duct through an annular gap; the organic material inlet surrounds the falling film sulfonation tube and is connected to the falling film sulfonation tube through an annular gap.

[0017] Furthermore, the height difference between the connecting point between the balance air inlet and the air duct and the connecting point between the organic material inlet and the falling film sulfonation pipe is controlled to be 0.25-0.5m.

[0018] Furthermore, the circulating cooling system is circulating cooling water, and the circulating cooling water is in contact with the falling film sulfonation tube to remove the reaction heat.

[0019] Furthermore, the falling film sulfonation tubes are vertically distributed in the main shell of the sulfonation reactor.

[0020] Furthermore, the reactor main shell also includes a gas nozzle, which is arranged above the air duct, and the SO3 dilution gas entering from the SO3 dilution gas inlet enters the air duct through the gas nozzle.

[0021] In a second aspect, the present application provides a production process for a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate:

[0022] The production process of the sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate is adopted as described in the present application.

[0023] Further, a production process of a sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate comprises the following steps:

[0024] S1: SO3 dilution gas enters the gas feed chamber from the SO3 dilution gas inlet, and enters a separate air duct through the gas nozzle above the annular gap; the balance air enters the air duct through the gap surrounding the air duct, and flows downward from the air duct together;

[0025] The organic material passes through the organic material inlet distributed around the falling film sulfonation tube, passes through the annular gap around the falling film sulfonation tube, and forms an organic liquid film along the inner wall of the falling film sulfonation tube, and flows from the top to the bottom; during the descending process of the organic material, the balance wind, and the SO3 dilution gas, the SO3 in the SO3 dilution gas gradually reacts with the organic material;

[0026] S2: The reactants of step S1 react in the falling film sulfonation tube (14) and fall due to gravity. The heat of reaction is taken away by the circulating cooling system (15). The reacted acid ester and reacted gas flow out from the finished product outlet (3) at the bottom of the reactor main shell (1).

[0027] Furthermore, in step (3), the acid ester flowing out from the bottom of the sulfonation reactor needs to be quickly neutralized after gas-liquid separation, and the pH value of the material after neutralization is controlled at 9-11.

[0028] Furthermore, the volume concentration of SO3 gas in the SO3 dilution gas entering the top of the sulfonation reactor is 5-8%; the volume concentration of SO3 gas after the SO3 dilution gas is mixed with the balance wind is 2.0-3.0%, and the flow rate of the balance wind is controlled at 20-30m / s.

[0029] Furthermore, the molar ratio of SO3 to organic material in the falling film sulfonation tube is 1.01 to 1.2:1.

[0030] Furthermore, the temperature of the circulating cooling system is 25-28°C.

[0031] Beneficial effects:

[0032] The present application provides a novel falling film sulfonator which can be used for producing fatty alcohol polyoxyethylene ether sodium sulfate with ultra-low dioxane content. The sulfonator improves the structure of the reaction tube and forms a separation layer between the SO3 dilution gas and the organic liquid film by introducing the concept of balanced wind, so that the sharp temperature range at the top of the falling film reactor tends to be relaxed, and the sulfonation / sulfation reaction rate within the entire length of the falling film sulfonation tube tends to be balanced, thereby reducing the amount of dioxane generated, improving the quality of the product, avoiding the subsequent post-treatment of the AES product, and reducing production energy consumption; the device of the present invention is simple to operate and has certain practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 , a schematic diagram of the structure of the sulfonator of the embodiment;

[0034] Figure 2 , schematic diagram of the balanced wind, SO3 dilution gas and organic material flowing into the sulfonator in the embodiment;

[0035] Figure 3 , schematic top view of the pipeline structure of the sulfonator in the embodiment;

[0036] Figure 4 , Schematic diagram of material distribution in the falling film sulfonation tube of the sulfonator of the embodiment.

