Production process of sodium dodecyl diphenyl ether disulfonate

Abstract

The invention relates to the technical field of surfactant production processes, in particular to a production process of sodium dodecyl diphenyl ether disulfonate, which is clean, environmentally friendly, good in effect, extremely high in sulfonation capacity, fast in sulfonation reaction and free of by-products. The process comprises the following steps: 1) adding metered new diphenyl ether andrecovered diphenyl ether into a reaction kettle, starting the reaction kettle for stirring, starting a vacuum pump, vacuumizing the reaction kettle, opening jacket steam of the reaction kettle, heating to 80-100 DEG C, and dehydrating; 2) stopping vacuum after diphenyl ether moisture content in the reaction kettle is qualified, adding a certain amount of a catalyst into the reaction kettle, and continuously stirring until the catalyst is completely dissolved, and 3) cooling to 50-70 DEG C, starting to dropwise add a certain amount of tetrapolypropylene, and continuously carrying out a reaction for 1-2 h after the dropwise addition is completed.

Description

technical field [0001] The technical field of the production technology of surfactant that the present invention relates to, particularly relate to a kind of production technology of sodium dodecyl diphenyl ether disulfonate. Background technique [0002] As we all know, surfactants, commonly known as "industrial monosodium glutamate", are a very important class of fine chemicals. In recent years, the surfactant industry has developed rapidly, the types and quantities of surfactants have increased dramatically, and the scope of application has continued to expand. However, some special applications (such as strong acid, strong alkali, high inorganic salt concentration, etc.) put forward higher requirements on the performance of surfactants, and most traditional surfactants cannot meet these requirements. Therefore, it is particularly important to develop functional surfactants with special chemical structures. [0003] Sodium dodecyl diphenyl ether disulfonate is an anioni...

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Problems solved by technology

Commonly used sulfonating agents include concentrated sulfuric acid, oleum, sulfur trioxide, chlorosulfonic acid and sulfite, etc. Among them, using concentrated sulfuric acid and oleum as sulfonating agents for sulfonation will produce a large amount of waste acid, seriously Pollution of the environment, with the advancement of technology and the country's increasing emphasis on environmental protection, this method will be gradually eliminated; using chlorosulfonic acid as a sulfonating agent will generate hydrogen chloride gas as a by-product, and the environmental protection pressure in the production process is also relatively high. Large, this method is only used in a small amount where the sulfonated substance is difficult to sulfonate; sulfite has a weak sulfonation ability, and is only suitable for substances that are easily sulfonated

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