In the production process of tobacco diacetate cellulose flakes (commonly known as "vinegar flakes"), the washing system/washer is a crucial unit equipment, whose function directly affects the chemical indicators, stability, odor, and downstream tow and filter rod quality of the product.

1. The position of the scrubber in the production process

The typical production process for cellulose acetate (CA) flakes used in tobacco is as follows:

Cellulose → acetylation → aging → hydrolysis (adjust DS) → washing → dehydration → drying → vinegar flakes

The scrubber is located after the completion of the acetylation reaction and hydrolysis adjustment, and it is a core part of the post-treatment process.

II. Main functions (core functions) of the scrubber

1. Remove residual acid and catalyst (the most crucial role)

The scrubber effectively removes through multi-stage water washing or countercurrent washing:

Residual sulfuric acid (H₂SO₄)

Residual acetic acid, acetic anhydride

Acidic substances generated from unreacted or side reactions

Meaning:

Prevent acid-catalyzed degradation of vinegar tablets in the later stage

Improve the thermal stability and storage stability of the product

Reduce corrosion to downstream solvent systems

2. Control and stabilize the acid value of the product

The scrubber is the decisive process for acid value control:

By adjusting:

Washing water temperature

Washing water consumption

Washing level

dwell time

Stabilize the acid value of vinegar tablets within the range required for tobacco use

3. Remove low molecular weight by-products and soluble impurities

Washing can effectively remove:

Low molecular weight cellulose acetate

Incompletely replaced small molecule cellulose

Soluble organic by-products

effect

Improve the uniformity of molecular weight distribution of vinegar flakes

Improve the formability of the tow

Reduce the risk of subsequent "dust" and "flying hair" issues

4. Improve odor and sensory quality (particularly important for tobacco products)

The scrubber is crucial for odor control:

Reduce the irritating odor caused by free acid

Reduce the "sour taste" and "pungent smell" in the downstream filter rod

Create a good foundation for subsequent aging and drying

This is a hidden quality aspect that the tobacco industry places great emphasis on, but which is not fully reflected in the physical and chemical indicators.

5. Create stable conditions for subsequent dehydration and drying

Adequate and uniform washing can:

Ensure uniform distribution of water and acid content in vinegar tablets

Avoid the following issues during the drying process:

caking

Localized overheating degradation

color abnormality

The core role of the washer in the production of diacetate cellulose flakes for cigarette use is:

Efficient acid removal, stable acid value, odor improvement, and material stability enhancement are the key processes that determine whether vinegar flakes truly meet the tobacco-grade standards.