WO2016091149A1 - 一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法 - Google Patents

一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法 Download PDF

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WO2016091149A1
WO2016091149A1 PCT/CN2015/096648 CN2015096648W WO2016091149A1 WO 2016091149 A1 WO2016091149 A1 WO 2016091149A1 CN 2015096648 W CN2015096648 W CN 2015096648W WO 2016091149 A1 WO2016091149 A1 WO 2016091149A1
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calcium
sodium
alkylbenzenesulfonate
alkylbenzene sulfonate
reaction
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冯涛
翟月奎
于军
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Petrochina Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
    • C07C303/32—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of salts of sulfonic acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/28—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C309/29—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings
    • C07C309/30—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings of six-membered aromatic rings substituted by alkyl groups
    • C07C309/31—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings of six-membered aromatic rings substituted by alkyl groups by alkyl groups containing at least three carbon atoms

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  • the invention provides a method for converting calcium alkylbenzenesulfonate into sodium alkylbenzenesulfonate, which belongs to the technical field of preparation of sodium alkylbenzenesulfonate.
  • Detergent is a commonly used additive in lubricating oil products. It is a kind of spherical substance composed of surfactant and its encapsulated inorganic salt. It is divided into sulfonate and sulfurized alkylphenolate according to the type of surfactant. And salicylate detergent, wherein the sulfonate detergent is the most commonly used and the largest amount of detergent.
  • the surfactant in the detergent has a great influence on the performance of the lubricating oil product, especially in the marine lubricating oil product, the surfactant part in the sulfonate detergent determines the rust resistance, anti-emulsification performance and the fraction of the product. Water performance.
  • the analysis of the surfactant portion of the sulfonate detergent has methods such as infrared method, nuclear magnetic method, and ultraviolet method.
  • mass spectrometry has also been used for analysis, but mass spectrometry generally requires that the surfactant not contain other metal ions other than sodium to prevent contamination of the mass spectrum. Therefore, mass spectrometry requires treatment of the alkyl sulfonate detergent to partially convert the calcium alkylbenzene sulfonate to sodium alkylbenzene sulfonate.
  • an object of the present invention is to provide a method for converting calcium alkylbenzenesulfonate into sodium alkylbenzenesulfonate, which can effectively treat a surfactant of a sulfonate detergent. Meet the mass spectrometry conditions.
  • the present invention provides a method for converting calcium alkylbenzenesulfonate to sodium alkylbenzenesulfonate, comprising the steps of:
  • the reaction time for introducing the CO 2 gas is controlled to 2-3 hours, and the reaction time is counted from the start of introduction of CO 2 .
  • the operation of evaporating the solvent in the filtrate is carried out by rotary evaporation under the conditions of a vacuum of 80 to 300 Pa and an oil bath temperature of 70 to 85 °C.
  • the alkyl group of the calcium alkylbenzenesulfonate is a C 16 - C 30 alkyl group.
  • C 16 -C 30 alkyl benzene sulfonate is often used in the preparation of a calcium detergent lubricating oil, the calcium detergent to the C 16 -C 30 alkylbenzene sulfonic acid is converted to sodium alkylbenzenesulfonate, is required
  • the reaction activity of calcium C 16 -C 30 alkylbenzenesulfonate is mainly considered (due to the longer alkyl chain, the water solubility becomes poor, so that its reactivity in an aqueous solution is low).
  • the solution provided by the invention solves the problem of the reactivity of the calcium salt of C 16 -C 30 alkylbenzenesulfonate by using the method of passing CO 2 into the sodium hydroxide solution (the method of adopting CO 2 is effective, and the reaction with other reactions is effectively increased. The chance of contact with the object, thus allowing the reaction to continue until the reaction is complete).
  • the sodium hydroxide solution has a mass concentration of 10% to 30%.
  • the flow rate of the CO 2 gas is controlled to be 10 to 30 mL/min.
  • the filtration treatment is carried out using a filter membrane having a pore diameter of 4 to 12 ⁇ m.
  • the calcium benzenesulfonate used may be either synthetic benzenesulfonate or calcium petroleum benzenesulfonate.
