| 摘要 |
<p>Desulphurisation of a feedstock using a regenerable sorbent to give a desulphurised stream, regeneration of the sorbent by heating, followed by cooling. The cooling is effected by contacting the sorbent with the feedstock, and during at least the initial part of the cooling, at least part of the effluent from the sorbent is contacted with a non-regenerable particulate sorbent. The desired desulphurised product comprises the effluent from the particulate sorbent, together with any desulphurised effluent from the regenerable sorbent that has bypassed the particulate sorbent. Preferably the heat for regeneration is obtained by heat exchange with the product of combustion of the sulphur laden regeneration fluid. In an alternative process using a particulate sorbent for a "polishing" operation, the regenerable sorbent is replaced by a membrane separation unit giving a desulphurised stream and a sulphur laden stream, which is combusted to heat, by heat exchange, the desulphurised stream before it passes through the particulate sorbent.</p> |