[0037] Reference numerals:

[0038] 1. Reactor main shell; 2. SO3 dilution gas inlet; 3. Finished product outlet; 4. Gas nozzle; 5. Balanced wind chamber; 6. Organic material inlet distributor; 7. Gas feed chamber; 8. SO3 dilution gas; 9. Balanced wind; 10. Organic material; 11. Air duct; 12. Balanced wind inlet; 13. Organic material inlet; 14. Falling film sulfonation tube; 15. Circulating cooling system; 16. Circulating cooling medium inlet; 17. Circulating cooling medium outlet. DETAILED DESCRIPTION

[0039] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment, a production process of a sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate:

[0041] The sulfonator (height 6m) for preparing sodium sulfate of fatty alcohol polyoxyethylene ether is used in the present application, and the specific structure is as follows Figures 1 to 3 , the material distribution in the falling film sulfonation tube is as follows Figure 4 .

[0042] A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate comprises an SO3 dilution gas inlet 2, a reactor main shell 1 and a finished product outlet 3.

[0043] The reactor main shell 1 includes an air duct 11 , a balance air inlet 12 , an organic material inlet 13 , a falling film sulfonation tube 14 and a circulating cooling system 15 .

[0044] The SO3 dilution gas inlet 2 is arranged at the top of the reactor main shell 1 and is connected to the air duct 11. The air duct 11 and the falling film sulfonation tube 14 are arranged inside the reactor main shell 1 and are connected to each other. The balance air inlet 12 is connected to the air duct 11, the organic material inlet 13 is connected to the falling film sulfonation tube 14, and the finished product outlet 3 is located at the lower end of the reactor main shell 1 and is connected to the falling film sulfonation tube 14. The circulating cooling system 15 (specifically a cooling water system) is used to cool the falling film sulfonation tube 14.

[0045] After the diluted sulfur trioxide gas enters the gas feed chamber 7 from the SO3 dilution gas inlet 2, it enters each individual air duct 11 through the gas nozzle 4 above the annular gap; the organic material 10 passes through the annular gaps distributed around the falling film sulfonation tube 14 and forms an organic liquid film along the inner wall of the falling film sulfonation tube 14, and flows downward from the top. All the falling film sulfonation tubes 14 are vertically distributed in the main shell 1 of the sulfonation reactor, and there is circulating cooling water between each falling film sulfonation tube 14 to remove the reaction heat.

[0046] There is also a balancing wind chamber 9 between the SO3 dilution gas 8 air duct 11 and the organic material 10 feeding chamber. The feed of the balancing wind chamber is dry process air, which is regarded as the balancing wind 9.

[0047] The gas nozzle 4 is inserted into the air duct 11 of the balance air chamber; the air duct 11 in the balance air chamber is inserted into the upper part of the falling film sulfonation tube 14; the overall structure of the balance air chamber 5 is connected to the organic material inlet distributor 6 through a flange.

[0048] The amount of the balancing wind 9 and the total amount of the SO3 gas used to dilute it are consistent with the total amount of dry air used in the process when there is no balancing wind 9.

[0049] A production process for preparing sodium fatty alcohol polyoxyethylene ether sulfate by using a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate comprises the following steps:

[0050] S1: 250kg / h of liquid sulfur and 3500m 3 / h The process air with a dew point below -60℃ after freeze drying is fully burned in the sulfur-burning furnace to generate SO2 dilution gas, which is then catalytically oxidized into SO3 dilution gas 8 (volume concentration is 5-8%) through a conversion tower. The SO3 dilution gas 8 is cooled, diluted twice, and filtered to obtain a SO3 dilution gas 8 with a volume fraction of 7.1% (the SO3 dilution gas 8 of the sulfur-burning method occurs in a multi-stage sulfonation reactor), which enters the head of the sulfonation reactor; the SO3 dilution gas 8 enters the gas feed chamber 7 from the SO3 dilution gas inlet 2, and evenly enters the separate air duct 11 through the gas nozzle 4 above the annular gap, while the balance wind 9 is at 3725m3 / h of flow rate enters the air duct 11 through the gap surrounding the air duct 11 (balanced air inlet pipe DN250, flow rate 21m / s), and flows downward from the air duct 11. The volume fraction of SO3 in the gas after the SO3 dilution gas 8 and the balanced wind 9 merge is 2.4%. The insertion height of the air duct 11 in the balanced wind 9 room and the height difference with the feed port of the organic material 10 are controlled to be 0.4m.

