A kind of drying equipment and drying method for powdery surfactant

Abstract

The invention discloses a drying device used for a powdery surfactant. The drying device comprises a homogenizing tank, a film scraping drying system, a platelike hopper, an air flow drying system, a grinding system, a turbulent flow drier and a powder cabin. The film scraping drying system comprises a film scraping evaporator, a tablet press, a hot water tank and a cold water tank. The air flow drying system comprise an air flow drying pipe and a cyclone separator. The grinding system comprises a grinding machine and a grinding separator. The discharge hatch of the turbulent flow drier is connected with the powder cabin. The device employs modes of combination of dry film scraping drying, air flow drying, grinding, turbulent flow drying and separation cooling to dry a powdery surfactant, required energy consumption is low, environment pollution is low, the product purity of the produced powdery surfactant reaches 98-99.5%, the granularity is fine, granules are uniform and stable, the micropowder content is high, and caking is not easy.

Description

technical field [0001] The invention belongs to the technical field of material drying, and in particular relates to a drying equipment for powdery surfactants and a drying method thereof. Background technique [0002] Powdered surfactants such as fatty alcohol sulfate sodium salt (K12), α-alkenyl sulfonate sodium salt (AOS), alkylbenzene sulfonate sodium salt (LAS), alkyl polyglycosides (APG), fatty acid methyl ester sulfonate The production of sodium phosphate (MES), etc., mainly has various problems such as heat-sensitive and easy to decompose products, high dust, short production cycle, uneven powder particles, product agglomeration, inconvenient use, and low product purity. [0003] There are three commonly used solutions at present: the first is the spray drying method, in which drying and molding are completed in one step, and the product is directly packaged after being cooled by airflow, with simple operation, less dust, good particle uniformity, and is not easy to ...

AI Technical Summary

Problems solved by technology

[0002] Powdered surfactants such as fatty alcohol sulfate sodium salt (K12), α-alkenyl sulfonate sodium salt (AOS), alkylbenzene sulfonate sodium salt (LAS), alkyl polyglycosides (APG), fatty acid methyl ester sulfonate The production of sodium bicarbonate (MES), etc., mainly has various problems such as heat-sensitive and easy to decompose products, a lot of dust, short production cycle, uneven powder particles, product agglomeration, inconvenient use, and low product purity.

[0003] There are three commonly used solutions at present: the first is the spray drying method, in which drying and molding are completed in one step, and the product is directly packaged after being cooled by airflow, with simple operation, less dust, good particle uniformity, and is not easy to agglomerate , but due to the high temperature required for drying, the energy consumption is high, the waste gas is large, and the output is not large, and the part adhering to the tower wall is easy to decompose, forming black spots, and the cycle is short. , a lot of sewage, easy to pollute the environment, the water content of the product is generally 1-3%, and the active substance is 90-97%;

[0004] The second is the vacuum tube drying-milling method, which is divided into two steps of drying and grinding. The tube dryer is a non-powered device, and the heat source uses steam, which has high efficiency and is completed under vacuum, and the energy consumption is very low. The product after vacuum drying is extruded into a needle shape by an extruder and then cooled by a steel belt. The drying effect is better, but the hardness is relatively high, and it is difficult to grind by a mill. The powder is solid and easy to agglomerate, and the used The structure of the dryer is complicated, and it is very inconvenient to clean. The water content of the product is generally 2-5%, and the active substance is 90-95%;

[0005] The third is the scraping film drying-milling method. This method is also divided into two steps of drying and milling. The micro-negative pressure operation uses steam as the heat source, and the energy consumption is very low. After the product is scraped and dried, it is cooled and pressed into a sheet shape before grinding. Powder, the operation is relatively simple, but due to the short cooling residence time of the tablet machine, the cooling effect is affected by the water content, the uniformity of the particles after grinding is not high, and it is easy to agglomerate, the water content of the product is generally 2-5%, and the active substance is 90% -95%

[0006] However, the above methods still cannot solve these problems well.

Images