| 摘要 |
<p>The invention provides a process for the preparation of an olefinic product, the process comprising the steps of:•(a) reacting an oxygenate feedstock, comprising oxygenate, in an oxygenate reaction zone in the presence of a catalyst comprising a molecular sieve, at a temperature in the range of from 350 to 1000°C, to produce a reaction effluent stream, comprising at least oxygenate, olefin, water and acidic by-products;•(b) optionally cooling the reaction effluent stream by means of an indirect heat exchange to a temperature greater than the dew point temperature of reaction effluent stream;•(c) further rapidly cooling the reaction effluent stream to a temperature at or lower than the dew point temperature of the reaction effluent stream by direct injection of a first aqueous liquid into the reaction effluent stream, to form a quench effluent stream;•(d) separating the first quench effluent stream into a liquid quench stream and a gaseous quench stream; and passing the gaseous quench stream into a quench tower and contacting the gaseous quench stream with a second aqueous liquid in the presence of at least one set of quench tower internals, to produce a quench tower gaseous stream comprising the olefinic product.</p> |
