Sodium 2-anthraquinonesulfonate (AMS) is a water-soluble

anthraquinone Anthraquinone, also called anthracenedione or dioxoanthracene, is an aromatic hydrocarbon, aromatic organic compound with formula . Several isomers exist but these terms usually refer to 9,10-anthraquinone (IUPAC: 9,10-dioxoanthracene) wherein th ...

derivative. In the laboratory it can be prepared by sulfonation of anthraquinone.

Digester additive in papermaking

AMS is used as a catalyst in the production of alkaline pulping in the soda process. It goes through a redox cycle similar to that of

to give a catalytic effect. AMS was discovered as an efficient pulping catalyst before anthraquinone, but has a higher cost.

References

{{reflist Anthraquinones Sulfonates Organic sodium salts