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[Chemical Knowledge]：The manufacturing method and process of Lyocell.

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Lyocell (Lyocell) is a kind of regenerated cellulose fiber with excellent properties, such as high strength, high moisture absorption, air permeability and biodegradability. In the field of raw materials for chemical production, the manufacturing method of lyocell has attracted much attention. This article will introduce the manufacturing method of lyocell in detail, including pulp preparation, solvent preparation, spinning and post-treatment.

1. pulp preparation

lyocell pulp preparation mainly uses chemical pulp method, that is, wood, cotton linters and other raw materials, after chemical treatment will be converted into cellulose pulp. The specific steps are as follows:

1. raw material preparation: choose soft texture, high cellulose containing wood or cotton linters as raw materials.
2. Chemical treatment: the raw materials are mixed with chemical agents for chemical reaction to remove impurities and obtain cellulose pulp.
3. Washing and pressing: Wash the pulp with clear water to remove residual chemicals, and then press to obtain pulp with lower water content.

2. Solvent Preparation
Solvent preparation of
lyocell mainly used N-methylmorpholine-N-oxide (NMMO) aqueous solution. The specific steps are as follows:

1. ingredients: NMMO and water are mixed according to a certain proportion to prepare a certain concentration of NMMO aqueous solution.
2. impurity removal: by distillation, filtration and other methods to remove impurities in the solution, to ensure the purity of the solvent.

3. spinning

spinning is a key step in the manufacturing process of Lyocell, which mainly includes the following links:

1. Pulp dissolution: The pulp is added to the NMMO aqueous solution, heated and stirred to fully dissolve the pulp to form a spinning solution.
2. Filtration and defoaming: Filtering the spinning dope to remove impurities and bubbles.
3. Spinning: The spinning dope is extruded through a spinneret to form a filament.
4. Stretching and Coagulation: The fiber filaments are stretched while being coagulated with a coagulation bath.

4. post-treatment

post-treatment mainly includes washing, drying, oiling, winding and other processes to obtain the finished lyocell fiber. The specific steps are as follows:

1. water washing: the solidified fiber is washed with clear water to remove the residual solvent and impurities.
2. Drying: The water-washed fiber is dried to reduce its water content to a certain range.
3. Oiling: oiling the dried fiber filaments to increase their smoothness and flexibility.
4. winding: winding the oiled fiber yarn into a tube to obtain the finished lyocell fiber.

above is the manufacturing method of lyocell, through pulp preparation, solvent preparation, spinning and post-processing processes, can produce high-quality lyocell fiber. In the actual production process, it is necessary to strictly control the process parameters of each process to ensure product quality and output. At the same time, in order to reduce production costs and improve production efficiency, it is necessary to continuously optimize production processes and equipment, and improve the level of automation and intelligence.

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