[0051] By introducing the concept of balanced wind 9, a separation layer is formed between the SO3 dilution gas 8 and the liquid film of the organic material 10, so that the sharp temperature range at the top of the falling film reactor is relaxed, and the sulfonation / sulfation reaction rate within the entire length of the reactor is balanced, thereby reducing the amount of dioxane produced and improving the quality of the product.

[0052] 2160kg / h of fatty alcohol polyoxyethylene ether (AEO2) solution enters the organic material inlet distributor 6 through the organic material inlet 13 distributed around the falling film sulfonation tube 14 (the molar ratio of SO3 to the organic material 10 fatty alcohol polyoxyethylene ether (AEO2) is 1.02:1), and forms an organic liquid film along the inner wall of the falling film sulfonation tube 14 through the annular gap around the falling film sulfonation tube 14, flows from the top to the bottom, and is evenly distributed in the falling film sulfonation tube 14; the SO3 dilution gas 8 gradually diffuses to the periphery, contacts with the organic material 10 after being diluted by the balancing wind 9, and gradually begins to react; the organic material 10, the balancing wind 9, and the SO3 dilution gas 8 gradually contact and fully react during the descending process, and the reaction droplets fall along the inner wall of the falling film sulfonation tube 14.

[0053] The balancing wind 9 exerts a certain pressure on the liquid film of the organic material 10 on the inner wall of the falling film sulfonation tube 14, which helps to maintain the stability of the liquid film.

[0054] S2: The material in step S1 reacts in the falling film sulfonation tube 14 and falls with gravity. The reaction heat is taken away by the circulating cooling water (the inlet temperature of the circulating water is 25-28° C.). The acid ester and the gas after the reaction flow out from the finished product outlet 3 at the bottom of the sulfonation reactor, and are separated from the sulfonated gas by the gas-liquid separator and the cyclone separator. After neutralization (the pH value of the material after neutralization is controlled at 10), the AES obtained has the product detection indicators as shown in Table 1:

[0055] Table 1. Test indicators of AES products prepared in Example 1

[0056]

[0057] In a comparative example, a production process of a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate adopts an ordinary sulfonator (height 6m). The ordinary sulfonator is different from the sulfonator used in the embodiment in that a balancing air inlet is not provided.

[0058] The production process includes the following preparation steps:

[0059] S1: 250kg / h of liquid sulfur and 6940m 3 / h The process air with a dew point below -60℃ after freeze drying is fully burned in the sulfur burning furnace to generate SO2 dilution gas, which is then catalytically oxidized into SO3 dilution gas (volume concentration is 2.5%) through the conversion tower. The SO3 dilution gas is cooled, diluted twice, and filtered to obtain a SO3 dilution gas with a volume fraction of 2.4% (the SO3 dilution gas of the ordinary sulfur burning method occurs in the sulfonation reactor, and the total gas flow rate used is 7225m 3 / h) and enters the head of the sulfonation reactor; the SO3 diluted gas enters the gas feed chamber from the top of the sulfonation reactor and evenly enters the separate air duct through the gas nozzle above the annular gap.

[0060] 2160kg / h of AEO2 solution enters the liquid material distributor of the sulfonation reactor (the molar ratio of SO3 to organic material fatty alcohol polyoxyethylene ether is 1.02:1) through the organic material inlet distributed around the falling film reactor. After being evenly distributed, it fully contacts with the SO3 dilution gas in the falling film sulfonation tube and reacts. The reaction droplets fall along the inner wall of the sulfonation tube.

[0061] S2: The material of step S1 reacts in the falling film sulfonation tube 14 and falls with gravity. The reaction heat is taken away by the circulating cooling water (the inlet temperature of the circulating water is 25-28° C.). The acid ester and the gas after the reaction flow out from the bottom of the sulfonation reactor. After being separated from the sulfonation gas by the gas-liquid separator and the cyclone separator, the obtained acid ester is neutralized (the pH value of the material after neutralization is controlled at 10) to obtain the product AES. The product detection indicators are shown in Table 2:

[0062] Table 2. Test indicators of AES products prepared in comparative examples

[0063]

[0064] The active substance content detection method adopts the national standard GB / T 5173-2018, and the dioxane detection method adopts the gas chromatography method with internal standard. The examples and comparative examples are detected under the same conditions.