  • the conversion method provided by the invention is helpful for converting calcium alkylbenzenesulfonate into sodium alkylbenzenesulfonate, and by adding calcium alkylbenzenesulfonate solid to sodium hydroxide solution, the mutual mutual benefit is facilitated Solubility; by introducing carbon dioxide gas into a sodium hydroxide solution under a certain temperature condition, the formation of calcium carbonate can be promoted, and it can be precipitated in a solution in the form of particles, which can effectively make calcium.
  • the ions are separated from the target product; rotary evaporation of the filtered solution can quickly yield a pure sodium alkylbenzene sulfonate solid.
  • the present invention is a method using NaOH and CO 2 , and the principle of the two is similar, but the reactants are faced, compared with the method of converting calcium benzenesulfonate to sodium benzenesulfonate using Na 2 CO 3 .
  • the methods required are quite different.
  • the Na 2 CO 3 conversion process has almost no effect on the conversion of calcium alkylbenzenesulfonate, and the method of using the NaOH and CO 2 of the present invention enables the in situ generation of CO 3 2- to greatly improve the conversion efficiency.
  • the method provided by the invention has the following advantages:
  • the method of the invention has wide application range, and is suitable for the conversion of synthetic calcium benzenesulfonate and the conversion of calcium petroleum benzenesulfonate.
  • the method of the invention has simple process and is easy to operate, and does not introduce other organicization in the whole process.
  • the impurity of the compound ensures the purity of sodium alkylbenzene sulfonate after conversion.
  • the method of the present invention employs a low-cost sodium hydroxide and carbon dioxide material, and only generates calcium carbonate and water after the reaction, facilitating the separation and purification of the sodium alkylbenzenesulfonate product.
  • Treatment with sodium hydroxide does not introduce other metal elements, which is beneficial for mass spectrometry for further analysis.
  • sodium hydroxide has a high reactivity, and therefore, the reaction time is relatively short.
  • the solid sodium benzene sulfonate obtained by the method of the present invention can be directly configured to perform mass spectrometry analysis, and has the characteristics of being quick and simple.
  • the sulfonate detergent surfactant can be treated by the method of the invention to reduce the calcium ion content to below 50 ppm, which satisfies the conditions of mass spectrometry.
  • Figure 1 is a mass spectrum of the product sodium alkylbenzenesulfonate in Example 1;
  • Example 2 is a mass spectrum of the product sodium alkylbenzenesulfonate in Example 2.
  • This embodiment provides a method for converting calcium alkylbenzenesulfonate to sodium alkylbenzenesulfonate, comprising the following steps:
  • a 500 mL single-mouth flask was placed in a water bath equipped with a magnetic stirrer and a heating function, and 0.7 mL of a 30% sodium hydroxide solution and 2.38 g of a calcium alkylbenzenesulfonate were sequentially added to a single-necked flask.
  • Calcium benzenesulfonate is a mixture having an alkyl chain length of C 16 - C 30 (the molecular weight of C 26 is taken as the average molecular weight of the alkylbenzene sulfonate, and the molar mass is 544.39 g/mol), and stirring is carried out at 10 mL/ The speed of min is introduced into the single-necked flask with carbon dioxide gas, and the reaction temperature is controlled to 30 ° C;
  • the raw materials and products were tested by the method of Chinese national standard GB/T 17476-1998.
  • the raw material of the raw material alkyl benzene sulfonate of the present example was determined to have a sodium content of 3940 ppm and a calcium content of 10220 ppm, and the obtained alkylbenzene was obtained.
  • Sulfur Sodium has a sodium content of 450 ppm and a calcium content of 23 ppm.
  • This embodiment provides a method for converting calcium alkylbenzenesulfonate to sodium alkylbenzenesulfonate, comprising the following steps:
  • Calcium sulfonate is a mixture having an alkyl chain length of C 16 - C 30 (the molecular weight of C 26 is taken as the average molecular weight of the calcium alkylbenzenesulfonate, and the molar mass is 544.39 g/mol), and stirring is started at 30 mL/ The speed of min is introduced into the single-necked flask with carbon dioxide gas, and the reaction temperature is controlled to be 60 ° C;
  • the mass spectrum of the sodium alkylbenzene sulfonate is shown in Figure 2.
