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1. WO2012068336 - BACK-UP CONFIGURATIONS AND METHODS FOR SULFURIC ACID PLANTS

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[ EN ]


AMENDED CLAIMS received by the International Bureau on 29 May 2012 What is claimed i A method of sulfur removal from a sulfuric acid plant feed gas or sulfuric acid plant off wherein the feed gas or offgas is provided at a first flow rate to or from the sulfuric acid the method using a sensor or process schedule to determine that a component of the sulfuric acid plant is or scheduled for diverting at least a portion of the feed gas or the offgas to a absorber that is operated in a discontinuous manner with respect to continuous operation of the sulfuric acid contacting the at least portion of the feed gas or the offgas with a lean solvent in the absorber to thereby form a rich wherein the lean solvent is provided from a lean solvent storage and wherein the lean solvent storage tank has a capacity sufficient to allow continuous operation of the absorber at the first feed rate for at least two The method of claim 1 further comprising a step of storing the rich solvent from the absorber in a rich solvent storage The method of claim 1 further comprising a step of regenerating the rich solvent from the absorber in a The method of claim 3 wherein the regenerator is operated using waste heat from a component of the sulfuric acid The method of claim 3 wherein the regenerator is operated a time when the absorber docs not The method of claim 3 wherein the regenerator is a regenerator of a primary sulfur removal unit of the sulfuric acid The method of claim 3 wherein the regenerator produces a regenerator overhead that is recycled to a location in the sul furic acid A method of sulfur removal from a sul furic acid plant feed gas providing a sulfuric acid plant feed gas at a first feed rate to a sulfuric acid diverting at least a portion of the feed gas to a absorber that is operated in a discontinuous manner with respect to continuous operation of the sulfuric acid and contacting the at least portion of the feed gas with a lean solvent in the absorber to thereby produce a rich wherein the lean solvent is provided from a lean solvent storage and wherein the lean solvent storage tank has a capacity sufficient to allow continuous operation of the absorber at the first feed rate for at least two The method of claim 8 further comprising a step of storing the rich solvent from the absorber in a rich solvent storage The method of claim 8 further comprising a step of regenerating the rich solvent from the absorber in a 1 The method of claim 1 0 wherein the regenerator is operated using waste heat from a component of the sulfuric acid The method of claim 10 wherein the regenerator is operated at a time when the up absorber docs not The method of claim 1 0 wherein the regenerator is a regenerator of a primary sulfur removal unit o f the sulfuric acid A sulfur removal system for a sul furic acid a absorber fluidly coupled to 1 a component of a sul furic acid plant that is configured to provide an acid gas to a primary absorber or a sulfuric acid plant feed gas wherein the primary absorber is configured to produce an offgas at a first flow and wherein the sulfuric acid plant feed gas source is configured to produce a feed gas at a second a lean sol vent storage container fluidly coupled to the a control system that is configured to allow determination that the primary absorber is or shut wherein the control system is further configured to allow for discontinuous operation of the absorber upon determination that the primary absorber is or shut and wherein the absorber and lean solvent storage container are configured to allow for continuous operation of the absorber at the first or second feed rate for at least two hours to thereby produce a rich solvent while the primary absorber is or shut 1 The system of claim 14 further comprising a rich solvent storage container that is fluidly coupled to the absorber to receive and store the rich The system of claim 14 further comprising a regenerator that is fluidly coupled to at least one of the absorber and a rich solvent storage container that is fluidly coupled to the and wherein the regenerator is further configured to produce a lean solvent from the rich The system of claim 15 wherein the regenerator is configured to use waste heat from a component of the sulfuric acid The system of claim 14 wherein at least one of the lean solvent storage container and the regenerator is configured for use of a primary sulfur removal system of the sulfuric acid The method of claim 14 wherein the control system is further configured to allow for automatic of the absorber upon determination that the primary absorber is or shut The method of claim 14 wherein the absorber and lean solvent storage container are configured to allow for continuous operation of the absorber at the first or second feed rate for at least 10 insufficientOCRQuality