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In unification models based on SU(15) or SU(16), baryon number is part of thegauge symmetry, broken spontaneously. In such models, we discuss variousscenarios of important baryon number violating processes like proton decay andneutron-antineutron oscillation. Our analysis depends on the effective operatormethod, and covers many variations of symmetry breaking, including differentintermediate groups and different Higgs boson content. We discuss processesmediated by gauge bosons and Higgs bosons parallely. We show how accidentalglobal or discrete symmetries present in the full gauge invariant Lagrangianrestrict baryon number violating processes in these models. In all cases, wefind that baryon number violating interactions are sufficiently suppressed toallow grand unification at energies much lower than the usual $10^{16}$ GeV.Comment: (32 pages LATEX) [DOE-ER\,40757-022, CPP-93-22] {Small changes made  and two references added. This version will appear in Phys. Rev. D

Proton decay and related processes models with gauged baryon number