  • the raw materials and products were tested by the method of Chinese national standard GB/T 17476-1998.
  • the raw material of the raw material alkyl benzenesulfonate of the present example was determined to have a sodium content of 4100 ppm and a calcium content of 11030 ppm.
  • the sodium sulfonate had a sodium content of 580 ppm and a calcium content of 30 ppm.
  • This embodiment provides a method for converting calcium alkylbenzenesulfonate to sodium alkylbenzenesulfonate, comprising the following steps:
  • Calcium sulfonate is a mixture having an alkyl chain length of C 16 - C 30 (the molecular weight of C 26 is taken as the average molecular weight of the calcium alkylbenzenesulfonate, and the molar mass is 544.39 g/mol), and stirring is started at 15 mL/ The speed of min is passed through carbon dioxide gas, and the reaction temperature is controlled to 50 ° C;
  • the raw materials and products were tested by the method of Chinese national standard GB/T 17476-1998.
  • the raw material of the raw material alkyl benzenesulfonate of the present example was determined to have a sodium content of 4120 ppm and a calcium content of 13010 ppm.
  • the sodium sulfonate had a sodium content of 600 ppm and a calcium content of 25 ppm.
  • This comparative example provides an experiment for treating calcium alkylbenzene sulfonate using a sodium carbonate method, and specifically includes the following steps:
  • a 500 mL single-mouth flask was placed in a water bath with a magnetic stirrer and a heating function, and 0.76 mL of a sodium carbonate sodium solution having a concentration of 30% and 1.3 g of calcium alkylbenzenesulfonate were added to a single-necked flask.
  • Calcium sulfonate is a mixture having an alkyl chain length of C 16 -C 30 (the molecular weight of C 26 is taken as the average molecular weight of the calcium alkylbenzenesulfonate, and the molar mass is 544.39 g/mol), and stirring is started to control the reaction temperature. It is 50 °C.
