DETERGENT FOR KRAFT PULP AND PROCESS FOR PRODUCING KRAFT PULP WITH THE SAME

摘要

A detergent for Kraft pulp, containing a nonionic surfactant containing at least one compound expressed by any of the following general formulae 1 to 3:        R1O-(PO)n-[(EO)m·(PO)k]H     General Formula 1        R2-CO-(AO)y-OR3     General Formula 2wherein the detergent is used for washing a raw material of pulp after decomposing a lignin substance contained in the cooked raw material of pulp using oxygen, and wherein the nonionic surfactant has a clouding point lower than a washing temperature during washing of the raw material of pulp.