Method for removing sulfur trioxide in production of heavy alkyl benzene sulfonic acid

Abstract

The invention discloses a method for removing sulfur trioxide in production of heavy alkyl benzene sulfonic acid, which comprises a removal device and a removal method, and the removal device comprises a first removal unit and a second removal unit which are separated by a separation plate, the first removal unit and the second removal unit are sequentially provided with a feed liquid distribution chamber, a Pall ring packing layer and a liquid storage chamber from top to bottom, an air inlet pipe with a downward pipe orifice is arranged at the upper part in the liquid storage chamber, a flow meter is arranged on the air inlet pipe, the air inlet pipe is connected with a waste heat air pipeline, an exhaust pipe is arranged at the top of the feed liquid distribution chamber, and the exhaust pipe is connected with a tail gas pipeline. According to the invention, the waste hot air which is uniformly distributed upwards is in full contact with the heavy alkyl benzene sulfonic acid feed liquid which is uniformly distributed downwards, and unreacted sulfur trioxide in the feed liquid is blown to the tail gas pipeline through the exhaust pipe, so that excessive sulfur trioxide can be effectively removed, the content of sulfuric acid in the product is controlled, the average deacidification rate is 86.8%, the deacidification efficiency is high and stable, and the quality of the heavy alkyl benzene sulfonic acid can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of production of heavy alkylbenzene sulfonate, and relates to a method for removing sulfur trioxide in the production of heavy alkylbenzene sulfonic acid. Background technique [0002] Heavy alkylbenzene sulfonate has excellent performance in reducing oil-water interfacial tension, and is an important oil displacement surfactant in tertiary oil recovery. Industrial practice shows that it can also be made into high-grade lubricating oil additives and other industrial additives . However, in different application fields, the requirements for various indicators of the product are not the same, among which the content of sulfuric acid is one of the important reference indicators in different application fields. [0003] At present, sulfur trioxide membrane sulfonation method is one of the commonly used production processes for heavy alkylbenzene sulfonic acid. Due to the relatively complex composition of heavy ...

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Problems solved by technology

[0003] At present, sulfur trioxide membrane sulfonation method is one of the commonly used production processes for heavy alkylbenzene sulfonic acid. Due to the relatively complex composition of heavy alkylbenzene raw materials and the inherent defects of sulfur trioxide membrane sulfonation process, resulting in Excessive sulfur trioxide remains in the sulfonated product in the form of sulfuric acid, which affects the quality of heavy alkylbenzene sulfonate on the one hand, and on the other hand, when workers pack the product, the strong irritating acid gas seriously affects the packaging workers' health

[0004] In the industry, the separation process of adding water and phase is generally used to remove sulfuric acid, but the effect of this method is poor, and the water will remain in the product, which will affect the quality of the product.

In addition, there are also relevant technical personnel who use organic solvent liquid-liquid extraction, membrane dialysis-mass method, etc. to carry out operations such as removal of impurities of heavy alkylbenzene sulfonic acid, but they are all limited to laboratory analysis and application, literature (heavy alkyl Research on improving the quality of benzenesulfonic acid, Zhang Ling, Tao Duanjian, Zhao Min, etc., Chemical Industry Times, 2011 (25) 6) reported the direct removal of heavy alkyl benzenesulfonic acid by silica gel adsorption method and barium carbonate neutralization method Sulfuric acid in acid, using silica gel column chromatography to separate heavy alkylbenzenesulfonic acid and heavy alkylbenzene, to improve the quality of heavy alkylbenzenesulfonic acid, but this method also has certain limitations in the scale production application, and the The method will also bring more hazardous waste, and the environmental cost and economic cost are higher

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