  • the method provided by the present invention can convert the calcium alkylbenzenesulfonate into sodium alkylbenzenesulfonate, and the calcium content after conversion is less than 50 ppm, which satisfies the requirements of mass spectrometry.
  • the method is fast and effective, and can be used as a quick method for the analysis and detection of the detergent surfactant.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Lubricants (AREA)

Abstract

本发明提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法。该方法包括以下步骤：将烷基苯磺酸钙分散于氢氧化钠溶液中，烷基苯磺酸钙与氢氧化钠的摩尔比为1:1.2-2.5，将溶液加热至30-60℃，搅拌条件下，向溶液中通入CO2气体，当pH值为7-8时，停止反应，得到反应液，反应液冷却后进行过滤处理，除去沉淀物，得到滤液，蒸除滤液中的溶剂，得到烷基苯磺酸钠。本发明所提供的方法操作简单，除钙效率高，有利于后续对此类烷基苯磺酸盐的分析。

Description

一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法 技术领域
本发明提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，属于烷基苯磺酸钠制备技术领域。
背景技术
清净剂是润滑油产品里一种常用添加剂，其是由表面活性剂及其包裹的无机盐所组成的一类球状物质，按其表面活性剂类型不同分为磺酸盐、硫化烷基酚盐及水杨酸盐清净剂，其中，磺酸盐清净剂是最常用、用量最大的一类清净剂。
清净剂中的表面活性剂对润滑油产品的性能影响非常大，特别是在船用润滑油产品中，磺酸盐清净剂中的表面活性剂部分决定了产品的抗锈蚀性能，抗乳化性能及分水性能。
目前，对磺酸盐清净剂的表面活性剂部分的分析有红外法、核磁法、紫外法等方法。近年来也见用质谱进行分析，但质谱分析通常要求表面活性剂中不含有除钠以外的其它金属离子，以防止对质谱的污染。因此，采用质谱分析需要先对烷基磺酸盐清净剂进行处理，将烷基苯磺酸钙部分转换成烷基苯磺酸钠。现有的处理方法，如加入碳酸钠进行沉淀的方法，由于清净剂中的表面活性剂部分的特殊性，使其并不能较好的与溶液中的碳酸根进行结合生成碳酸钙沉淀，因此并不能有效去除烷基苯磺酸钙中的钙；而使用阳离子交换树脂的方法，经过长时间处理也不能有效将钙离子去除。
发明内容
为解决上述技术问题，本发明的目的在于提供一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，该方法能有效地对磺酸盐清净剂的表面活性剂进行处理，满足质谱分析条件。
为达到上述目的，本发明提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，包括以下步骤：
将烷基苯磺酸钙分散于氢氧化钠溶液中，烷基苯磺酸钙与氢氧化钠的摩尔比为1:1.2-2.5，将溶液加热至30-60℃，搅拌条件下，向溶液中通入CO2气体；
当pH值为7-8时，停止反应，得到反应液；
反应液冷却后，进行过滤处理，除去沉淀物，得到滤液，蒸除滤液中的溶剂，得到烷基苯磺酸钠。
在上述制备方法中，优选地，通入CO2气体的反应时间控制为2-3小时，反应时间从开始通入CO2计起。
在上述制备方法中，优选地，蒸除滤液中的溶剂的操作是在真空度为80-300Pa、油浴温度70-85℃的条件下进行旋转蒸发。
在上述制备方法中，优选地，烷基苯磺酸钙的烷基为C16-C30的烷基。C16-C30烷基苯磺酸钙常被用于制备润滑油清净剂，若要将清净剂中的C16-C30烷基苯磺酸钙转化为烷基苯磺酸钠，则需要重点考虑C16-C30烷基苯磺酸钙的反应活性(由于较长的烷基链，水溶性变得较差，因此使其在水溶液中的反应活性较低)。本发明提供的方案，使用向氢氧化钠溶液中通CO2的方法，解决了C16-C30烷基苯磺酸钙的反应活性问题(采取通CO2的方式，有效增加了与其他反应物的接触机会，因此能使反应持续进行，直至反应完全)。
