Sulfur trioxide gas jet sulfonation process and device for bisalkyl benzene

Abstract

The invention discloses a sulfur trioxide gas injecting sulfonated technique of heavy alkylate benzene, which is characterized by the following: making composite gas of SO3 / air into gas sprayer of SO3 gas injecting sulfonated reactor between 55 and 75 deg.c with spraying speed at 50-300m / s; entering heavy alkylate benzene into the SO3 gas injecting sulfonated reactor between 5 and 50 deg.c; setting the molar rate of heavy alkylate benzene and SO3 at 1.0-1.5:1; reacting heavy alkylate benzene and composite gas of SO3 / air in the SO3 gas injecting sulfonated reactor for 1-5s; separating sulfonated product from non-reacted composite gas of SO3 / air; cooling liquid phase under 40-80deg.c for 30-120min; hydrolyzing; neutralizing to obtain the product.

Description

technical field [0001] The invention relates to a process and a device for preparing anionic surfactant heavy alkylbenzene sulfonate by sulfonating heavy alkylbenzene with sulfur trioxide gas. Background technique [0002] Heavy alkylbenzene (HAB) is a by-product in the process of producing alkylbenzene, a raw material for detergents. Alkylated naphthalene, diphenyl alkanes, and a small amount of polar substances, etc. Among them, indane, tetralin and alkylnaphthalene are very easy to sulfonate, but dialkylbenzene, polyalkylbenzene and other substances are difficult to sulfonate, and the sulfonated substances account for about 70% to 90%. [0003] Heavy alkylbenzene sulfonate has excellent properties of reducing crude oil / water interfacial tension, and is cheap and simple in preparation process. It is widely used in various fields of petroleum industry, such as: drilling, oil production, crude oil demulsification, refining, And it is the main surfactant used in three recov...

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Problems solved by technology

[0007] (1) The upper part of the membrane sulfonation reactor is easy to coke, which affects the uniform distribution of the liquid film on the inner wall of the membrane sulfonation reactor, thus making the quality of the sulfonation product unstable, especially in the ability to reduce the crude oil / water interfacial tension.

On the one hand, this is because the composition of heavy alkylbenzenes is relatively complex, and the sulfonation activity of different compositions is quite different, such as: dialkylbenzene, polyalkylbenzene and other substances are difficult to sulfonate, indane, tetralin and alkylnaphthalene It is very easy to sulfonate; on the other hand, because the temperature of the liquid film in the membrane sulfonation reactor reaches the peak at the upper part of the membrane sulfonation reactor, some of the easily sulfonated components in the heavy alkylbenzene have undergone side effects such as sulfonation and oxidation. reaction, even carbonization and coking

In addition, the residence time of the material in the membrane sulfonation reactor is relatively long

[0008] (2) The viscosity of heavy alkylbenzene and its sulfonated products is relatively high, and in SO 3 The liquid film in the lower half of the gas membrane sulfonation reactor is too thick, which affects the sulfonation rate and product quality

On the one hand, it affects the service life of the membrane sulfonation reactor, on the other hand, it increases the number of unqualified products and increases the production cost

[0010] Also, SO 3 The gas membrane sulfonation reactor also has disadvantages such as complex structure, high requirements for equipment processing, manufacturing precision and installation precision, high investment costs, small operating flexibility, strict process conditions, and unsuitable for frequent start-up and shutdown.

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