Methanol plant uses low pressure methane from the cracking unit of ethylene plant as the raw material. There have been times when the olefin content of the raw material was high, affecting the safe and stable operation of the methanol plant. After replacing the desulfurizer in the desulfurization tank of methanol plant by desulfurizer B with hydrogenation capacity, the pressure difference gradually increased. Through field verification and practical operation, low temperature hydrogenation technology was used to effectively solve the bottleneck problem of pressure difference increase in the desulfurization tank.