在上述制备方法中，优选地，氢氧化钠溶液的质量浓度为10％-30％。
在上述制备方法中，优选地，CO2气体的流量控制在10-30mL/min。
在上述制备方法中，优选地，过滤处理采用滤膜进行，所采用的滤膜的孔径为4-12μm。
在上述制备方法中，所使用的苯磺酸钙既可以是合成苯磺酸钙也可以是石油苯磺酸钙。
本发明提供的转化方法有助于将烷基苯磺酸钙转化为烷基苯磺酸钠，通过将烷基苯磺酸钙固体加入到氢氧化钠溶液中，有利于两者之间的相互溶解性；通过在一定的温度条件下，向氢氧化钠溶液中通入二氧化碳气体能够促进碳酸钙的生成，并使其以颗粒的形式在溶液中析出，对其进行过滤就能有效地使钙离子与目标产物分离；将过滤后的溶液进行旋转蒸发能够快速地得到较纯净的烷基苯磺酸钠固体。
同时，本发明是使用NaOH和CO2的方法，与使用Na2CO3将苯磺酸钙转化为苯磺酸钠的方法相比，二者的原理虽然看似一样，但因所面临反应物不同，所需要的方法有较大差异。Na2CO3转化法对烷基苯磺酸钙转化几乎不起任何作用，而使用本发明的NaOH和CO2的方法能够在原位生成CO3 2-对转化效率有极大提升。
与现有技术相比，本发明所提供的方法具备以下优点：
1、本发明的方法应用范围较广泛，既适合对合成苯磺酸钙进行转化，也适合对石油苯磺酸钙进行转化。
2、本发明的方法工艺处理比较简单，便于操作，整个工艺过程不引入其它有机化 合物杂质，保证了转化后烷基苯磺酸钠的纯度。
3、本发明的方法采用了低成本的氢氧化钠与二氧化碳材料，且反应后仅生成碳酸钙和水，易于烷基苯磺酸钠产品的分离和纯化。采用氢氧化钠处理不会引入其它金属元素，有利于质谱进行下一步分析。而且，氢氧化钠反应活性较高，因此，反应时间比较短。
4、采用本发明的方法转化后得到的固体苯磺酸钠可直接配置溶液进行质谱分析，具备快捷、简单的特点。
5、利用本发明的方法可实现对磺酸盐清净剂表面活性剂进行处理，使其钙离子含量降低至50ppm以下，满足质谱分析条件。
附图说明
图1为实施例1中的产物烷基苯磺酸钠的质谱图；
图2为实施例2中的产物烷基苯磺酸钠的质谱图。
具体实施方式
为了对本发明的技术特征、目的和有益效果有更加清楚的理解，现对本发明的技术方案进行以下详细说明，但不能理解为对本发明的可实施范围的限定。
实施例1
本实施例提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，包括以下步骤：
在带有磁力搅拌器及加热功能的水浴锅内放置500mL的单口烧瓶，依次将浓度为30％的氢氧化钠溶液0.7mL和烷基苯磺酸钙2.38g加入到单口烧瓶中，此烷基苯磺酸钙为混合物，其烷基链长为C16-C30(取C26的分子量作为该烷基苯磺酸钙平均分子量，摩尔质量为544.39g/mol)，开启搅拌并以10mL/min的速度向单口烧瓶内通入二氧化碳气体，控制反应温度为30℃；
保持反应3小时，可见反应溶液内有沉淀析出，测试溶液pH为8，停止反应；
冷却后使用4微米滤膜进行过滤，收集滤液，将其置于BUCHI-R-215设备中，调整设备的真空度为80Pa，油浴温度为70℃，进行旋转蒸发，除掉溶液，得到烷基苯磺酸钠固体。
该烷基苯磺酸钠的质谱图如图1所示。从图1可以看出，该烷基苯磺酸钠主要为C16(M＝441.0991)烷基链，同时有少部分C26(M＝543.0159)的苯磺酸钠。
采用中国国家标准GB/T 17476-1998的方法对原料和产物进行检测，经测定，本实施例的原料烷基苯磺酸钙的钠含量为3940ppm，钙含量为10220ppm，制得的烷基苯磺 酸钠的钠含量为450ppm，钙含量为23ppm。
同时，使用碳酸钠沉淀和阳离子交换树脂法对本实施例的原料进行处理，并检测得到的产物中的钠含量及钙含量，具体数据见表1。
实施例2
本实施例提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，包括以下步骤：
在带有磁力搅拌器及加热功能的水浴锅内放置500mL的单口烧瓶，将浓度为10％的氢氧化钠溶液1.2mL和烷基苯磺酸钙0.65g加入到单口烧瓶中，此烷基苯磺酸钙为混合物，其烷基链长为C16-C30(取C26的分子量作为该烷基苯磺酸钙的平均分子量，摩尔质量为544.39g/mol)，开启搅拌并以30mL/min的速度向单口烧瓶内通入二氧化碳气体，控制反应温度为60℃；
保持反应2小时，可见反应溶液内有沉淀析出，测试溶液pH为7，停止反应；
