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In the regeneration of dissolved cellulose (in a cuprammonium solution) in an acid bath, say sulphuric acid, what is the chemical reaction?

There is a lot about the chemistry of the production of the copper ammonia complex but nothing about the precipitation step.

Is the precipitation possible with any acid?

Apologies about the tag - can't find any existing ones that are appropriate

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It's possible to regenerate cellulose from Schweizer's reagent by dilution in plain water, though neutralization of the high pH+ cuprammonium solution with an acid is more efficient. $\ce{HCl}$ works as well as $\ce{H2SO4}$. Economics probably drives the choice.

The chemistry is based on breaking cellulose, a polysaccharide (polymer) β(1→4) linked D-glucose, into smaller, soluble, segments, and reconstituting the longer polysaccharide through neutralization.

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