Dry process of dodecyl sodium sulfate

Abstract

The invention provides a process for drying lauryl sodium sulfate, which belongs to the technical field of preparation of a surfactant in an organic compound. The method is carried out in a compound vacuum drier formed by a vacuum tube type spray drying part (A), an adapting tank (B) and a vacuum scraper drying part (C), and comprises the following steps: (1) preheating a lauryl sodium sulfate material in a preheater to the temperature of between 50 and 100 DEG C, and making the material be in a half atomized state and enter a vacuum drying tube with vapor in the vacuum tube type spray drying part (A) at a pressure of between 0.2 and 1.0MPa by a conveying pump, so that the moisture content of the material is reduced to 50 to 10 percent; (2) introducing the material into the vacuum scraper drying part (C) through the adapting tank (B) for secondary drying, so that the moisture content of the dried material is lower than 3 percent; and (3) according to the prior process, granulating the dried materials through a double screw extruder to manufacture an acicular product. The process has reasonable design, and can effectively improve the drying efficiency and product quality.

Description

technical field [0001] The invention relates to a drying process of sodium lauryl sulfate, which belongs to the technical field of preparation of surfactants in organic compounds. Background technique [0002] Sodium lauryl sulfate (trade name K 12 ), also known as sodium lauryl sulfate, is an anionic surfactant widely used at present. Because of its excellent decontamination, emulsification, foaming ability, non-toxic and good biodegradability, it is widely used in daily chemical industry, toothpaste, medicine, chemical industry, textile, electroplating, mineral processing and other fields. [0003] Industrially, sodium lauryl sulfate is made from lauryl alcohol through sulfation, neutralization, drying and other processes. The drying process can improve product stability and reduce packaging and transportation costs. However, due to sodium lauryl sulfate It is a heat-sensitive multi-foaming viscous substance. The drying conditions are very harsh. When the temperature is ...

AI Technical Summary

Problems solved by technology

[0003] Industrially, sodium lauryl sulfate is made from lauryl alcohol through sulfation, neutralization, drying and other processes. The drying process can improve product stability and reduce packaging and transportation costs. However, due to sodium lauryl sulfate It is a heat-sensitive multi-foaming viscous substance. The drying conditions are very harsh. When the temperature is too high, it is easy to decompose and the color will deepen. When the temperature is too low, the viscosity of the material is high and it is not easy to disperse.

Existing dry sodium lauryl sulfate usually adopts a spray drying process, which uses hot air as a drying medium, not only has low thermal efficiency, large equipment investment, serious exhaust dust pollution and loss, especially the sodium lauryl sulfate material at 100 It starts to decompose and coke within 4 hours under the temperature of ℃, so that yellow and black spots appear in the white powder, which seriously affects the product quality. The body is decomposed under high temperature conditions for a long time, so every 10 to 20 hours of driving, it is necessary to stop and wash the tower wall, which not only affects production efficiency, increases production consumption, but also produces a large amount of washing wastewater

Chinese patent CN1680303A discloses a spray drying process using a fluidized bed. Although the process reduces dust pollution, it does not fundamentally solve the problem of low thermal efficiency of spray drying, large equipment investment, easy decomposition of the product and deep color, and watery product after drying. Part content is still relatively high; U.S. Patent No. 5,723,433 uses vacuum drying to remove water in lauryl sulfuric acid. This process operates under vacuum, and the operating temperature is low. Heat-sensitive materials are not easy to decompose, but in order to achieve better drying results, A long vacuum drying tube is required, so that the material is easy to block the tube and affect the production efficiency

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