冷却后使用8微米滤膜进行过滤，收集滤液，将其置于BUCHI-R-215设备中，调整设备真空度为300Pa，油浴温度为85℃，进行旋转蒸发，除掉溶液，得到烷基苯磺酸钠固体。
该烷基苯磺酸钠的质谱图如图2所示。从图2可以看出，该烷基苯磺酸钠为C19(M＝483.0660)和C21(M＝511.0891)为主，同时还有C16(M＝441.0898)的苯磺酸钠。
采用中国国家标准GB/T 17476-1998的方法对原料和产物进行检测，经测定，本实施例的原料烷基苯磺酸钙的钠含量为4100ppm，钙含量为11030ppm，制得的烷基苯磺酸钠的钠含量为580ppm，钙含量为30ppm。
同时，使用碳酸钠沉淀和阳离子交换树脂法对本实施例的原料进行处理，并检测得到的产物中的钠含量及钙含量，具体数据见表1。
实施例3
本实施例提供了一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，包括以下步骤：
在带有磁力搅拌器及加热功能的水浴锅内放置500mL的单口烧瓶，将浓度为25％的氢氧化钠溶液0.76mL和烷基苯磺酸钙1.3g加入到单口烧瓶中，此烷基苯磺酸钙为混合物，其烷基链长为C16-C30(取C26的分子量作为该烷基苯磺酸钙的平均分子量，摩尔质量为544.39g/mol)，开启搅拌并以15mL/min的速度通入二氧化碳气体，控制反应温度为50℃；
保持反应2.5小时，可见反应溶液内有沉淀析出，测试溶液pH为8，停止反应；
冷却后使用10微米滤膜进行过滤，收集滤液，将其置于BUCHI-R-215设备中，调 整设备真空度为180Pa，油浴温度为80℃，进行旋转蒸发，除掉溶剂，得到烷基苯磺酸钠固体。
采用中国国家标准GB/T 17476-1998的方法对原料和产物进行检测，经测定，本实施例的原料烷基苯磺酸钙的钠含量为4120ppm，钙含量为13010ppm，制得的烷基苯磺酸钠的钠含量为600ppm，钙含量为25ppm。
对比例1
本对比例提供了使用碳酸钠方法处理烷基苯磺酸钙的实验，具体包括以下步骤：
在带有磁力搅拌器及加热功能的水浴锅内放置500mL的单口烧瓶，将浓度为30％的碳酸钠钠溶液0.76mL和烷基苯磺酸钙1.3g加入到单口烧瓶中，此烷基苯磺酸钙为混合物，其烷基链长为C16-C30(取C26的分子量作为该烷基苯磺酸钙的平均分子量，摩尔质量为544.39g/mol)，开启搅拌，控制反应温度为50℃。
可以观察到固体状态的烷基苯磺酸钙在碳酸钠溶液中不溶解，导致反应进行缓慢。持续反应后3小时，停止反应。
冷却后使用10微米滤膜进行过滤，收集滤液，将其置于BUCHI-R-215设备中，调整设备真空度为180Pa，油浴温度为80℃，进行旋转蒸发，除掉溶剂，得到白色固体，经检测，大部分为碳酸钠固体，而原料烷基苯磺酸钙则被过滤出来留在滤饼上。
表1 钙含量及钠含量测试结果
Figure PCTCN2015096648-appb-000001
根据上述实施例可以看出，本发明所提供的方法能够将烷基苯磺酸钙有较的转化为烷基苯磺酸钠，且转化后钙含量低于50ppm，满足质谱检测要求。该方法快捷有效，能够作为清净剂表面活性剂部分分析检测的快捷方法。

Claims (8)

  1. 一种将烷基苯磺酸钙转化为烷基苯磺酸钠的方法，包括以下步骤：
    将烷基苯磺酸钙分散于氢氧化钠溶液中，烷基苯磺酸钙与氢氧化钠的摩尔比为1:1.2-2.5，将溶液加热至30-60℃，搅拌条件下，向溶液中通入CO2气体进行反应；
    当pH值为7-8时，停止反应，得到反应液；
    反应液冷却后，进行过滤处理，除去沉淀物，得到滤液，蒸除滤液中的溶剂，得到烷基苯磺酸钠。
  2. 如权利要求1所述的方法，其中，通入CO2气体的反应时间控制为2-3小时。
  3. 如权利要求1所述的方法，其中，所述蒸除滤液中的溶剂的操作是在真空度为80-300Pa、油浴温度70-85℃的条件下进行旋转蒸发。
  4. 如权利要求1所述的方法，其中，所述烷基苯磺酸钙的烷基为C16-C30的烷基。
  5. 如权利要求1所述的方法，其中，所述氢氧化钠溶液的质量浓度为10％-30％。
  6. 如权利要求1所述的方法，其中，所述通入CO2气体的流量控制在10-30mL/min。
  7. 如权利要求1所述的方法，其中，所述过滤处理采用滤膜进行，所采用的滤膜的孔径为4-12μm。
  8. 如权利要求1-7任一项所述的方法，其中，所述烷基苯磺酸钙为合成苯磺酸钙或石油苯磺酸钙。
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