[0065] Comparison of the data in Table 1 and Table 2 shows that, when the raw material dosage is the same, the product AES prepared by the new sulfonator with a balanced air inlet in Example 1 has lower dioxane and higher product quality.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate, characterized in that: It includes a SO3 dilution gas inlet (2), a reactor main shell (1) and a finished product outlet (3); The reactor main shell (1) comprises an air duct (11), a balanced air inlet (12), an organic material inlet (13), a falling film sulfonation tube (14) and a circulating cooling system (15); The SO3 dilution gas inlet (2) is arranged at the top of the reactor main shell (1) and is connected to the air duct (11); the air duct (11) and the falling film sulfonation tube (14) are both arranged inside the reactor main shell (1) and are connected to each other; the balance air inlet (12) is connected to the air duct (11); the organic material inlet (13) is connected to the falling film sulfonation tube (14); the finished product outlet (3) is located at the lower end of the reactor main shell (1) and is connected to the falling film sulfonation tube (14); The circulating cooling system (15) is used to cool the falling film sulfonation tube (14).

2. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 1, characterized in that: The balance air inlet (12) surrounds the air duct (11) and is connected to the air duct (11) through an annular gap; the organic material inlet (13) surrounds the falling film sulfonation tube (14) and is connected to the falling film sulfonation tube (14) through an annular gap.

3. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 1, characterized in that: The height difference between the connecting point of the balance air inlet (12) and the air duct (11) and the connecting point of the organic material inlet (13) and the falling film sulfonation tube (14) is controlled to be 0.25-0.5m.

4. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 1, characterized in that: The circulating cooling system (15) comprises a circulating cooling medium, a circulating cooling medium inlet (16) and a circulating cooling medium outlet (17). The circulating cooling medium is in contact with the falling film sulfonation tube to remove the reaction heat.

5. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 4, characterized in that: The falling film sulfonation tubes (14) are vertically distributed in the main shell (1) of the sulfonation reactor.

6. A sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 1, characterized in that: The reactor main shell (1) further comprises a gas nozzle (4), wherein the gas nozzle (4) is arranged above the air duct (11), and the SO3 dilution gas (8) entering from the SO3 dilution gas inlet (2) enters the air duct (11) through the gas nozzle (4).

7. A production process for a sulfonator for preparing sodium fatty alcohol polyoxyethylene ether sulfate, characterized in that: A sulfonator for preparing fatty alcohol polyoxyethylene ether sodium sulfate is used according to any one of claims 1 to 6.

8. A production process for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 7, characterized in that: The following steps are involved: S1: SO3 dilution gas (8) enters the gas feed chamber (7) from the SO3 dilution gas inlet (2), and enters the separate air duct (11) through the gas nozzle (4) above the annular gap; the balancing air (9) enters the air duct (11) through the gap surrounding the air duct (11), and flows downward from the air duct (11) together; The organic material (10) passes through the organic material inlet (13) distributed around the falling film sulfonation tube (14), passes through the annular gap around the falling film sulfonation tube (14), and forms an organic liquid film along the inner wall of the falling film sulfonation tube (14), and flows downward from the top; during the descending process of the organic material (10), the balance wind (9), and the SO3 dilution gas (8), the SO3 in the SO3 dilution gas (8) gradually reacts with the organic material (10); S2: The reactants in step S1 react in the falling film sulfonation tube (14) and fall due to gravity. The reaction heat is taken away by the circulating cooling system (15). The reacted acid ester and the reacted gas flow out from the finished product outlet (3) at the bottom of the reactor main shell (1).

9. A production process for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 8, characterized in that: The SO3 volume fraction in the gas after the SO3 dilution gas (8) and the balance wind (9) merge is 2.0-3.0%, and the flow rate of the balance wind (9) is 20-30m / s; the organic material is a fatty alcohol polyoxyethylene ether solution.

10. A production process for preparing sodium fatty alcohol polyoxyethylene ether sulfate according to claim 8, characterized in that: The molar ratio of SO3 to the organic material (10) in the falling film sulfonation tube (14) is 1.01 to 1.2:1.

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