Sulphate navel stores are by-products of the following

Solution

Sulphate navel stores, also known as kraft lignin, are by-products of the kraft pulping process. The kraft pulping method is a widely used chemical pulping process in the paper and pulp industry. It involves the use of sodium hydroxide (NaOH) and sodium sulphide (Na2S) to break down wood fibers, resulting in the production of pulp for papermaking and the recovery of various by-products, including sulphate navel stores (kraft lignin).